KR20020083413A - VOC omitted - Google Patents

Abstract

PURPOSE: A system for removing VOCs by burner flame at high temperature is provided which reduces exchange cost of activated carbon by installing an adsorption unit at an ordinary adsorption column, and improves removal performance by adopting high temperature combustion process. CONSTITUTION: The system for removing VOCs by burner flame at high temperature comprises a painting booth(1), a feed fan(3) for feeding air and supplying drying heat, a damper(301) for opening and closing a feed entrance, burner(401) for supplying drying heat, a heat exchanger(4) for supplying drying heat, a burner combustion gas chimney(402), a drying hot air circulation duct(9), a damper(901) for opening and closing the circulation duct(9), an exhaust fan(6), an exhaust gas chimney(7), an adsorption column(5) in which adsorbent such as activated carbon and carbon fiber mat is filled in each of chambers, dampers(501A,501B,501C) for opening and closing entrance of each chambers, a damper(502) for opening and closing exit of each chambers, a dried gas exhaust pipe(801) that is a passageway for exhausting dried gas, a dried gas open-and-shut damper(804), a burner combustion air inlet chamber(403), a burner(401) for burning VOCs contained in combustion air, a removable hot air fan(10) for sucking in hot waste gas exhausted from a burner combustion gas chimney, a removable hot air inlet pipe(802), removable hot air open-and-shut dampers(805A,805B,805C), a removable hot air discharge pipe(803) for sensing the VOCs contained air to a burner combustion chamber, and a combustion chamber injection pipe(806).

Description

VOC removal device for high temperature decomposition by burner flame {omitted}

Exhaust gases emitted from various facilities, such as paint booths and drying furnace facilities, contain volatile organic compounds (VOCs) such as toluene and xylene, which are emitted into the atmosphere, causing air pollution. .

In order to prevent air pollution due to such VOCs, various types of purification facilities are used, but most of them use the most economical and efficient activated carbon adhesion method as shown in FIG. 1 and FIG.

However, activated charcoal is saturated when VOC is attached to a certain amount, so it can not be attached anymore, so it can be replaced at regular intervals or recently used hot air as shown in FIG. It adopts the method of being used again after desorption and regeneration. (Figure 2 has already been registered by the inventor of utility model (0207663) and technology evaluation)

The present invention has been invented for application to automotive paint booths or drying furnaces that only paint and dry in one booth.

In the case of automotive paint booth, a desorption method using hot air similar to that of FIG. 2 has recently been applied. However, as shown in FIGS. 4 and 5, desorption and desorption by using waste heat of burner exhaust gas for dry heat supply are shown. VOC is directly put into the burner combustion chamber and VOC can be decomposed and regenerated by the hot gas around the burner flame to enable activated carbon desorption and regeneration without a separate desorption device. As a result, VOC is effectively removed at a low facility cost and operation cost. Even in the case of VOC, the VOC generated by drying is used as burner combustion air, and thus VOC is burned and decomposed by burner flame, and thus, VOC is removed without a separate VOC removing device (generally, a suction tower). To effectively remove the VOC.

In order to explain the system of the present invention, the activated carbon adhesion method and the catalytic combustion method will be described as follows.

(1) Activated carbon adhesion method

Activated carbon has many fine pores and a large surface area. When VOCs with high molecular weight such as benzene, toluene, and xylene gas pass through the activated carbon layer, organic gas molecules are introduced into the micropores by van der Waals forces. It is condensed in a condensed state by maintaining a high concentration. This cohesion characteristic means that the VOC continues to be stuck and has a limited characteristic that it can no longer be stuck when saturated. This means that when all activated carbon in the tower is saturated, it can no longer remove the VOC. It must be replaced or removed and reused.

The desorption process for desorption and reuse of activated carbon may be performed by applying hot air or steam of 100 ° C. or higher because the activated carbon micropores are restored to their original state by being evaporated and desorbed by hot air having a boiling point above the boiling point of activated carbon in the liquid phase.

(2) catalytic combustion method

The catalyst is made of platinum, palladium, etc. It does not participate directly in the reaction itself, but lowers the activation energy of the reactants to promote the reaction, so it is burned at 150 ~ 350 ℃, much lower than the combustion oxidation temperature of 600 ~ 800 ℃ of VOC It is a substance that enables oxidation and saves energy. The catalytic combustion method is a method of using such a catalyst to raise the temperature to 150 ~ 350 ℃ capable of combustion decomposition through the catalytic layer to remove the combustion by the reaction scheme is as follows.

As shown in the above reaction, when decomposing VOC in the catalyst bed, the gas temperature is increased by self-oxidation heat, and the degree of increase is proportional to VOC concentration. Higher efficiency enables more than 95% high efficiency

(3) Operation condition

(A) Automobile paint booth

As shown in FIG. 1, the painting work and the drying work after the painting are performed in the closed coating booth 1, and the painting work is performed by the operator using a spray gun, and the air supply fan inlet damper 301 is considered in consideration of the workplace environment. It is configured to operate the air supply fan 3 and the exhaust fan 6 while opening the circulation duct damper 901 and ventilate.

At this time, the amount of exhaust gas increases as the size of the booth becomes larger in relation to the working environment, but in the case of an automobile paint booth, an exhaust air volume of about 400㎥ / minute is required.

Air pollutants include paint mist that is scattered during spray painting and VOCs from the evaporation of paint solvents during the painting process are exhausted.

After the painting operation, the painted paint drying process is performed. The drying temperature is generally dried at 80 ° C.

In the drying operation, if the air supply fan inlet damper 301 is closed and the circulation duct damper 901 is opened, the air supply fan 3 is operated and the burner 401 is operated. After being heated by burner heating heat again, it is operated by circulation drying method that flows into the booth.

Since the amount of exhaust gas is circulated during drying, only a small amount is discharged to the stack (7), and the volume of the volume is expanded and the amount of VOC evaporation is emitted as the air in the booth rises from room temperature to 80 ° C.

(B) by drying

The drying furnace is a facility that performs only the drying work, unlike the automotive painting booth, which alternates painting and drying. The drying process is the same as the automotive painting booth drying process, and the VOC generation process is the same.

In FIG. 3, when the air supply fan inlet damper 301 is closed, the air supply fan 3 is operated, and the burner 401 is operated, dry hot air flows into the booth and is heated by the burner heating heat again through the circulating duct and then flows into the booth. It is operated by circulation drying method.

Since the amount of exhaust gas is circulated during drying, only a small amount is discharged to the vent 201. The discharge amount is about the volume expansion and VOC evaporation amount as the air in the booth rises at room temperature.

(3) Overview of previous VOC treatment methods

(A) In case of car booth

In the treatment of this VOC discharge facility, the conventional technology can be treated as follows.

1) Non-removable hopping method (figure 1)

As shown in FIG. 3, the activated carbon is charged in a simple container in the simplest manner, and then the VOC is passed through to remove the adhesion, and thus the structure is simple and the equipment cost is low.

However, this method has two major problems.

First, there is a problem that the replacement cost of activated carbon is excessive because it is a simple device without a desorption and regeneration device, so that activated carbon must be replaced when saturated with continuous hop attachment.

If 5000 liters of paint is used per year, the evaporation amount of solvent is 2500-3000kg, so the activated carbon amount is 8500-10000kg and the replacement cost is about 8,500,000-10,000,000 won.

Second, the VOC discharged during drying has a problem that the overall VOC removal performance is lowered because the temperature is high at 80 ℃ is discharged in a state that most of the tower is not removed.

That is, during drying, a small amount of high concentration of gas is stacked due to volume expansion and VOC evaporation gas amount and air leaking from the air supply fan inlet damper 301 due to the temperature of the air in the booth rising to 80 ° C. due to the drying heat. At this time, the VOC is discharged without being removed from the hopping tower 5 because the gas temperature is high at 80 ° C. (For reference, the activated carbon hopping is sharply degraded when the temperature exceeds 40 ° C.)

2) 1 tower-type hop attachment and detachment type hop attachment tower (Fig. 2 method: the present inventors have already registered a utility model; Registration No.-0207663)

This method is to improve the problems of the first method, the activated carbon adhesion treatment when drying, the drying treatment VOC in the catalytic combustion device (8) when drying, and using the heat of decomposition generated during catalytic combustion The activated carbon of 5) is desorbed and regenerated, and at the same time, the VOC generated during desorption is also removed by the catalytic combustion device (8).

This will be described in detail as follows.

In general, activated carbon hobbing is condensed and attached to the surface of activated carbon as VOC gas introduced into the micropores by van der Waals force from micropores becomes lower as gas temperature becomes lower. That is, the lower the gas temperature, the better the adhesion. However, if the gas temperature rises above 40 ° C, the VOC saturation vapor pressure in the micropores rises, and the VOC condensation is not well achieved. Therefore, the adhesion efficiency begins to drop sharply and the gas temperature does not occur at all above the VOC boiling point. In addition, if there is a VOC chewed on the activated carbon layer, the VOC on the surface of the micropores is evaporated to desorption.

Taking advantage of this, when constructing the system as shown in Fig. 2, when the dry gas containing a large amount of VOC dried and exhausted from the coating booth is heated up to 200 ° C. and passed through the activated carbon layer, the VOC contained in the dry gas is not stuck at all. Rather, the VOC desorbed during painting is desorbed, and the generated VOC and the VOC contained in the air-dry gas are treated together in a combustion catalyst device, thereby allowing perfect processing with one hop tower.

Hereinafter, the technical configuration will be described in detail with reference to the accompanying drawings.

In FIG. 2, during the painting operation, the air supply fan inlet damper 301 and the suction tower inlet opening / closing damper 501 and the outlet opening / closing damper 502 are closed when the opening and closing damper 901 of the circulation duct is blocked. If the air supply fan 3 and the exhaust fan 6 are operated while the dry gas opening / closing damper 804 and the removable hot air opening / closing damper 805 are closed, outside air flows into the air supply primary filter to ventilate the interior of the paint booth. It is exhausted to the stack 7 via the post hoc tower.

At this time, the paint mist generated during the coating is removed from the exhaust primary filter and the exhaust secondary filter, and the VOC generated during the coating is removed from the adhesion tower 5.

In the drying operation, the circulation duct opening / closing damper 901 is opened during drying, and the air supply fan inlet opening and closing damper 301, the hop tower inlet opening and closing damper 501 and the outlet opening and closing damper 502 are closed, and the drying gas opening and closing damper 804 is removed from the drying gas. When the heaters of the air supply fan 3, the desorption hot air fan 10, and the catalytic combustion device 8 are operated while the hot air open / close damper 805 is opened, a large amount of hot air containing dry heat flows into the upper part of the booth and is lowered. After drying, the circulating duct (9), air supply fan (3) through the combustion heat supply device (4) is circulated back to the line consisting of inflow into the booth and discharged VOC during drying by the suction of the desorption hot air fan (10). The dry exhaust gas contained therein is passed through the dry gas exhaust pipe 801 through the outside of the heat exchange tube of the heat exchanger at the rear of the heat exchanger, through the activated carbon in the tower, and through the desorption hot air switch damper 805 and the catalytic combustion device 8. It is exhausted to the stack 11 through the inside of the tube.

At this time, when the exhausted gas flows into the catalytic combustion device with the VOC containing the VOC, the gas temperature rises rapidly by the heat of the heater of the catalytic combustion device and is decomposed and removed from the catalyst layer. After heating, the discharged and newly introduced air is heated to increase the temperature, thereby starting the desorption process in the adhesion layer. After a certain period of time, the catalyst decomposes VOCs generated during drying and VOCs generated during desorption while supplying desorption heat by the heater supply heat as the heat of decomposition of VOCs generated by drying in the booth and VOCs generated by desorption of activated carbon. The combustion elimination process is repeated to operate while maintaining parallelism to the temperature state shown in FIG.

This method is the most suitable method developed so far because of its high efficiency and low operating cost due to regeneration of activated carbon.

(B) In case of drying furnace

1) Non-removable hopping method (figure 3)

In the case of a drying furnace, as shown in FIG.

However, unlike the car paint booth, since it is always discharged to the hot gas, by using the cap-type hood 202 to hop in with the ambient air together with the gas discharged to the vent 201, the high-temperature gas of 80 ℃ lowered to 40 ℃ or less Is configured to eliminate sticking.

However, in the case of this method as well, the activated carbon is saturated due to continuous adhesion of the VOC as in the case of FIG.

The present invention considered the following technical problem.

(1) Application of low operating cost by installing desorption device in general hobbing tower by reducing activated carbon replacement cost

(2) When drying, it adopts high temperature combustion method, not activated carbon adhesion method, and high efficiency removal.

(3) Invention of low cost of additional equipment by allowing combustion treatment and desorption equipment to dry as simple piping facilities as existing facilities without additional facilities.

Paragraph (1) (2) is similar to the recently developed method of FIG. 2, but the core of the present invention is referred to (3) as the technical problem of the present invention.

1 is a flow chart of the non-removable adhesion method of the automotive coating booth

2 is a flow chart of a hopping method with a catalytic combustion device desorption device for an automobile paint booth

3 is a flow chart of the non-removable hopping method of the drying furnace.

4 is a flow chart of a hopping method in which a combustion chamber direct injection type detachment device of an automobile paint booth is attached.

5 is a flowchart of a combustion air injection type VOC removal device of a drying furnace

* Explanation of symbols for main parts of the drawings

1 ... coating booth 2 ... by drying

201 ... vent 202 ... capped hood

3.Air supply fan 301 ... Air inlet opening and closing damper

4 ... dry heat supply heat exchanger 401 ... dry heat supply burner

Burner Combustion Flue 403 Burner Combustion Air Hop Inlet Chamber

5 ... Hop-Top Tower 501 ... Hop-Top Tower Opening and Closing Damper

502 ... Hot Top Exit Opening Damper 6 ... Exhaust Fan

7.Exhaust stack 8 ... Catalyst combustion device (small capacity)

801 dry gas exhaust pipe 802 removable hot air inlet pipe

803 Desorption hot air discharge pipe

805 Desorption hot air opening and closing damper

9 ... dry hot wind circulation duct 901 ... dry hot wind circulation duct opening and shutting damper

10.Desorption hot air fan (for drying furnace: dry gas exhaust fan)

11.Dry gas exhaust stack

The present invention is to be applied to a facility that only drying, such as an automobile paint booth, and a facility for drying only, such a facility is equipped with a burner facility for supplying dry heat.

In case of automobile paint booth, combustion gas is burned by burner flame using exhaust gas containing VOC generated during drying as burner combustion air,

It is configured to remove the high temperature burner exhaust gas and desorb the activated carbon of the hopping tower with the waste heat contained therein, and inject hot air gas containing VOC discharged into the burner combustion chamber to perform combustion decomposition treatment by hot gas around the burner flame. . Here, the hop tower structure is designed as a structure in which a plurality of well-heated chambers are connected in parallel so that sufficient desorption is achieved with a limited amount of desorption heat. And not only activated carbon as a cohesive agent, but also activated carbon woven with carbon fibers can be used.

Unlike automobile paint booths, the drying furnace that only performs the drying operation is configured to burn and decompose the burner flame by using the exhaust gas containing VOC generated during drying as burner combustion air.

The former can perform dry flue gas treatment and desorption simultaneously without a separate desorption device, and the latter can remove VOCs without a separate VOC removal device.

Hereinafter, with reference to the accompanying drawings, Figure 4 and Figure 5 will be described in detail the technical configuration for achieving the object of the present invention.

4 is applied to a facility in which painting and drying work alternately in one booth, such as an automobile paint booth. During painting, the opening and closing damper 901 of the circulation duct 9 is closed during drying to block the circulation duct. With the air supply fan inlet opening / closing damper 301 and the hopping tower inlet / outlet opening / closing damper 501A / B / C, 502 open, the dry gas opening / closing damper 804 and the desorption hot air opening / closing damper 805A / B / C closed. When the air supply fan 3 and the exhaust fan 6 are operated, outside air flows into the air supply primary filter to ventilate the interior of the paint booth, and then exhaust the exhaust air to the stack 7 through the attachment tower.

At this time, the paint mist generated during the coating is removed from the exhaust primary filter and the exhaust secondary filter, and the VOC generated during the coating is removed from the attachment tower 5.

During the drying operation, the circulation duct damper 901 is opened during drying, and the air supply fan inlet opening and closing damper 301, the hopping tower inlet opening and closing damper 501A / B / C, and the outlet opening and closing damper 502 are removed and the desorption hot air opening and closing damper 805 is provided. ) Open the 805A at first, open the 805B at the second drying operation, open 805C at the third drying operation, and open the air supply fan (3) and the desorption hot air fan (10) sequentially. A large amount of hot air flows into the upper part of the booth and is exhausted to the lower part. After drying, the hot air flows into the booth again through the circulating duct (9) and the air supply fan (3) and the combustion heat exchanger (4).

The VOC discharged during drying is introduced into the burner combustion air hop inlet chamber 403 through the dry gas exhaust pipe 801 when the dry gas opening / closing damper 804 linked with the burner 401 is opened and burned by the burner flame. Decomposed and removed,

Activated carbon desorption is a desorption hot air opening / closing damper (850A / B / C) installed in each chamber with hot air gas of 250 ° C. or higher coming out of the combustion exhaust gas stack 402 through the desorption hot air inlet pipe 802 by the suction of the desorption hot air fan 10. ) Open in order and desorption through the activated carbon layer in the chamber for each chamber of the hopper tower (5) and the VOC discharged upon desorption through the desorption hot air discharge pipe (803) through the combustion chamber injection pipe (806) heat exchange heat exchange The gas is introduced into the combustion chamber located in the gas 4, and is burned and removed by the hot gas around the flame, and then exhausted to the combustion gas exhaust stack 402.

For reference, the reason for the configuration of the plurality of chambers in FIG. 4 is described in more detail. In FIG. 2, the desorption system is deactivated during operation. Therefore, the desorption apparatus can be supplied for a long time (more than 3 hours) until sufficient desorption is performed. 4 but the desorption is limited to the drying time 20 to 40 minutes, so in some cases the amount of heat desorption may be insufficient.

Desorption heat for desorption of activated carbon can be largely divided into heat dissipation into VOC evaporation, heat dissipation for activated carbon heating and casing. The first is about 10-20% and the second is about 60%. The third is 20-30%, and the amount of desorption heat by VOC self-evaporation is only a fraction.

Therefore, in order to achieve sufficient desorption with limited desorption heat amount, it is necessary to minimize the heat amount and heat loss required for heating activated carbon.

The amount of heat required for heating activated carbon is proportional to the amount of activated carbon. The amount of activated carbon is the sum of the amount necessary for VOC adhesion and the amount required for formation of a hop adhesion to maintain the required adhesion efficiency.

For example, when the amount of paint used for the first time of painting is 3 kg and 2 kg of VOC emissions, the amount of activated carbon required for VOC adhesion is 10 kg, the second exhaust air volume is 400 ㎥ / min, and the activated carbon bed flow rate is 1 m / sec. When the hopper thickness required for maintaining 90% efficiency is 0.05 m, the activated carbon amount is 170 kg (0.34 m3).

In case of desorption after painting once, activated carbon is 10 + 170 = 180 kg

Activated carbon amount is 30 + 170 = 200 kg

Activated carbon amount is 300 + 170 = 470 kg

This is necessary.

At present, the activated carbon amount is 180 kg since it is desorbed at every drying in the fourth degree method. In this case, the amount of desorption calories required is about 200 kcal of VOC evaporation + 2500 kcal of calorie heating calorie + 1300 kcal of heat loss heat = about 4000 kcal, whereas the amount of desorption calories that can be supplied is about 2000 kcal (based on 20 minutes of drying time). Able to know.

In order to solve the shortage of desorption heat, several (normally three) independent chambers sufficiently heated in parallel, such as the hop tower 5 shown in FIG. Open / B / C, 502) opens and closes the exhaust air through all the chambers, but when it is removed, the hot air opening / closing dampers are sequentially removed for each chamber with the inlet / outlet opening / closing dampers (501A / B / C, 502) closed. (805A / B / C) is opened sequentially to remove only one chamber.

Then, for example, the reason why the amount of heat of desorption is small when several chambers are installed is as follows.

When three chambers are installed, the desorption in each chamber is carried out after painting three times, so the total amount of activated carbon is 200 kg, the amount of activated carbon per chamber is 67 kg, and the amount of desorption heat is 200 kcal (200 * times / 3 chamber). ) + Activated carbon heating calorie 830 kcal (2500/3) + heat loss calorie 200 kcal (sufficient warmth) = about 1230 kcal, which is lower than 2000 kcal of desorption supply, so sufficient desorption is possible.

In the case of the drying furnace shown in FIG. 5, it is simpler than an automobile coating booth because only the VOC generated during drying is treated without an activated carbon desorption process.

In FIG. 5, when the air supply fan 3 is operated and the burner 401 is operated while the initial air supply fan inlet opening / closing damper 301 is closed, dry air is supplied while drying heat is supplied.

During drying, a small amount of vent gas is released to the vent 201 by volume expansion and VOC evaporation and LEAK of the supply fan inlet damper. The dry exhaust gas line damper 804 connected to the burner and interlock is At the same time, the dry gas exhaust fan 10 is operated to send a large amount of VOC-containing gas exhausted to the vent 201 to the burner combustion air, and VOCs that enter the burner combustion air chamber 403 are burned by the flame of the burner. It is a facility configured to exhaust to the stack 402 in a removed state.

When installing the device (Figs. 4 and 5) of the present invention as a device that processes VOCs generated from a facility or a drying furnace alternately painting and drying, such as an automobile paint booth, installation cost and operation cost In addition, the economic efficiency, which is represented by, is greatly improved, and the VOC removal efficiency is also burned and decomposed in a high-temperature flame, thereby enabling high efficiency removal.

The effects of this system are described by dividing the facilities into alternating facilities such as paint booths and drying facilities.

For car paint booth

First, in the case of the simple hop tower shown in FIG. By enabling desorption without the desorption device, not only the equipment cost can be drastically reduced, but also the existing 2nd degree system recovers about 50% of the heat with the heat exchanger, but the remaining heat is supplied by operating the heater of the catalytic combustion device. In the case of FIG. 4 according to the present invention, power costs are additionally consumed, but by using waste heat to remove and remove from the burner combustion chamber without a separate heating device, the operating cost is also drastically reduced.

Secondly, the catalytic combustion method of FIG. 2 also increases the catalyst bed inlet temperature and thus removes high efficiency by more than 90%. However, the present invention is almost completely CO ₂ because VOC is introduced into the combustion air and burned by the hot gas around the flame. It is decomposed into H ₂ O and high efficiency (more than 99%) can be removed, thereby increasing the removal efficiency.

Third, energy recovery is possible because the VOC contained in the combustion air is used as drying heat by generating decomposition heat as it burns and decomposes around the flame of the burner. In fact, the heat of VOC decomposition is almost the same as that generated by burning the paint solvent, so the energy recovery effect is very high, and the burner fuel cost can be reduced.

In the case of drying furnace, VOC generated during drying by simple pipe without burner VOC removal facility like hob tower 5 is burned by burner combustion air to burn and decompose into flames, so it removes VOC with high efficiency. Since there is almost no equipment cost and operation cost, the equipment cost and operation cost are drastically reduced compared to the previous method of FIG.

Claims (2)

As shown in FIG. 4, the system is applied to remove Volatile Organic Compounds (VOCs) emitted from facilities where painting and drying work alternately in one booth, such as an automobile paint booth. The discharge facility includes a paint booth (1), an air supply fan (3) for supplying air and dry heat, an air supply opening / closing damper (301), a dry heat supply burner (401), a combustion chamber, a dry heat supply heat exchanger (4), A burner combustion gas stack 402, a dry hot air circulation duct 9 and a circulation duct opening and closing damper 901, and an exhaust fan 6 and an exhaust stack 7 serving as exhaust devices; The volatile organic compound gas removal device is a main device that removes volatile organic compound gas during painting work. Several chambers with sufficient thermal insulation are arranged in parallel in the main body, and each chamber is filled with activated carbon or carbon fiber metrological adhesive. The inlet opening / closing dampers 501A / B / C and the outlet opening / closing dampers 502 are provided for opening the hosing tower 5 and the exhaust air during painting and closing them for drying; In the drying operation, the activated carbon inlet / outlet opening / closing dampers 501A / B / C, 502 are closed and the exhaust fan 6 is stopped. As a device for removing volatile organic compound gas (VOC) generated during a drying operation, a dry gas open / close damper connected to a dry gas exhaust pipe 801, which is a dry gas exhaust passage, and an electric interlock device with a burner to open dry gas when the burner is operated. 804, a burner combustion air hop inlet chamber 403 for putting volatile organic compound gas introduced through a dry gas exhaust pipe into burner combustion air and a burner 401 for burning volatile organic compound gas contained in combustion air It is done; In the drying operation, the activated carbon desorption regeneration device of the hop tower includes a desorption hot fan 10 for hop-in of hot waste heat gas discharged from the burner flue gas stack, a desorption hot air inlet pipe 802 that is a desorption hot air passage, and a desorption hot air. Desorption hot air opening / closing damper (805A / B / C) to open the chamber sequentially into each chamber A burner flame comprising a burner combustion chamber having a desorption hot air discharge pipe 803 for sending gas containing gas to the burner combustion chamber and a combustion chamber injection pipe 806, which burns and removes volatile organic compound gas by a high temperature flame. High temperature decomposition type VOC removal device. Drying operation only removes volatile organic gas (VOC) emitted from the facility. The discharge facility includes a drying furnace (2), an air supply fan (3), an air supply opening / closing damper (301), a drying heat supply burner (401), a drying hot air circulation duct (9), and an exhaust device. A vent 201; As a drying heat supply device and a volatile organic compound gas (VOC) removal device during drying operation, a drying gas exhaust fan 10 for hop-in of dry gas discharged into a vent, and a drying gas exhaust pipe (dry gas exhaust passage) 801) and a dry gas opening and closing damper (804) connected to the burner and the electrical interlock device during the drying operation to open the dry gas when the burner is operated, and putting the volatile organic compound gas introduced through the dry gas exhaust pipe into the burner combustion air. Burner combustion air hop inlet chamber 403 and the burner flame high temperature decomposition type VOC removal device characterized in that composed of a burner (401) for burning the volatile organic compound gas contained in the combustion air.