CN201093842Y - Wood drying machine - Google Patents

Abstract

The utility model discloses a wood drying machine, its technical scheme's main points are, its pressure vessel that can seal including having the door is equipped with the inner baffle that separates pressure vessel for the dry chamber and the heat transfer chamber of mutual intercommunication in pressure vessel the heat transfer intracavity be equipped with the heater be equipped with circulating fan between dry chamber and the heat transfer chamber, be equipped with on pressure vessel with the communicating relief valve in the external world, be equipped with the heat sink on pressure vessel. The utility model aims at overcoming the conventional drying equipment energy consumption of timber among the clothes prior art higher to and the normal pressure high temperature drying easily leads to great moisture content gradient and then easily produces not enough of drying defects such as fracture, shrink, provide one kind can carry out drying or high temperature heat treatment with timber under the pressure environment that is higher than the normal pressure, difficult messenger timber leads to great moisture content gradient and stress, ensures the timber drier of ligneous drying mass and efficiency.

Description

a wood dryer

【Technical field】

The utility model relates to a wood drying device, more specifically a wood drying machine.

【Background technique】

At present, the known wood drying methods can be divided into three categories: mechanical drying, chemical drying and thermal drying, among which the thermal drying method is the most commonly used. A conventional wood dryer is composed of a shell, a heater, a circulating fan, and an intake and exhaust device. The general drying process is to stack the wet wood reasonably first, then put it into the shell of the dryer, and then through the mutual cooperation of the internal equipment of the dryer, an artificial environment is created to make the wood change from wet to dry. Conventional drying usually uses humid air of 0.1MPa under normal pressure as the drying medium. During the drying process, whether it is the water evaporated from the wood, or according to different drying process stages: preheating treatment, intermediate treatment, balance treatment and After the final treatment, the water vapor added to the drying body is exhausted through the air intake and exhaust devices on the body. Therefore, the exhaust heat loss is large and the energy consumption is high. In the conventional drying process, the air temperature, relative humidity and air velocity are generally used as the "three elements" to control the wood drying process. Atmospheric pressure and high temperature drying has slow drying speed, high cost, and insufficient dimensional stability. It cannot maintain a high equilibrium moisture content, which can easily cause large moisture content gradients and stresses in wood, and cannot ensure the drying quality and efficiency of wood. However, in the external factors that affect the movement of moisture inside the wood and the intensity of surface evaporation, the pressure of the surrounding air is also a decisive factor, so it is necessary to have a method that fully considers the influence of external pressure. machine.

【Content of utility model】

The purpose of the utility model is to overcome the disadvantages of high energy consumption of conventional wood drying equipment in the prior art, and that drying under normal pressure and high temperature can easily lead to a large moisture content gradient and thus easily produce drying defects such as cracking and shrinkage, and provides a It is a kind of wood drying machine that can dry wood under a pressure environment higher than normal pressure or heat treatment at high temperature, which is not easy to cause a large moisture content gradient and stress in wood, and ensures the drying quality and efficiency of wood.

The utility model is achieved through the following technical solutions:

A kind of wood drying machine is characterized in that: it comprises a sealable pressure vessel with a door, and an inner partition that separates the pressure vessel into a drying chamber and a heat exchange chamber that are connected to each other is arranged in the pressure vessel, and in the A heater is provided in the heat exchange chamber, a circulation fan is provided between the drying chamber and the heat exchange chamber, a safety valve communicating with the outside is provided on the pressure vessel, and a cooling device is provided on the pressure vessel.

A wood dryer as described above is characterized in that the cooling device includes a heat exchanger arranged on the side of the air inlet of the circulating fan, and the medium in the heat exchanger is water or oil.

A wood dryer as described above is characterized in that the cooling device further includes an air inlet on one side of the pressure vessel and an air outlet on the other side.

A wood dryer as described above is characterized in that an exhaust condensing device is connected outside the safety valve, the exhaust condensing device includes an exhaust condenser and a liquid collector, the inlet of the exhaust condenser and the outlet of the safety valve The outlet is connected.

A wood drying machine as described above is characterized in that the bottom of the drying chamber is provided with a track for the entry and exit of the wood transport trolley.

A wood dryer as described above is characterized in that the pressure vessel is provided with a water vapor inlet.

A wood dryer as described above is characterized in that the cross-section of the pressure vessel is circular, and the inner partition divides the inner chamber of the pressure vessel into an arc-shaped heat exchange chamber and a square drying chamber.

A wood dryer as described above is characterized in that the circulating fan is a volute-less centrifugal fan, and a mechanical sealing device is provided between the fan impeller shaft and the pressure vessel.

A wood dryer as described above is characterized in that a discharge valve is provided at the bottom of the pressure vessel.

A wood dryer as described above is characterized in that an insulating layer is sandwiched in the container wall of the pressure vessel.

Compared with the prior art, the utility model has the following advantages:

1. The utility model adopts a pressure vessel. During the entire pressure drying process, the moisture evaporated from the wood does not need to be discharged by means of ventilation, and can maintain a relatively high equilibrium moisture content under pressurized high temperature conditions, which is not easy to use Wood leads to a large moisture content gradient and stress, so that the moisture in the wood is vaporized and evaporated at a relatively high temperature, so as to achieve the purpose of high-quality and fast drying. Lower gas loss.

2. The utility model is equipped with an exhaust condensing device, which can effectively condense and collect the organic volatiles produced during the high-temperature drying process, reducing the discharge of organic matter and heat pollution during the drying process.

【Description of drawings】

Fig. 1 is a schematic diagram of a vertical section of the utility model;

Fig. 2 is the utility model airflow schematic diagram;

Fig. 3 is a schematic cross-sectional view of the utility model;

Fig. 4 is a schematic cross-sectional view of the utility model.

【Detailed ways】

A wood drying machine, which comprises a sealed pressure vessel 1 with a door 16, and an insulation layer 106 is sandwiched in the vessel wall of the pressure vessel 1. Inside the pressure vessel 1, there is an inner partition 2 that separates the pressure vessel 1 into a drying chamber 101 and a heat exchange chamber 102 that communicate with each other. The cross section of the pressure vessel 1 is circular, and the inner partition 2 separates the pressure vessel 1. The inner chamber is divided into three arc-shaped heat exchange chambers 102 and a square drying chamber 101. A heater 3 is provided in the heat exchange chamber 102, a circulation fan 4 is provided between the drying chamber 101 and the heat exchange chamber 102, and a safety valve 5 communicating with the outside is provided on the pressure vessel 1 and cooling device 6. The cooling device 6 includes a heat exchanger 7 arranged on one side of the air inlet of the circulating fan 4, and the medium in the heat exchanger 7 is water or oil. The cooling device 6 also includes an air inlet 103 on the bottom side of the pressure vessel 1 and an air outlet 104 on the top side. The safety valve 5 is externally connected with an exhaust condensing device 8 , which includes an exhaust condenser 9 and a liquid collector 11 , and the inlet of the exhaust condenser 9 is connected to the outlet of the safety valve 5 . The bottom of the drying chamber 101 is provided with a track 12 that can be used by a trolley for transporting materials. The pressure vessel is provided with a water vapor inlet 105 . The circulating fan 4 is a volute-less centrifugal fan, and a mechanical sealing device 13 is provided between the fan impeller shaft and the pressure vessel 1 . The bottom of the pressure vessel 1 is provided with a discharge valve 14, and the top is connected with a pressure gauge 15.

Inside the pressure vessel 1, there is a partition plate 2 with a cross-section approximately square to divide the inside of the pressure vessel 1 into a drying chamber 101 and a heat exchange chamber 102. There is no less than one wood transport trolley 17 in the drying chamber 102 to facilitate the entry and exit of wood. ; The heater 3 is divided into three groups of upper, left and right, respectively located in the upper, left and right three heat exchange chambers.

Firstly, the wood to be treated is placed on the carrier trolley 17 by vertically leaving space stacking method or by drilling every other bar code, and then the carrier trolley 17 is pushed into the drying chamber 101, and the door 16 is closed. According to the specific situation of the rate, first open the water vapor inlet 105 located at the top of the pressure vessel 1, close the water vapor inlet 105 after introducing an appropriate amount of water vapor, start the circulation fan 4, and pass the heat medium such as heat transfer oil or water into the heater 3, Driven by the circulation fan 4, the steam medium in the body obtains heat at the heater 3, and then transfers the heat to the wood to be treated by convective heat exchange, and at the same time, the water evaporated from the wood is taken out. material stack; along with the drying process, the temperature and water vapor pressure of the medium in the pressure vessel 1 will continue to rise, when the internal pressure exceeds the set value of the safety valve 5, the excess high-temperature steam will be released from the pressure of the safety valve 5 outlet, and enter the exhaust condenser 8 to condense, and the liquid product obtained after condensation is collected by the liquid collector 11; the condensed water accumulated at the bottom of the pressure vessel 1 during the drying process can be opened by opening the The discharge valve 14 is excluded; the specific treatment temperature and environmental pressure of wood will be determined according to the specific conditions of the wood to be treated and the drying quality requirements and other factors. Between MPa; after the treatment process is finished, close the heat medium valve, and first activate the water cooling or oil cooling cooling device 6, driven by the circulating fan 4, the heat transfer method based on convective heat exchange will quickly cool down, when the pressure When the temperature in the container 1 drops to 80-90°C, open the water vapor inlet 3 located at the top of the pressure container 1 again and let in an appropriate amount of water vapor to balance the wood so as to adjust the final moisture content of the wood and release Drying stress, after the balance process is completed, open the air inlet 103 at the bottom of the pressure vessel 1 and the air outlet 104 at the top of the pressure vessel 1, that is, start the air cooling system to cool down. When the temperature dropped to 30-50°C, the door 16 was opened to unload the treated wood, and then the treatment process was completed.

Claims (10)

1. wood dryer, it is characterized in that: it comprises the sealable pressure vessel (1) that has door (16), in pressure vessel (1), be provided with pressure vessel (1) is divided into the drying chamber (101) that is interconnected and the internal partition (2) of heat exchanging chamber (102), the heater (3) that in described heat exchanging chamber (102), is provided with, between described drying chamber (101) and heat exchanging chamber (102), be provided with circulating fan (4), on pressure vessel (1), be provided with and the extraneous safety valve (5) that communicates, on pressure vessel (1), be provided with heat sink (6).

2. a kind of wood dryer according to claim 1 is characterized in that described heat sink (6) is included in the heat exchanger (7) that circulating fan (4) air inlet one side is provided with, and the medium in the described heat exchanger (7) is water or oil.

3. a kind of wood dryer according to claim 2 is characterized in that described heat sink (6) also comprises the air intake (103) that is arranged on pressure vessel (1) one side and the air-out (104) of opposite side.

4. a kind of wood dryer according to claim 1, it is characterized in that described safety valve (5) is externally connected with exhaust condensing unit (8), exhaust condensing unit (8) comprises vent condenser (9) and liquid header (11), and the inlet of vent condenser (9) links to each other with the outlet of safety valve (5).

5. a kind of wood dryer according to claim 1 is characterized in that described drying chamber (101) bottom is provided with the track (12) that can supply cart-load of woods dolly to pass in and out.

6. a kind of wood dryer according to claim 1 is characterized in that described pressure vessel is provided with steam entry (105).

7. a kind of wood dryer according to claim 1 is characterized in that described pressure vessel (1) cross section for circular, and internal partition (2) is divided into the inner chamber of pressure vessel (1) heat exchanging chamber (102) and a square drying chamber (101) of 3 arcs.

8. a kind of wood dryer according to claim 1 is characterized in that described circulating fan (4) is no scroll casing type centrifugal blower, is provided with mechanically-sealing apparatus (13) between draught fan impeller axle and the pressure vessel (1).

9. a kind of wood dryer according to claim 1 is characterized in that described pressure vessel (1) bottom is provided with drain valve (14).

10. a kind of wood dryer according to claim 1 is characterized in that accompanying heat-insulation layer (106) in the chamber wall of described pressure vessel (1).

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