JP2009160484A - Organic solvent containing gas treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system which is capable of treating a VOC containing gas at a low cost by stabilizing a burning temperature in the post-treatment combustion apparatus. <P>SOLUTION: The organic solvent containing gas treatment system is provided with a condensation device which discharges a desorbed gas condensed by rotating a tubular adsorbent around its tubular axis, adsorbing an organic solvent in the gas containing the volatile organic solvent with a low concentration to the adsorbent passing through an adsorption part and blowing an air for desorption to the adsorbent that adsorbed the organic solvent passing through a desorption part, a combustion device for burning the desorbed gas, an adsorption part for a part of the desorbed gas-combustion device returning passageway, and a combustion device supplying passageway for the remaining part of the desorbed gas. The exit of the desorption part is divided into an area which guides the desorbed gas with a low temperature to the adsorption part-combustion device returning passageway and an area which guides the desorbed gas with a high temperature to the combustion device supplying passageway. Also a means to detect the change of the combustion state is installed. Thus, the amount of gas supplied to the combustion device in the adsorption part-combustion device returning passageway is controlled and the concentration of the organic solvent introduced to the combustion device is controlled. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an organic solvent-containing gas processing system for processing a gas containing a volatile organic compound (VOC “Volatile Organic Compound”) at a low running cost.

  Volatile organic compounds (VOC) such as toluene, isopropyl alcohol (IPA), xylene, methyl ethyl ketone (MEK), and ethyl acetate are used in paint factories, printing factories, and film laminating factories. If it diffuses and floats in the space, it will adversely affect the human body. Moreover, it is reported that when a VOC-containing gas is released into the atmosphere without being treated, a photochemical oxidant is generated, which pollutes the environment.

  Therefore, from the viewpoint of preventing air pollution, VOC emission standards are set in regulated plants, and it is obliged to observe the emission standards.

  Examples of gas purification methods for decomposing or removing VOC-containing gas include, for example, a direct combustion method in which VOC-containing gas is directly burned by a burner, a catalytic combustion method in which oxidative decomposition is performed by a catalyst, and a regenerative combustion method in which preheated with a heat storage material Etc. are known.

  In addition, when the concentration of the VOC gas is low, a processing system is known in which a VOC gas concentrator is installed in front of the combustor in order to reduce running fuel by reducing fuel input to the combustor (for example, patents). Reference 1).

FIG. 1 shows a general adsorption concentrating device. The adsorption concentrating device 60 adsorbs and removes a VOC-containing gas of, for example, 1000 Nm ³ / min with an adsorbent and discharges it as clean air, for example, 200 Nm. Desorbed with heated air at 180 ° C. at ³ / min to obtain a concentrated gas with a small air volume and high concentration.

  FIG. 2 shows an organic solvent processing system using a general adsorption concentrating device. The desorption gas obtained by the adsorption concentrating device 60 is subjected to oxidative decomposition treatment in a combustion device 61 and discharged as clean air. This system can reduce the amount of fuel used at the time of combustion by performing an adsorption concentration process, and can economically process the gas containing an organic solvent.

  In the concentrator for concentrating and processing the low-concentration VOC-containing gas as described above, even when the concentration of the gas to be processed is stable, a fixed type or cylinder type concentrator is used, or a disk Even in the mold concentrator, when the desorption air speed varies due to reinforcement of the ribs, the concentration of the desorption gas varies as shown in FIG. 3, for example. On the other hand, even in the case of a disk type concentrator where the fluctuation of the desorption wind speed is relatively small, if the gas concentration to be processed temporarily increases, the desorption gas concentration also temporarily increases, and the combustion device is within the control range. It was difficult to operate in a stable manner.

Due to this fluctuation in concentration, for example, in a post-treatment device such as a combustion device, the control of the combustion temperature necessary for oxidative decomposition of VOC is not stable, and if the temperature fluctuates low, the removal rate may decrease, In the case where the fluctuation is high, there is a problem that the temperature becomes higher than the endurance temperature of the combustion device and abnormal combustion temperature occurs.
JP-A-10-330

  The present invention was devised to solve the problems of the prior art, and its purpose is to treat a VOC-containing gas at a low running cost by stabilizing the combustion temperature in a post-treatment combustion apparatus. An object of the present invention is to provide an organic solvent-containing gas processing system capable of

  As a result of intensive studies to achieve the above object, the present inventor has found that the cause of the unstable control of the combustion temperature in the post-treatment combustion apparatus is the concentration fluctuation of the desorbed concentrated gas, and a method for suppressing the concentration fluctuation By installing multiple ducts at the desorption outlet, dividing the desorption part of the concentrator into multiple regions, and adjusting the amount of air supplied to the combustion device, it is possible to significantly suppress concentration fluctuations introduced into the combustion device. As a result, the present invention has been completed.

The present invention has the following two types of organic solvent-containing gas processing systems.
The first aspect of the present invention is:
Adsorption by rotating the cylindrical adsorber around its cylinder axis, adsorbing the organic solvent in the gas containing low-concentration volatile organic solvent to the adsorbent passing through the adsorbing part, and adsorbing the organic solvent passing through the desorbing part A concentrating device for discharging desorbed gas concentrated by blowing desorption air into the body;
A combustion apparatus for burning the desorption gas;
An adsorber / combustor return path for returning a part of the desorbed gas to the adsorber or the combustor;
A combustion apparatus supply passage for supplying the remaining portion of the desorption gas to the combustion apparatus,
A desorption portion having a high temperature and a first region partitioned so that an outlet portion of the desorption portion guides a desorption gas having a low temperature to the adsorbing portion / combustor return path in the rotation direction of the cylindrical adsorbent The gas is divided into a second region partitioned to guide the gas to the combustion device supply path;
An adsorber / combustion device is provided with means for detecting changes in the combustion state from the concentration of the organic solvent in the desorption gas introduced into the combustion device, the control temperature of the combustion device, or the amount of fuel gas supplied to the combustion device. The organic solvent-containing gas processing system is characterized in that the amount of gas supplied to the combustion device is controlled in the return path, and the concentration of the organic solvent introduced into the combustion device is controlled.

The second form of the present invention is:
Adsorption by rotating the cylindrical adsorber around its cylinder axis, adsorbing the organic solvent in the gas containing low-concentration volatile organic solvent to the adsorbent passing through the adsorbing part, and adsorbing the organic solvent passing through the desorbing part A concentrating device for discharging desorbed gas concentrated by blowing desorption air into the body;
A combustion apparatus for burning the desorption gas;
A desorption portion / combustion device return path for returning a part of the desorption gas to the desorption portion or the combustion device;
A combustion apparatus supply passage for supplying the remaining portion of the desorption gas to the combustion apparatus,
A desorption portion having a high temperature and a first region partitioned so that an outlet portion of the desorption portion guides a desorption gas having a low temperature to the desorption portion / combustor return path in the rotation direction of the cylindrical adsorbent The gas is divided into a second region partitioned to guide the gas to the combustion device supply path;
A desorption part / combustion device is provided with means for detecting changes in the combustion state from the concentration of the organic solvent in the desorption gas introduced into the combustion device, the control temperature of the combustion device, or the amount of fuel gas supplied to the combustion device. The organic solvent-containing gas processing system is characterized in that the amount of gas supplied to the combustion device is controlled in the return path, and the concentration of the organic solvent introduced into the combustion device is controlled.

  In the above-mentioned form of the present invention, the low or high temperature means that the temperature is low or high compared to the average desorption outlet temperature in the desorption outlet portion constituted by a single area (non-divided area). means.

  In the above embodiment of the present invention, the means for detecting the concentration of the organic solvent in the desorption gas introduced into the combustion apparatus is a VOC concentration meter, and controls the concentration of the gas supplied to the combustion apparatus within a certain concentration range. As a means, a damper linked to the VOC concentration meter is provided in the adsorber / combustor return path or the desorption / combustor return path.

  The said form of this invention WHEREIN: The heat exchanger which heats desorption air by heat-exchanging the exhaust gas produced by combustion of a combustion apparatus with desorption air can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the organic solvent containing gas processing system which can process VOC containing gas at low running cost can be provided.

  The organic solvent-containing gas treatment system of the present invention will be described below based on the embodiments shown in the drawings.

1. FIG. 4 shows the principle of an organic solvent-containing gas concentrator (hereinafter, abbreviated as a concentrator) of the system of the present invention.

  In the figure, a concentrating device 1 for adsorbing an organic solvent in a VOC-containing gas having a large air volume and a low concentration has a cylindrical case 3 that can rotate around a central axis 2. The adsorbent 4 having a honeycomb structure for adsorbing VOC (with the communication path oriented in the direction of the central axis) is housed to constitute a cylindrical adsorbent as a whole.

  The adsorbent 4 is appropriately selected from activated carbon fiber, zeolite paper, and the like according to the components of the VOC-containing gas.

  An adsorbing portion 1a and a desorbing portion 1b are partitioned on a moving path along which the cylindrical adsorbing body rotates, and an adsorbent (adsorbing body) 4 passes through the adsorbing portion 1a and the desorbing portion 1b alternately. ing.

  For example, a VOC-containing gas supply pipe 5 for introducing a VOC-containing gas generated in the factory and a purified air delivery for sending the purified air purified by the adsorbent 4 of the concentrator 1 to the factory. A tube 6 is provided.

  Moreover, the desorption part 1b is provided with a desorption air supply pipe 7 for blowing desorption heated air (for example, high-temperature dry air of 180 ° C.) to the adsorbent 4 that has adsorbed VOC. The desorbed gas is concentrated by setting the air volume to about 1/2 to 1/50 of the volume of the VOC-containing gas.

  The desorption outlet 1c is provided with a first pipe 8 and a second pipe 9, respectively, in the rotational direction of the cylindrical rotating body, and the first pipe 8 is a processing initial area (first area) in the desorption section 1b. The second conduit 9 is drawn from the late processing region (second region) in the detachable portion 1b.

2. Next, the purpose of dividing the desorption outlet 1c into a plurality of regions will be described.

  FIG. 5A is a graph obtained by measuring the desorption inlet temperature, the desorption outlet temperature, and the concentrated gas concentration (desorption outlet concentration) in the desorption part 1b for the concentration apparatus 1 shown in FIG. Each measured value is shown.

  In addition, 2450 ppm CH4 of VOC-containing gas (MEK, toluene, MIBK, etc.) was introduced into the adsorption part of the concentrator 1, and 180 ° C. desorption heated air was introduced into the desorption part.

  In FIG. 5A, the horizontal axis represents elapsed time (%), the left vertical axis represents temperature (° C.), and the right vertical axis represents gas concentration (ppmCH 4). The elapsed time represents the time from when the cylindrical adsorbent arrives at the start point (zero%) of the desorption part 1b to the end point (100%) of the desorption part 1b. The circumferential suction position at 1b is shown.

  As can be seen from FIG. 5 (a), when introduced with desorption heated air at 180 ° C., the desorption outlet temperature begins to rise with a delay (elapsed time of about 30%), and desorption occurs when the elapsed time reaches 100%. It is approximately 180 ° C. as with the inlet temperature. On the other hand, the concentration of the concentrated gas desorbed from the desorption section 1b increases as the desorption outlet temperature rises, reaches a peak at an elapsed time of 50%, and decreases thereafter.

Next, Table 1 shows the measurement results of the air volume, the desorption outlet temperature, and the desorption outlet concentration of the present invention example in which the desorption outlet portion 1c is divided into a plurality of regions (first and second regions in this embodiment). For comparison, a conventional disk rotor type concentrator 60 (see FIG. 1) having a single desorption region is also shown as a comparative example. The desorption outlet temperature and concentration in the measurement results are average values.

  As can be seen from Table 1, when the area ratio of the desorption outlet 1c is changed and divided into the first and second regions, a desorption gas having a low temperature and a low concentration is obtained from the first region of the present invention example. Desorption gas having a high temperature and high concentration can be obtained from the two regions.

  In the examples of the present invention, low or high concentration means that the concentration is lower or higher than the average desorption outlet concentration of the desorption part of the comparative example.

  As described above, if the range from the desorption start point to the desorption end point in the desorption part 1b is divided into the first region and the second region, desorption gases having different VOC gas concentrations can be selectively obtained.

  The present invention embodies a VOC-containing gas processing apparatus using a desorption gas having a different VOC concentration by paying attention to the fact that a desorption gas having a different VOC concentration can be obtained by dividing the desorption outlet 1c into a plurality of portions. is there.

3. Configuration of Desorption Outlet Portion in Concentrator Next, a specific configuration of the desorption outlet portion 1c will be described for the disk rotor type concentration device shown in FIG. 6 and the cylinder type concentration device shown in FIG.

3-1. Disc rotor type concentrating device A disc rotor type concentrating device 10 shown in FIG. 6 is configured to rotate a tubular adsorbent 11 having a honeycomb structure around a rotating shaft 12, and a VOC-containing gas is supplied to the cylindrical adsorbent 11. Clean air introduced from one side and purified from the other is taken out.

  Ducts 13 and 14 are arranged on both sides of the cylindrical adsorbent 11 so as to face each other. Desorption heated air is blown from the duct 13 to the cylindrical adsorbent 11, and desorption gas is emitted from the other duct 14. It is supposed to be discharged.

  Although the duct 14 faces the duct 13, the outer peripheral side length La of the duct 13> the outer peripheral side length Lb of the duct 14. That is, the passage area of the duct 14 is set smaller than the passage area of the duct 13 in the range 14 ′ indicated by the broken line.

  Thus, by changing the ratio of La and Lb of the outer peripheral side length of the duct, the desorption region can be divided into a desired first region and second region. Thereby, the desorption gas C having a relatively low VOC gas concentration from the first region (compared to the desorption outlet concentration of the comparative example) can be led to the first pipe line 8 shown in FIG. 4, and the VOC concentration is high. The desorption gas D can be led to the second pipeline 9. In addition, the arrow A in the figure indicates the rotation direction of the cylindrical adsorbent 11.

3-2. Cylinder type concentrator FIG. 7 shows the configuration of the cylinder type concentrator 20, wherein FIG. 7 (a) is an external view showing the entire configuration, and FIG. 7 (b) is an enlarged view of the desorption outlet. Is.

  The concentrator 20 has a vertical axis V.P. A VOC-containing gas is introduced from the outer peripheral side of the adsorbent 21 toward the center thereof, and the purified clean air is taken out from the space inside the adsorbent 21. .

  With respect to the adsorbent 21 that has adsorbed the VOC, the desorption heated air is blown to the adsorbent 21 from one duct (that is, the desorption air supply pipe 22) arranged so as to sandwich the adsorbent 21, and contains VOC. The desorbed gas is discharged from the other duct (that is, the desorption outlet 23).

  In FIG. 7 (b), the desorption outlet 23 is branched in a horizontal direction from a duct 23a provided in the vertical direction so as to partition the desorption area outlet of the adsorbent 21, and from the lower part of the duct 23a. A first conduit 23b and a second conduit 23c are provided.

  In the duct portion 23a, a partition plate 23d for dividing the desorption region outlet portion into a plurality of regions (two divisions in the figure) is provided in the vertical direction. A shaft 23f projects from the partition plate 23d through a guide groove 23e, and a nut 23g can be fastened to the shaft 23f. Thereby, if the nut 23g is loosened and moved in the left-right direction (arrow B direction), and the nut 23g is tightened at the moved position, the partition plate 23d can be fixed at a desired position, and the outlet portion of the detachment region Can be divided into a first area and a second area at an arbitrary ratio.

  The first region communicates with the first pipeline 23b with the partition plate 23d as a boundary, and the second region communicates with the second pipeline 23c. Thereby, the desorption gas from the desorption region is branched into two pipes 23b and 23c, and is taken out as desorption gas C and desorption gas D, respectively.

  The desorption gas C from the first region can be guided to the first conduit 8 shown in FIG. 4, and the desorption gas D from the second region can be guided to the second conduit 9.

4). VOC containing gas processing system Two forms of the processing system of this invention are demonstrated below.
4-1. First Processing System FIG. 8 shows a first embodiment of a VOC-containing gas processing system using the concentrator. In the following description, the same components as those in FIG. 4 are denoted by the same reference numerals and description thereof is omitted. Moreover, the desorption outlet part of the concentration apparatus 1 shown in FIG. 8 is divided | segmented into the 1st area | region and 2nd area | region which were shown to the example of this invention of Table 1. In FIG.

In the first region, the VOC gas concentration at the desorption outlet is lower than that in the desorption region of the concentrator of the comparative example (single region) (7430 → 2800 ppm CH ₄ ). Therefore, the VOC-containing gas supply pipe 5 is returned to the VOC-containing gas supply pipe 5 through the first pipe 8 serving as the adsorption section / combustion apparatus return path, and is used again as the raw gas, or the first as the adsorption section / combustion apparatus return path. The desorption gas D is returned to the second pipeline (combustion device supply channel) 9 through the pipeline 8 and used.

  In the initial stage of desorption, the adsorbent is not sufficiently heated and the desorption concentration is extremely low. Therefore, when the VOC gas concentration of the desorption gas D fluctuates, the amount of the desorption gas C with poor desorption efficiency supplied to the adsorption process again from the pipe 34 separated from the first pipe 8 and the first pipe 8 By adjusting the amount supplied to the combustion device 31 from the pipe line 35 separated from, the fluctuation of the VOC gas concentration of the desorption gas supplied to the combustion device 31 can be adjusted to be small.

  Measurement of the VOC gas concentration supplied to the combustion device 31 by the VOC concentration meter 36 installed in the combustion device supply path, with the damper 33 installed in the pipeline 34 and the pipeline 35 separated from the first pipeline 8 in the desorption gas C By controlling by the value, the fluctuation of the VOC gas concentration of the desorption gas supplied to the combustion device 31 can be adjusted to be small.

  As a method other than the control by the VOC gas concentration measurement value using the VOC concentration meter, the control by the combustion device temperature value using the in-furnace thermometer installed in the combustion device and the control by the fuel gas supply amount introduced into the combustion device are also possible. It is. In addition to the adjustment by the damper, controlling the blower with an inverter is also an effective means for achieving the object of the present invention.

  As the combustion apparatus 31, a direct combustion apparatus or a catalytic oxidation apparatus can be used. A direct combustion device is a device that directly contacts a combustible gas with a flame and oxidizes and decomposes it in a high temperature atmosphere of 700 to 850 ° C. for a predetermined time. A catalytic oxidation device preheats the combustible gas to about 200 to 350 ° C. These are devices that undergo oxidative decomposition by passing through a catalyst, both of which are known devices.

  The exhaust gas generated by the combustion of the combustion device 31 is introduced into the heat exchanger 32 and used for heat exchange for heating the desorption air.

4-2. Second Processing System FIG. 9 shows a second embodiment of the VOC-containing gas processing system using the concentrator 1. Note that the same components as those in FIG. 8 are denoted by the same reference numerals and description thereof is omitted. Further, the desorption outlet of the concentrating device 1 shown in FIG. 9 is also divided into the first region and the second region shown in the examples of Table 1.

In the first region, the VOC gas concentration at the desorption outlet is lower than that in the desorption region of the concentrator of the comparative example (single region) (7430 → 2800 ppm CH ₄ ). Therefore, it returns to the desorption air supply path 7 via the first pipe line 8 as the desorption part / combustion device return path, and is used again as desorption gas, or the first as the desorption part / combustion apparatus return path. The desorption gas D is returned to the second pipeline (combustion device supply channel) 9 through the pipeline 8 and used.

  In the initial stage of desorption, the adsorbent is not sufficiently heated and the desorption concentration is extremely low. Therefore, when the VOC gas concentration of the desorption gas D fluctuates, the desorption gas C having a low desorption efficiency is supplied again to the desorption process from the pipe 37 separated from the first pipe 8, and the first pipe 8 By adjusting the amount supplied to the combustion device 31 from the pipe line 35 separated from, the fluctuation of the VOC gas concentration of the desorption gas supplied to the combustion device 31 can be adjusted to be small.

  Measurement of the VOC gas concentration supplied to the combustion device 31 by the VOC concentration meter 36 installed in the combustion device supply path, with the damper 33 installed in the pipeline 35 and the pipeline 37 separated from the first pipeline 8 in the desorption gas C By controlling by the value, the fluctuation of the VOC gas concentration of the desorption gas supplied to the combustion device 31 can be adjusted to be small.

  As a method other than the control by the VOC gas concentration measurement value using the VOC concentration meter, the control by the combustion device temperature value using the in-furnace thermometer installed in the combustion device and the control by the fuel gas supply amount introduced into the combustion device are also possible. It is. In addition to the adjustment by the damper, controlling the blower with an inverter is also an effective means for achieving the object of the present invention.

  In addition, as the said combustion apparatus 31, the direct combustion apparatus and catalytic oxidation apparatus which are all well-known apparatuses can be used like a 1st embodiment.

  The exhaust gas generated by the combustion of the combustion device 31 is introduced into the heat exchanger 32 and used for heat exchange for heating the desorption air.

  In the above two systems, if a plurality of concentrators are arranged, VOC can be reliably adsorbed even if the volume of the VOC-containing gas to be processed is large.

It is explanatory drawing which showed the general concentration apparatus. It is explanatory drawing which showed the general VOC processing apparatus. It is a measurement chart of concentration outlet concentration. It is a principle figure of the concentration apparatus of this invention. (A) is the graph which shows the desorption characteristic of a concentration apparatus, (b) is the table | surface which showed the measured value of the desorption characteristic. It is a perspective view which shows the structure of the disk rotor type | mold concentration apparatus with which this invention is applied. (A) is a perspective view which shows the structure of the cylinder type concentration apparatus with which this invention is applied, (b) is an enlarged view of the attachment-and-detachment exit part. It is explanatory drawing which shows 1st embodiment of a VOC containing gas processing system. It is explanatory drawing which shows 2nd embodiment of a VOC containing gas processing system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concentrator 1a Adsorption part 1b Desorption part 1c Desorption outlet part 2 Center axis 3 Case 4 Adsorbent 5 VOC containing gas supply pipe 6 Purified air delivery pipe 7 Desorption air supply pipe 8 1st pipe line 9 2nd pipe line 10 Disc Rotor type concentrator 11 Cylindrical adsorber 12 Rotating shaft 13 Duct 14 Duct 20 Cylinder type concentrator 21 Adsorbent 22 Desorption air supply pipe 23 Desorption outlet part 23a Duct part 23b First pipe line 23c Second pipe line 23d Partition plate 23e Guide groove 23f Shaft 23g Nut 30 VOC-containing gas processing system 31 Combustion device 32 Heat exchanger 33 Damper 34 Adsorption part return path 35 Combustion apparatus supply path 36 VOC concentration meter 37 Desorption part feedback path 40 VOC-containing gas processing system 60 Concentrator 61 Combustion device

Claims (3)

Adsorption by rotating the cylindrical adsorber around its cylinder axis, adsorbing the organic solvent in the gas containing low-concentration volatile organic solvent to the adsorbent passing through the adsorbing part, and adsorbing the organic solvent passing through the desorbing part A concentrating device for discharging desorbed gas concentrated by blowing desorption air into the body;
A combustion apparatus for burning the desorption gas;
An adsorber / combustor return path for returning a part of the desorbed gas to the adsorber or the combustor;
A combustion apparatus supply passage for supplying the remaining portion of the desorption gas to the combustion apparatus,
A desorption portion having a high temperature and a first region partitioned so that an outlet portion of the desorption portion guides a desorption gas having a low temperature to the adsorbing portion / combustor return path in the rotation direction of the cylindrical adsorbent The gas is divided into a second region partitioned to guide the gas to the combustion device supply path;
An adsorber / combustion device is provided with means for detecting changes in the combustion state from the concentration of the organic solvent in the desorption gas introduced into the combustion device, the control temperature of the combustion device, or the amount of fuel gas supplied to the combustion device. An organic solvent-containing gas treatment system that controls the amount of gas supplied to the combustion device in the return path for controlling the concentration of the organic solvent introduced into the combustion device. Adsorption by rotating the cylindrical adsorber around its cylinder axis, adsorbing the organic solvent in the gas containing low-concentration volatile organic solvent to the adsorbent passing through the adsorbing part, and adsorbing the organic solvent passing through the desorbing part A concentrating device for discharging desorbed gas concentrated by blowing desorption air into the body;
A combustion apparatus for burning the desorption gas;
A desorption portion / combustion device return path for returning a part of the desorption gas to the desorption portion or the combustion device;
A combustion apparatus supply passage for supplying the remaining portion of the desorption gas to the combustion apparatus,
A desorption portion having a high temperature and a first region partitioned so that an outlet portion of the desorption portion guides a desorption gas having a low temperature to the desorption portion / combustor return path in the rotation direction of the cylindrical adsorbent The gas is divided into a second region partitioned to guide the gas to the combustion device supply path;
A desorption part / combustion device is provided with means for detecting changes in the combustion state from the concentration of the organic solvent in the desorption gas introduced into the combustion device, the control temperature of the combustion device, or the amount of fuel gas supplied to the combustion device. An organic solvent-containing gas treatment system that controls the amount of gas supplied to the combustion device in the return path for controlling the concentration of the organic solvent introduced into the combustion device.   3. The organic solvent-containing gas treatment system according to claim 1, further comprising a heat exchanger that heats the desorption air by exchanging heat with exhaust gas generated by the combustion of the combustion device. .