Acid mist treatment system for nickel electrodeposition tank

Abstract

The utility model discloses an acid mist treatment system for a nickel electrodeposition tank. The nickel electrodeposition cell acid mist treatment system comprises an electrodeposition cell, an acid mist absorption unit and an air inducing module. The acid mist absorption unit comprises an absorption tower, a process water pipe, an alkali liquor pipe and a spraying module, the absorption tower is communicated with the electrodeposition cell, and the process water pipe, the alkali liquor pipe and the spraying module are all communicated with the absorption tower and are respectively used for introducing process water and alkali liquor and circularly spraying the process water and the alkali liquor; the air inducing module is respectively communicated with the absorption tower and the outside. Acid mist generated by the electrodeposition cell is guided into the acid mist absorption unit through a pipeline. After process water and alkali liquor are mixed and fully contacted with acid mist, a neutralization reaction is carried out, and a non-toxic and harmless gas product is generated. And the air inducing module generates negative pressure to accelerate discharge of gas products, so that normal operation of the acid mist absorption unit is ensured. The efficiency of neutralization reaction is improved, the environmental pollution is effectively reduced, and the harm of acid mist to equipment and personnel is avoided.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically to a nickel electrowinning tank acid mist treatment system. Background Technology

[0002] In electrolytic nickel projects, the nickel electrowinning process employs titanium insoluble anode plates. Nickel metal is deposited and precipitated on the cathode, thus achieving the purpose of metal extraction. The anode of the electrowinning cell uses a lead alloy anode or a titanium-iridium anode, and the cathode is a nickel starting plate. During the electrowinning process, an oxygen evolution reaction occurs on the anode plate, and the generated acid mist is captured, absorbed, and then discharged. Nickel ions in the solution are reduced and precipitated on the cathode to form the final product—electrowinning nickel.

[0003] Anodic process: At the insoluble anode, the following electrochemical reaction occurs: H₂O - 2e⁻ → 1 / 2O₂↑ + 2H⁺ + This reaction produces a large amount of oxygen and an equivalent amount of acid, increasing the acidity of the solution. Cathode process: The purpose of nickel electrodeposition is to precipitate relatively pure nickel on the cathode, with minimal or no hydrogen deposition. During electrodeposition, the primary reaction on the cathode is reduction: Ni... 2+ +2e=Ni. Nickel electrodeposition is carried out in an acidic solution, where hydrogen ions with a standard electrode potential more positive than nickel may discharge at the cathode to precipitate hydrogen gas: 2H+ + +2e=H2↑. The anode process is mainly the electrolysis of water, because H+... + The generation of acidic gases tends to decrease the pH value of the solution. When the room temperature is low, the oxygen released during anodic electrolysis carries away acidic gases, which condense into a large amount of acid mist. This can corrode the equipment in the nickel electrowinning plant and affect the health of workers. Low visibility affects the hoisting of electrode racks and plate racks by cranes, reducing the efficiency of nickel electrowinning production. It poses safety hazards and does not meet occupational health standards.

[0004] In summary, the existing electrowinning process suffers from technical problems such as excessive acid mist, reduced production efficiency, and potential safety hazards. Utility Model Content

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a nickel electrowinning cell acid mist treatment system to solve the technical problems of excessive acid mist, reduced production efficiency and safety hazards in the prior art.

[0006] To achieve the above-mentioned technical objectives, this application adopts the following technical solution:

[0007] This application provides a nickel electrodeposition cell acid mist treatment system, including an electrodeposition cell, an acid mist absorption unit, and an exhaust module.

[0008] Electrowinning cell;

[0009] An acid mist absorption unit includes an absorption tower, a process water pipe, an alkali pipe, and a spray module. The absorption tower is connected to the electrowinning tank. The process water pipe, the alkali pipe, and the spray module are all connected to the absorption tower and are used to introduce process water and alkali, and to circulate and spray the process water and alkali, respectively.

[0010] An exhaust fan module is connected to the absorption tower and is used to connect to the outside environment.

[0011] In some embodiments of this application, the absorption tower includes a tower body and a first packing layer, and the spray module includes a first spray head and a first spray pump;

[0012] The first packing layer is filled in the tower body, the first spray pump is connected to the cavity below the first packing layer and to the first spray head, and the first spray head is located above the first packing layer and facing the first packing layer.

[0013] In some embodiments of this application, the spray module further includes at least one second spray head, which is located above the first spray head and communicates with the first spray pump.

[0014] In some embodiments of this application, the absorption tower further includes at least one second packing layer, which is filled in the tower body and located between the first spray pump and the second spray pump.

[0015] In some embodiments of this application, the spray module further includes at least one second spray pump, which is connected to the tower body and to the first spray head and the second spray head, and the second spray pump is connected in parallel with the first spray pump.

[0016] In some embodiments of this application, the spray module further includes a first spray valve, a second spray valve, at least one third spray valve, and at least one fourth spray valve. The first spray valve and the second spray valve are respectively disposed at the inlet and outlet of the first spray pump, and the third spray valve and the fourth spray valve are respectively disposed at the inlet and outlet of the second spray pump.

[0017] In some embodiments of this application, the absorption tower further includes a wire mesh precipitator, which is filled in the tower body and located above the first spray head.

[0018] In some embodiments of this application, the induced draft module includes a first induced draft fan and a second induced draft fan. The first induced draft fan and the second induced draft fan are connected in parallel, and their inlets are both connected to the outlets of the electrowinning tank and the absorption tower, and their outlets are both connected to the outside.

[0019] In some embodiments of this application, the induced draft module further includes a first induced draft valve and a second induced draft valve, wherein the first induced draft valve is disposed at the inlet of the first induced draft fan and the second induced draft valve is disposed at the inlet of the second induced draft fan.

[0020] In some embodiments of this application, a first valve and a second valve are also included, wherein the first valve is disposed between the electrowinning tank and the induced draft module, and the second valve is disposed between the electrowinning tank and the absorption tower.

[0021] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include:

[0022] This application introduces acid mist generated by the electrowinning cell into an acid mist absorption unit via pipelines. In the absorption tower, process water and alkaline solution are mixed in a specific ratio to form a neutralizing liquid mixture. This mixture is circulated and sprayed through a spray module, increasing the contact area with the acid mist. After sufficient contact, a neutralization reaction occurs, generating non-toxic and harmless gaseous products. A negative pressure is generated by an induced draft module to accelerate the discharge of these gaseous products, ensuring the normal operation of the acid mist absorption unit. This improves the efficiency of the neutralization reaction, effectively reduces environmental pollution, and avoids harm to equipment and personnel caused by acid mist. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the embodiments will be briefly described below:

[0024] Figure 1 This is a schematic diagram of the structure of a nickel electrowinning tank acid mist treatment system provided in an embodiment of this application.

[0025] Figure label:

[0026] Electrolytic cell 1; acid mist absorption unit 2; exhaust fan module 3; chimney 4; first valve 5; second valve 6;

[0027] Absorption tower 21, first packing layer 211, second packing layer 212, wire mesh demister 213;

[0028] Process water pipe 22, alkali solution pipe 23;

[0029] Spray module 24, first spray head 241, first spray pump 242, second spray head 243, second spray pump 244, first spray valve 245, second spray valve 246, third spray valve 247, fourth spray valve 248;

[0030] First induced draft fan 31, second induced draft fan 32, first induced draft valve 33, second induced draft valve 34. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0032] Those skilled in the art will understand that, in this specification, the term "comprising" is an open-ended expression, meaning that the stated feature is present but other features are excluded. Directional terms such as "upper," "lower," "left," and "right" refer to exemplary directions based on the accompanying drawings. Features specified as "first" or "second" implicitly include one or more of that feature. Singular expressions can also be used in plural forms. "Multiple" means two or more. The terms "installed," "connected," and "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection via an intermediate medium, and it can be a connection within two components. Furthermore, "linked" can include wireless connections.

[0033] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a nickel electrowinning cell acid mist treatment system to solve the technical problems of excessive acid mist, reduced production efficiency and safety hazards in the prior art.

[0034] To achieve the above-mentioned technical objectives, this application adopts the following technical solution:

[0035] like Figure 1 As shown, this application provides a nickel electrodeposition cell acid mist treatment system, including an electrodeposition cell 1, an acid mist absorption unit 2, and an exhaust module 3.

[0036] Electrodeionization cell 1; The electrodeionization plant has multiple nickel electrodeionization cells 1. During the electrochemical reaction in the electrodeionization cells 1, oxygen is released and acidic gases are carried out. The acid mist is introduced into the acid mist absorption system through pipelines. Each electrodeionization cell 1 has multiple branch pipes of homopolymer polypropylene (Polyproplyene-Homo) connected to the main pipe.

[0037] The acid mist absorption unit 2 includes an absorption tower 21, a process water pipe 22, an alkali solution pipe 23, and a spray module 24. The absorption tower 21 is connected to the electrowinning tank 1, the process water pipe 22, and the alkali solution. The spray module 24 is connected to the absorption tower 21 at multiple points. The process water replenishes the absorption tower 21 to a suitable liquid level, and at the same time, the alkali solution is transported to the absorption tower 21 to form a mixed liquid with neutralization capacity.

[0038] The exhaust module 3 is connected to both the electrodeposition tank 1 and the outlet of the absorption tower 21, and its outlet is connected to the outside. The negative pressure generated by the exhaust module 3 can accelerate the extraction of oxygen and acid mist into the absorption tower 21, and also accelerate the discharge of the non-toxic and harmless gases generated by the neutralization reaction from the absorption tower 21, which are ultimately discharged to the outside through the chimney 4.

[0039] This application introduces the acid mist generated by the electrowinning cell 1 into the acid mist absorption unit 2 through a pipeline. In the absorption tower 21, process water and alkaline solution are mixed in a certain proportion to form a neutralizing liquid mixture. This mixture is lifted and dispersed into fine droplets by the spray module 24, thereby increasing the contact area with the acid mist. After sufficient contact between the mixture and the acid mist, a neutralization reaction occurs, generating non-toxic and harmless gaseous products. The induced draft module 3 generates negative pressure to accelerate the discharge of the gaseous products, ensuring the normal operation of the acid mist absorption unit 2. This improves the efficiency of the neutralization reaction, effectively reduces environmental pollution, and avoids the harm caused by acid mist to equipment and personnel.

[0040] In some embodiments of this application, the absorption tower 21 includes a tower body and a first packing layer 211, and the spray module 24 includes a first spray head 241 and a first spray pump 242;

[0041] The first packing layer 211 is filled in the tower body. The first spray pump 242 is connected to the cavity below the first packing layer 211 and to the first spray head 241. The first spray head 241 is located above the first packing layer 211 and faces the first packing layer 211.

[0042] The first spray pump 242 pumps the mixed liquid (a mixture of process water and alkali solution) to the first spray head 241. The liquid is then atomized by the first spray head 241 and sprayed downwards into the absorption tower 21, evenly distributing the mixed liquid above the first packing layer 211. The droplets are further dispersed as they pass through the first packing layer 211. Acidic waste gas enters from the lower part of the absorption tower (below the first packing layer 211) and gradually rises to fully contact the mixed liquid. As the acid mist passes through the first packing layer 211, it undergoes a neutralization reaction with the sprayed mixed liquid, generating non-toxic and harmless gaseous products. The neutralized gaseous products are discharged from the top of the tower and accelerated by the induced draft module 3 to ensure negative pressure inside the tower and maintain gas flow.

[0043] The first packing layer 211 fills the tower body to increase the contact area between the gas and liquid, promoting the neutralization reaction. The first packing layer 211 effectively disperses the liquid, increasing the contact area between the acid mist and the mixed liquid, thus improving neutralization efficiency. The cooperation of the first spray pump 242 and the spray head ensures uniform distribution of the mixed liquid, improving the acid mist treatment capacity.

[0044] In some embodiments of this application, the spray module 24 further includes at least one second spray head 243, which is located above the first spray head 241 and communicates with the first spray pump 242.

[0045] At least two spray layers are formed within the absorption tower 21. A first spray head 241 sprays a mixed liquid above the first packing layer 211, allowing the acid mist to contact the mixed liquid and undergo a neutralization reaction as it passes through the first packing layer 211. A second spray head 243 sprays the mixed liquid above the first spray head 241, providing additional neutralization opportunities for the acid mist. Thus, any acid mist not fully neutralized by the first spray layer continues to contact the mixed liquid sprayed by the second spray layer as it rises, undergoing further neutralization. This at least two-layer spray design provides the acid mist with more opportunities to contact the mixed liquid within the tower, thereby improving the thoroughness of the neutralization reaction.

[0046] The multi-layer spray design ensures more thorough contact between the acid mist and the mixed liquid, thereby improving neutralization efficiency. By adding spray layers, the unit can handle higher concentrations of acid mist, adapting to a wider range of production needs. Multi-layer spraying helps improve fluid dynamics within the tower, resulting in more uniform gas distribution and reducing short-circuiting. A more thorough neutralization reaction reduces the likelihood of acid mist emissions, lowering environmental pollution and safety hazards.

[0047] In some embodiments of this application, the absorption tower 21 further includes at least one second packing layer 212, which is filled in the tower body and located between the first spray pump 242 and the second spray pump 244.

[0048] The gas, after being treated by the first spray layer and the first packing layer 211, continues to rise to the second packing layer 212. Here, the residual acid mist in the gas will come into further contact with the liquid on the second packing layer 212 for deeper neutralization. The second spray head 243 is located above the second packing layer 212, and it sprays the mixed liquid again to ensure that the acid mist is fully neutralized as it passes through the second packing layer 212.

[0049] By incorporating a second packing layer 212, dual neutralization of acid mist is achieved, improving treatment efficiency. The addition of the second packing layer 212 increases the contact area and time between gas and liquid, thereby enhancing purification efficiency. For high-concentration or difficult-to-treat acid mist, the double-layer packing design can provide more powerful treatment capacity. The double-layer packing can share the burden of contamination and wear, thus extending the service life of the entire absorption tower. The number and position of spray heads and packing layers can be adjusted according to actual needs to adapt to different treatment requirements.

[0050] In some embodiments of this application, the spray module 24 further includes at least one second spray pump 244, which is connected to the tower body and to the first spray head 241 and the second spray head 243, and is connected in parallel with the first spray pump 242.

[0051] Both the first spray pump 242 and the second spray pump 244 are connected to the tower body and supply alkaline solution to the first spray head 241 and the second spray head 243, either separately or together. The first spray pump 242 and the second spray pump 244 are connected in parallel, meaning they can operate simultaneously, individually, or with their operating status adjusted as needed. Both spray pumps can supply solution to the first spray head 241 and the second spray head 243 simultaneously.

[0052] Using two spray pumps in parallel can balance the load, reduce the working pressure of a single pump, and extend its service life. If one spray pump fails, the other can continue to operate, ensuring the continuity and reliability of the acid mist treatment system. The operating status of the spray pumps can be adjusted according to the amount of acid mist generated, achieving flexible operation. The dual-pump system provides a higher level of safety, maintaining effective acid mist treatment even under peak load or single-pump failure conditions.

[0053] In some embodiments of this application, the spray module 24 further includes a first spray valve 245, a second spray valve 246, at least one third spray valve 247, and at least one fourth spray valve 248. The first spray valve 245 and the second spray valve 246 are respectively disposed at the inlet and outlet of the first spray pump 242, and the third spray valve 247 and the fourth spray valve 248 are respectively disposed at the inlet and outlet of the second spray pump 244.

[0054] When the first spray pump 242 is working, the first spray valve 245 opens, allowing the alkaline solution to flow into the pump, and the second spray valve 246 opens, allowing the pumped alkaline solution to flow to the spray head.

[0055] If the working pump malfunctions or requires maintenance, the backup pump can be switched to by closing the relevant valves of the working pump (first spray valve 245 and second spray valve 246) and opening the relevant valves of the backup pump (third spray valve 247 and fourth spray valve 248).

[0056] The one-in-operation, one-out-of-service configuration ensures that the system can quickly switch to the standby pump in the event of a problem with either spray pump, thus preventing interruption of acid mist treatment. While the standby pump is operating, the operating pump can be safely maintained and repaired without affecting the overall system operation. Under low-load conditions, only one spray pump can be operated, saving energy. The pump's operating mode can be adjusted according to actual needs to adapt to different production conditions and acid mist generation volumes.

[0057] In some embodiments of this application, the absorption tower 21 further includes a wire mesh demister 213, which is filled in the tower body and located above the first spray head 241.

[0058] The wire mesh demister 213 is typically located at the top of the tower or above the spray layer. When acid mist mixes with alkali solution in the spray layer and undergoes a neutralization reaction, some foam may be generated. The function of the wire mesh demister 213 is to capture and remove this foam, preventing it from being discharged from the tower with the gas. After the neutralization reaction, the gas passes through the wire mesh demister 213 as it rises; the foam is intercepted by the wire mesh, while the purified gas continues to rise and is discharged from the tower.

[0059] The wire mesh demister 213 effectively removes foam from the gas, further improving the gas purification level. It prevents foam from being discharged outside the tower with the gas, reducing environmental pollution. Foam removal prevents its accumulation in downstream equipment, thus protecting the normal operation of the equipment. By reducing foam generation and overflow, the overall performance and reliability of the absorption tower 21 are improved.

[0060] In some embodiments of this application, the air extraction module 3 includes a first air extraction fan 31 and a second air extraction fan 32. The first air extraction fan 31 and the second air extraction fan 32 are connected in parallel and their inlets are connected to the outlets of the electrosink 1 and the absorption tower 21, and their outlets are connected to the outside.

[0061] The first induced draft fan 31 and the second induced draft fan 32 are connected in parallel to form the induced draft module 3, which is used to generate negative pressure in the absorption tower 21 to promote gas flow. The inlet ends of both induced draft fans are connected to the electrodeposition tank 1 and the outlet of the absorption tower 21, while the outlet ends are connected to the external environment. This configuration allows the two induced draft fans to work simultaneously or individually as needed.

[0062] When the induced draft fan starts, a negative pressure is generated inside the absorption tower 21, causing the acid mist to flow from the electrodeposition tank 1 to the absorption tower 21, where it mixes with the alkaline solution and undergoes a neutralization reaction. The gaseous products after the neutralization reaction are discharged from the tower and released into the atmosphere by the suction of the induced draft fan.

[0063] Parallel induced draft fan configurations provide redundancy; if one fan fails, the other can still maintain normal system operation. Two fans can share the airflow, reducing the load on individual equipment and extending its lifespan. The operating mode of the induced draft fans can be adjusted according to actual needs to adapt to different production conditions.

[0064] In some embodiments of this application, the air-expelling module 3 further includes a first air-expelling valve 33 and a second air-expelling valve 34, wherein the first air-expelling valve 33 is disposed at the inlet of the first air-expelling fan 31 and the second air-expelling valve 34 is disposed at the inlet of the second air-expelling fan 32.

[0065] When the working induced draft fan needs maintenance or malfunctions, the system can be quickly switched to the standby induced draft fan by closing the working induced draft fan's induced draft valve and opening the standby induced draft fan's induced draft valve, ensuring continuous system operation.

[0066] The one-in-one-backup design ensures that the system can quickly switch to the backup fan in the event of a failure in either fan, thus ensuring uninterrupted acid mist treatment. Fan maintenance and repair can be performed without stopping the entire system. The choice of which fan to use and when to switch can be flexibly determined based on actual production needs and environmental conditions. Alternating between the two fans helps balance equipment wear and extend its service life.

[0067] In some embodiments of this application, a first valve 5 and a second valve 6 are also included, wherein the first valve 5 is disposed between the electrowinning tank 1 and the induced draft module 3, and the second valve 6 is disposed between the electrowinning tank 1 and the absorption tower 21.

[0068] When the absorption tower 21 is operating normally, the first valve 5 is closed and the second valve 6 is open. The waste gas enters the absorption tower 21 from the electrodeposition tank 1 through the second valve 6 for treatment.

[0069] When the absorption tower 21 needs maintenance, the second valve 6 is closed to isolate the absorption tower, and the first valve 5 is opened at the same time to allow the exhaust gas to directly enter the induced draft module 3 through the bypass and then be discharged.

[0070] By switching valves, the absorption tower 21 can be maintained without stopping the operation of the electrowinning tank 1, improving the continuity of the production line. The presence of valves provides operational flexibility, allowing for quick switching of the waste gas flow direction as needed.

[0071] After the acid mist treatment system was put into operation, the concentration of volatile acid mist in the plant was significantly reduced, and the acid concentration at a depth of 1.5m above the electrolytic cell was ≤5mg / m³. 3 During winter, there is almost no acid mist condensation inside the factory.

[0072] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include:

[0073] This application introduces the acid mist generated by the electrowinning cell 1 into the acid mist absorption unit 2 through a pipeline. In the absorption tower 21, process water and alkaline solution are mixed in a certain proportion to form a neutralizing liquid mixture. This mixture is lifted and dispersed into fine droplets by the spray module 24, thereby increasing the contact area with the acid mist. After sufficient contact between the mixture and the acid mist, a neutralization reaction occurs, generating non-toxic and harmless gaseous products. The induced draft module 3 generates negative pressure to accelerate the discharge of the gaseous products, ensuring the normal operation of the acid mist absorption unit 2. This improves the efficiency of the neutralization reaction, effectively reduces environmental pollution, and avoids the harm caused by acid mist to equipment and personnel.

[0074] Those skilled in the art will understand that the steps, measures, and schemes in the various operations, methods, processes, and procedures discussed in this application can be alternated, modified, rearranged, decomposed, combined, or deleted.

[0075] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. A nickel electrowinning tank acid mist treatment system characterized by, The application relates to an acid mist absorption device for an electro-deposition tank. The acid mist absorption device comprises an electro-deposition tank, an acid mist absorption unit, an air induction module, and a first valve and a second valve. The acid mist absorption unit comprises an absorption tower, a process water pipe, a lye pipe and a spraying module. The absorption tower is in communication with the electro-deposition tank.

2. The nickel electrowinning tank farm acid mist treatment system of claim 1, wherein, The spraying module is in communication with the absorption tower. The spraying module comprises a first spraying head and a first spraying pump.

3. The nickel electrowinning tank farm acid mist treatment system of claim 2, wherein, The first spraying pump is in communication with a cavity below the first packing layer and in communication with the first spraying head.

4. The nickel electrowinning tank farm acid mist treatment system of claim 3, wherein, The first spraying head is above the first packing layer and faces the first packing layer.

5. The nickel electrowinning tank farm acid mist treatment system of claim 4, wherein, The spraying module further comprises at least one second spraying head above the first spraying head and in communication with the first spraying pump.

6. The nickel electrowinning tank farm acid mist treatment system of claim 5, wherein, The spraying module further comprises at least one second spraying pump in communication with the tower body and in communication with the first spraying head and the second spraying head.

7. The nickel electrowinning tank farm acid mist treatment system of claim 3, wherein, The second spraying pump is in parallel with the first spraying pump.

8. The nickel electrowinning tank farm acid mist treatment system of claim 1, wherein, The absorption tower further comprises at least one second packing layer filled in the tower body and between the first spraying pump and the second spraying pump.

9. The nickel electrowinning tank farm acid mist treatment system of claim 8, wherein, The spraying module further comprises a first spraying valve, a second spraying valve, at least one third spraying valve and at least one fourth spraying valve.

10. The nickel electrowinning tank farm acid mist treatment system of claim 1, wherein, The first spraying valve and the second spraying valve are respectively arranged at the inlet and outlet of the first spraying pump. The third spraying valve and the fourth spraying valve are respectively arranged at the inlet and outlet of the second spraying pump. The absorption tower further comprises a wire mesh foam catcher filled in the tower body and above the first spraying head. The air induction module comprises a first air induction fan and a second air induction fan. The first air induction fan and the second air induction fan are in parallel and in communication with the outlet of the electro-deposition tank and the absorption tower. The air induction module further comprises a first air induction valve and a second air induction valve. The first air induction valve is arranged at the inlet of the first air induction fan. The second air induction valve is arranged at the inlet of the second air induction fan. The first valve is arranged between the electro-deposition tank and the air induction module. The second valve is arranged between the electro-deposition tank and the absorption tower.

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