Spraying curing waste gas collecting and treating equipment and using method thereof

Abstract

The invention provides spraying curing waste gas collection and treatment equipment and a using method thereof, and relates to the technical field of spraying curing waste gas collection and treatment.The spraying curing waste gas collection and treatment equipment comprises a pretreatment tank and a gas inlet pipe, the end, away from the pretreatment tank, of the gas inlet pipe fixedly communicates with a gas collection assembly used for collecting waste gas, and the other side of the pretreatment tank fixedly communicates with a gas guiding pipe; the end, away from the pretreatment tank, of the gas guiding pipe fixedly communicates with an oxidation catalysis waste gas purification assembly used for purifying waste gas, a circulating pump is fixedly installed at one end of the oxidation catalysis waste gas purification assembly, and the input end and the output end of the circulating pump fixedly communicate with a first backflow pipe and a second backflow pipe correspondingly; a spraying head used for pretreating waste gas is fixedly mounted at the bottom end of an inner cavity of the pretreatment tank, the working efficiency of waste gas collection is improved through the gas collection assembly, the waste gas is pretreated through the spraying head, equipment blockage caused by dust and particulate matter in the waste gas is avoided, and the waste gas which is not thoroughly purified is subjected to secondary treatment through the circulating pump.

Description

Technical Field

[0001] The present invention relates to the technical field of spray curing waste gas collection and treatment, and in particular to a spray curing waste gas collection and treatment device and a use method thereof. Background Art

[0002] Spray curing waste gas refers to the waste gas released during the curing process after the paint is sprayed during the spraying operation. These waste gases mainly contain volatile organic compounds, particulate matter and possible toxic gases, etc. These substances will affect the natural environment and cause damage to the human respiratory system. Therefore, in order to reduce its harm to the environment and human body, it is necessary to effectively treat the spray curing waste gas to ensure that the quality of waste gas emissions meets the standards.

[0003] Deficiencies in the prior art: Most of the spraying operations in the prior art are open, and cannot be effectively collected in a centralized manner, resulting in the exhaust gas flying everywhere, reducing the efficiency of the equipment in collecting the exhaust gas. During the treatment process, since the exhaust gas contains a large amount of dust and particulate matter, the treatment equipment in the prior art cannot pre-treat the exhaust gas. After long-term use, it will cause blockage of the internal filter structure of the equipment, and the exhaust gas that is not treated thoroughly cannot be treated for the second time, resulting in the exhaust gas failing to meet the emission standards, causing environmental pollution. Summary of the invention

[0004] The problem to be solved by the present invention is that the processing equipment in the prior art cannot collect waste gas in a centralized manner. During the processing process, it is impossible to pre-treat the larger dust and particulate matter in the waste gas, and the incompletely treated waste gas cannot be secondary treated, resulting in the problem of waste gas emissions not meeting the standards.

[0005] In order to solve the above technical problems, the present invention provides a spray curing waste gas collection and treatment device, comprising a pretreatment tank and an air intake pipe fixedly connected to one side thereof, wherein one end of the air intake pipe away from the pretreatment tank is fixedly connected to a gas collecting component for collecting waste gas, and the other side of the pretreatment tank is fixedly connected to an air duct, and one end of the air duct away from the pretreatment tank is fixedly connected to an oxidation catalytic waste gas purification component for purifying waste gas, and one end of the oxidation catalytic waste gas purification component is fixedly installed with a circulation pump, and the input end and the output end of the circulation pump are respectively fixedly connected to a first return pipe and a second return pipe, and the bottom end of the inner cavity of the pretreatment tank is fixedly installed with a spray head for pre-treating waste gas;

[0006] The oxidation catalytic exhaust gas purification component comprises a purification tank fixedly connected to the air induction pipe, and a catalyst layer and a carbon adsorption layer are fixedly connected to both sides of the inner cavity of the purification tank.

[0007] Preferably, one end of the first reflux pipe away from the circulation pump is connected to the middle of the inner cavity of the purification tank, and one end of the second reflux pipe away from the circulation pump is fixedly connected to one end of the purification tank close to the air duct.

[0008] Preferably, an air inlet and an air outlet are respectively provided at both ends of the purification tank, the purification tank is fixedly connected to the air duct through the air inlet, and the purification tank is fixedly connected to the air outlet pipe through the air outlet.

[0009] Preferably, a fan is provided at one end of the purification tank, the input end of the fan is fixedly connected to the air outlet pipe, and the output end of the fan is fixedly connected to the clean air exhaust pipe.

[0010] Preferably, the air collecting assembly comprises an air collecting hood fixedly connected to the air inlet pipe, a connecting groove is provided in the middle of the inner cavity of the air collecting hood, and a vacuum cleaner is fixedly installed in the inner cavity of the connecting groove.

[0011] Preferably, the position of the air inlet pipe corresponds to the position of the connecting groove and they are connected to each other.

[0012] Preferably, a sewage collection box is fixedly connected to the bottom end of the pretreatment tank, a filter plate is fixedly connected between the pretreatment tank and the sewage collection box, and one end of the sewage collection box is fixedly connected to a drain pipe.

[0013] Preferably, a water inlet pipe is fixedly connected to the middle of the top of the pretreatment tank, and the bottom end of the water inlet pipe passes through the middle of the top of the pretreatment tank and is fixedly connected to the top of the spray head.

[0014] The present invention also provides a method for using a spray curing waste gas collection and treatment device, comprising the following steps:

[0015] Step 1: First, install the gas hood at a suitable location according to the specific conditions of the spraying site. During the spraying process, start the vacuum cleaner so that the waste gas generated by spray curing in the air can accurately enter the air intake pipe through the gas hood and the connecting groove, and then enter the inner cavity of the pretreatment tank through the air intake pipe for pretreatment;

[0016] Step 2: Connect the water inlet pipe to the external water source. After the waste gas enters the inner cavity of the pretreatment tank, start the spray head to cool the waste gas in the inner cavity of the pretreatment tank through the spray head. At the same time, the dust and particulate matter carried in the waste gas are pre-processed. The flushed waste water enters the sewage collection box for centralized collection and treatment;

[0017] Step 3: After the pretreatment, the waste gas enters the inner cavity of the purification tank through the air duct, and the waste gas is oxidized and catalytically purified through the catalyst layer. After the purification, the waste gas passes through the carbon adsorption layer to remove the moisture and residual harmful substances therein. After the purification, the clean gas is discharged through the clean gas exhaust pipe. During the discharge process, the airflow generated by the fan forms suction, so that the waste gas can be collected and processed more quickly and comprehensively;

[0018] Step 4: When the exhaust gas is being processed in the inner cavity of the purification tank, the circulation pump is started, and the exhaust gas that has not been completely purified between the catalyst layer and the carbon adsorption layer is sucked into the first reflux pipe through the circulation pump, and the exhaust gas that has not been completely purified enters the inner cavity of the purification tank again through the second reflux pipe for secondary treatment, ensuring that the exhaust gas is completely purified.

[0019] Technical effects and advantages of the present invention:

[0020] 1. The present invention collects the exhaust gas in a centralized manner by providing an exhaust gas collecting component. According to the specific conditions of the spraying site, the exhaust gas collecting hood is installed at a suitable position. During the spraying process, a vacuum cleaner is started to allow the exhaust gas to enter the inner cavity of the exhaust gas collecting hood. The exhaust gas collecting hood can effectively prevent the exhaust gas from flying around, ensuring that the exhaust gas can be centrally collected. The exhaust gas enters the air inlet pipe through the connecting groove in the inner cavity of the exhaust gas collecting hood for centralized collection, thereby effectively improving the working efficiency of collecting the exhaust gas.

[0021] 2. The present invention pre-treats the collected exhaust gas by providing a pre-treatment tank. The exhaust gas entering the pre-treatment tank is sprayed through a spray head. The dust and particulate matter carried in the exhaust gas are washed away by the sprayed water mist to avoid the blockage of the internal filter structure of the equipment after long-term use by larger dust and particulate matter. The flushed waste water is collected and concentrated by a sewage collection box. At the same time, the spraying can cool the exhaust gas to a certain extent to avoid excessive temperature affecting the normal use of the equipment.

[0022] 3. The present invention provides a circulation pump to perform secondary treatment on the waste gas that is not completely purified in the inner cavity of the purification tank, extracts the waste gas that is not completely purified in the inner cavity of the purification tank through the first reflux pipe, and re-enters the waste gas through the input end of the purification tank through the second reflux pipe for secondary treatment and purification. The waste gas purified by the catalyst layer passes through the carbon adsorption layer again to adsorb residual substances and moisture in the waste gas, thereby ensuring that the waste gas meets the emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the internal structure of the pretreatment tank of the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of the oxidation catalytic exhaust gas purification component of the present invention.

[0026] Figure 4 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0027] Figure 5 It is a schematic diagram of the structure of the gas collecting assembly of the present invention.

[0028] Figure 6For the present invention Figure 4 A schematic diagram of the enlarged structure in the middle.

[0029] The accompanying drawings are marked as follows: 1. pretreatment tank; 2. air inlet pipe; 3. air collecting assembly; 31. air collecting hood; 32. connecting groove; 33. vacuum cleaner; 4. water inlet pipe; 5. air duct; 6. oxidation catalytic exhaust gas purification assembly; 61. purification tank; 62. air inlet; 63. air outlet; 64. catalyst layer; 65. carbon adsorption layer; 7. circulation pump; 8. first return pipe; 9. second return pipe; 10. air outlet pipe; 11. fan; 12. exhaust pipe; 13. sewage collection box; 14. sprinkler head; 15. filter plate; 16. drain pipe. DETAILED DESCRIPTION

[0030] The present invention provides a spray curing waste gas collection and treatment device, such as Figure 1 - Figure 6 As shown, it includes a pretreatment tank 1 and an air intake pipe 2 fixedly connected to one side thereof, the end of the air intake pipe 2 away from the pretreatment tank 1 is fixedly connected to a gas collecting component 3 for collecting exhaust gas, the other side of the pretreatment tank 1 is fixedly connected to an air duct 5, the end of the air duct 5 away from the pretreatment tank 1 is fixedly connected to an oxidation catalytic exhaust gas purification component 6 for purifying exhaust gas, one end of the oxidation catalytic exhaust gas purification component 6 is fixedly installed with a circulation pump 7, the input end and the output end of the circulation pump 7 are respectively fixedly connected to a first return pipe 8 and a second return pipe 9, a spray head 14 for pretreatment of exhaust gas is fixedly installed at the bottom end of the inner cavity of the pretreatment tank 1, the exhaust gas entering the inner cavity of the pretreatment tank 1 through the air intake pipe 2 is flushed through the spray head 14, because the spraying exhaust gas contains a large amount of dust and particulate matter, the dust and particulate matter therein are flushed away by spraying through the spray head 14, so as to avoid clogging of the internal filtering structure of the equipment after long-term use, thereby affecting the use effect of the equipment.

[0031] Further, such as Figure 3 As shown, the oxidation catalytic exhaust gas purification component 6 includes a purification tank 61 fixedly connected to the air duct 5, and a catalyst layer 64 and a carbon adsorption layer 65 are fixedly connected to both sides of the inner cavity of the purification tank 61. After the exhaust gas enters the inner cavity of the purification tank 61, it is first purified by the catalyst layer 64. Under the action of the catalyst, the organic oxides in the exhaust gas are decomposed into harmless substances. After the purification is completed, it passes through the carbon adsorption layer 65 to adsorb the residual substances and moisture therein to ensure that the exhaust gas meets the emission standards.

[0032] Further, such as Figure 1As shown, one end of the first reflux pipe 8 away from the circulation pump 7 is connected to the middle of the inner cavity of the purification tank 61, and one end of the second reflux pipe 9 away from the circulation pump 7 is fixedly connected to one end of the purification tank 61 close to the air duct 5. The exhaust gas that is not completely purified in the inner cavity of the purification tank 61 is extracted through the circulation pump 7 and the first reflux pipe 8, and then re-enters the purification tank 61 through the second reflux pipe 9 for purification treatment, ensuring that all the exhaust gas can be completely purified.

[0033] Further, such as Figure 3 and Figure 4 As shown, an air inlet 62 and an air outlet 63 are respectively provided at both ends of the purification tank 61. The purification tank 61 is fixedly connected to the air duct 5 through the air inlet 62, and the waste gas after pretreatment is transmitted to the inner cavity of the purification tank 61 through the air duct 5. The purification tank 61 is fixedly connected to the air outlet pipe 10 through the air outlet 63, and the waste gas after purification is discharged through the air outlet pipe 10.

[0034] Further, such as Figure 1 As shown, a fan 11 is provided at one end of the purification tank 61, and the input end of the fan 11 is fixedly connected to the outlet pipe 10, and the output end of the fan 11 is fixedly connected to the clean gas exhaust pipe 12. The exhaust gas after purification is discharged through the clean gas outlet pipe 10. During the discharge process, the exhaust gas can smoothly enter the oxidation catalytic exhaust gas purification component 6 through the fan 11, thereby ensuring the stability of the exhaust gas airflow inside the equipment and increasing the treatment effect. At the same time, the fan 11 enhances the conveying effect, reduces the resistance during the exhaust gas discharge process, and improves the emission efficiency.

[0035] Further, such as Figure 4 As shown, the air collecting component 3 includes an air collecting hood 31 fixedly connected to the air inlet pipe 2. The air collecting hood 31 is installed at a suitable position according to the specific conditions of the spraying site. A connecting groove 32 is opened in the middle of the inner cavity of the air collecting hood 31, and a vacuum cleaner 33 is fixedly installed in the inner cavity of the connecting groove 32. The vacuum cleaner 33 is started during the spraying process, and the exhaust gas enters the inner cavity of the air collecting hood 31 through the vacuum cleaner 33. The air collecting hood 31 can effectively prevent the exhaust gas from flying around, ensuring that the exhaust gas can be collected in a centralized manner.

[0036] Further, such as Figure 6 As shown, the position of the air intake pipe 2 corresponds to the position of the connecting groove 32 and they are connected to each other. The exhaust gas enters the air intake pipe 2 through the connecting groove 32 and is collected centrally, which effectively improves the working efficiency of collecting the exhaust gas.

[0037] Further, such as Figure 1 and Figure 2As shown, a sewage collecting box 13 is fixedly connected to the bottom end of the pretreatment tank 1. During the spraying process of the spray head 14, the wastewater generated is collected by the sewage collecting box 13 for centralized treatment. A filter plate 15 is fixedly connected between the pretreatment tank 1 and the sewage collecting box 13. One end of the sewage collecting box 13 is fixedly connected to a drain pipe 16.

[0038] Further, such as Figure 2 As shown, a water inlet pipe 4 is fixedly connected to the middle of the top of the pretreatment tank 1, and the bottom end of the water inlet pipe 4 passes through the middle of the top of the pretreatment tank 1 and is fixedly connected to the top of the spray head 14. An external water source is connected through the water inlet pipe 4 to provide water to the spray head 14 to perform pretreatment operations on the exhaust gas.

[0039] The present invention also provides a method for using the spray curing waste gas collection and treatment device, such as Figure 1 - Figure 6 As shown, the following steps are included:

[0040] Step 1: First, according to the specific conditions of the spraying site, install the air collecting hood 31 at a suitable position. During the spraying process, start the vacuum cleaner 33, so that the waste gas generated by spray curing in the air can accurately enter the air inlet pipe 2 through the air collecting hood 31 and the connecting groove 32. The air collecting hood 31 can effectively prevent the waste gas from flying around, ensuring that the waste gas can be collected centrally. The waste gas enters the inner cavity of the pretreatment tank 1 through the air inlet pipe 2 for pretreatment. The vacuum cleaner 33 effectively improves the efficiency of waste gas collection;

[0041] Step 2: Connect the water inlet pipe 4 to the external water source. After the waste gas enters the inner cavity of the pretreatment tank 1, start the spray head 14 to cool the waste gas in the inner cavity of the pretreatment tank 1 through the spray head 14. At the same time, pre-treat the dust and particulate matter carried in the waste gas to avoid the blockage of the internal filter structure of the equipment caused by large dust and particulate matter after long-term use. The flushed waste water enters the sewage collection tank 13 for centralized collection and treatment;

[0042] Step 3: After the pretreatment, the waste gas enters the inner cavity of the purification tank 61 through the air duct 5, and the waste gas passes through the catalyst layer 64 for oxidation catalytic purification. Under the action of the catalyst, the organic oxides in the waste gas are decomposed into harmless substances. The waste gas after purification passes through the carbon adsorption layer 65 to remove moisture and residual harmful substances therein. The clean gas after purification is discharged through the exhaust pipe 12. During the discharge process, the airflow generated by the fan 11 forms suction, so that the waste gas can be collected and processed more quickly and comprehensively;

[0043] Step 4: When the exhaust gas is treated in the inner cavity of the purification tank 61, the circulation pump 7 is started, and the exhaust gas that has not been completely purified between the catalyst layer 64 and the carbon adsorption layer 65 is sucked into the first reflux pipe 8 through the circulation pump 7. The exhaust gas that has not been completely purified enters the inner cavity of the purification tank 61 again through the second reflux pipe 9 for secondary treatment, ensuring that the exhaust gas is completely purified.

[0044] The working principle of the present invention is as follows: first, according to the specific conditions of the spraying site, the air collecting hood 31 is installed at a suitable position. During the spraying process, the vacuum cleaner 33 is started, so that the waste gas generated by spray curing in the air can accurately enter the air inlet pipe 2 through the air collecting hood 31 and the connecting groove 32. The air collecting hood 31 can effectively prevent the waste gas from flying around, ensuring that the waste gas can be collected centrally, and the waste gas enters the inner cavity of the pretreatment tank 1 through the air inlet pipe 2 for pretreatment. The vacuum cleaner 33 effectively improves the efficiency of waste gas collection, and connects the water inlet pipe 4 to the external water source. After the waste gas enters the inner cavity of the pretreatment tank 1, the spray head 14 is started, and the waste gas in the inner cavity of the pretreatment tank 1 is cooled by the spray head 14. At the same time, the dust and particulate matter carried in the waste gas are pre-processed to avoid the blockage of the internal filter structure of the equipment caused by large dust and particulate matter after long-term use, and the flushed waste water enters the sewage collection tank 13 is centrally collected and processed. After the pretreatment, the waste gas enters the inner cavity of the purification tank 61 through the air inlet pipe 5. The waste gas passes through the catalyst layer 64 for oxidation catalytic purification. Under the action of the catalyst, the organic oxides in the waste gas are decomposed into harmless substances. The waste gas after purification passes through the carbon adsorption layer 65 to remove moisture and residual harmful substances therein. The clean gas after purification is discharged through the clean gas exhaust pipe 12. During the discharge process, the airflow generated by the fan 11 forms suction, so that the waste gas can be collected and processed more quickly and comprehensively. When the waste gas is processed in the inner cavity of the purification tank 61, the circulation pump 7 is started, and the waste gas that has not been completely purified between the catalyst layer 64 and the carbon adsorption layer 65 is sucked into the first reflux pipe 8 by the circulation pump 7, and the waste gas that has not been completely purified enters the inner cavity of the purification tank 61 again through the second reflux pipe 9 for secondary treatment, so as to ensure that the waste gas is thoroughly purified.

[0045] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A spray curing waste gas collection and treatment device, comprising a pretreatment tank (1) and an air intake pipe (2) fixedly connected to one side thereof, characterized in that: The end of the air inlet pipe (2) away from the pretreatment tank (1) is fixedly connected to a gas collecting assembly (3) for collecting waste gas, the other side of the pretreatment tank (1) is fixedly connected to an air duct (5), the end of the air duct (5) away from the pretreatment tank (1) is fixedly connected to an oxidation catalytic waste gas purification assembly (6) for purifying waste gas, one end of the oxidation catalytic waste gas purification assembly (6) is fixedly installed with a circulation pump (7), the input end and the output end of the circulation pump (7) are respectively fixedly connected to a first return pipe (8) and a second return pipe (9), and the bottom end of the inner cavity of the pretreatment tank (1) is fixedly installed with a spray head (14) for pre-treating waste gas; The oxidation catalytic exhaust gas purification component (6) comprises a purification tank (61) fixedly connected to the air induction pipe (5), and a catalyst layer (64) and a carbon adsorption layer (65) are fixedly connected to both sides of the inner cavity of the purification tank (61).

2. The spray curing waste gas collection and treatment equipment according to claim 1 is characterized in that: One end of the first reflux pipe (8) away from the circulation pump (7) is in communication with the middle of the inner cavity of the purification tank (61), and one end of the second reflux pipe (9) away from the circulation pump (7) is fixedly connected with one end of the purification tank (61) close to the air duct (5).

3. The spray curing waste gas collection and treatment equipment according to claim 1 is characterized in that: An air inlet (62) and an air outlet (63) are respectively provided at both ends of the purification tank (61); the purification tank (61) is fixedly connected to the air duct (5) via the air inlet (62); and the purification tank (61) is fixedly connected to the air outlet pipe (10) via the air outlet (63).

4. The spray curing waste gas collection and treatment equipment according to claim 3 is characterized in that: A fan (11) is provided at one end of the purification tank (61); an input end of the fan (11) is fixedly connected to an air outlet pipe (10); and an output end of the fan (11) is fixedly connected to a clean air exhaust pipe (12).

5. The spray curing waste gas collection and treatment equipment according to claim 1 is characterized in that: The air collecting assembly (3) comprises an air collecting hood (31) fixedly connected to the air inlet pipe (2), a connecting groove (32) is provided in the middle of the inner cavity of the air collecting hood (31), and a dust collector (33) is fixedly installed in the inner cavity of the connecting groove (32).

6. The spray curing waste gas collection and treatment equipment according to claim 4 is characterized in that: The position of the air intake pipe (2) corresponds to the position of the connecting groove (32) and they are connected to each other.

7. The spray curing waste gas collection and treatment equipment according to claim 1 is characterized by: The bottom end of the pretreatment tank (1) is fixedly connected to a sewage collection box (13), a filter plate (15) is fixedly connected between the pretreatment tank (1) and the sewage collection box (13), and one end of the sewage collection box (13) is fixedly connected to a drainage pipe (16).

8. The spray curing waste gas collection and treatment equipment according to claim 1 is characterized by: The middle of the top of the pretreatment tank (1) is fixedly connected to a water inlet pipe (4), and the bottom end of the water inlet pipe (4) passes through the middle of the top of the pretreatment tank (1) and is fixedly connected to the top of the spray head (14).

9. A method for using a spray curing waste gas collection and treatment device, characterized in that: The following steps are involved: Step 1: First, according to the specific conditions of the spraying site, install the air collecting hood (31) at a suitable position, and during the spraying process, start the vacuum cleaner (33) so that the waste gas generated by spray curing in the air accurately enters the air intake pipe (2) through the air collecting hood (31) and the connecting groove (32), and the waste gas enters the inner cavity of the pretreatment tank (1) through the air intake pipe (2) for pretreatment; Step 2: Connect the water inlet pipe (4) to an external water source. After the waste gas enters the inner cavity of the pretreatment tank (1), start the spray head (14). The waste gas in the inner cavity of the pretreatment tank (1) is cooled by the spray head (14). At the same time, the dust and particulate matter carried in the waste gas are pre-processed. The flushed waste water enters the sewage collection box (13) for centralized collection and treatment. Step 3: After the pretreatment, the waste gas enters the inner cavity of the purification tank (61) through the air inlet pipe (5), and the waste gas passes through the catalyst layer (64) for oxidation catalytic purification. After the purification, the waste gas passes through the carbon adsorption layer (65) to remove moisture and residual harmful substances therein. After the purification, the clean gas is discharged through the clean gas exhaust pipe (12). During the discharge process, the airflow generated by the fan (11) forms suction, so that the waste gas can be collected and processed more quickly and comprehensively. Step 4: When the exhaust gas is being processed in the inner cavity of the purification tank (61), the circulation pump (7) is started, and the exhaust gas that has not been completely purified between the catalyst layer (64) and the carbon adsorption layer (65) is sucked into the first reflux pipe (8) through the circulation pump (7), and the exhaust gas that has not been completely purified enters the inner cavity of the purification tank (61) again through the second reflux pipe (9) for secondary treatment, thereby ensuring that the exhaust gas is completely purified.

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