VOC treatment method in process of producing battery negative electrode material in tunnel kiln

Abstract

The invention discloses a VOC treatment method in the process of producing a battery negative electrode material in a tunnel kiln, and belongs to the technical field of tunnel kiln VOC treatment. A VOC collection device is arranged in a heating section to capture high-concentration VOC waste gas; the waste gas is conveyed to the primary water spray tower and the secondary alkaline tower by a fan through a pipeline lined with a ceramic anti-corrosion layer; the first-stage water spray tower is used for removing large-particle dust and part of water-soluble organic matters and cooling to be less than or equal to 80 DEG C; a 5-10% NaOH solution is used for spraying in the second-stage alkaline washing tower to remove acid gas and tar substances; pretreated waste gas enters a catalytic combustion unit, after VOC concentration is diluted through an air mixing box, the waste gas is preheated through a plate heat exchanger, heated through a natural gas burner and decomposed in a catalyst fixed bed in sequence, high-temperature purified gas is exhausted after waste heat recovery, and the purified gas is guided into a chimney through an induced draft fan to be exhausted. Through the combined process of collecting, spraying and catalytic combustion, the total VOC removal rate of the process is greater than or equal to 98%.

Description

Technical Field

[0001] This invention belongs to the field of VOC treatment technology in tunnel kilns, and relates to a VOC treatment method in the process of producing battery anode materials in a tunnel kiln. Background Technology

[0002] Against the backdrop of the explosive growth of the lithium-ion battery industry, tunnel kilns, as core equipment for producing anode materials such as artificial graphite and mesophase carbon microspheres, are widely used in new energy vehicles and energy storage fields due to their high-temperature carbonization process (≥1000℃). In the production of anode materials, organic precursors such as petroleum coke and pitch coke undergo stages such as heating, high-temperature carbonization, and cooling in the tunnel kiln, transforming into carbon materials with a layered structure.

[0003] However, with the expansion of the industry, environmental compliance has become a key issue restricting enterprise development. Especially in the feeding stage (200-800℃), a large amount of light components in the organic precursors (such as benzene compounds and polycyclic aromatic hydrocarbons) volatilize, forming high-concentration VOC waste gas. Statistics show that approximately 3-5 kg ​​of VOCs are generated for every ton of anode material produced. These VOCs are complex in composition, and some are highly carcinogenic. Their emissions exacerbate environmental problems such as photochemical smog and ozone pollution, posing a serious threat to the ecological environment and human health.

[0004] Currently, the industry commonly uses a "direct discharge + simple water washing" method to treat VOC waste gas. However, this method is ineffective, with a VOC removal rate of less than 15%. Direct discharge of untreated waste gas not only causes serious air pollution but also exposes companies to hefty environmental fines and the risk of production shutdowns. Furthermore, the tar and dust components in VOCs easily adhere to the inner walls of pipes during emission, causing blockages and corroding equipment, increasing maintenance costs and impacting normal production and economic benefits. Summary of the Invention

[0005] The purpose of this invention is to provide a VOC treatment method in the process of producing battery anode materials in a tunnel kiln. By constructing an integrated process of "collection-two-stage spray pretreatment-catalytic combustion", it can achieve efficient removal of high-concentration and complex VOC waste gas in the heating section of the tunnel kiln.

[0006] The objective of this invention is achieved through the following technical solution: A method for VOC control during the production of battery anode materials in a tunnel kiln includes the following steps: Step 1: Several air inlet pipes are distributed in the heating section of the tunnel kiln. The air inlet pipes are connected to the main air inlet pipe and then connected to the inlet of the blower. Each air inlet pipe is equipped with an air inlet regulating valve to capture high-concentration VOC waste gas volatilized from the material. Step 2: The collected waste gas is transported by a fan to a two-stage spray tower pretreatment system through a pipe lined with a ceramic anti-corrosion layer. The two-stage spray tower pretreatment system consists of a primary water spray tower and a secondary alkaline scrubbing tower. The primary water spray tower removes large particulate dust and some water-soluble organic matter through circulating water spraying, while simultaneously cooling the gas to ≤80℃. The spray density is 30-50 m³ / (m²·h), and the waste gas residence time is 5-15 s. The secondary alkaline scrubbing tower uses a 5-10% NaOH solution spray to remove acidic gases and tar-like substances. The spray density is 35-50 m³ / (m²·h), and the waste gas residence time is 10-20 s. A sludge scraper is installed at the bottom of the secondary alkaline scrubbing tower to periodically discharge tar residue. Step 3: The pretreated waste gas enters the catalytic combustion unit, which includes a housing. A mixing box is installed at the air outlet of the housing to dilute the VOC concentration in the waste gas to below 25% of the lower explosive limit. The housing is equipped with a plate heat exchanger, a natural gas burner, and a catalyst fixed bed. The plate heat exchanger preheats the diluted waste gas by 200-250°C, and then the natural gas burner heats it to the catalyst activation temperature of 300-350°C. The VOC in the catalyst on the catalyst fixed bed decomposes into CO2 and H2O. The heat of reaction raises the temperature to 400-450°C to form high-temperature purified gas. The high-temperature purified gas recovers waste heat through the plate heat exchanger and is discharged from the exhaust port of the housing. Step 4: The purified gas discharged from the exhaust port of the box is guided into the chimney by the exhaust fan and then discharged. The method uses PLC integrated control to monitor the waste gas flow rate, temperature, and concentration parameters in real time, and automatically adjusts the spray volume and heating power.

[0007] As a further improvement of one embodiment of the present invention, an explosion-proof valve is installed on the pipe between the air outlet of the fan and the air inlet of the primary water spray tower in step 2.

[0008] As a further improvement of one embodiment of the present invention, the primary water spray tower in step 2 includes a water washing cylinder. The water washing cylinder is provided with a first spray plate, a first packing layer and a first demister. A water washing circulation pump is provided outside the water washing cylinder. The inlet of the water washing circulation pump is connected to the lower end of the water washing cylinder through a first pipe. A first switching valve is provided on the first pipe. The outlet of the water washing circulation pump is connected to the first spray plate through a second pipe. A first flow valve is provided on the second pipe. The first switching valve and the first flow valve are linked for control.

[0009] As a further improvement of one embodiment of the present invention, the secondary alkaline washing tower in step 2 includes an alkaline washing cylinder, a second spray plate, a second packing layer and a second demister are provided inside the alkaline washing cylinder, an alkaline solution circulation pump is provided outside the alkaline washing cylinder, the inlet of the alkaline solution circulation pump is connected to the lower end of the alkaline washing cylinder through a third pipe, a second switch valve is provided on the third pipe, the outlet of the alkaline solution circulation pump is connected to the second spray plate through a fourth pipe, a second flow valve is provided on the fourth pipe, and the second flow valve is linked to the second switch valve for control.

[0010] As a further improvement of one embodiment of the present invention, in step 3, the natural gas burner is connected to a natural gas system and an oxygen supply system respectively. The natural gas system includes a natural gas pipeline, on which a filter, a check valve, a pressure transmitter and a pressure gauge are sequentially arranged. The oxygen supply system includes an oxygen pipeline, on which an electric pump, an expansion joint and a filter are sequentially arranged.

[0011] As a further improvement of one embodiment of the present invention, the catalyst in step 3 is a supported noble metal catalyst with Pt / Pd as the active component.

[0012] A system for implementing the above method includes a VOC collection device, a fan, a two-stage spray tower pretreatment system, a catalytic combustion unit, and an induced draft fan connected in sequence. The catalytic combustion unit is equipped with a mixing box, a plate heat exchanger, a natural gas burner, and a catalyst fixed bed. The system is integrated and controlled by a PLC controller.

[0013] The above technical solution has the following beneficial effects: First, through the combined process of "collection + spraying + catalytic combustion", the total VOC removal rate is ≥98%, and the emission concentration is <50mg / m³, which is far below the national standard requirements; second, the spray tower pretreatment effectively removes tar and dust, avoids catalyst poisoning, and extends the equipment life by 3-5 years; third, the catalytic combustion waste heat recovery system can save more than 70% of heating energy consumption, and reduce the overall operating cost by 30%; fourth, the system has strong compatibility, does not require structural modification of the existing tunnel kiln, only requires the addition of a treatment unit outside the kiln body, and has no interference with the production process. Attached Figure Description

[0014] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0015] The structures, proportions, sizes, etc. shown in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0016] Figure 1 This is a schematic diagram of the tunnel kiln structure provided by the present invention.

[0017] Figure 2 This is a schematic diagram of the process provided by the present invention.

[0018] Figure 3 A schematic diagram of the combination of the two-stage spray tower pretreatment system and the catalytic combustion unit provided by the present invention. Detailed Implementation

[0019] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0020] First Embodiment

[0021] like Figure 2 , 3 As shown, the tunnel kiln consists of a heating section 1, a high-temperature section 2, and a cooling section 3. An air curtain fan 4 is installed at the front end of the tunnel kiln, generating a high-speed flowing "air barrier" (air curtain) to achieve isolation, sealing, and airflow control in the tunnel kiln entrance area. This invention aims to efficiently remove high-concentration, complex-composition VOC waste gas generated within the heating section 1 of the tunnel kiln. The specific method is as follows: Combination Figure 1 As shown, a VOC control method for the production of battery anode materials in a tunnel kiln includes the following steps: Step 1: Install a VOC collection device in the heating section of the tunnel kiln to capture high-concentration VOC waste gas emitted from the material. Specifically, the VOC collection device includes several inlet pipes 5-15 distributed along the heating section 1. The number of inlet pipes can be flexibly adjusted according to the actual scale of the tunnel kiln, the concentration and total amount of VOCs emitted from the material, and other factors. Each inlet pipe is equipped with an inlet regulating valve 16-26. By adjusting the opening of the inlet regulating valve, the air intake of each inlet pipe can be precisely controlled, thereby achieving flexible control of the VOC collection volume in different areas and ensuring that high-concentration VOC waste gas is fully captured.

[0022] Step 2: After the intake pipes 5-15 converge at the main intake pipe 27, they connect to the inlet of the fan 28, and the fan 28 transports the gas to the two-stage spray tower pretreatment system through the pipeline. To improve the overall corrosion resistance of the pipeline, all pipelines, including intake pipes 5-15 and the main intake pipe 27, are lined with a ceramic anti-corrosion layer. This pipeline structure not only effectively resists the erosion of corrosive substances in VOC waste gas and extends the service life of the pipeline, but also reduces the risk of waste gas leakage.

[0023] The two-stage spray tower pretreatment system in this scheme consists of a primary water spray tower 30 and a secondary alkaline scrubbing tower 35. The primary water spray tower 30 uses circulating water spraying to separate large particulate dust and some water-soluble organic matter from the waste gas through physical adsorption and dissolution, while simultaneously reducing the waste gas temperature to ≤80℃. The spray density is 30-50 m³ / (m²·h), and the waste gas residence time is 5-15 s, creating favorable conditions for subsequent treatment. The secondary alkaline scrubbing tower 35 uses a 5-10% NaOH solution spray, with a spray density of 35-50 m³ / (m²·h) and a waste gas residence time of 10-20 s. The NaOH solution reacts chemically with acidic gases and tar-like substances in the waste gas, achieving effective removal. A scraper installed at the bottom of the tower operates periodically to discharge the precipitated tar residue outside the tower, ensuring the normal operation of the secondary alkaline scrubbing tower.

[0024] In addition, the explosion-proof valve 29 installed on the pipeline between the air outlet of the fan 28 and the air inlet of the primary water spray tower 30 can promptly block the spread of flames in the event of an explosion or other accident, ensuring the safe and stable operation of the entire system.

[0025] Step 3: The pretreated exhaust gas enters the catalytic combustion unit. The catalytic combustion unit includes a housing 40. A mixing box 41 is installed at the air outlet of the housing 40. The mixing box 41 can dilute the VOC concentration in the exhaust gas to below 25% of the lower explosive limit by introducing fresh air, thereby ensuring the safety of the subsequent treatment process.

[0026] The housing 40 is equipped with a plate heat exchanger 42, a natural gas burner 48, and a catalyst fixed bed 43. The plate heat exchanger 42 utilizes the waste heat from the reaction to preheat the diluted waste gas to a temperature of 200-250℃. Then, the natural gas burner 48 further heats the waste gas, raising its temperature to the catalyst activation temperature of 300-350℃. At this point, the waste gas enters the catalyst fixed bed 43, where, under the action of the catalyst, the VOCs in the waste gas are efficiently decomposed into CO2 and H2O. The heat released during the reaction raises the temperature to 400-450℃, forming high-temperature purified gas. This high-temperature purified gas then passes through the plate heat exchanger 42 to recover waste heat, reducing energy consumption, and is finally discharged from the exhaust port of the housing 40.

[0027] In this scheme, a supported noble metal catalyst with Pt / Pd as the active component is used. The supporting material can be alumina, silica, or other materials with a large specific surface area and stable chemical properties. This catalyst can effectively promote the decomposition of VOCs in the waste gas and exhibits good activity and stability.

[0028] Step 4: The purified gas discharged from the exhaust port of the housing 40 is smoothly guided into the chimney 47 by the induced draft fan 46, and finally safely discharged into the atmosphere through the chimney 47. Among them, the above-mentioned VOC treatment method uses PLC integrated control to monitor the exhaust gas flow, temperature and concentration parameters in real time, and automatically adjusts the spray volume and heating power.

[0029] Combination Figure 3 As shown, the primary water spray tower 30 includes a water washing cylinder 301, with an exhaust port at the top for discharging the treated gas. Inside the water washing cylinder 301 are a first spray plate 302, a first packing layer 303, and a first demister 32. There are two sets of the first spray plate 302 and the first packing layer 303, and the first demister 32 is located above the first spray plate 302 and the first packing layer 303. This layout ensures that the gas undergoes spraying, filtration, and demisting treatment sequentially.

[0030] The washing cylinder 301 is equipped with a process water inlet A33 and a wastewater discharge outlet 315. Process water inlet A33 is used to connect the required process water, while wastewater discharge outlet 315 is used to discharge wastewater generated during the treatment process. A washing circulation pump 31 is installed outside the washing cylinder 301. The inlet of the washing circulation pump 31 is connected to the lower end of the washing cylinder 301 via a first pipe 311. A first switch valve 312 is installed on the first pipe 311 to control the flow of water. The outlet of the washing circulation pump 31 is connected to the first spray plate 302 via a second pipe 313. A first flow valve 314 is installed on the second pipe 313 to adjust the spray water volume. The first switch valve 312 and the first flow valve 314 are linked and controlled by a PLC, allowing for precise adjustment of the spray water volume and start / stop based on actual treatment conditions, ensuring effective treatment.

[0031] The secondary alkaline scrubbing tower 35 includes an alkaline scrubbing cylinder 351, with an exhaust port at the top for discharging the purified gas. Inside the alkaline scrubbing cylinder 351 are a second spray plate 352, a second packing layer 353, and a second demister 37. There are two sets of the second spray plate 352 and the second packing layer 353, and the second demister 37 is located above the second spray plate 352 and the second packing layer 353. This structure ensures that the gas sequentially passes through the sprayed alkaline solution, the packing layer, and undergoes sufficient contact reaction and demisting treatment.

[0032] The alkaline washing cylinder 351 is equipped with a process water inlet B38, an alkaline solution inlet 39, and an alkaline washing drain outlet 354. The process water inlet B38 allows for the connection of process water when necessary. The alkaline solution inlet 39 is used to introduce alkaline solutions such as 5-10% NaOH solution. The alkaline washing drain outlet 354 is used to discharge waste liquid after the reaction. An alkaline solution circulation pump 36 is installed externally on the alkaline washing cylinder 351. Its inlet is connected to the lower end of the alkaline washing cylinder 351 via a third pipe 355, on which a second switch valve 356 controls the flow of alkaline solution. The outlet is connected to the second spray plate 352 via a fourth pipe 357, on which a second flow valve 358 regulates the flow rate of alkaline solution. The second flow valve 358 and the second switch valve 356 are linked and controlled by a PLC to ensure stable alkaline solution circulation.

[0033] In addition, the water washing outlet 315 and the alkaline washing outlet 354 share the same sewage pipe 34, which facilitates the unified treatment of waste liquid.

[0034] In step 3, the natural gas burner is connected to both a natural gas system 44 and an oxygen supply system 45. Specifically, the natural gas system 44 mainly consists of a natural gas pipeline connected to the natural gas source. Filters are installed sequentially along the gas flow direction on the natural gas pipeline to remove impurities from the natural gas and prevent them from entering downstream equipment and causing damage. Check valves prevent backflow of gas, ensuring safe system operation. Pressure transmitters monitor the pressure of the natural gas in the pipeline in real time and transmit the pressure signal to the PLC control system. Pressure gauges display the natural gas pressure value visually for easy observation by operators.

[0035] The oxygen supply system 45 includes an oxygen pipeline connected to an oxygen source. An electric pump is installed sequentially on the oxygen pipeline to provide power for oxygen delivery; an expansion joint compensates for thermal expansion and contraction of the oxygen pipeline due to temperature changes and other factors, preventing pipeline damage; and a filter is used to filter out small particles in the oxygen, ensuring the purity of the oxygen entering the natural gas burner.

[0036] The above design ensures a stable and efficient combustion process, guaranteeing that the exhaust gas is heated to the catalyst activation temperature.

[0037] This invention addresses VOC waste gas treatment by establishing an intelligent operation and management system based on advanced PLC integrated control technology. This system can monitor key parameters such as waste gas flow rate, temperature, and concentration in real time with precision. By installing high-precision flow sensors, temperature sensors, and concentration detectors at key locations, the collected data is fed back to the PLC control system in real time. Based on this data, the system can automatically adjust the operating parameters of each treatment unit, such as adjusting the spray volume of the spray tower according to the waste gas flow rate and controlling the heating power of the natural gas burner according to the waste gas temperature. This ensures treatment efficiency and system stability, effectively reduces the cost of manual intervention, and minimizes the risks associated with human error.

[0038] A system for implementing the above-mentioned VOC waste gas treatment method includes a VOC collection device, a fan, a two-stage spray tower pretreatment system, a catalytic combustion unit, and an induced draft fan connected in sequence. The catalytic combustion unit is equipped with a mixing box, a plate heat exchanger, a natural gas burner, and a catalyst fixed bed. The system is integrated and controlled by a PLC controller.

[0039] This invention utilizes a combined process of "collection + spraying + catalytic combustion," achieving significant treatment effects. Actual testing shows a total VOC removal rate of ≥98% and an emission concentration of <50mg / m³, far below relevant national standards. The spray tower pretreatment stage efficiently removes impurities such as tar and dust from the waste gas, preventing them from entering the catalytic combustion unit and causing catalyst poisoning, thus extending equipment lifespan by 3-5 years. The catalytic combustion waste heat recovery system can recover and reuse the waste heat generated by the reaction, saving over 70% of heating energy consumption and reducing overall operating costs by 30%. Furthermore, this system is highly compatible, requiring no large-scale structural modifications to existing tunnel kilns; only the addition of a treatment unit outside the kiln is needed, causing no interference with normal production processes and facilitating widespread application.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for VOC control during the production of battery anode materials in a tunnel kiln, characterized in that, Includes the following steps: Step 1: Several air inlet pipes are distributed in the heating section of the tunnel kiln. The air inlet pipes are connected to the main air inlet pipe and then connected to the inlet of the blower. Each air inlet pipe is equipped with an air inlet regulating valve to capture high-concentration VOC waste gas volatilized from the material. Step 2: The collected waste gas is transported by a fan to a two-stage spray tower pretreatment system through a pipe lined with a ceramic anti-corrosion layer. The two-stage spray tower pretreatment system consists of a primary water spray tower and a secondary alkaline scrubbing tower. The primary water spray tower removes large particulate dust and some water-soluble organic matter through circulating water spraying, while simultaneously cooling the gas to ≤80℃. The spray density is 30-50 m³ / (m²·h), and the waste gas residence time is 5-15 s. The secondary alkaline scrubbing tower uses a 5-10% NaOH solution spray to remove acidic gases and tar-like substances. The spray density is 35-50 m³ / (m²·h), and the waste gas residence time is 10-20 s. A sludge scraper is installed at the bottom of the secondary alkaline scrubbing tower to periodically discharge tar residue. Step 3: The pretreated waste gas enters the catalytic combustion unit, which includes a housing. A mixing box is installed at the air outlet of the housing to dilute the VOC concentration in the waste gas to below 25% of the lower explosive limit. The housing is equipped with a plate heat exchanger, a natural gas burner, and a catalyst fixed bed. The plate heat exchanger preheats the diluted waste gas by 200-250°C, and then the natural gas burner heats it to the catalyst activation temperature of 300-350°C. The VOC in the catalyst on the catalyst fixed bed decomposes into CO2 and H2O. The heat of reaction raises the temperature to 400-450°C to form high-temperature purified gas. The high-temperature purified gas recovers waste heat through the plate heat exchanger and is discharged from the exhaust port of the housing. Step 4: The purified gas discharged from the exhaust port of the box is guided into the chimney by the exhaust fan and then discharged. The method uses PLC integrated control to monitor the waste gas flow rate, temperature, and concentration parameters in real time, and automatically adjusts the spray volume and heating power.

2. The VOC treatment method in the process of producing battery anode materials in a tunnel kiln according to claim 1, characterized in that, In step 2, an explosion-proof valve is installed on the pipe between the air outlet of the fan and the air inlet of the primary water spray tower.

3. The VOC treatment method in the process of producing battery anode materials in a tunnel kiln according to claim 1, characterized in that, The primary water spray tower in step 2 includes a water washing cylinder. Inside the water washing cylinder, there is a first spray plate, a first packing layer, and a first demister. Outside the water washing cylinder, there is a water washing circulation pump. The inlet of the water washing circulation pump is connected to the lower end of the water washing cylinder through a first pipe. A first switch valve is installed on the first pipe. The outlet of the water washing circulation pump is connected to the first spray plate through a second pipe. A first flow valve is installed on the second pipe. The first switch valve and the first flow valve are linked for control.

4. The VOC treatment method in the process of producing battery anode materials in a tunnel kiln according to claim 1, characterized in that, The secondary alkaline washing tower in step 2 includes an alkaline washing cylinder. Inside the alkaline washing cylinder, there is a second spray plate, a second packing layer, and a second demister. An alkaline solution circulation pump is installed outside the alkaline washing cylinder. The inlet of the alkaline solution circulation pump is connected to the lower end of the alkaline washing cylinder through a third pipe. A second switch valve is installed on the third pipe. The outlet of the alkaline solution circulation pump is connected to the second spray plate through a fourth pipe. A second flow valve is installed on the fourth pipe. The second flow valve and the second switch valve are linked for control.

5. The VOC treatment method in the process of producing battery anode materials in a tunnel kiln according to claim 1, characterized in that, In step 3, the natural gas burner is connected to both the natural gas system and the oxygen supply system. The natural gas system includes a natural gas pipeline, on which a filter, a check valve, a pressure transmitter, and a pressure gauge are sequentially installed. The oxygen supply system includes an oxygen pipeline, on which an electric pump, an expansion joint, and a filter are sequentially installed.

6. The VOC treatment method in the process of producing battery anode materials in a tunnel kiln according to claim 1, characterized in that, In step 3, the catalyst is a supported noble metal catalyst with Pt / Pd as the active component.

7. A system for implementing the method of any one of claims 1-6, characterized in that, The system includes a VOC collection device, a fan, a two-stage spray tower pretreatment system, a catalytic combustion unit, and an induced draft fan connected in sequence. The catalytic combustion unit contains a mixing box, a plate heat exchanger, a natural gas burner, and a catalyst fixed bed. The system is integrated and controlled by a PLC controller.

Images