JP2005342659A - Method and system for processing exhaust gas exhausted from coating facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and system for processing exhaust gas capable of suppressing the generation of CO<SB>2</SB>, and capable of efficiently processing a volatile organic compound contained in an exhaust gas exhausted from a coating facility with the reduction of a consumption energy. <P>SOLUTION: The exhaust gas processing system is equipped with a concentrator 20 for generating concentrated exhaust gas containing a concentrated volatile organic compound from the exhaust gas exhausted from the coating facility 10, an electron beam exhaust gas processor 30 destructively treating the volatile organic compound by irradiating the concentrated exhaust gas exhausted from this concentrator 20 with electron beams, and an ozone thermal decomposition apparatus 40 for decomposing ozone contained in the exhaust gas processed by the electron beam exhaust gas processor 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for treating exhaust gas discharged from a painting facility and a processing apparatus for exhaust gas.

  Volatile organic compounds are contained in the exhaust gas discharged from a painting facility for painting automobile bodies and parts, particularly from a paint baking furnace. High concentrations of volatile organic compounds have various effects on living organisms. Further, since the volatile organic compound has an odor even at a low concentration, the treatment of the volatile organic compound contained in the exhaust gas is required.

The treatment of the volatile organic compound contained in the exhaust gas is performed, for example, by blowing the exhaust gas from the paint baking furnace containing the volatile organic compound to a boiler or a combustion furnace, and combusting the combustible components to produce H ₂ O, CO _2. , H _{2 and} other non-toxic and odorless compounds. As this combustion treatment method, a direct combustion method in which heat treatment is performed at a high temperature of about 800 ° C. for about 1 second and a catalytic combustion method in which heat treatment is performed at a low temperature of about 400 ° C. using a catalyst such as platinum are widely used.

On the other hand, there is a processing method using an electron beam that generates less CO ₂ and processes exhaust gas at room temperature. As this exhaust gas treatment using an electron beam, an exhaust gas treatment apparatus is known in which exhaust gas containing SOx and NOx is guided to a reactor, NH ₃ is added, and electron beam irradiation is performed (for example, Patent Document 1). , See Patent Document 2).

JP 2000-176237 A JP 2000-834 A

However, according to the above-described combustion treatment method, a large amount of heat energy is required to burn the combustible component, and a large amount of CO ₂ is generated, which may cause an environmental impact. In addition, the generated heat causes a deterioration of the work environment around the processing equipment, and air conditioning equipment and maintenance costs are required to maintain an appropriate work environment by air conditioning. Furthermore, the processing facility for performing the combustion treatment requires a wide laying space, and the layout of a factory or the like is restricted.

Here, as a result of diligent research and experiments, the present inventors have focused on exhaust gas treatment including SOx and NOx by irradiation of an electron beam that treats exhaust gas at room temperature with little generation of CO _2. It was found that energy consumption and generation of CO ₂ can be suppressed by treating volatile organic compounds contained in the paint exhaust gas.

Accordingly, an object of the present invention made in view of the above point is to treat volatile organic compounds contained in exhaust gas that can suppress generation of CO ₂ , reduce energy consumption, and is efficiently discharged from a painting facility. An object of the present invention is to provide an exhaust gas treatment method and an exhaust gas treatment apparatus that are discharged from a painting facility that can perform the above-described processing.

  The invention of a method for treating exhaust gas discharged from a painting facility according to claim 1 that achieves the above object is a method for treating an exhaust gas containing a volatile organic compound discharged from a painting facility. An exhaust gas concentration step for generating a concentrated exhaust gas containing a volatile organic compound having a higher concentration than the exhaust gas, and an electron beam irradiation treatment step for destroying the volatile organic compound by irradiating the concentrated exhaust gas with an electron beam And an ozone decomposition step for decomposing ozone contained in the exhaust gas processed in the electron beam irradiation treatment step.

  The invention of a processing apparatus for exhaust gas discharged from a painting facility according to claim 2 that achieves the above object is a processing apparatus for exhaust gas containing a volatile organic compound discharged from the coating facility, and is exhausted from the coating facility. A concentrator that produces a concentrated exhaust gas containing a volatile organic compound having a higher concentration than the exhaust gas, and an electron that destroys the volatile organic compound by irradiating the concentrated exhaust gas discharged from the concentrator with an electron beam. A beam exhaust gas processing device and an ozone decomposition device for decomposing ozone contained in the exhaust gas processed by the electron beam exhaust gas processing device are provided.

  According to a third aspect of the present invention, there is provided an apparatus for treating exhaust gas discharged from a painting facility according to the second aspect, wherein the ozonolysis apparatus thermally decomposes ozone contained in the exhaust gas by a heating means. It is characterized by being.

  According to a fourth aspect of the present invention, there is provided a processing apparatus for exhaust gas discharged from the painting facility according to the second or third aspect, wherein the concentrator is 5: 1 with respect to the air volume of the exhaust gas discharged from the coating facility. Concentrated exhaust gas having an air volume of -10: 1 is generated.

  According to a fifth aspect of the present invention, there is provided a processing apparatus for exhaust gas discharged from the coating equipment according to any one of the second to fourth aspects, wherein the concentrator exhausts gas from the coating equipment passing through a rotating adsorption rotor. Rotating concentration in which the volatile organic compound contained in the adsorbing rotor is adsorbed by the adsorption rotor, and the desorption air passing through the adsorption rotor desorbs the volatile organic compound adsorbed by the adsorption rotor to generate the concentrated exhaust gas. The machine is characterized in that the treated exhaust gas from the painting facility that has passed through the adsorption rotor and the treated exhaust gas discharged from the ozone decomposition apparatus are mixed and discharged.

According to the first aspect of the present invention, a concentrated exhaust gas containing a volatile organic compound having a higher concentration than the exhaust gas discharged from the painting equipment in the exhaust gas concentration step is generated, and the concentrated exhaust gas is irradiated with an electron beam. By destroying volatile organic compounds and decomposing ozone contained in the exhaust gas treated in the electron beam irradiation treatment process, the volatile organic compounds contained in the exhaust gas can be treated. Compared with the combustion processing method, the consumption heat energy and the generation of CO ₂ can be greatly reduced. Furthermore, by concentrating the volatile organic workpieces contained in the exhaust gas discharged from the painting equipment in the exhaust gas concentration process, the amount of exhaust gas processed by electron beam irradiation in the electron beam irradiation process is reduced. Therefore, it can be expected to reduce the equipment cost and running cost.

According to the second aspect of the present invention, the exhaust gas discharged from the painting facility is concentrated by the concentrator, and then the volatile organic compound is destroyed by the electron beam irradiation by the electron beam exhaust gas processor, and the ozone heat Since ozone decomposition is performed by the decomposition apparatus, compared with the conventional combustion treatment method of paint exhaust gas, the consumption heat energy and the generation of CO ₂ can be greatly reduced.

  Furthermore, by concentrating the volatile organic compounds contained in the exhaust gas discharged from the painting equipment with a concentrator, the amount of exhaust gas that is destroyed by irradiating the electron beam with the electron beam exhaust gas processor is reduced. The required processing capacity of the electron beam exhaust gas processing machine is suppressed, so that the electron beam exhaust gas processing machine can be reduced in size and simplified, and the equipment cost and running cost can be suppressed.

  According to the invention of claim 3, by using an ozone pyrolysis device that thermally decomposes ozone contained in the exhaust gas by the heating means, the ozone pyrolysis temperature can be appropriately maintained by controlling the output of the heating means, Waste heat generated by the ozone pyrolyzer can be used to heat painting equipment.

  According to the invention of claim 4, the concentrated exhaust gas and the electron beam exhaust gas are generated by generating the concentrated exhaust gas having an air volume of 5: 1 to 10: 1 with respect to the air volume of the exhaust gas discharged from the painting facility by the concentrator. The processing efficiency by the processor can be secured.

  The invention of claim 5 shows a specific example of the concentrator and ozonolysis by mixing the treated exhaust gas from the painting facility that has passed through the adsorption rotor and the treated exhaust gas discharged from the ozone decomposing apparatus. The treated exhaust gas discharged from the apparatus can be diluted.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method for treating exhaust gas discharged from a painting facility and an apparatus for treating exhaust gas according to the present invention will be described below with reference to FIGS.

  FIG. 1 is an overall explanatory view showing an outline of a paint exhaust gas processing apparatus 1 and a processing method, FIGS. 2 and 3 are explanatory views of a concentrator, and FIG. 4 is an explanatory view of an ozone decomposition apparatus.

  Exhaust gas containing volatile organic compounds discharged from the painting facility 10 for coating automobile bodies and parts, that is, coating exhaust gas, is an exhaust gas concentration process I for concentrating volatile organic compounds, and this exhaust gas concentration process I The generated concentrated exhaust gas is irradiated with an electron beam to destroy the volatile organic compound, and the electron beam irradiation processing step II and the electron beam irradiation processing step II are irradiated with the electron beam to destroy the volatile organic compound. It is processed by an ozonolysis step III for decomposing ozone contained in the exhaust gas. The paint exhaust gas treatment apparatus 1 includes a concentrator 20, an electron beam exhaust gas treatment device 30, and an ozone pyrolysis device 40 that respectively perform an exhaust gas concentration process I, an electron beam irradiation treatment process II, and an ozone decomposition process III. ing.

  The painting facility 10 has an indirect combustion type baking and drying furnace 11 that dries paints such as automobile bodies and parts that have been painted, heats the circulating air in the furnace by a hot air circulation burner 12, and circulates it by a circulation fan 13. Thus, the furnace atmosphere of the baking and drying furnace 11 is kept constant.

  The pretreatment filter 15, the cooler 16, the concentrator 20, and the blower 29 are connected in order from the upper part of the painting facility 10 through the duct L1, and the electron beam exhaust gas processing device 30 and the ozone heat are connected from the concentrator 20 through the duct L2. A disassembling device 40 and a blower 69 are connected. The processed exhaust gas sent out by the blower 69 is mixed with the processed exhaust gas sent out from the blower 29 by the exhaust gas diluting device 70, diluted, and released.

  The exhaust gas containing the volatile organic compound in the painting facility 10 is drawn out by the blower 29 through the duct L1, and suspended matter such as a mist or viscous liquid paint or solvent contained in the exhaust gas by the pretreatment filter 15. Is removed. The pretreatment filter 15 is made of, for example, a steel net, and has low pressure loss and efficiently removes suspended matters such as mist-like or viscous liquid paints and solvents. The occurrence of problems such as clogging by adhering to the suction rotor 22 of the machine 20 is prevented.

  The exhaust gas from which the mist-like or viscous liquid suspended matter is removed by the pretreatment filter 15 is cooled to about 40 ° C. by the cooler 16 and supplied to the concentrator 20 that executes the exhaust gas concentration step I.

  The concentrator 20 is a rotary concentrator, and is rotated at a low speed, for example, about 3.5 rph by a rotary drive means such as a drive motor 21 as shown in the cross-sectional view along line AA in FIG. 2 and FIG. The suction rotor 22 has a disk shape or a cylindrical shape to be driven. The adsorption rotor 22 is formed in a disk shape or a cylindrical shape by spirally winding a honeycomb structure made of, for example, activated carbon fibers, and the exhaust gas cooled by the cooler 16 is sucked by the blower 29 and passes therethrough. On the other hand, an air intake 26 provided with a filter and a heater 27 such as an electric heater are provided, and the desorption air sucked through the duct L2 by the blower 69 and introduced from the air intake 26 is absorbed by the adsorption rotor 22. Then, the heater 27 is heated to, for example, about 200 ° C., passes through the adsorption rotor 22 again, and is sent to the electron beam exhaust gas processor 30 by suction of the blower 69.

  For example, the air volume β of the desorption air passing through the suction rotor 22 by suction of the blower 69 is 5 with respect to the air volume α per unit time of the exhaust gas sucked by the blower 29 and passing through the suction rotor 22. : 1 to 10: 1, that is, 1/5 to 1/10.

  In the adsorption rotor 22, an area in which the exhaust gas sucked by the blower 29 passes through the coating equipment 10 side passes through the adsorption zone 23, and an area through which the desorption air introduced from the air intake 26 through the blower 69 passes is the preparation zone 24. The region through which the desorption air heated by the heater 27 passes becomes the desorption zone 25.

  The exhaust gas containing volatile organic compounds sucked by the blower 29 and introduced from the coating equipment 10 side into the adsorption zone 23 of the adsorption rotor 22 is adsorbed and extracted by the adsorption rotor 22 while passing through the adsorption rotor 22. Then, the treated exhaust gas from which the volatile organic compound is removed and the residual volatile organic compound is extremely small is sent out to the exhaust gas dilution device 70 through the duct L3 by the blower 29.

  The volatile organic compound adsorbed and recovered by the adsorption rotor 22 is heated by the heater 27 in the desorption zone 25 and is desorbed by the desorption air passing through the adsorption rotor 22 and is discharged from the coating facility 10. A concentrated exhaust gas containing a higher concentration volatile organic compound is generated, and the concentrated exhaust gas is sent to the electron beam exhaust gas processor 30. Further, when the desorption air introduced from the air intake 26 in the preparation zone 24 passes through the adsorption rotor 22, volatile organic compounds remaining without being desorbed in the adsorption zone 25 are desorbed, and the heater 27 is To the desorption zone 25.

  In the concentrator 20, the concentrated exhaust gas sent to the electron beam exhaust gas processing device 30 through the desorption zone 25 with respect to the air volume α of the exhaust gas supplied from the coating equipment 10 side to the adsorption zone 25 and passes therethrough. By setting the air flow β to a ratio of 5: 1 to 10: 1, the exhaust gas containing the volatile organic matter introduced from the coating equipment 10 side into the concentrator 20 is concentrated about 5 to 10 times and volatilized. The concentrated exhaust gas containing the organic substance is sent to the electron beam exhaust gas processor 30. That is, the air volume β of the concentrated exhaust gas processed by the electron beam exhaust gas processor 30 is 5: 1 to 10: 1 with respect to the air volume α of the exhaust gas introduced into the concentrator 20 from the coating equipment 10 side, in other words. It can be reduced to 1/5 to 1/10.

  The electron beam exhaust gas processing device 30 that executes the electron beam irradiation processing step II irradiates the concentrated exhaust gas fed from the concentrator 20 into the chamber 31 with an electron beam and is contained in the concentrated exhaust gas. Is to destroy.

  The respective concentrations of volatile organic compounds contained in the concentrated exhaust gas introduced into the electron beam exhaust gas processing unit 30 and the electron beam exhaust gas processing unit 30 are processed at the inlet and the outlet of the electron beam exhaust gas processing unit 30, respectively. Measuring instruments 35 and 36 are provided for continuously measuring the concentration of each component of the volatile organic compound contained in the exhaust gas. The volatile organic compound is efficiently destroyed by controlling the irradiation amount of the electron beam in accordance with the concentration of each component of the volatile organic compound before treatment measured by the measuring instrument 35. Moreover, each component density | concentration of the volatile organic compound contained in the processed exhaust gas discharged | emitted from the electron beam discharge processing machine 30 by the measuring device 36 is always monitored. As these measuring instruments 35 and 35, a Fourier transform infrared absorption spectrophotometer capable of continuously measuring the concentration of each component of the volatile organic compound can be used.

  The exhaust gas containing ozone generated when the volatile organic compound is destroyed by the electron beam irradiation in the electron beam exhaust gas processing machine 30 executes an ozone decomposition step III for decomposing ozone contained in the exhaust gas. It is supplied to the ozone pyrolysis device 40.

  As shown in FIG. 4, the ozone pyrolysis apparatus 40 includes a cylindrical cylindrical portion 43 made of a stainless steel material having excellent corrosion resistance against exhaust gas and continuous in the vertical direction. It has a hollow container 42 that is long in the vertical direction and is formed by an upper surface portion 44 and a bottom surface portion 45 that seal the lower opening. A conduit 46 having an inlet 47 through which exhaust gas from the electron beam exhaust gas processor 30 at the lower side of the cylindrical portion 43 is introduced communicates. A bottomed cylindrical storage tank 48 is continuously formed below the bottom surface 45, and a treated gas outlet 49 communicates with the side surface of the storage tank 48.

  A bottomed cylindrical catalyst filling portion 51 formed by a side portion 52 and a bottom portion 53 is provided at an upper portion in the container 42. The catalyst filling section 51 divides the heat exchange section 54 into the lower heat exchange section 54 and the upper heating section 55 in the container 42 and heats the heat exchange section 54 and the heat by the side section 52 of the catalyst filling section 51 and the cylinder section 43 of the container 42. A communication portion 56 that communicates with the portion 55 is formed. The exhaust gas introduced from the inlet 47 in the heat exchanging portion 54 is partitioned in a labyrinth by a plurality of baffle plates 57 extending in the horizontal direction in order to secure a time for the exhaust gas to stay in the heat exchanging portion 54.

  A plurality of communication pipes 58 having one end communicating with the inside of the catalyst filling unit 51 and the other end communicating with the storage tank 48 via the bottom surface 45 are provided between the bottom 53 and the bottom surface 45 of the catalyst filling unit 51. Is provided inside. The plurality of communication pipes 58 spanned between the bottom part 53 and the bottom part 45 of the catalyst filling part 51 respectively penetrate the baffle plate 57 and are coupled so as to be able to transfer heat.

  A heating heater 61 such as an infrared heater serving as a heating unit is provided in the heating unit 55 formed above the catalyst filling unit 51. Further, a thermocouple 63 is disposed as a temperature detecting means for detecting the temperature of the catalyst filling unit 51. In the thermocouple 63, a tip 63 a that penetrates the upper surface portion 44 and serves as a temperature detection portion is set in the catalyst filling portion 51.

  Based on the temperature detection by the thermocouple 63, the output of the heater 61 is controlled by a control means (not shown) to heat the heating unit 55 to a preset temperature and keep the temperature of the catalyst filling unit 51 constant. That is, the output of the heater 61 is controlled based on temperature detection by the thermocouple 63 to heat the temperature of the heating unit 55 to a constant temperature of about 500 ° C., and the catalyst filling unit 51 is set to a constant temperature of about 500 ° C. Hold. The lower range in the catalyst filling unit 51 is filled with palladium 65 as a catalyst.

  As shown by the arrows in FIG. 4, the heat exchange section in which the treated exhaust gas in which the volatile organic compound has been destroyed by the electron beam exhaust gas processor 30 is formed in the container 42 from the inlet 47 through the conduit 46. Inject continuously into the lower part of 54. The exhaust gas injected into the lower part of the heat exchanging part 54 is guided along each baffle plate 57 and gently rises in the heat exchanging part 54 while meandering, and is supplied to the heating part 55 from the communication path 56. The exhaust gas supplied to the heating unit 55 is heated to, for example, about 500 ° C. by the heater 61 for heating. The heated exhaust gas is continuously formed in the heating unit 55, passes through the catalyst filling unit 51 filled with vanadium 65 as a catalyst, and is sent to the communication unit 58. At this time, the exhaust gas passing through the catalyst filling unit 51 is maintained at a constant temperature of about 500 ° C. by the heater 61 in the presence of palladium 65, and ozone is thermally decomposed into oxygen to become a processed exhaust gas. It is sent to the storage tank 48 via the passage 58, cooled by the storage tank 48, and then discharged from the treated gas outlet 49.

  Here, the high-temperature treated exhaust gas that has been heated and maintained at about 500 ° C. and has been subjected to thermal decomposition of ozone through the catalyst filling unit 51 circulates in the communication pipe 58 disposed in the heat exchange unit 54. The communication pipe 58 is heated in between, and each baffle plate 57 coupled to the communication pipe 58 is heated. On the other hand, the exhaust gas continuously injected from the inlet 47 to the lower part of the heat exchanging part 54 is guided along each baffle plate 57 in which a sufficient heat transfer area is secured, and gradually rises in the heat exchanging part 54. Heated by the communication pipe 58 and the baffle plate 57.

  In this way, the exhaust gas supplied to the catalyst filling unit 51 via the heating unit 55 is heated in advance in the heat exchanging unit 54, so that the consumption of electrical energy required to heat the exhaust gas by the heater 61 is reduced. While being able to suppress, efficient thermal decomposition is performed. Further, the waste heat generated by the ozone pyrolysis apparatus 40 is recovered and used for heating the indirect combustion type baking / drying furnace 11.

  The exhaust gas that has been subjected to the thermal decomposition of ozone by the ozone pyrolysis device 40 is sent to the exhaust gas dilution device 70 through the duct L4 by the blower 69, and is sent to the exhaust gas dilution device 70 through the duct L3 by the blower 29 in the exhaust gas dilution process IV. The processed exhaust gas to be supplied is diluted by being mixed with the processed exhaust gas, and the diluted processed exhaust gas is discharged to the outside of the paint exhaust gas processing apparatus 1.

According to the exhaust gas processing method and the exhaust gas processing apparatus 1 configured as described above, a concentrated exhaust gas containing a volatile organic compound having a higher concentration than the exhaust gas discharged from the coating facility 10 by the concentrator 20 is generated. This concentrated exhaust gas is subjected to destruction treatment of volatile organic compounds by electron beam irradiation by an electron beam exhaust gas processor 30, and exhaust gas containing ozone generated by electron beam irradiation is converted into ozone by an ozone pyrolysis device 40. Compared with the conventional paint exhaust gas combustion processing method, the heat consumption energy and the generation of CO ₂ can be greatly reduced, and the generated heat is also reduced to improve the work environment and the processing equipment. Therefore, it is possible to suppress the laying space such as a factory and avoid the restrictions on the layout of the factory.

  Further, the volatile organic compound contained in the exhaust gas discharged from the painting facility 10 is concentrated by the concentrator 20 so that the electron beam exhaust gas processor 30 irradiates the electron beam and destroys it. The amount of irradiation of the electron beam can be reduced, the required processing capacity of the electron beam exhaust gas processing machine 30 is suppressed, and the electron beam exhaust gas processing machine 30 can be reduced in size and simplified. The running cost can be reduced.

  The exhaust gas containing the volatile organic compound discharged from the painting facility 10 is supplied to the concentrator 20, and an actual measurement result of the recovery rate obtained by adsorbing the volatile organic compound to the adsorption rotor 22 by the concentrator 20 and collecting it is shown in FIG. Shown in

The air volume α of the exhaust gas from the duct L1 on the painting equipment 10 side is supplied to the adsorption zone 25 of the adsorption rotor 22 rotating at 3.5 rph at 10 Nm ³ / min, while the desorption air introduced from the air intake 26 is supplied. Of exhaust gas introduced into the concentrator 20 when the air flow rate β is 1 Nm ³ / min, passes through the preparation zone 24, and is heated to 180 ° C. by the heater 27 and passes through the adsorption zone 23. The result of having measured the total hydrocarbon concentration and the total hydrocarbon concentration of the processed exhaust gas discharged | emitted from the duct L3 is shown. As a result, the average measured concentration of total hydrocarbons in the exhaust gas before treatment introduced from the coating equipment 10 side is 883.8 ppm, whereas the treated exhaust gas recovered from the duct L3 that has passed through the adsorption rotor 22 is treated. The average measured concentration of gas was 65.4 ppm, and the recovery rate of total hydrocarbons by the adsorption rotor 22 of the concentrator 20 was 92.6%.

Further, the air volume α of the exhaust gas from the duct L1 on the coating equipment 10 side is supplied to the adsorption zone 25 of the adsorption rotor 22 rotating at 3.5 rph at 10 Nm ³ / min, while being removed from the air intake 26. The air flow rate β is 1.43 Nm ³ / min, which passes through the preparation zone 24, is heated to 180 ° C. by the heater 27 and is passed through the adsorption zone 23, and is introduced into the concentrator 20 when the concentration ratio is 7. The result of measuring the total hydrocarbon concentration of the exhaust gas and the total hydrocarbon concentration of the treated exhaust gas discharged from the duct L3 is shown. As a result, the average measured concentration of total hydrocarbons in the exhaust gas before treatment introduced from the coating equipment 10 side is 878.4 ppm, whereas the treated exhaust gas recovered from the duct L3 that has passed through the adsorption rotor 22 is treated. The average measured concentration of gas was 26.6 ppm, and the recovery rate of total hydrocarbons by the adsorption rotor 22 of the concentrator 20 was 97.0%.

  From the actual measurement results, the volatile organic compound contained in the exhaust gas supplied from the coating equipment 10 side by the concentrator 20 in the exhaust gas concentration step I can be recovered with high recovery efficiency, and the concentration factor is 7 to 10, in other words, the concentrator. By generating a concentrated exhaust gas having an air volume β of 7: 1 to 10: 1, that is, 1/7 to 1/10 of the air volume α of the exhaust gas discharged from the painting facility 10 by 20, sufficiently volatile organic It can be confirmed that the compound can be recovered and the processing efficiency by the concentrator 20 can be secured.

FIG. 6 shows a change in the processing efficiency of the total hydrocarbons contained in the concentrated exhaust gas when the electron beam is emitted to the exhaust gas by the electron beam exhaust gas processor 30. Concentrated exhaust gas 10-fold concentrated by the concentrator 20 is introduced into the chamber 31 at an air flow rate β of 1 m ³ / min, and the average processing efficiency when irradiated with a 35 mA electron beam at 150 kV is 43%. It was confirmed that the average processing efficiency was 36% when the exhaust gas was introduced into the chamber 31 of the electron beam processor 30 with an air volume of 10 m ³ / min and irradiated with a 35 mA electron beam at 150 kV. As a result, it can be confirmed that the destruction treatment efficiency of the volatile organic compound by the irradiation with the electron beam is improved by the concentration in the exhaust gas concentration step I which is the previous step of the electron beam irradiation treatment step II.

7 and 8 show the measurement results of the ozone concentration of the exhaust gas and the ozone concentration of the processed exhaust gas before the treatment of the ozone treatment step III by the ozone pyrolysis apparatus 40. FIG. The ozone concentration of the exhaust gas processed by the electron beam exhaust gas processing device 30 is supplied to the ozone pyrolysis apparatus 40 at an air volume of 1 Nm ³ / min, and the catalyst filling unit 51 is heated to 250 ° C. as a catalyst by 0.1%. It shows the change in ozone concentration of the treated exhaust gas contacted for 13 seconds, the average ozone concentration before treatment at the inlet of the ozone pyrolysis device 40 is 18.4 ppm, and the average after treatment at the outlet of the ozone pyrolysis device 40 It was confirmed that the ozone concentration was 0.708 ppm, the ozone decomposition rate was 96.1%, and sufficient ozone decomposition treatment was obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole explanatory drawing of the coating exhaust gas processing apparatus explaining embodiment of the processing method and exhaust gas processing apparatus of the exhaust gas discharged | emitted from the coating equipment by this invention. It is explanatory drawing of a concentrator. It is the sectional view on the AA line of FIG. 2 explaining the outline | summary of a concentration machine. It is explanatory drawing of an ozonolysis apparatus. It is a figure which shows the collection | recovery rate measurement result of the volatile organic compound by a concentrator. It is a figure which shows the change of the process efficiency of the total hydrocarbon contained in exhaust gas when an electron beam is irradiated to an exhaust gas with an electron beam exhaust gas processing machine. It is a figure which shows the ozone concentration measurement before the ozone decomposition process by an ozone thermal decomposition apparatus, and the ozone concentration measurement of the processed exhaust gas. It is a figure which shows the ozone concentration measurement before the ozone decomposition process by an ozone thermal decomposition apparatus, and the ozone concentration measurement of the processed exhaust gas.

Explanation of symbols

I Exhaust Gas Concentration Process II Electron Beam Irradiation Process III Ozone Decomposition Process IV Exhaust Gas Dilution Process 1 Coating Discharge Processing Device 10 Coating Equipment 11 Baking Drying Furnace 20 Concentrator 22 Adsorption Rotor 30 Electron Beam Exhaust Gas Processing Device 40 Ozone Thermal Decomposition Device 70 Exhaust gas dilution device

Claims (5)

In a method for treating exhaust gas containing volatile organic compounds discharged from a painting facility,
An exhaust gas concentration step for producing a concentrated exhaust gas containing a volatile organic compound having a higher concentration than the exhaust gas discharged from the painting facility;
An electron beam irradiation process for destroying volatile organic compounds by irradiating the concentrated exhaust gas with an electron beam;
A method for treating exhaust gas discharged from a painting facility, comprising: an ozone decomposition step for decomposing ozone contained in the exhaust gas treated in the electron beam irradiation treatment step. In the processing equipment for exhaust gas containing volatile organic compounds discharged from painting equipment,
A concentrator that produces concentrated exhaust gas containing a higher concentration of volatile organic compounds than the exhaust gas discharged from the painting facility;
An electron beam exhaust gas treatment machine that destroys volatile organic compounds by irradiating the concentrated exhaust gas discharged from the concentrator with an electron beam;
An apparatus for treating exhaust gas discharged from a painting facility, comprising: an ozone decomposing apparatus for decomposing ozone contained in exhaust gas processed by the electron beam exhaust gas processing machine. The ozonolysis apparatus
The apparatus for treating exhaust gas discharged from a painting facility according to claim 2, wherein the apparatus is an ozone pyrolysis device that thermally decomposes ozone contained in the exhaust gas by a heating means.   The said concentrator produces | generates the concentrated exhaust gas of a 5: 1-10: 1 air volume with respect to the air volume of the exhaust gas discharged | emitted from a coating facility, The coating equipment of Claim 2 or 3 characterized by the above-mentioned. Processing equipment for exhaust gas discharged. The concentrator is
The volatile organic compound contained in the exhaust gas from the coating equipment passing through the rotating adsorption rotor is adsorbed by the adsorption rotor, and the desorption air passing through the adsorption rotor is adsorbed by the adsorption rotor. Is a rotary concentrator that generates the concentrated exhaust gas by desorbing
The treated exhaust gas from the painting facility that has passed through the adsorption rotor and the treated exhaust gas discharged from the ozone decomposition apparatus are mixed and discharged. Equipment for treating exhaust gas discharged from the painting equipment described.

Images