JPH05269414A - Apparatus for treating exhaust gas from spray booth - Google Patents

Abstract

PURPOSE:To ventilate a spray booth in a short time by supplying external air at least of the amount larger than that of the air being supplied during usual coating operation into the spray booth. CONSTITUTION:A closed circulation circuit is formed with a spray booth 1, a solvent adsorption rotor 19, and an air conditioner 12. The solvent which is adsorbed by the solvent adsorption rotor 19 is desorbed by hot air. The hot air after the desorption is sent to an incinerator 28 in which the desorbed solvent is burned, and the burnt gas is discharged in the air, forming a discharge circuit. A damper 21 is installed between the solvent adsorption rotor 19 and the air conditioner 12 which are installed in this closed circulation circuit. A purge duct 22 is installed which forms a branch between the damper 21 and the solvent adsorption rotor 19 to discharge air. The damper 21 is closed during the ventilation and the purge duct 22 is opened so that the closed circulation circuit is shifted to an open circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust treatment device for a coating booth of a closed circulation circuit type, and it is possible to replace air in the coating booth in a short time while maintaining the advantages of the closed circulation circuit type. The present invention relates to an exhaust treatment device for a coating booth.

[0002]

2. Description of the Related Art Exhaust treatment devices for coating booths are roughly classified into two types: a closed circuit type and an open circuit type. As disclosed in Japanese Patent Laid-Open No. 63-88076, for example, as an example of an open circuit system, outside air is introduced to a regenerative heater through a filter to raise the temperature of the air, and this air is introduced to a rotor type dehumidifier. It absorbs moisture and then guides this air to the heater and humidifier of the air conditioner to adjust the temperature and humidity of the air sucked into the air conditioner and guide it to the painting booth, where it finishes its work. When the air passes through the venturi, the paint mist contained in the air is removed and discharged as exhaust air, and this exhaust air is guided to a rotor-type dehumidifier to remove the water contained in the exhaust air. The solvent contained in the exhaust air is removed and treated with an activated carbon deodorizing device to be released into the atmosphere as clean air.

On the other hand, the closed circuit method is an open circuit method in which exhaust air discharged into the atmosphere is recycled, and by recycling the exhaust air in this manner, the exhaust air is recycled. In order to adjust the content of the solvent accumulated in the air to a certain amount, a small amount of air is exhausted from the air that is being recycled, and the amount of air that is being recycled is taken in by taking in fresh air as much as this exhausted amount. Maintaining and adjusting the concentration of the solvent in the air being recycled to reduce the amount of exhausted air to reduce the size of the exhaust treatment equipment and to effectively use the heat of the exhausted air to save energy. I am trying to make it.
Therefore, the closed circuit method has an advantage over the open circuit method in this respect.

Next, for coating automobiles, various kinds of organic solvents are used, from low boiling point solvents having a boiling point of around 80 ° C. to high boiling point solvents having a boiling point of around 200 ° C. Therefore, the exhaust gas discharged from the coating booth contains various solvents from the low boiling point solvent to the high boiling point solvent in a mixed state. All organic solvents up to the high boiling point must be removed.

On the other hand, an operator may have to enter the coating booth due to maintenance work or equipment trouble. In this way, when an operator enters the coating booth to perform work, the closed circulation circuit method must replace the air in the coating booth containing a large amount of solvent with the outside air to allow the operator to enter the room. I have to. And
It is required to replace air in the coating booth in a short time in order to shorten the total working time of the worker and increase the operation rate of the coating booth. Therefore, an exhaust treatment device for the coating booth is required to have a function of removing all of the organic solvent to eliminate the pollution problem and two functions of replacing the air in the coating booth in a short time to improve the operating rate. ..

Now, a conventional example of an exhaust treatment device of a coating booth adopting a closed circuit system is shown in FIG. 4 (METAL FINISHING MAY 19
Explained in Fig. 88 (p. 88 54), this exhaust treatment device supplies air whose temperature and humidity have been adjusted from the air chamber 38 to the automatic coating chamber 39, and the air that has finished its work in the automatic coating chamber 39 is blower 40. After being guided to the wet electrostatic coagulator 41 to remove the solvent contained in the air, the humidity and temperature are adjusted by the dehumidifier 42, and the closed circuit is constructed so as to be guided to the air chamber 38 again. There is. Then, the air discharge circuit 43 is branched from between the wet electrostatic condensator 41 and the dehumidifier 42, and the air discharge circuit 43 is provided with a combustion device 45 so that 10% to 20% of the circulating air amount is used.
% Of the air is sucked into the air discharge circuit 43 by the blower 44, and the solvent contained in the sucked air is burned to be discharged into the atmosphere as clean air. The amount of solvent that circulates in the circulation circuit and accumulates in the air is reduced. Also, an emergency release circuit 46 for the automatic painting booth 39 is branched from the inlet side of the wet electrostatic condenser 41. In the figure, D1 to D5 are dampers.

[0007]

In the exhaust treatment device for a closed-circuit type coating booth, the air in the automatic coating booth 39 is replaced as follows. That is, since the air in the automatic coating chamber 39 contains a large amount of solvent, it cannot be directly released into the atmosphere through the emergency release circuit 46 because of pollution problems. Therefore, the wet electrostatic coagulator 41 must remove the solvent to form clean air before it can be discharged.

Therefore, in the case of this closed circuit system, a damper is used.
Close D5 and open dampers D1 to D4 to drive blowers 40 and 44, suck outside air from damper D1 and air chamber 38, automatic coating chamber
The air containing a large amount of the solvent in 39 is displaced while being expelled, the solvent is removed by the wet electrostatic condensing unit 41, and the remaining solvent is incinerated by the incinerator 45 and released into the atmosphere.

However, the air discharge circuit 43 is operated from 10% of the amount of air circulating in the automatic coating chamber 39 during operation.
Blower 43 and incinerator 45 to treat 20% air
Since it has been selected that it is not possible to process more air than this, the amount of air sucked from the damper D1 will be an air amount equivalent to this, and a large amount of air in the automatic coating chamber 39 with a small air amount. There is a problem that it takes time to replace the air and the operating efficiency of the exhaust treatment device decreases.

In addition, the wet electrostatic condensing device 41 is designed so that the maximum efficiency can be obtained by setting the conditions of the air circulated during operation, that is, the temperature and humidity of the air, the air amount and the flow velocity, etc. suitable for the coating work conditions. Since it is planned, when the air condition at the time of air replacement in the automatic coating chamber 39 in which the amount is small and the temperature and humidity are not adjusted is different from the air condition at the time of the above operation, the wet electrostatic condenser 41 Efficiency (for example, solvent removal efficiency) decreases. As a result, the load of the incinerator 45 increases, and there is a risk that the solvent may be released into the atmosphere while containing the solvent. Further, in order to prevent this, it is necessary to specially install the heat recovery device 46, and there is a problem that the equipment cost increases.

The present invention provides an exhaust treatment device for a coating booth, which allows the air in the coating booth to be replaced in a short time while maintaining the advantages of the closed circulation circuit system.

[0012]

Means for Solving the Problems According to the present invention for solving the above-mentioned problems, air containing a solvent exhausted from a coating booth is passed through a solvent adsorption rotor to adsorb and remove the solvent, and then the air is removed. To the air conditioner to adjust the temperature and humidity of this air and to recirculate it again to the coating booth, and the solvent adsorbed and removed by the solvent adsorption rotor is desorbed with heated air and this heated air is burned. And a release circuit for releasing heated air into the atmosphere after burning the desorbed solvent, and a damper is provided between the solvent adsorption rotor and the air conditioner provided in the closed circulation circuit. It is characterized in that a purge circuit for discharging air is branched from the adsorption rotor.

[0013]

The present invention having the above-mentioned structure has the following functions. That is, in the operation of a normal exhaust treatment device that is performing painting work, after the air containing the solvent exhausted from the coating booth is passed through a solvent adsorption rotor to adsorb and remove the solvent, this air is sent to an air conditioner. A closed circulation circuit that guides the temperature and humidity of this air and recirculates it again in the painting booth is provided.This closed circulation circuit makes it possible to satisfy the atmospheric conditions suitable for painting in the painting booth. Moreover, since the solvent removed by the solvent adsorption rotor is desorbed with heated air, the heated air is guided to a combustion device to burn the desorbed solvent, and then the heated air is released into the atmosphere. The circuit keeps the adsorption performance of the solvent adsorption rotor and keeps the accumulated amount of the solvent contained in the air flowing in the closed circulation circuit constant while maintaining a large amount of clean air. It is possible to release in.

Next, when the worker replaces the air in the coating booth with the outside air when entering the coating booth,
Since a damper is provided between the solvent adsorption rotor and the air conditioner provided in the closed circulation circuit, and a purge circuit for branching out from the damper and the solvent adsorption rotor to release air is provided. It is possible to switch the closed circulation circuit to an open circuit by closing the valve and opening the purge circuit, and at least supplying more air than the fresh air amount during normal operation during painting into the painting booth. It is possible to replace the air in the coating booth with the outside air in a short time. Also, since a solvent adsorption rotor is used as the solvent removal device, it is possible to adjust the air processing capacity by controlling the rotation speed of this solvent adsorption rotor, and use a large amount of air to replace the air in the coating booth. Even so, the solvent adsorbing rotor can remove the solvent contained in the air, and the air in the coating booth can be replaced in a short time.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1 showing a flow system diagram of this embodiment, the inside of a coating booth 1 is partitioned by a filter 5 and a drainboard 6, and the inside thereof is provided with an air supply chamber 2 and a coating chamber 3 in order from above.
Further, an exhaust chamber 4 is formed, an automatic coating machine 7 and a conveyor 8 that conveys an object to be coated are installed on the drainboard 6, and a scrubber 9 is installed in the exhaust chamber 4.

A blower 11 and an air conditioner 12 are connected to the air supply chamber 2 by a duct 10, and the outside air taken in from an air intake port 14 connected to the air conditioner 12 via a damper 13 is an air conditioner. The temperature and humidity are adjusted by 12 and supplied to the air supply chamber 2, while the air exhausted from the exhaust chamber 4 is supplied to the dry filter 16, the heater 17, the activated carbon filter 18, and the activated carbon rotor 19. A closed circulation circuit is formed so as to be recycled to the air conditioner 12 via the adsorption zone 19a. 20 is a circulation blower.

A damper 21 is provided between the air conditioner 12 of the closed circuit and the activated carbon rotor 19, and a purge duct 22 is branched from between the damper 21 and the activated carbon rotor 19, and a damper 24 is provided in the purge duct 22. ing. In the case of the present embodiment, a damper 21 is provided between the circulation blower 20 and the air conditioner 12, and a purge duct 22 is branched from between the damper 21 and the circulation blower 20.

A regeneration air duct 29 is branched from the discharge side of the circulation blower 20, and a heater 30 and a desorption zone 19 for the activated carbon rotor 19 are provided.
b, a discharge circuit for discharging to the atmosphere through the combustor 28 is formed. 27 is a blower. Further, an exhaust collection duct 23 having a damper 26 is provided so as to connect the discharge side of the circulation blower 20 and the suction side of the blower 27 of the discharge circuit so as to bypass the desorption zone 19b of the activated carbon rotor 19. ..

Next, the activated carbon rotor 19 will be described with reference to FIG. 3. This activated carbon rotor 19 uses a so-called disc type adsorption rotor in which an adsorption element 33 formed of activated carbon fibers is wound in a rotor shape. While slowly rotating the rotor, while the raw gas 34 containing the organic solvent passes through the adsorption element 33 to 35 (passing through the adsorption zone), the organic solvent contained in the raw gas 34 is removed. While being adsorbed by the adsorbing element 33 and discharged as clean air, the desorption heating air 36 heated to a predetermined temperature on the other hand is adsorbing element.
The organic solvent adsorbed on the adsorbing element 33 is desorbed by passing it through a portion (desorption zone side) different from the passage portion of the raw gas 34 of 33, and is discharged from the adsorbing element 33 together with the desorption heating air 37. By doing so, the adsorption capacity of the adsorption element 33 is restored. By performing adsorption and desorption in parallel in this way, the exhaust gas discharged from the exhaust chamber 4 of the coating booth 1 can be treated. It is designed to be performed continuously.

The operation of the present embodiment thus constructed will be described below. First, the operation of a normal exhaust treatment device that is performing painting work is performed as follows. During this normal operation, the dampers 13, 24 and 26 are closed and the damper 21 is opened to form a closed circulation circuit. Then, the air whose temperature and humidity have been adjusted by the air conditioner 12 is supplied to the air supply chamber 2 by the blower 11, and the dust and the like contained in the air are removed by the filter 5 to apply the paint from above the coating chamber 3. It uniformly flows down over the entire area of the chamber 3, and the inside of the coating chamber 3 is maintained under an atmosphere of a condition suitable for a predetermined coating. Then, in the coating chamber 3, the object W to be coated, which is transported by the conveyor 8 and is moving, is coated by the automatic coating machine 7.

In this way, the solvent evaporated during the coating by the automatic coating machine 7 and the paint mist not adhered to the object to be coated pass through the drainboard 6 together with the air flowing down in the coating chamber 3. Flow into the exhaust chamber 4, most of the paint mist is removed by the scrubber 9, and the air containing the evaporated solvent and the remaining fine paint mist is exhausted from the exhaust chamber 4.

When the exhaust air discharged in this way passes through the dry filter 16, the fine mist which has not been removed by the scrubber 9 is completely removed first, and then passes through the heater 17, whereby the exhaust air is discharged. Is raised to adjust the relative humidity of the exhaust air (60% or less in one example) to reduce the influence of water on the next activated carbon filter 18 and the activated carbon rotor 19, and then the activated carbon filter 18 changes the solvent concentration over time. And the substances that inhibit the adsorption performance of the next activated carbon rotor 19 are removed.
While passing through the adsorption zone 19a of 19, the solvent contained in the exhaust air is adsorbed and removed. In the adsorption and removal of this solvent, the high-boiling point solvent with a boiling point of 100 ° C or higher that is easily adsorbed is usually adsorbed and removed, and the
Solvents with a low boiling point below 00 ° C are hardly adsorbed and removed.

In this way, the circulating air containing the low-boiling point solvent which has been adsorbed and removed from the high-boiling point solvent is recycled to the air conditioner 12 by the circulating blower 20. And the air conditioner 12
Before entering, some of this circulating air (abbreviated
10%) is sucked into the recycle air duct 29 by the blower 27, heated to a predetermined temperature (about 130 ° C.) by the heater 30 to be regenerated air, and then passed through the desorption zone 19b of the activated carbon rotor 19. During this passage, the solvent adsorbed in the adsorption zone 19a is desorbed to restore the adsorption performance of the adsorption zone 19a of the activated carbon rotor 19, and the desorbed solvent is burned in the combustor 28 and released into the atmosphere as clean air.

Since the amount of air circulated by this discharge is reduced by the amount of air for regeneration, the opening of the damper 13 is adjusted to take in the outside air from the outside air intake port 14 to replenish it, and at the same time, the fresh outside air is replenished with the solvent. To reduce the content ratio of. Further, since the desorption amount of the high boiling point solvent in the desorption zone 19b is too large and the high boiling point solvent which is not burned and cannot be completely burned in the combustor 28 is released into the atmosphere, it is not preferable from the viewpoint of pollution problem. The amount of regeneration air is reduced by adjusting the opening of the damper 26 and the amount of desorption is reduced to achieve complete combustion of the high boiling point solvent in the combustor 28. In this way, the exhaust treatment device is operated by the closed circulation circuit system in the normal operation during coating.

Examples of the solvent include low boiling point solvents such as methanol, ethanol, ethyl acetate, isopropyl alcohol, n-propyl alcohol, and methyl ethyl ketone, and high boiling point solvents such as n-butyl alcohol and isobutyl alcohol. , Methyl isobutyl ketone, butyl acetate, oxohexyl acetate, toluene, xylene, Solvesso 100, Solvesso 150,
Solvent naphtha, cellosolve, carbitol and the like. As an example, about 50% of the solvent in the exhaust air is a high boiling point solvent, and the activated carbon rotor 19 adsorbs and removes about 75% of the solvent in the total carbon amount. At this time, the number of revolutions of the activated carbon rotor 19 is once per hour, and this number of revolutions is controlled by the activated carbon rotor 19.
This is performed by rotating 19 via a motor 31 and a belt 32.

Next, replacement of air in the coating booth 1 when an operator enters the coating chamber 3 due to repair work or equipment trouble will be described. The dampers 13 and 24 are fully opened and the dampers 21 and 26 are fully closed as conditions for circuit setting when the air in the coating booth 1 is replaced. As a result, the closed circulation circuit is partially cut off by the damper 21, so that the closed circulation circuit is supplied from the air intake 14 to the air conditioner 12, the air supply chamber 2 of the coating booth 1, the coating chamber 3, the exhaust chamber 4, and the dry chamber. Filter 1
6, the heater 17, the activated carbon filter 18, the adsorption zone 19a of the activated carbon rotor 19, the circulation fan 20, the damper 24 to form an open circuit, and the heater 30 and the activated carbon rotor 19 desorption from the regeneration air duct 29 Zone 19b, blower 27 and combustor
Form a discharge circuit up to 28.

In this way, the blower 11, the circulating blower 20, and the blower 27 are driven after switching the closed circulation circuit to the open circuit by the damper 21. Alternatively, the closed circulation circuit can be switched to the open circuit by adjusting the opening condition of the damper from the normal operating state of driving these blowers.

As a result, the outside air sucked from the air intake 14 passes through the air conditioner 12 (in this case, the operation is stopped) from the air supply chamber 2 of the coating booth 1 to the inside of the coating chamber 3. Then, the air at the time of coating containing the solvent and the paint mist filling the coating chamber 3 is replaced by being pushed out by the fresh outside air sucked from the air intake port 14. The pushed out air flows into the exhaust chamber 4, the paint mist is removed by the scrubber 9, the remaining paint mist is removed by the dry filter 16, the relative humidity of the air is adjusted by the heater 17, and the activated carbon filter 18 is used. The solvent concentration is averaged over time and the inhibitor is removed, and after adsorbing and removing the solvent in the adsorption zone 19a of the activated carbon rotor 19, approximately 90% of air is released from the purge duct 22 to the atmosphere. On the other hand, part of the air is sucked from the regeneration air duct 29, heated by the heater 30 (about 150 ° C.), and introduced as desorption air into the desorption zone 19b of the activated carbon rotor 19 for desorption. The adsorption capacity of 19a is restored, and the desorbed solvent is completely combusted in the combustor 28, and about 10% of air is released into the atmosphere.

Since the automatic coating machine 7 is stopped when the air in the coating booth 1 is replaced, it is adsorbed by the circulating air passing through the adsorption zone 19a of the activated carbon rotor 19 after the automatic coating machine 7 is stopped. It means that the low boiling point solvent which is difficult to be contained is mainly contained. Therefore, the solvent adsorbed in the adsorption zone 19a of the activated carbon rotor 19 when replacing the air in the coating booth 1 is mainly a low boiling point solvent. Since this low boiling point solvent is difficult to be adsorbed in the adsorption zone 19a, but has a property of being easily desorbed, desorption is actively performed in the desorption zone 19b, and as a result, high adsorption performance of the adsorption zone 19a can be maintained.

Therefore, since the number of revolutions of the activated carbon rotor 19 can be increased to increase the level of adsorption capacity,
A large amount of air can be processed. As an example, the temperature of the regenerated air is set to 150 ° C and the rotation speed of the activated carbon rotor 19 is set to 4 hours / hour.
When rotated, about 90% or more of the solvent can be adsorbed and removed with a total hydrocarbon meter. Further, it is possible to raise the temperature of the regeneration air in this way because the low boiling point solvent has a small molecular weight, and even if the low boiling point solvent is thermally deteriorated by the overheated regeneration air, a rotor made of activated carbon of the activated carbon rotor 19 is used. This is because it has the property of being hard to remain. By increasing the temperature of the regenerated air by utilizing the property of the low boiling point solvent, the desorption rate in the activated carbon rotor 19 becomes faster, so that the adsorption capacity in the adsorption zone 19a of the activated carbon rotor 19 is further increased. It can be maintained and a large amount of air can be processed. Further, since the low boiling point solvent is contained in the regenerated air in a vaporized state, the regenerated air is easily combusted and the combustion chamber 28 can be downsized.

Since the closed circulation circuit can be switched to the open circuit by the damper 21, the purge circuit formed by the purge duct 22 and the damper 24 in this manner, the released air is released while releasing the entire amount of air in the coating booth 1. It is possible to take in a large amount of fresh air (approximately 10 times the fresh air supplied during normal painting, which is one example), and to adsorb the activated carbon rotor 19 at a high rotational speed. The capacity level can be increased and a large amount of air can be processed (in one example, the total hydrocarbon meter can remove about 90%). This makes it possible to perform exhaust processing that takes advantage of the closed circulation circuit during coating, and by the synergistic effect of the two conditions of switching to the open circuit during replacement and increasing the adsorption capacity level of the solvent adsorption rotor 19, It becomes possible to replace the air in the booth 1 in a short time. In the above description, the case where the activated carbon rotor 19 is used has been described, but even if a zeolite rotor is used instead of this, this action is the same.

Further, the high boiling point solvent which is easily adsorbed during ordinary coating is slowed down by reducing the rotation speed of the activated carbon rotor 19.
The low boiling point solvent which is difficult to be adsorbed is treated by the combustor 28 of the discharge circuit in 19a, and the low boiling point solvent which is hard to be adsorbed when the air in the coating booth 1 is replaced is increased in the rotation speed of the activated carbon rotor 19. The adsorption capacity can be adjusted by controlling the rotational speed of the activated carbon rotor 19 according to the operating conditions such as increasing the adsorption level in the adsorption zone 19a and removing it by adsorption, so the activated carbon rotor 19 can be downsized (almost If the adsorption capacity is lowered, it can be handled by controlling the rotation speed, which increases the degree of freedom in processing air conditions and extends the usage period. Can be achieved.

Next, referring to FIG. 1 of the second embodiment shown in FIG.
The difference from the first embodiment shown in FIG. 8 is that the activated carbon filter 25 is provided at the air outlet of the purge duct 22, and the other parts are denoted by the same reference numerals and the description thereof is omitted. The function of the adsorption zone 19a of the activated carbon rotor 19 during the air replacement in the coating booth 1 is as follows.
The residual solvent that could not be removed by the above is finally removed by this activated carbon filter 25, and is released into the atmosphere as completely clean air. The other operations are the same as those of the first embodiment shown in FIG. 1, and therefore their explanations are omitted.

[0034]

As described in detail above, according to the present invention, the air containing the solvent exhausted from the coating booth is passed through the solvent adsorption rotor to adsorb and remove the solvent, and then the air is guided to the air conditioner. Since the closed circulation circuit that adjusts the temperature and humidity of this air and recirculates it again in the painting booth, it is possible to satisfy the atmospheric conditions suitable for painting in the painting booth with this closed circulation circuit, and Since the solvent removed by the adsorption rotor is desorbed with heated air, the heated air is guided to the combustion device, and the desorbed solvent is burned, and then the heated air is released into the atmosphere. The adsorption performance of the rotor can be maintained, and the accumulated amount of the solvent contained in the air flowing in the closed circuit is kept constant and is released into the atmosphere as clean air. It is possible. As a result, it is possible to operate the normal exhaust treatment device at the time of coating, making the most of the advantages of the closed circulation circuit.

Further, a damper is provided between the solvent adsorption rotor and the air conditioner provided in the closed circulation circuit, and a purge circuit for branching from the damper and the solvent adsorption rotor to release air is provided. Therefore, by closing this damper and opening the purge circuit, the closed circulation circuit can be switched to the open circuit, and at least the amount of air during normal operation during painting must be supplied to the painting booth. The paint booth can be replaced with the outside air in a short time. Since a solvent adsorption rotor is used as the solvent removal device, it is possible to adjust the air treatment capacity by controlling the rotation speed of this solvent adsorption rotor, and use a large amount of air to remove the air in the coating booth. Even if the solvent is replaced, the solvent contained in the air can be removed by the solvent adsorption rotor, and the air in the coating booth can be replaced in a short time.

[Brief description of drawings]

FIG. 1 is a flow system diagram showing an embodiment of the present invention.

FIG. 2 is a flow system diagram showing another embodiment of the present invention.

FIG. 3 is a perspective view of the activated carbon rotor in FIGS. 1 and 2.

FIG. 4 is a flow system diagram of a conventional example.

[Explanation of sign]

 1 Coating booth 2 Air supply chamber 3 Painting room 4 Exhaust chamber 11 Blower 12 Air conditioner 13 Damper 14 Air intake 16 Dry filter 17 Heater 18 Activated carbon filter 19 Activated carbon rotor 19a Adsorption zone 19b Desorption zone 20 Circulation blower 21 Damper 22 Purge duct 24 Damper 25 Activated carbon filter 26 Damper 27 Blower 28 Combustor 29 Regenerative air duct 30 Heater

Claims (1)

[Claims] 1. An air exhausted from a coating booth containing a solvent is passed through a solvent adsorption rotor to adsorb and remove the solvent, and then the air is guided to an air conditioner to adjust the temperature and humidity of the air, and again. A closed circulation circuit for recirculating to the coating booth, and the solvent adsorbed and removed by the solvent adsorption rotor is desorbed with heated air, and this heated air is guided to a combustion device to burn the desorbed solvent and then release the heated air into the atmosphere. A discharge circuit is provided, a damper is provided between the solvent adsorption rotor and the air conditioner provided in the closed circulation circuit, and a purge circuit for discharging air is branched between the damper and the solvent adsorption rotor. An exhaust treatment device for a painting booth.