CN205415928U - A wood thermal modification treatment equipment - Google Patents

Abstract

The utility model discloses a thermal modification treatment device for wood, which comprises a gasification combustion device, a heat exchange device, a thermal modification device, a volatile organic compound collection device and a fan system which are sequentially connected through a connecting pipeline. The processing equipment provides the heat generated by the gasification combustion device to the thermal modification device under the action of the fan system, performs thermal modification treatment on the wood, and collects the VOC generated by the thermal modification treatment of the wood. The treatment equipment of the utility model has simple structure and high thermal efficiency. It uses agricultural and forestry wastes, residues, wood processing residues and other plant-derived biomass as fuel, and uses gasification reverse combustion/normal combustion and high-efficiency heat exchange for thermal modification of wood. Provide a heat source, on the premise of ensuring the quality of high-temperature heat-modified wood, significantly reduce equipment investment costs and operating costs, and avoid the emission of volatile organic compounds and heat pollution during the wood heat-modified process.

Description

A wood thermal modification treatment equipment

technical field

The utility model relates to a wood thermal modification treatment equipment, in particular to a wood thermal modification treatment equipment which utilizes wood processing residues, agricultural and forestry wastes, residues and other plant-sourced biomass as fuel to provide a heat source for back-burning, and belongs to The field of wood processing technology.

Background technique

With the implementation of the national natural forest protection project, the efficient and value-added utilization of artificial fast-growing forests has gradually become the focus of research and attention of domestic scientific research institutions and production enterprises. Over the years, people have attempted to modify fast-growing wood through chemical methods, and have achieved certain results. However, how to eliminate the harm to human body and environment during the preparation and use of chemically treated wood, and whether the chemically treated wood products can be accepted by people is a problem that needs to be solved first. Therefore, the thermal modification technology based on the physical modification method is still the most practical, economical and environmentally friendly modification method among various wood modification methods. Due to its good biological durability, weather resistance, dimensional stability, safety, environmental protection and other outstanding advantages, thermally modified wood is increasingly widely used, especially in outdoor wooden construction and decoration.

At present, the conventional wood high-temperature thermal modification process is to place the wood under the protection of water vapor, and carry out the heat treatment temperature between 180 ° C and 220 ° C. Such a high heat treatment temperature uses saturated water vapor under high pressure as heat. media is unrealistic. Therefore, industrial wood high-temperature thermal modification equipment usually uses heat transfer oil (oil temperature is usually greater than 240°C) as the heating medium. In this way, in terms of equipment investment, in addition to considering the investment in the heat treatment equipment itself, it is also necessary to increase heat conduction. Investment in ancillary equipment such as oil heating systems, steam boilers or steam generators. In some cases, the total investment of ancillary equipment may even exceed the investment of the heat treatment equipment itself, and its operating cost is also high, which in turn will lead to a substantial increase in the cost of heat-treated wood.

Chinese Patent Document No. CN101745951A disclosed a modified plantation wood and a preparation method thereof on June 23, 2010. The invention discloses an artificial forest wood impregnation enhancement-heat treatment modification technology. The steps are as follows: ① impregnate the wood with an impregnating solution using modified urea-formaldehyde resin as the main impregnating agent; ② perform vacuum heat treatment on the impregnated wood. The wood prepared by the method of the invention has high dimensional stability, high wood strength, increased swelling resistance and corrosion resistance, increases the added value of the wood, and expands the application range of the heat-treated wood. However, although the dimensional stability of the wood treated by chemical methods has been improved, because the wood contains chemical agents, the treated wood will pollute the environment and be harmful to the human body no matter when it is used or when it is disposed of as waste.

Chinese Patent Document No. CN101491908A disclosed a high-temperature wood heat treatment equipment and process method on July 9, 2009. The wood processing residues are used as fuel, and the heat treatment circulation medium is used for a one-time process through a reverse combustion and heat exchange integrated hot blast furnace. Heat exchange, high thermal efficiency, full combustion, no pollution. However, the function of the back-burning furnace is single, which can only realize the back-burning operation, and cannot meet the process requirements of different temperature stages. The cooling problem is not considered at the grate, the life of the grate is low, the maintenance workload is large, and the thermal power of the integrated furnace is small. It cannot meet the requirements of industrial production; there is only a single air inlet and outlet pipe inside the chamber, resulting in uneven temperature and humidity field inside the treatment chamber, and the treatment quality is not high; the whole set of equipment lacks a collection device for volatile organic compounds, resulting in VOC emissions and thermal pollution are serious.

The purpose of this utility model is to propose an environment-friendly wood thermal modification equipment and a treatment method for improving uniformity. The fuel can achieve the required process conditions through gasification and back-burning and efficient heat exchange, without the need for additional steam heat sources and the heat conduction oil furnace system necessary for traditional high-temperature thermal modification, which can significantly improve the quality of high-temperature heat-treated wood Reduce equipment investment cost and operating cost, and avoid the emission of volatile organic compounds and thermal pollution during the thermal modification of wood.

Utility model content

The purpose of the utility model is to provide a kind of wood thermal modification treatment equipment aiming at the technical problems existing in the wood thermal modification treatment process of the existing wood thermal modification treatment equipment. The thermal modification equipment of the utility model has a simple structure, uses plant-derived biomass such as crop stalks, garden waste, and wood processing residues as fuel, and realizes the required process conditions through gasification back-burning and efficient heat exchange without additional The steam heat source and the heat conduction oil furnace system necessary for traditional high-temperature thermal modification can significantly reduce equipment investment and operating costs while ensuring the quality of high-temperature heat-treated wood, and avoid the emission of volatile organic compounds during the thermal modification of wood and heat pollution.

In order to achieve the purpose of the utility model, the utility model provides a wood thermal modification treatment equipment on the one hand, including a gasification combustion device, a heat exchange device, a thermal modification device, a volatile organic compound (VOC) The collection device and the fan system connected to the heat exchange device, wherein:

The gasification combustion device includes a reverse burning gasifier, a hot flue gas channel, a normal burning flue gas channel and a grate assembly located in the gasifier, wherein: the hot flue gas channel is located in the gasifier The outside of the rear side wall is integrally connected with the gasifier body and communicates with the gasifier; the normal combustion flue gas channel is arranged outside the left and right side walls of the gasifier The furnace body is integrally connected and communicated with the gasifier; the grate assembly is fixed in the middle of the gasifier to divide the gasifier into upper and lower combustion chambers;

The thermal reforming device includes a shell, a heat treatment chamber, an air inlet pipe, a return air pipe, and a reformed flue gas outlet, wherein the shell is in the shape of a cuboid or a cube as a whole, and an openable and closable seal is provided on the front side. The door is closed at the rear side; the heat treatment chamber inside the housing is a cavity with a rectangular cross-section; the air inlet pipe is fixed on the upper part of the heat treatment chamber and is placed horizontally along the front side wall of the housing near the front side wall; The return air duct is arranged inside the heat treatment chamber, placed close to the rear side wall of the housing and placed horizontally along the rear side wall of the housing; The flue gas is discharged from the thermal reforming device.

Among them, the counter-firing gasifier includes a furnace body, a furnace liner, a flue gas outlet, and a fire grate assembly. The furnace body is in the shape of a cuboid or cube as a whole; The combustion chamber; the grate assembly is fixed in the middle of the furnace, and the furnace is divided into an upper combustion chamber and a lower combustion chamber; the flue gas outlet is arranged on the rear side wall of the lower combustion chamber.

In particular, the inner wall of the furnace body is made of refractory material, and the outer wall is made of heat-insulating material, which not only prolongs the service life of the furnace body, but also reduces heat exchange between the furnace body and the environment, reduces heat loss, and improves thermal efficiency.

In particular, the upper middle part of the front side wall of the furnace body is equipped with an upper furnace door; the lower middle part is provided with a lower furnace door for real-time observation of the combustion status of the fuel in the furnace and oxygen supply to the upper and lower combustion chambers.

Wherein, the flue gas outlet is arranged on the rear side wall of the lower combustion chamber of the gasification furnace body, penetrates through the rear side wall, and communicates with the hot flue gas channel. The hot flue gas generated by the combustion of the gasifier is discharged through the hot flue gas channel.

Wherein, the bottom of the furnace body is closed, and the top is provided with a feeding port and a top cover for closing the feeding port.

In particular, the setting position of the charging port corresponds to the furnace liner, that is, the center of the charging port is adapted to the axis of the furnace liner, which is beneficial for fuel to fall into the furnace liner.

Wherein, the middle and lower parts of the left and right side walls of the furnace body are respectively provided with left and right auxiliary oxygen inlets, and the left and right auxiliary oxygen inlets are respectively connected with two left , The right auxiliary oxygen inlet pipe is connected, and the air or oxygen outside the furnace is introduced into the inside of the furnace to provide oxygen for the fuel combustion in the furnace.

In particular, auxiliary oxygen inlet valves are respectively provided in the pipes extending outside the gasifier to adjust the opening and closing or opening degree of the auxiliary oxygen inlet valves, adjust the oxygen intake, and improve fuel combustion efficiency.

In particular, the location of the auxiliary oxygen inlet is located at the same level as the flue gas outlet opened at the lower part of the rear side wall of the furnace body. It is beneficial to reduce the resistance of the hot flue gas flowing into the hot flue gas channel, reduce the resistance of the fan, and improve the heat exchange efficiency.

In particular, the axes of the left and right side auxiliary oxygen inlets are located at the same level as the axes of the flue gas outlets in the lower part of the rear side wall of the furnace body.

In particular, the auxiliary oxygen inlet pipes are respectively connected with the flue gas passages of the burning flue gas, and send the hot flue gas entering the flue gas passages into the lower combustion chamber, and then pass through the flue gas outlet. Enter the hot flue gas channel, and then exit the gasification and backburning device.

Wherein, the upper parts of the left and right side walls of the furnace body are provided with left and right normal-firing flue openings respectively, and the left and right normal-firing flue openings are respectively connected with the left and right normal-firing flue gas passages for When the gasifier is in the state of normal combustion, the hot flue gas generated by combustion is exported from the upper combustion chamber, flows into the normal combustion flue gas channel, and then flows into the lower combustion chamber, and is discharged into the hot flue gas channel through the flue gas outlet Exit the gasifier.

In particular, the normal combustion flue gas channel is located between the normal combustion flue opening and the auxiliary oxygen inlet, and communicates the normal combustion flue opening with the auxiliary oxygen inlet.

Wherein, a normal firing flue valve is provided in the opening of the normal firing flue. The normal combustion flue valve is opened, and the fuel is burned in the gasifier in the normal combustion mode; the normal combustion flue valve is closed, and the fuel is burned in the gasifier in the reverse combustion mode. That is, when the valve of the normal combustion flue is opened, the normal combustion flue mouth, the normal combustion flue gas passage, the auxiliary oxygen inlet pipe, and the auxiliary oxygen inlet are connected, and the hot flue gas generated by the normal combustion in the furnace passes through the normal combustion flue mouth, the normal combustion The flue gas channel, auxiliary oxygen inlet pipe, and auxiliary oxygen inlet port are fed into the lower combustion chamber of the gasification counter-burning furnace, and then discharged through the flue gas outlet; A hot flue gas flow channel is formed, and the gasification reverse combustion furnace performs reverse combustion.

In particular, the auxiliary oxygen inlet pipe is located at the bottom of the normal combustion flue gas channel and communicates with the normal combustion flue gas channel. The hot flue gas entering the flue gas passage is sent into the lower combustion chamber, and then discharged through the flue gas outlet.

In particular, the auxiliary oxygen inlet pipe is arranged horizontally; the flue gas channel for normal combustion is arranged vertically.

Wherein, the grate assembly includes a flat grate main body and upper and lower steel pipes located at the upper and lower ends of the grate main body, wherein the grate main body is composed of a plurality of steel pipes arranged in parallel at intervals, and two adjacent There is a certain distance between the steel pipes; the upper and lower steel pipes are integrally connected with the steel pipes of the grate main body, and communicate with each other at the joints to form a water flow channel.

In particular, the steel pipe of the grate main body is welded together with the upper and lower steel pipes, and communicates with each other at the welding place to form an internal water flow channel.

In particular, the distance between two adjacent steel pipes of the grate main body is 4-10mm.

In particular, the grate main body is composed of 2-5 steel pipes arranged in parallel, preferably 3-4 steel pipes.

Wherein, the grate assembly includes a grate main body and upper and lower steel pipes located at both ends of the grate main body. The grate main body is in the shape of a flat plate as a whole and is composed of a plurality of steel pipes, which are spaced from each other and arranged in parallel; the upper steel pipes, The lower steel pipe is welded together with the grate main steel pipe along the axial direction perpendicular to the grate main steel pipe, and the upper and lower steel pipes communicate with the grate main steel pipe at the weld to form an internal channel for cooling water to flow. Cooling water flows in from the lower steel pipe, flows out from the upper steel pipe after passing through the main steel pipe of the grate.

In particular, the axes of the upper steel pipe and the lower steel pipe are perpendicular to the axes of the steel pipes forming the main body of the grate.

Wherein, a layer of refractory layer composed of refractory material is attached to the outer surface of the steel pipe constituting the main body of the grate.

In particular, the thickness of the refractory layer is ≥10mm. The refractory layer can not only prevent the steel pipe from being burned out, extend the practical life of the steel pipe, and facilitate the smooth progress of the gasification and backburning process, but also can pass cooling into the steel pipe of the grate according to the temperature in the furnace and the surface temperature of the steel pipe (up to 900°C or more). Water, to cool the grate, reduce the temperature of the grate surface, and further prolong the life of the grate. In the early stage of gasification and anti-burning, because the temperature in the furnace is not very high, it is not suitable to open the cooling water. In the later stage of treatment, the temperature in the furnace is too high When it affects the practical life of the steel pipe, the condensed water can play a role in cooling and protecting the grate, and when the cooling water is introduced to cool and protect the grate, the condensed water inside the grate absorbs heat, Part of the moisture can be turned into water vapor, so that the steam generated in the steel pipe of the grate can be passed into the subsequent equipment that needs water vapor treatment (for example, the interior of the wood thermal modification device can heat and adjust the humidity of the wood) to achieve Energy recycling to improve energy efficiency.

Wherein, the upper steel pipe is arranged in the rear side wall of the furnace body and placed horizontally along the rear side wall; the lower steel pipe is arranged in the front side wall of the furnace body and placed horizontally along the front side wall.

In particular, one end of the upper and lower steel pipes is closed, the other end is open, the closed end is arranged on the right side wall or the left side wall of the furnace body, and the open end passes out from the left side wall or the right side wall of the furnace body, and Extending to the outside of the left side wall or the right side wall, it is connected with the cooling water pipe, and the cooling water is introduced into the fire grate assembly in the furnace to cool down the temperature of the fire grate assembly.

Wherein, the grate assembly is obliquely placed in the furnace, and the inclination angle is 0-10°, preferably 5°. It is conducive to the automatic upward movement of the steam generated in the grate and the removal of moisture inside the grate in the later stage.

In particular, the lower steel pipe is arranged in the middle or lower than the middle of the front side wall of the furnace body; the upper steel pipe is arranged in the middle or upper middle of the rear side wall of the furnace body.

In particular, the hot flue gas channel is connected to the heat exchange device through a pipe.

Wherein, the heat exchange device includes a heat exchange body, a heat exchange chamber in which a plurality of heat exchange tubes are installed inside the body, a hot flue gas inlet pipe installed at the lower part of the body, and a thermally modified medium introduction pipe; the heat exchange chamber installed at the upper part of the body Flue gas outlet pipe and thermally modified medium outlet pipe.

In particular, the body is made of heat-insulating material and is cylindrical as a whole, with a cavity inside to form a heat exchange area; the upper and lower ends of the body are closed.

Wherein, the hot flue gas inlet pipe is connected to the hot flue gas channel of the gasification combustion device through a connecting pipe; the hot flue gas outlet pipe is connected to the exhaust fan through a connecting pipe; the hot flue gas The air inlet pipe and the hot flue gas outlet pipe are connected with the heat exchange chamber of the heat exchange device, and a large amount of hot flue gas generated by the gasification combustion device is introduced into the heat exchange chamber of the heat exchange device for heat exchange; The thermal modification medium inlet pipe and the thermal modification medium outlet pipe are respectively connected to the thermal modification device through connecting pipes.

In particular, the heat reforming medium inlet pipe is connected to the return air pipe of the heat reforming device through a connecting pipe; the heat reforming medium outlet pipe is connected to the air inlet pipe of the heat reforming device through a connecting pipe connected.

In particular, the heat exchange device is a shell-and-tube heat exchanger.

In particular, the bottoms of the plurality of heat exchange tubes communicate with the heat-modifying medium inlet pipe through flanges; the tops communicate with the heat-modifying medium outlet pipe through flanges.

Under the action of the smoke exhaust fan, the hot flue gas generated by the gasification combustion device enters the heat exchange cavity area from the air inlet pipe at the lower end of the heat exchange body, flows through the heat exchange tubes, transfers heat to the heat exchange tubes, and then Driven by the smoke exhaust fan, the hot smoke flows out from the air outlet pipe located at the upper end of the body. Driven by the heating fan, the thermal modification treatment medium to be heated enters the heat exchange tube in the heat exchange cavity area from the thermal modification medium introduction pipe at the lower end of the body, absorbs the heat of the hot flue gas, and flows from the upper end of the body The outlet pipe of the thermally modified medium flows out of the heat exchange device and enters the heat treatment device.

In particular, one end of the air inlet pipe of the thermal modification device is closed, and the other end is connected to the thermal modification medium outlet pipe of the heat exchange device through a connecting pipe, so that the heat treatment medium that has absorbed the heat source after the heat exchange treatment is introduced into the heat treatment medium. device.

Wherein, the length of the air inlet pipe located in the heat treatment chamber matches the length of the front side wall of the heat treatment chamber; the air inlet pipe is located on the surface of the pipe inside the heat treatment chamber and a plurality of air inlet nozzles are fixedly installed.

In particular, the air inlet nozzles are uniformly distributed on the surface of the air inlet pipe, and the air inlet nozzles are directed toward the pile of materials to be heat-treated, spray heat treatment medium to the pile of materials, and heat the pile of materials.

Wherein, the number of the return air ducts is ≥ 1, preferably 3;

In particular, one end of the air return pipe is closed and located in the heat treatment chamber, the other end passes through the left side wall or the right side wall of the casing, protrudes outside the casing, and is connected with the heat exchange device through a connecting pipe, and the modified The treatment medium after permanent treatment is introduced into the heat exchange device.

In particular, a return air valve is provided at the end of the return air pipe extending outside the shell; by adjusting the opening and closing or opening degree of the return air valve, the flow of the heat treatment medium in the heat treatment chamber is controlled, thereby controlling the flow of the heat treatment medium during the heat modification process. Uniformity of temperature throughout the heat treatment chamber.

Wherein, there are at least 3 return air ducts, which are arranged horizontally from top to bottom along the rear side wall of the shell, and the installation height of the 3 return air ducts matches the height of the upper, middle, and lower parts of the material pile to be modified. , that is, the upper, middle and lower return ducts.

In particular, the return air pipe is placed close to and horizontally along the rear side wall of the casing, and the three return air pipes are horizontally arranged from top to bottom along the horizontal direction of the rear side wall of the casing.

In particular, return air valves (preferably electric valves) are respectively arranged in the three return air ducts adapted to the heights of the upper, middle, and lower parts of the material pile, and the air entering the return air ducts is controlled by the opening and closing or opening degree of the return air valves. The flow rate of the thermal modification medium is used to realize the regulation and control of the uniformity of the wood treatment temperature during the thermal modification of wood.

In particular, the installation heights of the three return air ducts are adapted to the positions of the upper, middle and lower parts of the rear side wall of the casing.

In particular, the return air pipes placed horizontally along the rear side wall of the casing are divided into upper, middle and lower groups in order from top to bottom, that is, the upper return air pipe group of the thermal modification treatment chamber, the middle return air pipe group, and the middle return air pipe group. Pipe group, down return air pipe group.

Wherein, each return air duct group is composed of at least one return air duct.

In particular, the heights of the upper, middle and lower return air pipe groups match the heights of the upper, middle and lower parts of the material stack to be modified.

Wherein, the length of the return air pipe located in the heat treatment chamber matches the length of the horizontal direction of the rear side wall of the heat treatment chamber; and a plurality of return air outlets evenly distributed are arranged on the surface of the return air pipe. Collect the medium after heat treatment of the material pile, so that the heat treatment medium can pass through the material pile evenly and flow into the return air pipe evenly, so that the thermally modified medium can be evenly distributed to achieve the uniformity of heat treatment of the material pile.

Wherein, a return air valve is provided at the end of the return air pipe extending outside the shell; by adjusting the opening and closing or opening degree of the return air valve, the flow of the heat treatment medium in the heat treatment chamber is controlled, so as to achieve the uniformity of the temperature in the heat treatment chamber.

In particular, the 3 return air pipes/groups extending outside the housing are connected to the heat medium outlet main pipe, and then connected to the heat exchange device.

Wherein, the shell of the thermal reforming device is made of thermal insulation material, and the whole is in the shape of a cuboid or a cube.

In particular, the air inlet pipe is connected to the thermally modified medium outlet pipe of the heat exchange device through a connecting pipe; the return air pipe is connected to the heat modified medium inlet pipe of the heat exchange device through a connecting pipe .

After the heat exchange treatment of the heat exchange device, the heat treatment medium that has absorbed heat flows out from the thermal modification medium outlet pipe, enters the heat treatment chamber through the air inlet pipe, and then sprays the heat treatment medium evenly to the material pile to be heat modified through the air inlet nozzle. , the heat treatment medium passes through and heats the wood, and under the action of the heating fan, it is collected through the return air outlet on the return air duct, enters the return air duct, and enters the heat exchange device from the heat-modified medium inlet pipe of the heat exchange device to carry out Heat exchange, re-absorb heat source, form a heat treatment medium that has absorbed heat, and circulate into the heat reforming device.

Wherein, the modified flue gas outlet is arranged on the upper part of the rear side wall of the housing, and is used to discharge the hot flue gas generated during the wood thermal modification process out of the heat treatment chamber.

In particular, the modified flue gas outlet is connected to the VOC collection device, and the hot flue gas generated during the wood thermal modification process is discharged from the heat treatment chamber and then introduced into the VOC collection device.

In particular, a temperature sensor for measuring the temperature of the wood during the modification process is also included.

In particular, the temperature sensors are respectively arranged at the upper, middle and lower parts of the material pile to be modified.

In particular, the temperature sensor is arranged on the plane of the incoming and outgoing material piles and the central plane of the material piles parallel to the rear side wall of the housing, and is arranged from top to bottom to measure the upper and lower sides of the material piles respectively. The temperature of the middle and lower parts, that is, three sets of temperature sensors are respectively arranged from top to bottom on the plane of the incoming and outgoing stockpile and the central surface of the stockpile parallel to the rear side wall of the shell (that is, in the middle of the stockpile From top to bottom, set a set of temperature sensors in the upper, middle, and lower parts of the pile, respectively, to measure the thermal modification temperatures T ₁ , T ₂ of the wood in the upper, middle, and lower parts of the pile during the thermal modification process. , T ₃ ).

In particular, it also includes an automatic or manual control system for controlling the opening and closing or opening degree of the return air valve to adjust the return air speed of the modified medium in the modification treatment device, wherein the automatic control system includes a control box.

In particular, the control box of the automatic control system is connected with the temperature sensor and the electric return air valve through a circuit, and by measuring the temperature of the upper, middle and lower parts of the pile, the opening and closing or opening degree of the electric return air valve is adjusted, and the heat treatment medium is adjusted. Adjust the flow rate of the heat treatment chamber to adjust the uniformity of the heat treatment temperature.

By controlling the opening degree of the return air valve installed on the return air pipe of the thermal modification device, the regulation and control of the uniformity of the wood treatment temperature during the wood thermal modification process is realized; by controlling the opening or closing of the heating fan, the Heat is supplied to the heat treatment chamber for heat modification treatment.

Wherein, the volatile organic compound (VOC) collection device includes a water tank containing VOC absorption liquid, at least one VOC washing pipeline, at least one circulating water pump and multiple connecting water pipes, wherein: the VOC washing pipeline is erected at the bottom of the water tank In the upper part, one end of the VOC washing pipeline is submerged under the liquid level of the VOC absorbing liquid contained in the water tank to form a closed channel for VOC absorption; The liquid is pumped to only VOC in the water washing pipeline to absorb VOC.

In particular, the water tank is used to place the absorbing liquid for absorbing VOC; the VOC washing pipeline is used to spray the VOC absorbing liquid to the gas containing VOC flowing into the water washing channel, absorb the VOC therein, and guide the VOC absorbing liquid into the water tank; The circulating water pump is used to pump the VOC absorbing liquid contained in the water tank to the VOC washing pipeline; the connecting water pipe is used to connect the water tank, the washing pipeline and the circulating water pump to transport the VOC absorbing liquid.

Wherein, the VOC washing pipeline is erected on the upper part of the water tank, and is fixedly connected with the top of the water tank; one end of the VOC washing pipeline is submerged under the liquid level of the VOC absorbing liquid contained in the water tank, forming a VOC absorption closed channel; The VOC gas inlet is connected to the modified flue gas outlet of the modification device through a pipe, and the modified flue gas containing VOC generated by the thermal modification treatment is introduced into the VOC washing pipe.

In particular, the lower end of the VOC water washing pipeline is trumpet-shaped.

In particular, the trumpet-shaped end of the VOC washing pipe is submerged below the liquid level of the VOC absorbing liquid in the water tank.

In particular, at least one nozzle is arranged inside the VOC washing pipeline to spray water into the VOC washing pipeline so that the water fully contacts the gas containing VOC and absorbs the VOC in the gas.

In particular, the spray head is a rotary spray head.

In particular, the installation height of the spray heads provided inside the VOC water washing pipeline is above the liquid level in the water tank; the number of the spray heads is 3-5. It is also possible to increase or decrease the number of nozzles according to the height of the washing pipeline.

In particular, the nozzles are arranged vertically from top to bottom. Make the VOC absorbing liquid contact with the VOC gas in all directions, which is conducive to fully absorbing the volatile organic compounds.

Wherein, the nozzle in the VOC washing pipeline is connected with the water outlet of the circulating water pump through a connecting water pipe, and the VOC absorption liquid contained in the water tank is pumped to the nozzle in the VOC washing pipeline.

In particular, the connecting water pipe connected to the spray head in the VOC water washing pipeline and the connecting water pipe connected to the water outlet of the circulating water pump are connected to each other through a three-way valve or a four-way valve, and the water pumped by the circulating water pump The water flow is distributed to the nozzles in the water washing pipeline for spraying.

Wherein, the water inlet of the circulating water pump is connected to the water tank through a connecting water pipe, and its water outlet is connected to the VOC washing pipeline through a connecting water pipe.

In particular, a water outlet of the water tank is opened at the middle and lower part of the water tank, and the water outlet is connected to the water inlet of the circulating water pump through a connecting water pipe.

Wherein, the water tank is a closed container.

In particular, the VOC absorbing liquid is selected from water or a weakly acidic solution, preferably water, for absorbing VOC.

Wherein, the fan system includes a heating fan and a smoke exhaust fan.

In particular, the heat supply fan is arranged on the connecting pipe connecting the heat exchange device and the thermal reforming device; the smoke exhaust fan is connected to the hot flue gas outlet pipe of the heat exchange device, The hot flue gas generated by the gasification combustion device is sucked to the heat exchange device for heat exchange.

In particular, the heat supply fan is arranged on the connecting pipe connecting the return air pipe of the heat reforming device and the heat reforming medium introduction pipe of the heat exchange device, and the heat reforming The neutralized medium is extracted from the return air pipe of the thermal modification device, enters the heat exchange device through the thermal modification medium introduction pipe, and performs heat exchange. The pipe enters the heat treatment chamber of the heat reforming device to heat the wood; the exhaust fan is set on the connecting pipe connected with the hot flue gas outlet pipe, and the smoke generated by the gasification combustion device that enters the heat exchange device The hot flue gas is discharged from the heat exchange device after heat exchange.

In particular, the heat supply fan also has the function of extracting the heat treatment medium after heat treatment in the heat treatment chamber from the heat treatment chamber and transporting it to the heat exchange device; the smoke exhaust fan also has the function of pumping the gasification combustion device The generated hot flue gas is extracted from the hot flue gas channel and delivered to the heat exchange device.

Compared with the prior art, the wood thermal modification treatment equipment of the utility model has the following advantages:

1. The gasification combustion device of the utility model uses plant-derived biomass such as crop stalks, garden waste, and wood processing residues as fuel, and has a wide range of raw materials. Compared with the equipment, the equipment investment is small, the operating cost is low, and the operation safety is high.

2. The gasification combustion device of the thermal modification equipment of this utility model has both the reverse burning function and the normal burning function. According to the needs of the wood thermal modification process, the forward and reverse burning operations can be flexibly realized to meet the needs of different treatment stages and The energy demand of the occasion; for example, in the preheating and heating stages of wood modification treatment, through gasification and backburning, full combustion can provide a large amount of sufficient heat, and the heating efficiency is high and pollution-free; In the case of heat preservation or system power failure, it can realize slow normal burning, so that the temperature of the furnace will not be raised or lowered sharply, which will affect the quality of thermally modified wood;

3. The outer surface of the grate assembly of the gasification combustion device of the thermal modification equipment of the present invention is attached with a refractory material layer to maintain the temperature of the outer surface of the material, which is beneficial to the gasification reaction, and the surface of the grate can be reduced by water cooling. The temperature can further extend the life of the grate, and can realize a small amount of self-produced steam to provide for the needs of wood thermal processing.

4. The return air valve on the return air pipe of the thermal modification device of the thermal modification device of the present utility model can adjust the flow rate of the thermal modification medium in different parts of the heat treatment chamber by adjusting the opening and closing or opening and closing degree of the return air valve , The flow speed can be adjusted by either a single return air pipe or a combination of multiple return air pipes, so as to ensure the uniformity of the temperature of the thermally modified wood in the heat treatment chamber and improve the quality of the thermally modified wood.

5. The VOC (volatile organic compound) collection device of the thermal modification equipment of this utility model can effectively collect the volatile organic compounds generated during the high-temperature thermal modification process through the circulation and filtration of multi-layer water film, which significantly reduces the heat loss. Emission and heat pollution of volatile organic compounds during the modification process, and at the same time provide the possibility of further utilization of volatile organic compounds;

6. The utility model can make the biomass burn twice, the combustion is sufficient, the pollution is small, and the heat exchange efficiency is high.

Description of drawings

Fig. 1 is the structural representation of the thermal modification treatment equipment of the utility model wood;

Fig. 2 is the structural representation of the gasification combustion device of the wood thermal modification treatment equipment of the utility model;

Fig. 3 is a schematic cross-sectional view along A-A in Fig. 2;

Fig. 4 is a schematic cross-sectional view along B-B in Fig. 3;

Fig. 5 is a schematic structural view of the grate assembly of the gasification combustion device;

Fig. 6 is a schematic diagram of the working state of the gasification combustion device of the utility model wood thermal modification treatment equipment during back-burning gasification;

Fig. 7 is a schematic diagram of the working state of the gasification combustion device of the wood thermal modification treatment equipment of the present invention when it is burning gasification;

Fig. 8 is a schematic cross-sectional view of the structure of the heat exchange device of the wood thermal modification treatment equipment of the present invention;

Fig. 9 is a schematic diagram on the left side of the structure of the heat exchange device of the wood thermal modification treatment equipment of the present invention;

Fig. 10 is a schematic view on the right side of the structure of the heat exchange device of the wood thermal modification treatment equipment of the present invention;

Figure 11 is a schematic cross-sectional view of the thermal modification device of the wood thermal modification treatment equipment of the present invention;

Fig. 12 is a schematic cross-sectional view along C-C in Fig. 11;

Fig. 13 is a schematic front view of the VOC collection device of the wood thermal modification treatment equipment of the present invention;

Fig. 14 is a schematic side view of a VOC collection device.

Explanation of reference signs

1. Gasification combustion device; 11. Counter-burning gasifier; 110. Furnace body; 111. Furnace liner; 1111. Upper combustion chamber; 1112. Lower combustion chamber; 112. Upper furnace door; 113. Lower furnace door; 114, flue gas outlet; 115, grate assembly; 1151, grate main body; 1152, upper steel pipe; 1153, lower steel pipe; 116, left auxiliary oxygen inlet; 117, right auxiliary oxygen inlet; 118, left auxiliary oxygen inlet Pipe; 119, right auxiliary oxygen inlet pipe; 120, auxiliary oxygen inlet valve; 121, feeding port; 122, top cover; 12, hot flue gas channel; 13, left normal burning flue gas channel; 14, right normal burning flue gas Passage; 15. Left forward-firing flue opening; 16. Right normal-firing flue opening; 17. Normal-firing flue valve; 2. Heat exchange device; 21. Heat exchange body; 22. Heat exchange cavity; 23. Heat exchange tube 24. Hot flue gas inlet pipe; 25. Hot flue gas outlet pipe; 26. Thermally modified medium inlet pipe; 27. Thermally modified medium outlet pipe; 3. Thermally modified device; 30. Thermally modified smoke Gas outlet; 31. Thermal modification treatment shell; 32. Heat treatment chamber; 33. Closed door; 34. Heat medium air inlet pipe; 35. Air inlet nozzle; 36. Return air pipe; 361. Return air valve; 37. Air return port; 38. Material pile; 39. Heat medium return air main; 4. VOC (volatile organic compound) collection device; 41. Water tank; 42. Washing pipeline; 43. Water pump; 44. Water pipe; 45. Nozzle; 46. Water tank outlet; 477, VOC gas inlet; 48, water; 49, water surface; 51, exhaust fan; 52, heating fan.

detailed description

The specific embodiments of the utility model will be described in detail below with reference to the accompanying drawings, and the advantages and characteristics of the utility model will become clearer along with the description. However, these embodiments are only exemplary, and do not constitute any limitation to the scope of the present utility model. Those skilled in the art should understand that, without departing from the spirit and scope of the utility model, the details and forms of the technical solution of the utility model can be modified or replaced, but these modifications and replacements all fall within the protection scope of the utility model .

As shown in Figure 1, the thermal modification treatment of wood of the present utility model is provided with gasification combustion device 1, heat exchange device 2, thermal modification device 3, volatile organic compound (VOC) collection device 4 connected successively by connecting pipeline And the exhaust fan 51 and the heating fan 52 that are connected with the heat exchange device are composed. The gasification combustion device of the utility model uses agricultural and forestry waste, residues, wood processing residues and other plant-sourced biomass as fuel, and releases heat through gasification reverse combustion/normal combustion. ) under the action of heat into the heat exchange device to heat the modified treatment medium; the heated modified treatment medium performs thermal modification treatment on the wood in the thermal modification device; finally, the modified VOC released during the thermal modification treatment process Non-toxic flue gas is collected by the VOC collection device and processed, which not only effectively utilizes agricultural and forestry waste and wood processing residues, but also reduces the pollution problem in the process of wood product processing.

As shown in Figures 1, 2, 3, and 4, the gasification combustion device 1 of the present utility model includes a gasification counter-burning furnace 11 in the shape of a cuboid or a cube as a whole, and is arranged on the rear side of the gasification counter-burning furnace body 110. The outside of the wall is connected with the gasification counter-burning furnace furnace 111 and is integrally connected with the furnace body. The furnace body is integrally connected with left and right normal-burning flue gas passages 13, 14, and a grate assembly 115 is arranged in the middle of the furnace. The grate assembly divides the furnace into upper and lower combustion chambers 1111, 1112.

The furnace 111 inside the furnace body 110 of the gasification counter-burning furnace is a cavity with a rectangular cross-section. The lower end of the furnace body is closed, and the upper end is provided with a fuel charging port 121 and a top cover 122 for sealing the charging port. The inner side of the lower end and upper end of the furnace body is composed of refractory materials, and the outer side is composed of thermal insulation materials (not shown in the drawings), which prevent and reduce the heat exchange between the furnace body and the surrounding environment. The refractory materials are mainly used to protect the furnace body from being burned out .

As shown in Fig. 2, upper and lower furnace doors 112, 113 for observing the combustion status of fuel in the furnace body are provided in the middle upper part and the lower part of the front side wall of the furnace body, which is beneficial to real-time adjustment of fuel addition and adjustment of the oxygen intake of oxygen in the furnace. quantity.

As shown in Figure 3, the lower part of the rear side wall of the furnace body is provided with a flue gas outlet 114; a vertical hot flue gas passage 12 is arranged on the outside of the rear side wall of the furnace body, and the hot flue gas passage is connected with the flue gas outlet to convert the gasification reaction The hot flue gas generated by the combustion of fuel in the furnace is exported to the reverse combustion furnace. The hot flue gas channel is tightly attached to the outside of the rear side wall of the furnace body as a whole. The inner wall of the hot flue gas channel is made of refractory material, and the outer side is wrapped with thermal insulation material to reduce heat loss.

As shown in Figure 4, the left and right side walls of the furnace body are respectively vertically provided with left and right normal-burning flue gas passages 13 and 14 which are closely fitted with the furnace body; The right firing flue openings 15, 16, the left and right firing flue openings are close to the top of the furnace body, respectively penetrate the left and right side walls of the furnace body, form through holes, and connect with the left and right firing flue gas passages 13, 14 respectively Through the channel, the hot flue gas generated by combustion in the normal combustion state is introduced from the upper part of the furnace body to the normal combustion flue gas channel. The left and right auxiliary oxygen inlets 116 and 117 respectively run through the left and right side walls of the furnace body at the same level as the flue gas outlet. The left and right auxiliary oxygen inlets are respectively connected to two auxiliary oxygen inlet pipes 118 and 119, and the left and right auxiliary oxygen inlet pipes respectively penetrate the left and right side walls of the furnace body and extend outside the furnace body of the gasification counter-burning furnace . The left auxiliary oxygen inlet pipe is placed horizontally, located at the bottom of the vertical left normal combustion flue gas channel and connected with the left normal combustion flue gas channel; the right auxiliary oxygen inlet tube is placed horizontally, located at the bottom of the right normal combustion flue gas channel and The right burning flue gas channel is connected. The left and right auxiliary oxygen inlet pipes extend outside the gasifier and respectively set auxiliary oxygen inlet valves 120 to transport the oxygen outside the gasifier into the furnace to provide oxygen for fuel combustion in the furnace. The left and right normal burning flue openings are respectively provided with normal burning flue valves 17. When the normal burning flue valves are opened, the gasification counter-burning furnace is connected with the left and right normal burning flue gas passages, and the hot flue gas generated by combustion is transferred from the The upper part of the furnace body is introduced into the left and right normal combustion flue gas passages through the left and right normal combustion flue ports, and flows into the lower combustion chamber of the gasifier through the auxiliary oxygen inlet pipe and the auxiliary oxygen inlet; then through the flue gas outlet, the hot flue gas The channel is discharged; when the valve of the normal combustion flue is closed, the gasification counter-burning furnace and the left and right normal combustion flue gas channels are blocked. The left and right auxiliary oxygen inlets are set at the same level as the flue gas outlet, that is, the axes of the left and right auxiliary oxygen inlets are at the same level as the axis of the flue gas outlet opened on the lower part of the rear side wall of the furnace body, reducing It reduces the resistance of the fan that draws the hot flue gas out of the furnace body, which is more conducive to heat exchange.

The auxiliary oxygen inlet valve can open the auxiliary oxygen inlet to supply oxygen to the furnace body when the oxygen in the furnace body is insufficient and black smoke appears during the combustion process. Make combustion more complete and complete.

As shown in Figure 5, the grate assembly 115 fixedly installed in the middle of the furnace is composed of a flat grate body 1151 and upper and lower steel pipes 1152 and 1153 located at the upper and lower ends of the grate body, and divides the furnace into upper and lower combustion chambers . The main body of the fire grate is composed of multiple steel pipes (select 4 in the specific embodiment of the utility model, usually 2-5) arranged in parallel and spaced from each other, and the distance between adjacent two steel pipes is 4-10mm (preferably is 6mm). The upper and lower steel pipes are located at both ends of the main steel pipe of the grate, perpendicular to the steel pipes constituting the main body of the grate, and the upper and lower steel pipes communicate with the steel pipes constituting the main body of the grate to form a channel inside. The grate assembly is placed in the furnace at an inclination angle of 0-10° (preferably 5°), that is, the angle between the main plane of the grate and the horizontal plane is 0-10°, which is conducive to the automatic upward movement of the steam generated in the grate It moves and is beneficial to the removal of moisture inside the grate in the later stage. The lower steel pipe is set at the lower middle part of the front side wall of the furnace body, and the upper steel pipe is set at the upper middle part of the rear side wall of the furnace body. One end of the upper and lower steel pipes is closed, and the other end is open. The closed ends are respectively arranged on the front right side wall or side wall of the furnace body, and the open ends extend beyond the left side wall or the right side wall of the furnace body (Fig. 1). The cooling water pipes are connected to each other, the cooling water flows in from the lower steel pipe, introduces the cooling water into the grate assembly in the furnace, and flows out from the upper steel pipe to cool the grate assembly.

The upper and lower steel pipes of the grate assembly of the utility model are welded together with multiple steel pipes forming the main body of the grate, and the upper and lower steel pipes and the steel pipes forming the main body of the grate are connected to each other at the welding place to form a channel, that is, connected to the grate The axes of the upper steel pipe and the lower steel pipe welded together by the main body steel pipes are perpendicular to the axes of the steel pipes forming the main body of the grate, and communicate with each other at the welding place. Cooling water is passed into the steel pipe of the grate assembly,

The outer surface of the steel pipe that forms the main body of the grate is attached with a layer of refractory material with a thickness of ≥10mm (not shown in the figure). During the firing process, water cooling can be used to feed condensed water into the grate steel pipe according to the temperature in the furnace and the surface temperature of the steel pipe to cool the grate, reduce the temperature of the grate surface, and further extend the life of the grate . When the temperature in the furnace is too high (≥900°C), it will affect the service life of the steel pipe, and the condensed water in the steel pipe can cool and protect the grate, and while protecting the grate, the inside of the grate As the condensed water absorbs heat, part of the moisture can be turned into water vapor. Since the grate has a certain inclination angle, the generated steam will automatically move upwards to be removed from the upper steel pipe of the grate, and then the generated steam will be passed into the wood The interior of the thermal modification device can heat and adjust the humidity of the wood.

The fuel enters the furnace from the charging port 121, and under the support of the grate assembly, the fuel burns in the upper combustion chamber above the grate assembly, and the incompletely burned fuel and the scorching charcoal produced during the combustion process enter under the action of gravity The lower combustion chamber continues to burn. During the combustion process, the flue gas generated in the upper combustion chamber enters the lower combustion chamber for secondary combustion under the action of the smoke exhaust fan, and burns the incompletely burned part of the upper combustion chamber again, so that the fuel is fully burned. No black smoke will be produced, and a large amount of clean hot smoke will be produced. The fuel (waste and residue in agriculture, forestry, animal husbandry, etc.) can be fully burned through two combustions, and the combustion is complete, reducing the emission of pollutants.

As shown in Figures 1, 8, 9, and 10, the heat exchange device 2 includes a cylindrical heat exchange device body 21 made of heat insulating material, a heat exchange cavity 22 inside the body, and a plurality of tubes arranged in the heat exchange cavity. The heat exchange pipe 23, the hot flue gas inlet pipe 24, the hot flue gas outlet pipe 25, the heat modifying medium inlet pipe 26, and the heat modifying medium outlet pipe 27 fixedly connected with the body. The upper and lower ends of the cylindrical body are closed, and the heat exchange tubes are evenly arranged along the axial direction of the body. The hot flue gas inlet pipe and the hot flue gas outlet pipe are connected to the heat exchange chamber in the body; the heat-modified medium inlet pipe and the heat-modified medium outlet pipe are connected to the exchange pipe, and the medium is passed through the air deflector (not shown) Out) flows through the heat exchange tube.

As shown in Figures 9 and 10, the hot flue gas inlet pipe 24 and the thermal modification medium introduction pipe 26 are arranged at the lower end of the body, separated from each other without interfering with each other; the heat modification medium introduction pipe and the heat exchange tube located at the lower end of the body pass through The flanges are connected, and the thermal modification medium in the thermal modification device is introduced into the heat exchange device for heat exchange to obtain the heat medium for thermal modification treatment; the hot flue gas outlet pipe 25 and the thermal modification medium outlet pipe 27 are set At the upper end of the main body, they are separated from each other and do not interfere with each other; the thermal modification medium outlet pipe and the other end of the heat exchange tube located at the upper end of the main body are connected through a flange, and the thermal modification after heat exchange is absorbed by the heat of the hot flue gas. The processed heat medium is exported to the heat exchange device, and driven by the heat supply fan, the heat modified medium after heat exchange enters the heat modification device for thermal modification treatment of wood.

Under the action of the exhaust fan 51, the hot flue gas generated by the gasification combustion device enters the heat exchange chamber from the hot flue gas inlet pipe 24 at the lower end of the body, flows through the heat exchange pipe from bottom to top, and transforms with the heat in the heat exchange pipe. heat exchange with the neutral medium, and then flows out from the hot flue gas outlet pipe 25 located at the upper end of the body under the drive of the smoke exhaust fan; The modified medium inlet pipe 26 enters the heat exchange tube in the heat exchange chamber area, absorbs the heat of the hot flue gas, and flows out of the heat exchange device from the heat modified medium outlet pipe 27 located at the upper end of the main body, and enters the heat treatment device.

Any existing known heat exchanger capable of gas heat exchange in the art is applicable to the present invention. The gas heat exchanger used in the utility model is a shell-and-tube heat exchanger.

As shown in Figures 1, 11, and 12, the heat reforming device 3 includes a heat-modifying shell 31 made of heat-insulating and heat-insulating materials that is in the shape of a cuboid or cube as a whole, and the heat treatment chamber 32 inside the shell is rectangular in cross section. The cavity, the heat medium air inlet pipe 34 arranged on the upper part of the heat treatment chamber and close to the front side wall of the housing, and the return air duct 36 located at the rear of the heat treatment chamber and close to the rear side wall of the housing are opened on the upper part of the rear side wall of the housing The thermally modified flue gas outlet 30.

An openable and closable closing door 33 is arranged on the front side of the housing, and its rear side is closed. The air inlet pipe is placed horizontally in the heat treatment chamber, close to the upper part of the closed door, that is, the air inlet pipe is fixedly installed on the upper part of the heat treatment chamber, on the side close to the closed door (that is, the front side of the housing), parallel to the front side of the housing ( That is, the air inlet pipe is placed horizontally along the closed door). One end of the air inlet pipe is closed, and the other end communicates with the thermal modification medium outlet pipe 27 of the heat exchange device through a connecting pipe made of insulating material, so that the heat treatment medium that has absorbed heat in the heat exchange device is introduced into the thermal modification device.

At least one heat medium air inlet pipe is fixedly installed on the upper part of the left side wall or the right side wall of the housing, close to the closed door (i.e. the front side of the housing), and the air inlet pipe is placed horizontally along the closed door 33 and fixed on the The upper part of the heat treatment chamber. One end of the air inlet pipe is closed, and the other end passes through the upper part of the left or right side wall of the shell, and is connected with the connecting pipe made of thermal insulation material, and connected with the thermally modified medium outlet pipe of the heat exchange device through the connecting pipe The circulation channel of the thermal modification medium is formed, and the thermal modification medium after heat exchange is introduced into the thermal modification device.

The length of the air inlet pipe in the heat treatment chamber matches the length of the front side wall of the heat treatment chamber; and a plurality of air inlet nozzles 35 towards the material pile 38 to be modified are evenly installed on the surface of the air inlet pipe, for spraying heat treatment to the material pile. Medium, heating material pile.

In the specific embodiment of the utility model, one end of the heat medium air inlet pipe connected with the connecting pipe passes through the upper part of the left side wall of the housing, and is connected with the heat modification medium outlet pipe, and sends the heat treatment medium after heat exchange into the heat treatment Inside the chamber, wood is heated.

The air inlet nozzle evenly installed on the air inlet pipe towards the direction of the material pile is fixedly connected with the air inlet pipe, and evenly sprays the heat treatment medium to the material pile, so as to ensure that the heat treatment medium introduced into the heat treatment chamber from the air inlet pipe flows evenly to the material pile 38, Improve the uniformity of the temperature field during the heat treatment of the pile.

Inside the heat treatment chamber, near the rear side of the housing (i.e., the closed end), horizontally arrange multiple return air ducts 36 (at least 3 units/group), and the return air ducts are arranged horizontally from top to bottom along the rear side of the housing (Fig. 11, 12). A plurality of return air pipes are evenly arranged from the middle upper part to the bottom on the back side of the shell, and are divided into upper, middle and lower return air pipes/groups. The arrangement height of the upper, middle and lower return air pipes/groups is the same as the upper , middle and lower heights match. The plurality of return air pipes placed horizontally along the rear side of the shell in the heat treatment chamber of the utility model are divided into upper, middle and lower groups according to the order from top to bottom, that is, the upper, middle and lower return air pipes of the thermal modification treatment chamber Group. Three return air ducts are arranged in the thermal reformation treatment room in the specific embodiment of the utility model, that is, the upper, middle and lower return air ducts.

The return air pipe is arranged horizontally from top to bottom along the rear side of the heat treatment chamber, located inside the heat treatment chamber, one end is closed, the other end passes through the left or right side wall of the shell, protrudes outside the shell, and is connected with the heat preservation The heat medium return air main pipe 39 made of material is connected, and the thermally modified medium is exported to the heat treatment device through the return air main pipe. The length of the return air duct in the heat treatment chamber matches the length of the rear side wall of the heat treatment chamber; and the return air duct is located on the surface of the pipeline inside the heat treatment chamber to offer a plurality of return air outlets 37, and the return air outlets are evenly distributed on the surface of the return air duct , evenly collect the heat treatment medium after passing through the pile.

A return air valve 361 is installed inside the end of each return air pipe protruding from the shell, and the opening and closing or opening degree of the return air valve is controlled by a control system (not shown in the figure) to adjust the modification of the inflow material pile. The flow rate of the medium controls the uniformity of the temperature field of the modified material pile, that is, through the opening and closing or opening degree of the return air valve on each return air pipe, the individual adjustment of a single/group return air pipe and the multiple/group return air pipe can be realized Used in combination to ensure the uniformity of the temperature of wood modification in the heat treatment chamber.

The thermal modification medium outlet pipe of the heat exchange device is connected with the thermal modification medium inlet pipe on the shell of the thermal modification device; the thermal modification medium inlet pipe of the heat exchange device is connected with the heat medium return air main pipe of the thermal modification device connected (or directly connected to the return air pipe). After the heat exchange treatment, the thermally modified medium that has absorbed heat flows out from the thermally modified medium outlet pipe, enters the heat treatment chamber from the heat medium air inlet pipe on the upper part of the heat reforming device shell, and passes through the air inlet nozzle to the thermally modified medium. The heat treatment medium is evenly sprayed into the material pile, and the heat treatment medium passes through and heats the material pile. Under the action of the heating fan, it is collected by the return air port on the return air pipe, enters the return air pipe, flows into the heat medium return air main pipe, and then passes through The thermal modification medium introduction pipe of the heat exchange device enters the heat exchange tube of the heat exchange device, performs heat exchange, reabsorbs heat, forms a wood modification treatment heat medium, and then enters the thermal modification device.

At least one modified flue gas outlet 30 is provided on the upper part of the rear side of the housing, and the modified flue gas outlet is connected with the water washing pipeline of the volatile organic compound (VOC) collection device 4, and the wood is heated during the thermal modification process. The released flue gas containing VOC is exported to the thermal modification device.

The heat treatment chamber is also provided with a temperature sensor for measuring the temperature of the wood during the heat modification process. The temperature sensors are respectively arranged on the planes of the incoming and outgoing material piles and the central surface of the material piles parallel to the rear side wall of the shell, and are arranged from top to bottom to measure the temperature of the upper, middle and lower parts of the material piles respectively. Temperature, that is, three sets of temperature sensors are respectively arranged from top to bottom on the plane and center plane of the incoming and outgoing piles of the pile parallel to the rear side wall of the shell (that is, from top to bottom in the middle of the pile) Next, set up a set of temperature sensors in the upper, middle, and lower parts of the pile, respectively, to measure the thermal modification temperatures T ₁ , T ₂ , and T ₃ of the wood in the upper, middle, and lower parts of the pile during the thermal modification process) .

It also includes a control system (not shown in the figure) for regulating the opening/closing of the return air valve and the opening degree of the return air valve. The control system is composed of a control box arranged outside the thermal reforming device. The return air valve is connected. By measuring the temperature of the upper, middle and lower parts of the material pile, the opening and closing or opening degree of the electric return air valve is adjusted, the flow speed of the heat treatment medium is adjusted, and the uniformity of the heat treatment temperature in the heat treatment chamber is adjusted. By controlling the opening degree of the return air valve installed on the return air pipe of the thermal modification device, the regulation and control of the uniformity of the wood treatment temperature during the wood thermal modification process is realized; by controlling the opening or closing of the heating fan, the Heat is supplied to the heat treatment chamber for heat modification treatment.

As shown in Figures 1, 13, and 14, the volatile organic compound (VOC) collection device 4 consists of a water tank 41 containing VOC absorption liquid, at least one cylindrical VOC (volatile organic compound) washing pipeline 42 fixed on the top of the water tank, At least one water pump 43 and a plurality of connecting water pipes 44 are formed, and the connecting water pipes connect the water tank, the water washing pipeline, and the water pump to each other and transport the VOC absorbing liquid.

The water tank for holding and collecting VOC absorbing liquid is a closed cuboid or cylindrical container with a sealed top, which can prevent pollution on the one hand and dissolve the gas better on the other hand. Water tank in the utility model is cuboid shape.

Store the absorbing liquid that absorbs VOC in the water tank (the VOC absorbing liquid in the utility model embodiment is water), and the middle and lower part of the water tank is provided with water tank water outlet 46, and water outlet is connected with water pump through connecting water pipe, and water is driven by water pump. Next, it flows out from the water outlet at the lower part of the water tank, and enters the water pump through the connecting water pipe, that is, the VOC absorbing water flows out from the water outlet of the water pump under the action of the water pump, and enters the VOC washing pipeline through the connecting water pipe, and sprays water in the washing pipeline. Absorb the VOC in the gas, so that the VOC dissolves in the water and falls back to the water tank.

The VOC washing pipeline is used to spray water to the VOC-containing gas flowing into the washing channel, absorb the VOC, and introduce the water into the water tank; the VOC washing pipeline is erected on the upper part of the water tank, and one end of the VOC washing pipeline is immersed in the water surface in the water tank Below 49, a VOC absorption closed channel is formed; the other end is a VOC gas inlet 47 connected to the modified flue gas outlet of the thermal modification device, and the VOC-containing gas generated by the thermal modification of wood is introduced into the VOC washing pipeline .

One end of the VOC washing pipeline submerged under the water surface is in the shape of a horn, and the horn-shaped top can prevent back suction and increase the absorption area; at least one rotating nozzle 45 is arranged inside the VOC washing pipeline to spray water into the VOC washing pipeline for absorbing VOC ; The installation height of the nozzle is above the water surface in the water tank, that is, the nozzle is located at the top of the water surface of the water tank.

In the VOC collection device of the utility model, two VOC washing pipes are selected, fixed on the top of the water tank by welding, and erected on the upper part of the water tank. Each VOC washing pipe is equipped with 3 rotating nozzles from top to bottom. When spraying water into the washing pipe, the contact area between water and VOC is increased, and it can be rotated at any angle to absorb VOC in all directions without leaving any dead space. , high absorption efficiency. Except the rotating spray head, any other existing spray heads are applicable to the present utility model.

The water inlet of the water pump pumping the VOC absorbing liquid is connected to the water outlet at the lower part of the water tank through the connecting pipe; the water outlet is connected to the nozzle in the VOC washing pipeline through the connecting pipe. The VOC absorbing liquid (water liquid) in the water tank flows through the water pump from the water outlet at the lower part of the water tank under the action of the water pump, flows out from the water outlet of the water pump, and then diverts through the connecting water pipe to pump the water at the lower part to the high nozzle, that is, Through at least one three-way valve or four-way valve (not shown in the drawings) installed on the connecting water pipe, the water in the connecting water pipe will flow to the nozzle in the high-level water washing pipeline, and then the water will fall back along the water washing pipeline after spraying to the water tank.

The water sprayed by the nozzle not only fully mixes with the gas containing VOC in the washing pipeline, absorbs and collects VOC, falls back to the water tank, and then pumps it into the washing pipeline through a water pump, and then absorbs VOC. It can also cool down the VOC-containing mixed gas released by high-temperature thermal sensitivity of wood, so that water-soluble and acidic volatile organic compounds are easily absorbed by the absorbing liquid, and the solubility in water is increased.

The fan system includes a heating fan and a smoke exhaust fan. The heat-supply fan is arranged on the connection pipe connecting the return air pipe of the thermal modification device and the heat-modified medium introduction pipe of the heat-exchange device, through the action of the heat-supply fan, the heat-modified medium is transferred from The return air pipe of the heat reforming device is drawn out, and enters the heat exchange device through the heat reforming medium inlet pipe for heat exchange, and the heat exchanged medium is drawn out from the heat reforming medium outlet pipe, and enters the heat reforming device through the air inlet pipe The heat treatment chamber is used to heat wood; the exhaust fan is arranged on the connecting pipe connected with the hot flue gas outlet pipe, and the hot flue gas produced by the gasification combustion device entering the heat exchange device is heated After the exchange, the heat exchange device is discharged.

The working process of the wood thermal modification treatment equipment of the present utility model will be described in detail below in conjunction with accompanying drawings 1-14.

1. Gasification combustion energy supply

In the stages of wood preheating, heating, etc., which use more heat energy, as shown in Figure 6, close the normal burning flue valves in the normal burning flue ports on the left and right sides of the gasification burner, open the top cover, and use biomass fuel (such as agriculture and forestry) waste, wood processing residues, etc.) into the gasifier from the feed port, turn on the exhaust fan and open the auxiliary oxygen inlet valves in the auxiliary oxygen inlet pipes on the left and right sides; fresh air enters from the feed port, and the fuel burns on the top Indoor gasification and back burning to continuously generate combustible gas and plant-sourced biomass charcoal;

The combustible gas and biomass charcoal enter the lower combustion chamber through the grate assembly, and the oxygen enters the lower combustion chamber from the auxiliary oxygen inlet through the auxiliary oxygen inlet pipe, so that the combustible gas and biomass charcoal can be fully combusted, and a large amount of hot flue gas is generated. Driven by the smoke exhaust fan, it enters the heat exchange device through the flue gas outlet, the hot flue gas channel, and the hot flue gas inlet pipe in turn for heat exchange treatment.

As shown in Figure 7, when the normal firing operation is required or only heat preservation is required or the equipment is powered off, close the top cover, open the normal firing flue valves in the left and right sides of the normal firing flue openings, and simultaneously close the left and right auxiliary The auxiliary oxygen inlet valve in the oxygen inlet pipe opens the upper and lower furnace doors of the furnace body, and the oxygen during the normal combustion process is supplied from the upper and lower furnace doors; the fuel undergoes normal combustion gasification combustion in the upper combustion chamber, and the hot smoke generated Under the action of the exhaust fan or the natural draft of the hot flue gas channel, the gas flows through the normal burning flue gas channels on the left and right sides and the auxiliary gas channels on the left and right sides respectively from the burning flue openings located on the left and right sides of the upper part of the furnace. The oxygen inlet pipe and the auxiliary oxygen inlets on the left and right sides enter the lower combustion chamber, and then enter the heat exchange device through the flue gas outlet, hot flue gas channel, and hot flue gas inlet pipe for heat exchange treatment.

2. Heat exchange treatment

Any existing known heat exchanger capable of gas heat exchange in the art is applicable to the present invention. The gas heat exchanger used in the utility model uses a surface heat exchanger for heat exchange, usually a shell-and-tube heat exchanger.

3. Thermal modification of wood

The temperature of the thermal modification treatment of wood in the heat treatment chamber of the wood thermal modification device of the present utility model is set as T; The temperature (T ₁ , T ₂ , T ₃ ) of the wood in three different parts of the middle and lower parts.

1. The wood to be thermally modified by sawing into wood sections is stacked in the heat treatment chamber of the thermal modification device according to the wood drying method in the field, piled up into a pile, and the closed door is closed;

2. According to the flow direction of the heat treatment medium (that is, the direction from the front side to the rear side of the heat treatment chamber, that is, the direction from the heat medium air inlet pipe to the return air pipe), it is installed at the entrance and exit of the material pile and the middle position of the material pile At least one set of temperature sensor groups (that is, from top to bottom at the position of the material stack parallel to the plane of the incoming and outgoing material stack parallel to the front side or rear side wall of the heat treatment shell, and the middle plane parallel to the front side or rear side wall, The upper, middle and lower parts of the pile are respectively provided with at least 3 groups of temperature sensors), which are used to measure the real-time temperature of the wood in the thermal modification process of the upper, middle and lower parts of the pile, and measure the corresponding real-time temperature. The average value is measured and recorded as the thermal modification temperatures T ₁ , T ₂ , and T ₃ of the upper, middle, and lower parts of the pile;

3. Turn on the heating fan and the automatic control system, set the temperature T of the thermal modification treatment of wood in the heat treatment chamber through the automatic control system, and measure the real-time temperature of the wood in the upper, middle and lower parts of the wood pile in real time through the temperature sensor (T ₁ , T ₂ , T ₃ ). Open the return air valves in the return air ducts of the upper, middle and lower parts, and keep the opening angle at 60° (that is, the angle between the position of the valve when it is closed is 60°), until the central temperature of the pile rises to Set modification temperature T; Timber central temperature T ₂ is consistent with the wood thermal modification temperature T of setting after keeping the opening angle of the return air valve in the middle part return air duct corresponding to the position of the middle part of the material pile all the time to be 60 °, That is to keep the opening angle of the return air valve in the middle return air duct at 60° all the time, so that the temperature T2 in the middle of the wood is _consistent with the set wood thermal modification temperature T.

4. After the wood temperature in the thermal modification device reaches T, under the condition that the temperature is kept at T, the thermal insulation treatment is carried out for 2 hours per centimeter of wood thickness. During the thermal insulation process, the automatic control system is based on the measured temperature T ₁ , T ₂ , T ₃ are compared with the set thermal modification temperature T of the wood, and then adjust the opening and closing or opening degree of the return air valve in the return air duct to provide heat for the thermally modified treated wood, and to maintain the heat of the modified treated wood. Uniformity of modification temperature;

① When T ₁ -T ₂ > 30°C, close the electric return air valve in the upper return air pipe corresponding to the upper position of the wood pile, rapidly reduce the flow of thermal modification medium flowing into the upper part of the wood, and quickly reduce the thermal modification of the upper part of the wood. temperature, so that the thermal modification temperature of the upper part of the wood is consistent with the temperature of the middle wood, and the uniformity of the thermal modification temperature is improved;

②When 10°C<T ₁ -T ₂ ≤30°C, adjust the opening angle of the electric return air valve in the upper return air pipe corresponding to the upper position of the material pile to 45° (that is, the angle between the position of the valve when it is closed Angle is 45°), close the opening degree of the return air valve, reduce the flow of thermal modification medium flowing into the upper part of the wood, reduce the thermal modification temperature of the upper part of the wood, make the thermal modification temperature of the upper part of the wood consistent with the temperature of the middle part of the wood, and improve Uniformity of thermal modification temperature;

③ When -10°C≤T ₁ -T ₂ ≤10°C, adjust the opening angle of the electric return air valve in the upper return air duct corresponding to the upper position of the material pile to 60° (that is, the position of the valve when it is closed) The included angle is 60°), adjust the opening degree of the return air valve in the upper return air pipe corresponding to the upper position of the material pile to be consistent with the electric control valve in the middle return air pipe corresponding to the middle position of the material pile;

④ When -30°C≤T ₁ -T ₂ <-10°C, adjust the opening angle of the electric return air valve in the upper return air duct corresponding to the upper position of the material pile to 75° (that is, the position of the valve when it is closed The included angle is 75°), increase the flow rate of the thermal modification medium flowing into the upper part of the wood, increase the thermal modification temperature of the upper part of the wood, make the thermal modification temperature of the upper part of the wood consistent with the temperature of the middle wood, and improve the uniformity of the thermal modification temperature sex;

⑤ When T ₁ -T ₂ <-30°C, adjust the opening angle of the electric return air valve in the upper return air duct corresponding to the upper position of the material pile to 90° (that is, the angle between the position of the valve and the position of the valve when it is closed is 90°, that is, the valve is fully open), rapidly increase the flow rate of the thermal modification medium flowing into the upper part of the wood, and increase the thermal modification temperature of the upper part of the wood;

⑥ When T ₃ -T ₂ > 30°C, close the electric return air valve in the lower return air pipe corresponding to the lower part of the wood pile, rapidly reduce the flow of thermal modification medium flowing into the lower part of the wood, and quickly reduce the thermal modification of the lower part of the wood. temperature, so that the thermal modification temperature of the lower part of the wood is consistent with the temperature of the middle part of the wood, and the uniformity of the thermal modification temperature is improved;

⑦When 10°C<T ₃ -T ₂ ≤30°C, adjust the opening angle of the electric return air valve in the lower return air duct corresponding to the lower position of the pile to 45° Angle is 45°), close the opening degree of the return air valve, reduce the flow of thermal modification medium flowing into the lower part of the wood, reduce the thermal modification temperature of the lower part of the wood, make the thermal modification temperature of the lower part of the wood consistent with the temperature of the middle wood, and improve Uniformity of thermal modification temperature;

⑧When -10°C≤T ₃ -T ₂ ≤10°C, adjust the opening angle of the electric return air valve in the lower return air duct corresponding to the lower position of the material pile to 60° (that is, the position of the valve when it is closed) The included angle is 60°), adjust the opening degree of the return air valve in the lower return air pipe corresponding to the lower position of the material pile to be consistent with the electric control valve in the middle return air pipe corresponding to the middle position of the material pile;

⑨When -30°C ≤ T ₃ -T ₂ < -10°C, adjust the opening angle of the electric return air valve in the lower return air duct corresponding to the lower position of the material pile to 75° (that is, the position of the valve when it is closed The included angle is 75°), increase the flow rate of the thermal modification medium flowing into the lower part of the wood, increase the thermal modification temperature of the lower part of the wood, make the thermal modification temperature of the lower part of the wood consistent with the temperature of the middle wood, and improve the uniformity of the thermal modification temperature sex;

⑩When T ₃ -T ₂ <-30°C, adjust the opening angle of the electric return air valve in the lower return air duct corresponding to the lower position of the material pile to 90° (that is, the angle between the position of the valve and the position of the valve when it is closed is 90°, that is, the valve is fully open), rapidly increase the flow rate of the thermal modification medium flowing into the lower part of the wood, and rapidly increase the thermal modification temperature of the upper part of the wood.

5. During the heat modification process, after 2 hours of thermal modification heat preservation treatment for each centimeter of wood thickness, the heating fan is turned off, the temperature is lowered, and the humidity is adjusted. When the temperature is lower than 60 ° C, it is out of the kiln.

4. VOC collection and treatment

The thermally modified flue gas generated during the thermal modification of wood is discharged from the modified flue gas outlet of the thermal modification device and enters the VOC washing pipe through the pipe, and the modified flue gas containing VOC flows from top to bottom along the water washing pipe In the process of washing, the nozzle in the washing pipe sprays VOC absorbing liquid (usually water) to absorb the VOC in the modified flue gas. After absorbing the VOC, the absorbing liquid falls back into the water tank along the washing pipe. Under the action of the water pump, the water in the water tank is continuously pumped from the lower part to the nozzle in the water washing pipeline, sprayed again, and VOC is absorbed again, and the cycle is repeated until the heat-free flue gas is discharged from the thermal modification device, that is, the collection of VOC is completed.

Claims (8)

1. A kind of thermal modification treatment equipment of wood, it is characterized in that, comprises the gasification combustion device, heat exchange device, thermal modification device, volatile organic compound collection device and the blower fan that are connected with heat exchange device successively connected by connecting pipeline system, of which The gasification combustion device includes a reverse burning gasifier, a hot flue gas channel, a normal burning flue gas channel and a grate assembly located in the gasifier, wherein: the hot flue gas channel is located in the gasifier The outside of the rear side wall is integrally connected with the gasifier body and communicates with the gasifier; the normal combustion flue gas channel is arranged outside the left and right side walls of the gasifier The furnace body is integrally connected and communicated with the gasifier; the grate assembly is fixed in the middle of the gasifier, and divides the gasifier into upper and lower combustion chambers; The thermal modification device includes a rectangular parallelepiped or cube-shaped casing as a whole, a heat treatment chamber, an air inlet pipe, a return air pipe, and a modified flue gas outlet, wherein the rear side of the casing is closed, and the front side is provided with The closed door of opening and closing; the heat treatment chamber inside the housing is a cavity with a rectangular cross section; the air inlet pipe is fixed on the upper part of the heat treatment chamber and is placed horizontally along the front side wall of the housing near the front side wall; The air return pipe is arranged inside the heat treatment chamber, placed close to the rear side wall of the housing and placed horizontally along the rear side wall of the housing; smoke. 2. The equipment according to claim 1, characterized in that, the reverse burning gasifier comprises a furnace body, a furnace liner, a flue gas outlet, and a fire grate assembly, wherein the furnace body as a whole is in the shape of a cuboid or a cube type; the cross-section of the furnace cavity inside the furnace body is rectangular, forming a gasification combustion chamber; the grate assembly is arranged in the middle of the furnace, and the furnace cavity is divided into upper and lower combustion chambers; the flue gas outlet It is arranged on the rear side wall of the lower combustion chamber. 3. The equipment according to claim 2, wherein the grate assembly comprises a flat grate body and upper and lower steel pipes located at the upper and lower ends of the grate body, wherein the grate body is composed of multiple Two steel pipes are arranged in parallel, and the adjacent steel pipes are arranged at intervals; the upper and lower steel pipes are integrally connected with the main steel pipe of the grate, and communicate with each other at the joints to form a water flow channel. 4. equipment as claimed in claim 1, is characterized in that, the length that described air inlet pipe is located in heat treatment chamber matches the length of the horizontal direction of the front side wall of heat treatment chamber; And air inlet pipe is positioned at the pipeline inside heat treatment chamber A plurality of air inlet nozzles facing the wood to be treated are opened on the surface of the machine. 5. The device according to claim 1, characterized in that there are at least three return air pipes arranged horizontally from top to bottom along the horizontal direction of the rear side wall of the casing, and the installation heights of the three return air pipes are respectively It is adapted to the height of the upper, middle and lower parts of the wood to be treated in the heat treatment chamber. 6. equipment as claimed in claim 5, it is characterized in that, the length of described air return pipe being located in the heat treatment chamber matches the length of the horizontal direction of the rear side wall of heat treatment chamber; a return air vent. 7. The equipment according to any one of claims 1-6, wherein the volatile organic compound collection device comprises a water tank containing VOC absorption liquid, at least one VOC washing pipeline, at least one water pump and multiple A water pipe, wherein the VOC washing pipeline is erected on the upper part of the water tank, and one end of the VOC washing pipeline is submerged below the liquid level of the VOC absorbing liquid contained in the water tank to form a VOC absorption closed channel; the water pump is connected to the water tank through the water pipe , VOC washing pipes are connected, and the absorption liquid in the water tank is pumped into the VOC washing pipes to absorb VOCs. 8. The device according to claim 7, wherein at least one nozzle is arranged inside the VOC washing pipeline, and the absorbing liquid is sprayed into the VOC washing pipeline, so that the absorbing liquid is fully contacted with the gas containing VOC, and absorbs the VOC in the gas. VOC.