JP3230246U - Combustion device for small once-through boilers using highly hydrous bark fuel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize the generated heat energy, to economically dry wood and use it as a fuel, and to dry a hydrous wood while controlling it to an ideal temperature to obtain a fuel chip for a highly hydrous bark. Provide a combustion device for a small once-through boiler that can be used. SOLUTION: This is a combustion device for a small once-through boiler 2, and a combustion furnace input port 12 contains a high moisture content, using a bark chip having a high moisture content of 40% or more used in the combustion furnace 1 for the boiler 2 as fuel. When the bark of the tree is sequentially transported upward by the belt conveyor 27, a limit frame is attached to control the amount of drop supply, and the fuel is charged from the upper part of the hopper for fuel injection. It is thrown in to promote combustion, and the air flow is directed upward toward the burning fuel from the inlet installed at the bottom of the furnace bottom, and toward the fuel at the bottom of the furnace and its combustion flame. A moistened bark fuel having air blowing inlets at 10 to 100 points of the combustion furnace 1 along the inner wall surface of the combustion furnace so as to be sprayed radially from the inner surface of the furnace was used. [Selection diagram] Fig. 2

Description

The present invention is a combustion gas generator capable of combustion processing using crushed material chips of high water content tree bark as fuel, and is a high water content tree bark including a combustion part, a heat exchange part, an exhaust gas treatment part, and a steam generation part. The present invention relates to a combustion device for a small once-through boiler used as fuel.

External heat type drying furnaces and incinerators for drying hydrous organic waste products and waste materials are known. There was also a proposal to combine a drying furnace and an incinerator and use the combustion exhaust gas from the incinerator as a heat source for the drying carbonization furnace. (See Patent Documents 1, 2 and 3.)

In addition to making effective use of the combustion ash generated when burning woody biomass, the combustion equipment includes a combustion furnace for burning woody biomass fuel containing potassium components and a boiler installed on the downstream side of the combustion furnace. , Equipped with a bag filter installed on the downstream side of the boiler to remove the combustion ash discharged from the combustion furnace and a classifier for classifying the combustion ash collected by the bag filter, and below the classification point classified by the classifier The potassium component concentration in the fine powder combustion ash having the size of is higher than the potassium component concentration in the coarse powder combustion ash having a size equal to or larger than the classification point, and the classification point of the classifier should be adjusted based on the properties of the woody biomass fuel. (See Patent Document 4).

To provide a pyrolysis type woody biomass boiler that generates much less carbon dioxide, a pyrolysis furnace that thermally decomposes wood fuel and magnetization that causes oxygen deficiency by passing air taken into the pyrolysis furnace. It is composed of a boiler tank part that is provided so as to surround the pyrolysis furnace and heats stored water by the heat generated by the pyrolysis furnace, and a pipe that passes through the inside of the pyrolysis furnace, and the heat generated by the pyrolysis furnace. Warm air equipped with a heat exchanger that heats the flowing water in the pipe, an exhaust pipe that discharges the heated air generated in the pyrolysis furnace, and a fan that sucks the heated air from the pyrolysis furnace into the exhaust pipe. A generator has been proposed (see Patent Document 5).

If the wood chips have a high water content and a high viscosity, a large amount of cost is required to dispose of the wood chips. In particular, when hot air is generated from moist wood chips and used for drying treatment to provide a hot water generator by a combustion furnace, the moist wood chips chips are placed in the middle stage of the cylindrical combustion furnace so that they can be sequentially transferred downward. Air is blown into a certain fuel injection hopper while being blown into the fuel, and multiple air blowing ports are provided on the side surface and the bottom of the cylinder in the combustion part so that the air flow is from the bottom of the furnace to the bottom of the fuel in the ascending direction and at the bottom of the furnace. Small size using moist wood chips that are sprayed radially toward the fuel from the inner surface of the furnace to raise the combustion gas and further provide an air blow port at the location of the combustion furnace along the inner wall surface of the furnace. A combustor for a once-through boiler has been proposed (see Patent Document 6).

A combustion device that burns chip-shaped wood fuel, and includes a burner body on which hydrous wood fuel is movably placed by swinging means, a fuel supply means, an ignition means, and an air supply means for supplying air. The burner body is provided with an ash storage container and control means for control, and the burner body is inclined diagonally downward from the front to the rear at an angle of more than 0 ° and within 10 ° to burn wood fuel during combustion. , Chip-shaped wood fuel is supplied onto the burner body by the fuel supply means, the burner is rocked by the rocking means, combustion air is supplied into the burner body by the air supply means, and the wood fuel is supplied on the burner body. A wood fuel combustion device for burning has also been proposed (see Patent Document 7).

As a combustion type generator using conventional biomass fuel, a steam generator with a water heater that uses a certain size and amount of chip or pellet-shaped fuel and can be used in any size, shape, or type can be used. However, there are few combustors that use water-containing bark fuel chips.

Japanese Unexamined Patent Publication No. 5-164314 Japanese Unexamined Patent Publication No. 6-159635 JP-A-2002-356319 Japanese Unexamined Patent Publication No. 2017-122550 JP-A-2017-36883 Japanese Unexamined Patent Publication No. 2014-134372 JP-A-2007-147105

Since it dries by effectively utilizing the heat energy of woody biomass with high moisture content and high water content, it has the advantage of reducing fuel costs. However, this method is extremely difficult to sufficiently dry the wood in an ideal environment. In particular, it is extremely difficult to control both the temperature and the water content to the ideal environment, which is often due to the external environment in which the wood is dried. In addition, since the hydrous woody biomass is incompletely burned, there is a problem that it is difficult to clean the exhaust gas.

Moreover, since the heat energy generated when burning woody biomass is used only for drying wood, it cannot be effectively used for other purposes. There are few proposals for a combustor that uses wood fuel as fuel from the bark of a tree that has been treated as waste containing a large amount of water. The present invention has been developed for the purpose of solving the problem of reducing such fuel costs. The important purpose is to make effective use of the heat energy generated by burning high-moisture bark woody biomass to dry wood extremely economically and use it as fuel. It is an object of the present invention to provide a method of utilizing generated heat by a woody biomass fuel that can be used as a fuel chip for a highly water-containing bark by drying while controlling the temperature to an ideal temperature.

Using 40% or more of the moisture-containing bark chips used in the combustion chamber for boilers as fuel, various bark of different sizes with high moisture content are sequentially conveyed upward by a belt conveyor to the combustion furnace inlet. Sometimes, while controlling the supply amount by attaching a limit to the belt conveyor frame, from the fuel input hopper at the top of the combustion chamber, at the same time, to promote combustion, the shavings are cyclone-typed with air from the middle position of the firing furnace. Put it in,
The fuel is burned while blowing air from several air inlet nozzles in the middle stage of the cylindrical side surface of the cylindrical combustion furnace and a plurality of air inlet nozzles at the bottom of the combustion furnace, and the combustion gas is raised to the upper part. On the inner wall surface of the furnace, the air flow can be blown from the bottom of the furnace to the bottom of the fuel in the ascending direction, and radially toward the fuel and its combustion flame at the bottom of the furnace. It is a combustion device for a small once-through boiler that uses high-moisture bark fuel with an air inlet provided along the combustion furnace.

It is installed on the outer side surface of the cylindrical fuel furnace and is transported from the tank yard for storing highly hydrous bark fuel to the fuel inlet by a belt conveyor, and the fuel inlet has an inlet and an inlet. A variety of deformed fuel chips with different shapes can be dropped from the inlet of the highly water-containing bark chip to the center of the bottom of the furnace at the top of the cylindrical fuel furnace. An air inlet is provided at a certain angle from the air nozzle so that the combustion flame becomes a cyclone state in the middle of the furnace so that the fuel becomes a conical deposit in the combustion state at the bottom of the furnace. It is 700 mm to 2000 mm from the bottom of the body and is located at the center of the furnace body.

In a combustion furnace for a small once-through boiler using high-moisture variant tree bark chips, the crushed chip of high-moisture tree bark fuel is the size of a collection of cypress, fir, and cedar wood waste bark. It has a chip-like shape that falls within the range of 5 mm to 300 mm, and the bark of the tree contains 40% by weight or more of water.

The combustion part of the combustion furnace for small once-through boilers using highly hydrous bark fuel is cylindrical, with inner dimensions of 700 mm to 2500 mm, outer dimensions of 1000 mm to 3000 mm, and height of 1500 mm to 4000 mm, in order to improve combustion efficiency. From the inlet, the fuel, which is shaped like a high-moisture tree bark chip of a variant, is flown through the air and dropped into the center of the furnace, and is sprayed radially onto the inner wall of the furnace and burned in a swirling manner at the center. Air nozzle ports that can be used are installed as 4 to 10 air blow ports in the vertical direction of the cylindrical combustion part, and air blow nozzles are installed at 3 to 8 positions below the tip of the fuel input / introduction port. , Air nozzles are placed at 4 to 6 locations around the side surface of the furnace body so that the air air velocity is 20 m / sec to 60 m / sec and the flow velocity at the center position is in a radial spiral shape with respect to the direction of the center point. At an angle of 20 ° to 40 °, air blow ports are installed at 30 to 70 locations directly below the fuel combustion part of the furnace bottom, and the fuel inlet, furnace side nozzle, and bottom nozzle are used as the ratio of air inflow. The ratio is 25 to 35%: 5 to 15%: 50 to 65%.

The main body of the combustion part that generates hot water sends the combustion gas from the above-mentioned combustion part to the upper part, heats the water preheating part and the boiler part with cross type exchange with heat exchange pipe, and heat exchange of the combustion gas is performed in two stages. A water preheating section that is heated by the heat-exchanged exhaust gas in order to generate high-temperature hot water, and a boiler section with a ventilation function that effectively utilizes the hot air obtained by the heat exchanger. It consists of an exhaust gas treatment unit with a heat exchanger that collects dust in a multi-cyclon with a heat exchanger and discharges it with a chimney.

In a device that supplies a certain amount of fuel from high-moisture tree bark to a combustor, a storage metering device with a transport belt attached to the bottom of the outlet for high-moisture tree bark chips and adjustment of the supply amount of high-moisture tree bark chips. A conveyor belt with a brim that can supply a certain amount to the raw material input port for high-moisture bark chips in a combustor, and a belt conveyor with a brim that can control the supply amount of high-moisture bark chips from the combustion temperature. It is equipped with a high-moisture bark fuel transport and supply unit consisting of a control panel.

In the present invention, the bark of a tree containing a large amount of water is treated at a sawmill as an industrial waste thinned wood at a cost, or the bark of a moist / water-containing bark that is rain-covered wood chips / waste wood. The crushed wood chips are used as fuel while being dried, which has a heat source circulation mechanism and an exhaust heat recovery mechanism, so that further resource saving and pollution-free can be promoted. Moreover, the generated heat source can be used as in-house hot water, hot water, hot air, and steam.

The heat utilization method of the woody biomass of the water-containing / moist tree bark of the present invention makes effective use of the heat energy generated by burning the chips of the bark fuel, and makes the fuel extremely economical before combustion. The method of utilizing the generated heat of hot water and hot water after drying is a feature that makes the crushed material of the bark of the water-containing tree dry while controlling it to the ideal temperature and humidity suitable for combustion, making it an efficient fuel method. There is. In addition, the moistened bark was smoothly supplied from the silo in the storage tank of the bark chips to the combustion furnace.

Overall plan view of a combustion device for a small once-through boiler using highly hydrous bark fuel Overall elevation view of a combustion device for a small once-through boiler using highly hydrous bark fuel Detailed view of the cylindrical combustion furnace (A) Air condition diagram, Detailed view (B) sectional view of a cylindrical combustion furnace

Embodiments of the present invention will be described below with reference to the drawings.
As shown in the system diagram of the apparatus of the present invention in FIG. 1, it is a combustor for a small once-through boiler using a moist wood waste chip provided with a fuel mixing supply unit, a combustion unit, and an exhaust gas treatment unit with a heat exchanger. First, the chips of moist wood chips as fuel are sequentially transferred from the upper stage of the hopper as shown in FIG. 4 to the lower stage, and the fuel is supplied to the combustion furnace.

The supplied fuel is introduced from the middle stage of the cylindrical combustion part, and a plurality of air inlets are provided so that the air flow in the combustion part rises in a spiral shape along the inner wall to promote combustion. An additional air inlet is provided at the location to complete the combustion. The combustion gas is sent to a pipe-shaped heat exchanger to exchange heat with the combustion gas to generate high-temperature hot air and hot water. On the other hand, the heat-exchanged exhaust gas is treated with dust in a multi-cyclone type dust collector with a heat exchanger and discharged by a chimney. It consists of a hot water generator for effective use of the exhaust gas obtained by the heat exchanger.

As shown in FIGS. 1 and 2, using the bark chips of 40% or more of the moisture-containing bark used in the combustion furnace for the boiler as fuel, the bark of the bark containing moisture at the combustion furnace inlet is sequentially moved upward by a belt conveyor. A limit frame is attached at the time of transportation to control the amount of drop supply, and at the same time, by entraining air in a cyclone method, shavings are thrown in to promote combustion, and the fuel is thrown in from the top of the hopper for fuel injection to form a cylindrical combustion furnace. Combustion is performed while blowing air from several air inlet nozzles in the middle stage of the side surface of the cylinder and multiple air outlet nozzles at the bottom of the combustion furnace so that the combustion gas can rise to the upper part. The location of the combustion furnace along the inner wall surface of the combustion furnace so that the air flow can be blown from the bottom of the furnace in the upward direction from the bottom of the fuel and toward the fuel and its combustion flame at the bottom of the furnace in a radial pattern. It was a combustion device for a small once-through boiler that used moist bark fuel with an air inlet.

It is installed on the outer side surface of the cylindrical fuel furnace and is transported from the tank yard for storing moistened bark fuel to the fuel inlet by a belt conveyor. The fuel inlet has an inlet and an inlet. The bark chip fuel can fall from the inlet of the moistened bark chip to the center of the bottom of the furnace at the top of the cylindrical fuel furnace, and the dropped fuel chips are burned at the bottom. An air inlet is provided in the middle of the furnace to blow the combustion flame at a certain angle from the air nozzle so that it becomes a conical deposit, 1500 mm from the bottom of the furnace. It is located at the center of the furnace body.

In a combustion furnace for a small once-through boiler using moist wood bark chips, the crushed product chips of moist wood bark fuel are crushed from cypress, fir, and cedar wood, which are a collection of discarded bark. It has a chip shape of 5 mm to 100 mm and contains 50% by weight or more of water.

As shown in FIG. 3A, the combustion part of the combustion furnace for a small once-through boiler using the bark fuel of a moistened tree is cylindrical, has an inner dimension of 1500 mm, an outer dimension of 2000 mm, and a height of 2500 mm in order to improve combustion efficiency. In addition, an air nozzle port that allows the bark chip-shaped fuel to flow from the inlet to the center of the furnace while being air-flowed and dropped, and then sprayed radially onto the inner wall of the furnace to burn in a swirling manner at the center. Is installed as eight air blow ports in the vertical direction of the cylindrical combustion part, and air blow nozzles are attached to each of the three to eight height points below the tip of the fuel input / introduction port to adjust the air air velocity. At 40 m / sec, air nozzles were set at four locations around the side surface of the furnace body so that the flow velocity at the center position would be in a radial spiral shape, and the angle was 30 ° with respect to the direction of the center point. Air blow ports are installed at 30 locations directly under the fuel combustion section, and the ratio of air inflow is 25%: 25%: 50%, which is the flow rate of the fuel inlet, the furnace side nozzle, and the furnace bottom nozzle. It was.

As shown in FIG. 3B, the combustion unit main body that generates hot water sends the combustion gas from the combustion unit to the upper part to heat the water preheating unit and the cross-type exchange boiler unit with a heat exchange pipe to heat the combustion gas. In order to generate high-temperature hot water in two stages of heat exchange, the water preheating section heated by the heat-exchanged exhaust gas and the ventilation function for effectively utilizing the hot air obtained by the heat exchanger. It consisted of a boiler unit with a heat exchanger and an exhaust gas treatment unit with a heat exchanger that collects dust in a multi-cyclon with a heat exchanger and discharges it with a chimney.

In a device that supplies a certain amount of moist tree bark fuel to a combustor, a storage metering device with a transport belt attached to the bottom of the moist tree bark chip carry-out port and adjustment of the supply amount of moist tree bark chips A conveyor belt with a brim that can supply a fixed amount to the fuel-impregnated bark chip raw material input port of the combustor, and a control panel that can control the amount of chip supply from the combustion temperature. It was equipped with a moisturizing and moisturizing tree bark fuel transport and supply unit.

Similar to the first embodiment, the bark chips containing 42% or more of water used in the combustion furnace for a boiler are used as fuel, and the bark of the bark containing water is sequentially conveyed upward by a belt conveyor to the combustion furnace inlet. At the same time, a limit is attached to control the amount of drop supply, and at the same time, the shavings are thrown in by the accompanying air in a cyclone method to promote combustion, and the fuel is thrown in from the upper part of the hopper for fuel injection to form the cylinder of the cylindrical combustion furnace. Air flow while blowing air from several air inlet nozzles in the middle of the side surface and multiple air outlet nozzles at the bottom of the combustion furnace so that the combustion gas can rise to the upper part. From the bottom of the furnace to the bottom of the fuel in the ascending direction, and to the fuel at the bottom of the furnace and its combustion flame, air can be sprayed radially from the inner surface of the combustion furnace to the location of the combustion furnace along the inner wall surface of the furnace. It was a combustion device for a small once-through boiler that used moist bark fuel with a blow port.

It is installed on the outer side surface of the cylindrical fuel furnace and is transported from the tank yard for storing moistened bark fuel to the fuel inlet by a belt conveyor. The fuel inlet has an inlet and an inlet. The bark chip fuel can fall from the inlet of the moistened bark chip to the center of the bottom of the furnace at the top of the cylindrical fuel furnace, and the dropped fuel chips are burned at the bottom. An air inlet is provided in the middle of the furnace to blow the combustion flame at a certain angle from the air nozzle so that it becomes a conical deposit, 1500 mm from the bottom of the furnace. It was set to the center position of the furnace body.

In a combustion furnace for a small once-through boiler using moist wood bark chips, the crushed product chips of moist wood bark fuel are crushed from the accumulated bark of fir wood to be discarded, and 5 to 5 It had a chip shape of 100 mm and contained 50% by weight or more of water.

The main body of the combustion part that generates hot water sends the combustion gas from the above-mentioned combustion part to the upper part, heats the water preheating part and the boiler part with cross type exchange with heat exchange pipe, and heat exchange of the combustion gas is performed in two stages. A water preheating section that is heated by the heat-exchanged exhaust gas in order to generate high-temperature hot water, and a boiler section with a ventilation function that effectively utilizes the hot air obtained by the heat exchanger. It consisted of an exhaust gas treatment unit with a exchanger that collects dust in a multi-cyclone with a heat exchanger and discharges it with a chimney.

In a device that supplies a certain amount of moist tree bark fuel to a combustor, a storage metering device with a transport belt attached to the bottom of the moist tree bark chip carry-out port and adjustment of the supply amount of moist tree bark chips A conveyor belt with a brim that can supply a fixed amount to the fuel-impregnated bark chip raw material input port of the combustor, and a control panel that can control the amount of chip supply from the combustion temperature. It was equipped with a moisturizing and moisturizing tree bark fuel transport and supply unit.

As shown in FIG. 1, a small once-through boiler combustor having a diameter of 1800 mm and a height of 2500 mm is installed as a fuel injection hopper 12 on the outer side surface of the furnace body of a cylindrical fuel vessel, and has an inlet and an inlet. As shown in FIG. 5, the length of the slope of the silo inlet outside the furnace is 100 mm and the sliding angle is 35 ° so that the moistened chips with 30% by weight or more of water do not adhere to the silo inlet wall surface. In addition, an air inlet that allows air to accompany and flow to the inlet of the chip body is provided at the top of the wall surface of the silo, so that the fuel chip can fall to the center of the furnace body, and the fallen fuel chip is conical at the bottom of the furnace. The tip of the chip introduction pipe portion in the furnace was positioned at 900 mm from the bottom of the furnace body so as to form a shape deposit, and the deposit was located in the center of the furnace body.

As shown in FIG. 2, in a combustor for a small once-through boiler using moist wood chips, the crushed wood chips contain 30% by weight of water, and 1 to 1 of a mixture of sawdust, wood chips, waste materials, etc. The combustion part of the combustor for a small once-through boiler using a 50 mm long chip-shaped moistened wood chips was cylindrical, had an inner dimension of 1500 mm, an outer dimension of 1800 mm, and a height of 2500 mm. Moisture-containing wood chips, which are in the form of chips, were deposited on the bottom of the combustion chamber, and air was sent from the bottom of the deposit by an air nozzle.

As shown in FIG. 3A, in order to improve the combustion efficiency, the fuel of the chip-shaped moist wood chips is partially dried from the inlet and dropped into the center of the furnace together with the air flow to drop the raw material in FIG. At the bottom of the furnace, drying was performed by air flow and heat in a conical deposit state. On the other hand, air is sprayed radially onto the inner wall of the furnace so that it can be burned in a swirling manner at the center. Air nozzles are installed as seven air inlets in the vertical direction of the cylindrical combustion part, and fuel is input. Air blowing nozzles are attached to each of the five heights below the tip of the inlet, and the air air velocity is 70 m / sec, and the flow velocity in the center is in a radial spiral shape around the side surface of the furnace body 5 A combustor for a small once-through boiler was manufactured in which the air nozzles were angled at 13 ° with respect to the direction of the center point, and 20 air inlets were attached directly below the fuel combustion part at the bottom of the furnace.

As shown in FIG. 3B, the once-through boiler main body that generates hot water sends the combustion gas from the combustion part to the upper part to heat the water preheating part and the cross-type exchange boiler part with a heat exchange pipe for combustion. A water preheating unit heated by the heat-exchanged exhaust gas and a blower for effectively utilizing the hot air obtained by the heat exchanger in order to generate high-temperature hot water in two stages of gas heat exchange. It has a boiler part with a function and an exhaust gas treatment part with a switch that collects dust in a multi-cyclon with a heat exchanger and discharges it with a chimney. The overall layout is as shown in FIG.
Hot water was produced from this and supplied to the greenhouse by piping and used for heating. The room temperature was maintained at 35-40 ° C.

The main body of the combustion part that generates hot water sends the combustion gas from the above-mentioned combustion part to the upper part, heats the water preheating part and the boiler part with cross type exchange with heat exchange pipe, and heat exchange of the combustion gas is performed in two stages. A water preheating section that is heated by the heat-exchanged exhaust gas in order to generate high-temperature hot water, and a boiler section with a ventilation function that effectively utilizes the hot air obtained by the heat exchanger. It is an exhaust gas treatment unit with a exchanger that collects dust in a multi-cyclone with a heat exchanger and discharges it with a chimney. Hot water was produced by this.

1 Combustion chamber 2 once-through boiler (with heat exchanger)
3 Cyclone 4 Exhaust fan 5 Air supply fan 6 Combustion chamber outlet Thermometer 7 Flue 8 Ash outlet door 9 Chimney 10 Steam outlet 11 Water supply preheating chamber-Water heater 12 Fuel supply inlet 13 Lower combustion air nozzle 14 Air nozzle 15 Insulation caster 16 Lifting air duct 17 Wood chip 18 Combustion drop angle 19 Air lift (air)
20 Fuel input duct 21 Dry raw material chip 22 Swirling flow wind 23 Refractory brick 24 Sliding angle 25 Repulsion 26 Air blowing nozzle 27 Conveyor 28 Inspection port 29 Water supply pump 30 Water supply tank 31 Metering machine 32 Switchboard 33 Return pipe Z: Drying zone X : Combustion zone Y: Bottom air inlet

Claims (6)

Using 40% or more of the moisture-containing bark chips used in the combustion chamber for boilers as fuel, various bark of different sizes with high moisture content are sequentially conveyed upward by a belt conveyor to the combustion furnace inlet. Sometimes, while controlling the supply amount by attaching a limit to the belt conveyor frame, from the fuel input hopper at the top of the combustion chamber, at the same time, to promote combustion, the shavings are cyclone-typed with air from the middle position of the firing furnace. Put it in,
The fuel is burned while blowing air from several air inlet nozzles in the middle stage of the cylindrical side surface of the cylindrical combustion furnace and a plurality of air inlet nozzles at the bottom of the combustion furnace, and the combustion gas is raised to the upper part. On the inner wall surface of the furnace, the air flow can be sprayed radially from the bottom of the furnace to the fuel at the bottom of the furnace and its combustion flame in the ascending direction from the bottom of the furnace. A combustion device for a small once-through boiler that uses high-moisture bark fuel, which is characterized by having an air inlet at the location of the combustion furnace along the combustion furnace. It is installed on the outer side surface of the cylindrical fuel furnace and is transported from the tank yard for storing highly hydrous bark fuel to the fuel inlet by a belt conveyor. The fuel inlet has an inlet and an inlet. A variety of deformed fuel chips that have different shapes can be dropped from the inlet of the highly hydrous wood bark chip body to the center position of the bottom of the furnace body at the top of the cylindrical fuel furnace. An air inlet is provided at a certain angle from the air nozzle so that the combustion flame becomes a cyclone state in the middle of the furnace so that the fuel becomes a conical deposit in the combustion state at the bottom of the furnace. The combustion device for a small once-through boiler using the highly water-containing bark fuel according to claim 1, wherein the combustion apparatus is located at the center of the furnace body at 700 mm to 2000 mm from the bottom of the body. In a combustion furnace for a small once-through boiler using high-moisture variant tree bark chips, the crushed chip of high-moisture tree bark fuel is the size of the bark of cypress, fir, and cedar wood. The highly hydrated wood according to claim 1 or 2, wherein the wood has a chip-like shape in a range of 5 mm to 300 mm, and the bark of the wood contains 40% by weight or more of water. Combustion device for small once-through boilers using the skin fuel of. The combustion part of the combustion furnace for small once-through boilers using highly hydrous bark fuel is cylindrical with inner dimensions of 700 mm to 2500 mm, outer dimensions of 1000 mm to 3000 mm, and height of 1500 mm to 4000 mm in order to improve combustion efficiency. , The fuel, which is shaped like a high-moisture tree bark chip of a variant, is flown from the inlet to the center of the furnace and dropped, and then sprayed radially onto the inner wall of the furnace and burned in a swirling manner at the center. Air nozzle ports that can be used are installed as 4 to 10 air blow ports in the vertical direction of the cylindrical combustion part, and air blow nozzles are installed at 3 to 8 positions below the tip of the fuel input / introduction port. , The air air velocity is 20 m / sec to 60 m / sec, and the air nozzles are placed at 4 to 6 points around the side surface of the furnace body so that the flow velocity at the center position is in a radial spiral shape with respect to the direction of the center point. At an angle of 20 ° to 40 °, air blow ports are installed at 30 to 70 locations directly below the fuel combustion part of the bottom of the furnace, and the fuel inlet, side nozzle of the furnace, and bottom nozzle are used as the ratio of air inflow. The highly hydrous bark fuel according to any one of claims 1 to 3, wherein the ratio of 25 to 35%: 5 to 15%: 50 to 65% is used. Combustion device for small once-through boilers. The main body of the combustion part that generates hot water sends the combustion gas from the combustion part to the upper part and heats the water preheating part and the boiler part with cross type exchange with heat exchange pipe, and the heat exchange of the combustion gas is heated to two stages. A water preheating section that is heated by the heat-exchanged exhaust gas to generate hot water, a boiler section with a blower function that makes effective use of the hot air obtained by the heat exchanger, and a heat exchanger. The bark fuel of a highly hydrous tree according to any one of claims 1 to 4, wherein the exhaust gas treatment unit with a exchanger collects dust in the multi-cyclone and discharges the dust in the chimney. A combustion device for small once-through boilers using. In a device that supplies a certain amount of fuel from high-moisture tree bark to a combustor, a storage metering device with a transport belt attached to the bottom of the outlet for high-moisture tree bark chips and adjustment of the supply amount of high-moisture tree bark chips. A conveyor belt with a brim that can supply a certain amount to the raw material input port of the bark chips of high water content of the combustor, and a belt conveyor with a brim that can control the supply amount of bark chips of high water content from the combustion temperature. The highly hydrous tree bark fuel according to any one of claims 1 to 5, which is provided with a transport and supply unit for a highly hydrous tree bark fuel including a control panel. Combustor for small once-through boilers.

Images