JP5205572B2 - Treatment system for volatile organic compounds - Google Patents

Description

  The present invention relates to a treatment system for volatile organic compounds. That is, the present invention relates to a processing system that uses exhaust gas containing a volatile organic compound (VOC) as engine fuel.

《Technical background》
Toluene, xylene, ethyl acetate, butyl acetate, IPA, MEK, and other volatile organic compounds are used as solvents, for example, gravure printing, other printing, coating, painting, and bonding processes, and heating processes thereof. It is contained in exhaust gas and effluent discharged from the drying process, cleaning process and the like.
And it is known as a cause of airborne particulate matter (SPM) and photochemical oxidants that cause environmental pollution, and in view of the serious adverse health effects, The emission regulations have been further strengthened.

<Conventional technology>
Therefore, a VOC recovery device has been conventionally attached to such a volatile organic compound (VOC) generation process. A typical VOC recovery device is as follows.
That is, exhaust gas and waste liquid (heated and vaporized in advance) containing volatile organic compounds are supplied to the VOC recovery device. → The contained volatile organic compound is first adsorbed on an adsorbent such as activated carbon, and then desorbed by steam spraying and collected as a waste liquid.
→ Such an operation is continuously processed in batch using a plurality of VOC recovery devices. → The recovered VOC waste liquid is composed of, for example, a volatile organic compound having a concentration of about 20 wt% (about 80 wt% of water) and is temporarily stored in a tank or the like.
→ The VOC waste liquid was then treated as follows. That is, a. A dehydration treatment by a distillation method or a polymer membrane method to purify, purify or reuse a volatile organic compound, or b. Supply to a boiler, gas turbine or the like together with steam or auxiliary combustor for combustion treatment, or use a catalyst for combustion treatment, or c. (In many cases, it was transported to remote areas) and was treated for disposal and soil microorganisms.
In addition, without passing through the VOC recovery device, the exhaust gas containing the volatile organic compound is directly subjected to the combustion treatment according to the above b as it is.

≪Problem≫
By the way, about such a prior art example, the problem was pointed out to processing cost, ie, the installation cost and running cost for processing. First, with regard to the conventional example of a above, which purifies and reuses volatile organic compounds, ancillary equipment such as distillation equipment, heating equipment, polymer membranes, etc. are essential, and this kind of ancillary equipment is large, large-scale, In view of the complexity and sophistication, there is a problem that the equipment cost increases. Furthermore, problems such as heating and other running costs are increasing, and a long time is required for the purification process.
Also, the conventional example of b to be subjected to the combustion treatment has been pointed out that a large amount of a combusting agent and a catalyst are required, and the operation cost and running cost are too high. Regarding the conventional example of c to be disposed of, there are problems in terms of transportation cost and running cost, as well as environmental pollution.
By the way, as a technique for reforming a general hydrocarbon-based fuel into a hydrogen-rich gas and utilizing it, for example, the technique disclosed in the following Patent Document 1 is disclosed, but this technique is a volatile organic compound. The combination of the engine and the engine is not specifically disclosed. In other words, it is not intended to concentrate volatile organic compounds and use them as fuel for rotary engines.

Japanese Patent Laid-Open No. 2002-12404

<< About the present invention >>
In view of such circumstances, the volatile organic compound treatment system of the present invention has been made to solve the problems of the conventional examples.
The present invention firstly uses volatile organic compounds efficiently and efficiently as engine fuel, and secondly, volatile organic compounds are realized while being excellent in equipment cost and running cost. The purpose is to propose a processing system.

<About Claim>
The technical means of the present invention for solving such a problem is as follows.
The processing system for volatile organic compounds according to claim 1 is a processing system for exhaust gas 1 containing volatile organic compounds, and includes a concentrating device 4, a recovery device 5, a combustion device 6, and an engine 2. .

The concentrating device 4 adsorbs the volatile organic compound contained in the supplied exhaust gas 1 and desorbs the adsorbed volatile organic compound by blowing hot air 9, thereby A concentrated gas 8 in which the organic compound is concentrated 2 to 50 times is generated.
The recovery device 5 adsorbs the volatile organic compound contained in the concentrated gas 8 discharged and supplied from the concentration device 4 to a filter and blows the adsorbed volatile organic compound to the steam 11. Detach by attaching.
Accordingly, the concentrated gas 8 passes through the recovery device 5 and is discharged as a new purified concentrated gas 12.

The combustion device 6 combusts the concentrated gas 8 discharged and branched and supplied from the concentrating device 4, and supplies hot air 9 based on the combustion heat to the concentrating device 4 as desorption.
The engine 2 uses the volatile organic compound in the concentrated gas 12 supplied from the recovery device 5 as fuel, and supplies the exhaust gas 3 as hot air 9 to the concentration device 4 as desorption. It is characterized by this.

<About the action>
Since the present invention comprises such means, the following is achieved.
(1) This processing system includes a concentrator, an engine, a recovery device, a combustion device, and the like.
(2) The exhaust gas containing the volatile organic compound is supplied to the concentrator.
(3) In the concentrator, volatile organic compounds are adsorbed and desorbed by hot air blowing.
(4) Thus, a concentrated gas in which the content of the volatile organic compound is concentrated by about 2 to 50 times is generated.
(5) The concentrated gas is supplied to an engine such as a rotary engine via a recovery device.
(6) In the recovery device, volatile organic compounds are adsorbed and desorbed by steam spraying.
(7) As hot air for desorption of the concentrator, the amount of heat of the combustion device that burns the concentrated gas and the high-temperature exhaust gas of the engine are used.
(8) Now, the treatment system of the present invention concentrates volatile organic compounds and uses the combustible components as engine fuel. Rather than simply removing volatile organic compounds, the enthalpy is extracted and used effectively.
(9) The processing system of the present invention comprises a concentrating device, a recovery device and a combustion device, mainly an engine, and a concentrated gas combustion device and engine exhaust gas are used as hot air of the concentrating device. . In this processing system, each configuration is related cyclically and cyclically.
(10) The volatile organic compound treatment system of the present invention exhibits the following effects.

<< First effect >>
First, a volatile organic compound (VOC) is effectively used as an engine fuel.
That is, in the treatment system of the present invention, the volatile organic compound is concentrated and used as an engine fuel and used as an electric power or other energy source.
Suspended particulate matter (SPM) and volatile organic compounds as photochemical oxidant causative substances are collected by a VOC recovery device as in the above-mentioned conventional example, and are concentrated as they are instead of being burned or disposed of. Efficient use.
That is, the treatment system of the present invention is not a system that simply removes volatile organic compounds as in the conventional example, but draws out and releases the thermal energy possessed by the volatile organic compounds, the enthalpy stored in the system, It consists of an effective thermochemical regeneration system.

≪Second effect≫
Second, this is realized while being excellent in equipment cost and running cost. That is, the treatment system of the present invention is provided with a collecting device and a combustion device together with a concentrating device and an engine. As a result, the system configuration is simple, and each configuration is related in a cyclical, cyclical, and mutually complementary manner, so that system operation is efficient and efficient.
In other words, unlike the above-mentioned conventional example, the equipment is simplified without requiring distillation equipment, heating equipment, polymer membranes, etc. for refining and reuse, and large, large-scale, complicated and fine equipment. It is excellent in equipment cost such as simplification, miniaturization and downsizing.
The hot air used in the concentrator is also excellent in operating cost and running cost, such as being generated by utilizing concentrated gas of volatile organic compounds and exhaust gas of the engine. Unlike conventional examples, heating costs are not increased and a large amount of a combustor and a catalyst are not required, and further, a long time is required for processing, and transportation costs and environmental pollution problems do not occur.
As described above, the effects exerted by the present invention are remarkably large, such as all the problems existing in this type of conventional example are solved.

《About drawing》
The volatile organic compound treatment system of the present invention will be described in detail below based on the best mode for carrying out the invention shown in the drawings.
FIG. 2 is a flow chart illustrating an example of the best mode for carrying out the present invention. 1 and 3 are configuration flow diagrams of reference examples not belonging to the present invention.

About volatile organic compounds
The present invention relates to a treatment system for volatile organic compounds. First, volatile organic compounds will be described.
Volatile organic compounds (VOLATILE ORGANIC COMPOUNDS, VOC for short) are typically the following substances and other hydrocarbon compounds (in addition to these, chlorofluorocarbon compounds are also possible) and have a boiling point of 50 ° C. or higher to 260 ° C. It is defined as a liquid material that is composed of less than ° C, is mainly artificially synthesized, and easily vaporizes and volatilizes when dispersed in the atmosphere.
・ Methyl ethyl ketone (MEK, CH3COCH2CH3)
・ Isopropyl alcohol (IPA, CH3CH (CH3) OH)
・ Ethyl acetate (CH3COOCH2CH3)
・ Butyl acetate (CH3COO (CH2) 3CH3)
・ Toluene (CH5CH3)
・ Xylene (CH4 (CH3) 2)
・ Benzene (C6H6)
・ Ethanol (C2H5OH)
・ Trichloroethane (C2H5Cl3)
・ Limonene (C10H16)

As the volatile organic compound, one or a plurality of types (in many cases, a plurality of types) in each of the above-mentioned substances is selected and used as a solvent or the like.
For example, in the exhaust gas and effluent discharged from each process of gravure printing, other printing, coating, painting, adhesion, heating, drying process, cleaning process, and other various chemical treatment processes, for example, solvent The volatile organic compound used as is contained.
The treatment system of the present invention is attached to the generation process of such a volatile organic compound, and the exhaust gas 1 containing the volatile organic compound is supplied.
First, the waste liquid containing the volatile organic compound is heated and vaporized in advance, and is supplied to the treatment system as the exhaust gas 1 containing the volatile organic compound. For example, the waste liquid is heated, vaporized, and converted into exhaust gas 1 by a preheater that uses the heat quantity of the exhaust gas 3 of the engine 2 such as a rotary engine described later.
Secondly, the volatile organic compounds contained in the exhaust gas 1 are often composed of a plurality of types as described above, but the specific breakdown patterns of the constituent components are various as follows, for example. Of course, in addition to the following, there are constituent component patterns of various contents and ratios.
Pattern 1: Toluene 40 wt%, xylene 20 wt%, isopropyl alcohol 20 wt%, ethyl acetate 20 wt%
Pattern 2: toluene 40 wt%, xylene 10 wt%, methyl ethyl ketone 20 wt%, isopropyl alcohol 20 wt%, butyl acetate 10 wt%
Pattern 3: toluene 30 wt%, xylene 10 wt%, methyl ethyl ketone 30 wt%, isopropyl alcohol 10 wt%, ethyl acetate 10 wt%, butyl acetate 10 wt%
Pattern 4: toluene 35 wt%, xylene 7 wt%, methyl ethyl ketone 22 wt%, isopropyl alcohol 27 wt%, ethyl acetate 9 wt%
Pattern 5: ethyl acetate 59 wt%, butyl acetate 13 wt%, isopropyl alcohol 22 wt%, methyl ethyl ketone 6 wt%
The volatile organic compounds are as described above.

≪About processing system overview≫
Hereinafter, the system processing of the present invention will be described. In this processing system, the exhaust gas 1 containing a volatile organic compound is a processing target.
And it is comprised centering on the concentration apparatus 4 and the engine 2, and also the collection | recovery apparatus 5, the combustion apparatus 6, the generator 7, etc. are attached.
The processing system is generally configured as described above. Hereinafter, each configuration will be described in detail.

≪About the concentration device 4≫
First, the concentration apparatus 4 will be described. The concentrating device 4 concentrates the volatile organic compound contained in the supplied exhaust gas 1 to generate a concentrated gas 8. That is, the concentrating device 4 adsorbs the volatile organic compound and desorbs the adsorbed volatile organic compound by blowing hot air 9 so that the content of the volatile organic compound is about 2 to 50 times. To produce a concentrated gas 8 concentrated to
Such a concentrating device 4 will be further described in detail. Air containing the volatile organic compound, that is, the exhaust gas 1 is supplied to the concentrating device 4 via a pipe line in which a blower, a prefilter, and the like are interposed.
The concentrating device 4 is made of, for example, a honeycomb structure that can rotate on a rotor about a shaft. The exhaust gas 1 is adsorbed to the adsorbent applied to the outer surface of the cell wall while passing through a large number of cell spaces partitioned by the cell wall.
Thus, the exhaust gas 1 is adsorbed and removed by the volatile organic compound, becomes purified air 10 that is cleaned, and is released into the atmosphere. On the other hand, the adsorbed volatile organic compound is desorbed by blowing hot air 9 with the rotational displacement of the honeycomb structure, and is discharged as a concentrated gas 8.
Compared with the exhaust gas 1, the concentrated gas 8 has a volatile organic compound content of about 2 to 50 times, typically about 3 to 10 times. For example, the concentration of about 0.6 wt% is concentrated to about 6 wt%.
The concentrating device 4 is as described above.

≪About collection device 5≫
Next, the collection device 5 will be described. The recovery device 5 is supplied with the concentrated gas 8 from the concentration device 4, adsorbs the contained volatile organic compound to the filter, and desorbs the adsorbed volatile organic compound by spraying the steam 11.
Such a recovery device 5 will be described in further detail. The recovery device 5 is provided with an adsorbent filter such as an activated carbon filter, and the concentrated gas 8 supplied from the concentrating device 4 via a pipe line is concentrated in the volatile organic compound. The purified air 10 that has been adsorbed and removed and thus cleaned is released into the atmosphere.
Then, the volatile organic compound adsorbed on the adsorbent filter is desorbed, recovered and purified by the steam 11 sprayed in a batch manner, and the concentrated gas 8 is discharged as a new concentrated gas 12. The adsorbent filter is regenerated and reused every time the steam 11 is sprayed.
The recovery device 5 is as described above.

≪About combustion device 6≫
Next, the combustion device 6 will be described. The combustion device 6 burns the concentrated gas 8 supplied from the concentration device 4 and supplies hot air 9 based on the combustion heat to the concentration device 4 as desorption.
In other words, the combustion device 6 preheats the concentrated volatile organic compound contained in the concentrated gas 8 supplied from the concentrating device 4 through a pipe line, and then combusts it immediately. In the illustrated example, a catalyst is used for this combustion, and liquefied natural gas or the like is used as the auxiliary fuel 13 as necessary.
The amount of heat generated by the combustion is used for heat exchange of the outside air that is blown and supplied to the concentrating device 4, so that the outside air becomes desorption heated air, that is, hot air 9, and is introduced into the concentrating device 4.
The combustion device 6 is as described above.

<About Engine 2>
Next, the engine 2 will be described. The engine 2 is driven using the concentrated gas 12.
That is, the engine 2 is driven using the volatile organic compound in the concentrated gas 12 supplied from the recovery device 5 as fuel.
The engine 2 is typically composed of a rotary engine, and its main shaft is connected to an adjacent generator 7. In addition, the exhaust gas 3 of the engine 2 is supplied to the concentrator 4 as hot air 9 as desorption.

Such an engine 2 will be further described in detail. As the engine 2, a rotary engine is typically used, and the concentrated gas 12 supplied from the recovery device 5 through a pipe line is driven as fuel.
That is, the engine 2 is operated using a volatile organic compound combustible component such as a hydrocarbon compound contained in the concentrated gas 12, that is, carbon (graphite) or hydrogen as its fuel. In addition, a cooling unit 15 with cooling water 14 is interposed in the pipeline from the recovery device 5 to the engine 2, and water vapor in the concentrated gas 12 is discharged and removed as concentrated water.
As is well known, a rotary engine that is a representative example of the engine 2 is an intermittent combustion / volumetric internal combustion engine in which a rotor rotates eccentrically in a combustion chamber and transmits rotational force to a main shaft. The main shaft is connected to an adjacent generator 7 and the drive is output for power generation. Of course, it can also be used as a drive energy source other than electric power for various purposes.
First, the exhaust gas 3 of the rotary engine is 650 ° C. or higher, for example, about 800 ° C. to 900 ° C.
Secondly, such a rotary engine is typically used as the engine 2, but other reciprocating engines such as a diesel engine and a gas engine can be used, and a gas turbine and the like can also be used. In these cases, the exhaust gas 3 is about 300 ° C to 600 ° C, for example, about 350 ° C to 450 ° C.
Thirdly, the exhaust gas 3 having a high temperature of such an engine 2, particularly a rotary engine, is supplied as hot air 9 to the concentrator 4 as desorption.
Fourthly, liquefied natural gas or the like is used as the auxiliary fuel 13 as the fuel of the engine 2 as necessary.
The engine 2 is as described above.

≪About illustration≫
Next, illustration will be described. First, in the processing system of the reference example not belonging to the present invention shown in FIG. 1, the concentrated gas 8 discharged from the concentrating device 4 is branched in the middle. One is directly supplied to one engine 2 and the other is supplied to the recovery device 5 and then supplied to the other engine 2 as the concentrated gas 12.
In the processing system of the example of the present invention shown in FIG. 2, the concentrated gas 8 discharged from the concentrating device 4 is supplied to the engine 2 as the concentrated gas 12 via the recovery device 5.
In the processing system of the reference example not belonging to the present invention in FIG. 3, the concentrated gas 8 from the concentrating device 4 is directly supplied to the engine 2.
In each example, the concentrated gas 8 discharged from the concentrating device 4 is further branched and supplied to the combustion device 6, so that hot air 9 is generated and supplied to the concentrating device 4 as desorption. Further, the exhaust gas 3 from the engine 2 is supplied to the concentrator 4 as hot air 9.
The illustrated example is like this.

《Action etc.》
The volatile organic compound treatment system of the present invention is configured as described above. Therefore, it becomes as follows.
(1) This processing system includes a concentrating device 4 and an engine 2, and further includes a recovery device 5, a combustion device 6, a generator 7, and the like.

(2) The exhaust gas 1 containing a volatile organic compound (VOC gas) is supplied to the concentrator 4. The concentration of the volatile organic compound is, for example, about 0.6 wt%.
Typical examples of the volatile organic compound include methyl ethyl ketone, isopropyl alcohol, ethyl acetate, butyl acetate, toluene, xylene, benzene, ethanol, trichloroethane, limonene and the like.

  (3) In the concentrator 4, the volatile organic compound (VOC gas) contained in the supplied exhaust gas 1 is adsorbed and then desorbed by blowing hot air 9.

  (4) Accordingly, the concentrated gas 8 from which the volatile organic compound (VOC gas) is desorbed and concentrated is generated and discharged from the concentrating device 4. The concentrated gas 8 has a volatile organic compound concentration of about 6 wt%, for example, and the content of the volatile organic compound is about 2 to 50 times that of the exhaust gas 1 before processing, typically about It is about 3 to 10 times.

  (5) The concentrated gas 8 discharged from the concentrating device 4 is supplied as fuel to the engine 2 as the concentrated gas 12 via the recovery device 5.

  (6) In the recovery device 5, after the volatile organic compound (VOC gas) in the concentrated gas 8 is adsorbed, it is desorbed by spraying the steam 11, and the concentrated gas 12 is discharged.

  (7) The hot air 9 used for desorption in the concentrating device 4 uses the amount of heat of the combustion device 6 and the high-temperature exhaust gas 3 of the engine 2. The combustion device 6 burns the concentrated gas 8 from the concentration device 4 to generate combustion heat.

(8) Now, the treatment system of the present invention concentrates the volatile organic compound (VOC gas) contained in the exhaust gas 1 in this way, and thus the combustible component such as carbon and hydrogen is supplied to the engine 2. Use as fuel.
In other words, the volatile organic compound is not simply removed, but immediately converted into a fuel for reuse and effective use. Extract and effectively use the enthalpy stored for volatile organic compounds.

(9) Moreover, the processing system of this invention consists of the collection apparatus 5, the combustion apparatus 6, etc. centering on the concentration apparatus 4 and the engine 2. FIG.
Desorption hot air 9 in the concentrating device 4 is generated using the combustion device 6 using the concentrated gas 8 and the exhaust gas 3 of the engine 2. In this processing system, the components are related in a cyclical, cyclical, and mutually complementary manner.
The operation of the present invention is as described above.

Here, an embodiment of the processing system of the present invention, that is, an example of its specifications will be described.
First (1), in this specification, the exhaust gas 1 supplied to the system contains a mixed VOC gas of a volatile organic compound of about 0.6 wt% or less.
That is, the components of this mixed VOC gas were measured values of ethyl acetate: 3,539 ppm, butyl acetate: 1,124 ppm, isopropyl alcohol (IPA): 942 ppm, methyl ethyl ketone (MEK): 244 ppm, and a total of 5,849 ppm. there were.
Next, (2), from the component amount of this specification, the mole fraction and the number of atoms contained in the mole fraction were calculated for each component of the mixed VOC gas based on the molecular formula and molecular weight.
Based on this, the total number of atoms of carbon atoms (C), hydrogen atoms (H), and oxygen atoms (O) as the constituent components was calculated and converted per carbon atom. As a result, the average molecular formula per carbon atom (average empirical formula) was CH2.11O0.43 (the average and total molecular weight was 20.99).
Therefore, (3), the combustion reaction formula per carbon atom of CH2.11O0.43, which is a mixed VOC gas of volatile organic compounds, is expressed as follows.

  Next, as (4), an approximate value (ignoring latent heat and the like), the combustion heat per mole of CH2.11O0.43 was determined. The combustible components are 1 mol of carbon atoms (graphite) and 2.11 / 2 mol of hydrogen molecules. Then, each combustion equation becomes the following chemical formulas 2 and 3, and therefore, the combustion equation of the entire CH2.11O0.43 which is the mixed VOC gas of the volatile organic compound is chemical formula 4. The amount of heat per mole of 166.13 kcal corresponds to 78% of methane.

Then, (5), a required air amount (the amount of air in the exhaust gas 1) sufficient to completely burn this CH2.11O0.43 is obtained.
The theoretically necessary amount of air is 6.26 moles by adding nitrogen molecules in addition to the required oxygen amount of 1.315 moles in Chemical Formula 4 above. If the air ratio is 1.3, it is approximately 8 moles.

Next, (6), the concentration of CH2.11O0.43, which is a mixed VOC gas, is determined in the exhaust gas 1 to which the required air amount of 8 mol has been added.
Since the average molecular weight of air is about 29, its weight required for complete combustion of CH2.11O0.43 is 29 × 8 = 232 g / mol. Therefore, the concentration (wt%) of the mixed VOC gas, that is, CH2.11O0.43, was 8% when the molecular weight of 20.99 was divided by the total amount of gas (232 + 20.99).
Therefore, it suffices if the mixed VOC gas (containing exhaust gas 1) of about 0.6% can be concentrated to the mixed VOC gas (containing concentrated gas 12) of about 6 to 8%.
In any case, the amount of air required to completely burn CH2.11O0.43, which is a mixed VOC gas of volatile organic compounds, can be sufficiently covered by the amount of air in exhaust gas 1 and concentrated gas 12. become. 21 (254 + X) = 0.06

Finally (7), the amount of heat generated considering the flow rate will be examined. For example, the flow rates of the exhaust gas 1 and the concentrated gas 12 are 10,000 Nm3 / h, and the concentration of CH2.11O0.43, which is a mixed VOC gas of volatile organic compounds, is 6%. Then, 6% of 10,000 Nm3 / h, that is, 600 Nm3 / h, generates 166.13 kcal per mole of the formula 4.
Therefore, the calorific value of 10,000 Nm3 / h is (600 × 1,000) /22.4 (l / mol) × 166 (kcal) = 4446,43 × 1,000 (kcal) = 1,060 MJ .
About an Example, it is as above.

It is a composition flow figure of a reference example which does not belong to the present invention about a processing system of a volatile organic compound. BRIEF DESCRIPTION OF THE DRAWINGS It is used for description of the best form for implementing invention about the processing system of the volatile organic compound which concerns on this invention, and is the structure flowchart of the example. It is a composition flow figure of a reference example which does not belong to the present invention about a processing system of a volatile organic compound.

DESCRIPTION OF SYMBOLS 1 Exhaust gas 2 Engine 3 Exhaust gas 4 Concentrator 5 Recovery device 6 Combustion device 7 Generator 8 Concentrated gas 9 Hot air 10 Purified air 11 Steam 12 Concentrated gas 13 Auxiliary fuel 14 Cooling water 15 Cooling part

Claims (1)

A processing system for exhaust gas 1 containing volatile organic compounds, comprising a concentrating device 4, a recovery device 5, a combustion device 6, and an engine 2,
The concentrating device 4 adsorbs the volatile organic compound contained in the supplied exhaust gas 1 and desorbs the adsorbed volatile organic compound by blowing hot air 9, thereby the volatile organic compound. To produce a concentrated gas 8 in which the compound is concentrated 2 to 50 times;
The recovery device 5 adsorbs the volatile organic compound contained in the concentrated gas 8 discharged and supplied from the concentration device 4 to a filter and blows the adsorbed volatile organic compound to the steam 11. Detach by attaching,
Thus, the concentrated gas 8 passes through the recovery device 5 and is discharged as a new purified concentrated gas 12.
The combustion device 6 combusts the concentrated gas 8 discharged and branchedly supplied from the concentrating device 4, and supplies hot air 9 based on combustion heat to the concentrating device 4 as desorption.
The engine 2 uses the volatile organic compound in the concentrated gas 12 supplied from the recovery device 5 as fuel, and supplies the exhaust gas 3 as hot air 9 to the concentration device 4 as desorption. A processing system for volatile organic compounds.

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