An energy-saving negative electrode material heat treatment volatile organic waste gas purification system

Abstract

The present invention discloses an energy-saving negative electrode material heat treatment volatile organic waste gas purification treatment system, comprising a sedimentation buffer whose air inlet is connected to an organic waste gas delivery pipe and realizes sedimentation of easily sedimentable substances in the organic waste gas, an explosion-proof mixed air system connected to the air outlet of the sedimentation buffer and realizes mixing of the organic waste gas with air, a thermal storage oxidation furnace connected to the air outlet of the explosion-proof mixed air system and oxidizing the organic waste gas, and an exhaust gas treatment system connected to the air outlet of the thermal storage oxidation furnace and purifying the exhaust gas discharged from the thermal storage oxidation furnace; in this solution, by providing a sedimentation buffer, sedimentation of sedimentary substances in the organic waste gas is first achieved before incineration, effectively avoiding the problem of carbon particles and asphalt deposition in the collection pipe during the incineration process. At the same time, the "water washing" process before organic waste gas treatment in the prior art is eliminated, avoiding secondary pollution and salvage operations of tar-containing hazardous wastes.

Description

Technical Field

[0001] The present invention belongs to the field of tail gas purification during thermal treatment of negative electrode materials, and more particularly relates to an energy-saving volatile organic waste gas purification system during thermal treatment of negative electrode materials. Background Art

[0002] The volatilization process of the negative electrode material during heat treatment under the protection of an inert gas such as nitrogen generates high concentrations of organic waste gas. This waste gas has a complex composition, a pale yellow color, and a strong, pungent odor. It primarily contains methane and other alkanes, alkenes, benzene, toluene, ethylbenzene, hydroxyl sulfide, hydrogen sulfide, methyl mercaptan, and carbon monoxide. The concentration of this organic waste gas is generally above 12,000 ppm, close to the explosion limit of methane. The waste gas is also hot and contains asphalt, tar, and a small amount of carbon black particles.

[0003] Thermal oxidation (incineration) is typically used to treat these organic waste gases. Conventional incineration processes can easily lead to the deposition of carbon particles and asphalt in the collection pipes, and can even cause clogging of the thermal storage ceramics in the incinerator's filter and preheating sections.

[0004] To address the aforementioned particulate matter deposition problem, the industry often performs water washing and spraying to remove asphalt, tar, and a small amount of carbon black particles (sedimentation) from the organic waste gas before it is passed into an incinerator for oxidation treatment. This treatment method significantly reduces the combustible components in the organic waste gas, but it not only generates a large amount of tar-containing hazardous waste, increasing the company's hazardous waste salvage and disposal costs, polluting the production environment, but also significantly increases the cost of auxiliary fuel during the incineration and oxidation process. Summary of the Invention

[0005] The purpose of the present invention is to provide an energy-saving negative electrode material heat treatment volatile organic waste gas purification system to solve the defects of organic waste gas treatment in the prior art.

[0006] The technical solution of the present invention is an energy-saving negative electrode material heat treatment volatile organic waste gas purification system, comprising a sedimentation buffer whose air inlet is connected to an organic waste gas conveying pipe and realizes sedimentation of easily precipitated substances in the organic waste gas, an explosion-proof mixed air system connected to the air outlet of the sedimentation buffer and realizes mixing of the organic waste gas with air, a thermal storage oxidation furnace connected to the air outlet of the explosion-proof mixed air system and oxidizing the organic waste gas, and an exhaust gas treatment system connected to the air outlet of the thermal storage oxidation furnace and purifying the exhaust gas discharged from the thermal storage oxidation furnace;

[0007] A slag discharge port is provided on the sedimentation buffer, and the slag discharge port is connected to an arc gasification system. The outlet of the arc gasification system is connected to a cyclone separator. The sedimentation material settled in the sedimentation buffer enters the arc gasification system through the slag discharge port and is gasified, and finally enters the cyclone separator to separate the carbon black particles. The gasified gas enters the explosion-proof mixed air system from the outlet of the cyclone separator.

[0008] Preferably, the air outlet of the thermal storage oxidation furnace is connected to a first air duct and a second air duct, and the other ends of the first air duct and the second air duct are respectively connected to a thermal oil heat exchanger and an air heat exchanger, and the exhaust gas after cooling by the thermal oil heat exchanger and the air heat exchanger enters the exhaust gas treatment system.

[0009] Preferably, a heating coil for heating the settled sediment material is provided at the bottom of the sedimentation buffer, and both ends of the heating coil are respectively connected to two oil ports of the thermal oil heat exchanger.

[0010] Preferably, the air heat exchanger includes a first air port, a second air port, a third air port and a fourth air port, the first air port and the second air port are connected, and are respectively connected to the second air duct and the exhaust gas treatment system; the third air port and the fourth air port are connected, the third air port is connected to the air inlet of the explosion-proof mixed air system, and the fourth air port is connected to a fresh air duct for inhaling external air.

[0011] Preferably, a proportional valve is provided on the fresh air duct, and the proportional valve is controlled by a pressure signal in the explosion-proof mixed air system, and delivers fresh air to the explosion-proof mixed air system as needed.

[0012] Preferably, the fresh air duct is also connected to a first pneumatic valve and a second pneumatic valve, and the first pneumatic valve and the second pneumatic valve are both connected in parallel with the proportional valve, and the first pneumatic valve and the second pneumatic valve are both controlled to open and close by the gas concentration signal in the explosion-proof mixed air system; two combustible gas alarms are provided in the explosion-proof mixed air system, and the two combustible gas alarms obtain the gas concentration in the explosion-proof mixed air system.

[0013] Preferably, the connection end of the fresh air duct and the air heat exchanger is connected to a bypass pipe through a tee, the bypass pipe is connected to the air heat exchanger in parallel and the other end is connected to the air inlet of the explosion-proof mixed air system.

[0014] Preferably, the organic waste gas conveying pipe is provided with an organic gas inlet regulating valve for regulating the pressure of the organic waste gas entering the sedimentation buffer.

[0015] Preferably, the arc gasification system is connected to a nitrogen inlet pipe, and the explosion-proof mixed air system is connected to a spray device for cooling the outside of the explosion-proof mixed air system.

[0016] Preferably, the exhaust gas treatment system includes an SCR denitrification system, a high-temperature bag dust collector, an alkali washing tower, a water washing tower, a centrifugal fan and a high-altitude emission chimney arranged in sequence; the exhaust gas discharged from the thermal storage oxidation furnace is cooled by the thermal oil heat exchanger and the air heat exchanger and then directly sent to the SCR denitrification system.

[0017] The technical solution of the present invention has the following beneficial effects:

[0018] 1. By providing a sedimentation buffer, sedimentation materials (asphalt, tar, and a small amount of carbon black particles) in organic waste gas are first settled before incineration, effectively avoiding the problem of carbon particles and asphalt being deposited in the collection pipe during the incineration process. At the same time, the "water washing" process before organic waste gas treatment in the existing technology is eliminated, avoiding secondary pollution and salvage operations of hazardous waste containing tar.

[0019] 2. Set up an arc gasification system and a cyclone separator to process the sedimentation material, gasify and separate the sedimentation material, and separate the carbon black particles. The carbon black particles can be reused as raw materials, and can even be shaped and used as negative electrode materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a system principle diagram of an energy-saving negative electrode material heat treatment volatile organic waste gas purification system according to the technical solution of the present invention. DETAILED DESCRIPTION

[0021] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described with reference to the accompanying drawings.

[0022] like Figure 1 The technical solution of the present invention is an energy-saving negative electrode material heat treatment volatile organic waste gas purification system, including a sedimentation buffer whose air inlet is connected to the organic waste gas conveying pipe 19 and realizes the sedimentation of easily precipitated substances in the organic waste gas (the main components of the sediment are asphalt, tar and a small amount of carbon black particles), an explosion-proof mixed air system connected to the air outlet of the sedimentation buffer and realizes the mixing of the organic waste gas with air, a thermal storage oxidation furnace connected to the air outlet of the explosion-proof mixed air system and oxidizes the organic waste gas, and an exhaust gas treatment system connected to the air outlet of the thermal storage oxidation furnace and purifies the exhaust gas discharged from the thermal storage oxidation furnace.

[0023] The main components of the above-mentioned easily precipitated substances are asphalt, tar and a small amount of carbon black particles. On the one hand, these substances have large particles and are easy to settle under their own gravity. On the other hand, their boiling points are relatively low, and they are the first to settle when the temperature of the organic waste gas drops.

[0024] Based on the above technical solution, after the organic waste gas is settled in the sedimentation buffer, the remaining waste gas enters the explosion-proof mixed air system and is evenly mixed with the air to obtain a mixed gas. The mixed gas enters the thermal storage oxidation furnace for incineration. After incineration, tail gas is obtained (the main components of the tail gas are carbon dioxide, nitrogen and water vapor, as well as a very small amount of nitrogen oxides). The tail gas then enters the tail gas treatment system to achieve cooling and remove nitrogen oxides, and finally emits low-temperature nitrogen and carbon dioxide into the air, which meets the emission standards.

[0025] In this technical solution, a settling buffer is installed to settle sediment (asphalt, tar, and a small amount of carbon black particles) in the organic waste gas before incineration, effectively preventing the accumulation of carbon particles and asphalt in the collection pipe during the incineration process. Furthermore, the "water washing" process before organic waste gas treatment, as is commonly done in existing technologies, is eliminated, avoiding secondary contamination and salvage operations involving hazardous tar-containing waste.

[0026] In this technical solution, the sedimentation buffer is equipped with a slag discharge port, which is connected to an arc gasification system. The outlet of the arc gasification system is connected to a cyclone separator. Sediment from the sedimentation buffer enters the arc gasification system through the slag discharge port, where it is gasified. Finally, it enters the cyclone separator, where the carbon black particles are separated. The gasified gas then enters the explosion-proof mixed air system through the cyclone separator's outlet.

[0027] Based on this technical solution, an arc gasification system, operating at temperatures above 1800°C, instantly vaporizes the asphalt and tar in the sediment. Under nitrogen protection, the vaporized asphalt and tar, along with the unvaporized carbon black particles, enter a cyclone separator, separating the carbon black particles from the vaporized gas. The vaporized gas then enters an explosion-proof mixing system, mixes with air, and enters a thermal oxidation furnace for incineration. The carbon black particles are collected and, after undergoing shaping and other processing, can be recycled and reused as raw material.

[0028] Based on the above technical solution, on the one hand, the sedimentation material is treated, solving the sedimentation material treatment problem; at the same time, the sedimentation material is converted into fuel, ensuring the combustible components of organic waste gas and reducing the use of auxiliary fuel; at the same time, the recycling and utilization of raw materials (carbon black particles) are realized, saving costs.

[0029] In the technical solution of the present invention, the outlet of the regenerative thermal oxidizer is connected to a first air duct 11 and a second air duct 12. The other ends of the first and second air ducts 11 and 12 are connected to a thermal oil heat exchanger and an air heat exchanger, respectively. The exhaust gas, after cooling through the thermal oil heat exchanger and the air heat exchanger, enters the exhaust gas treatment system. Specifically, the exhaust gas passing through the thermal oil heat exchanger and the air heat exchanger is connected to the air inlet of the SCR denitrification system in the exhaust gas treatment system via air ducts 16 and 17, respectively.

[0030] Based on the above technical solution, the exhaust gas discharged from the thermal storage oxidation furnace has a temperature of about 500°C, and is separated by the first air duct 11 and the second air duct 12 and enters the thermal oil heat exchanger and the air heat exchanger respectively, thereby utilizing the heat in the exhaust gas and reducing the exhaust gas temperature. This reduces the combustion cost on the one hand, and also reduces the exhaust gas treatment cost on the other.

[0031] High-temperature (around 500°C) exhaust gas enters the thermal oil heat exchanger, heating the oil inside to around 150°C to 180°C. The hot oil is then pumped into the sedimentation buffer. A heating coil is installed at the bottom of the buffer to heat the sedimentation material, with both ends of the heating coil connected to the two oil ports of the thermal oil heat exchanger. The high-temperature exhaust gas heats the oil in the thermal oil heat exchanger to around 150°C to 180°C, and then is pumped into the sedimentation buffer heating coil. The heating coil heats the sedimentation material (asphalt, tar, and a small amount of carbon black particles) that has settled in the sedimentation buffer. At this temperature, the sedimentation material inside the sedimentation buffer has completely taken on a fluid state (a small amount of carbon black particles forms a highly fluid black emulsion with the liquid asphalt and tar). The material is then slowly pumped into the arc gasification system (arc gasifier) ​​under the protection of an inert gas (nitrogen).

[0032] The temperature inside the arc gasifier exceeds 1800°C, instantly vaporizing the pumped asphalt and tar. Under the protection of nitrogen, the asphalt and tar are first separated from the carbon black particles in a cyclone separator. The vaporized asphalt and tar are then introduced through collection pipe 20 into an explosion-proof mixed air system, mixed with air, and then sent to the thermal oxidation furnace for incineration and oxidation into carbon dioxide and water. The carbon black particles separated by the cyclone separator are then shaped and used as the raw material for the negative electrode material.

[0033] In this technical solution, the air heat exchanger includes a first air port, a second air port, a third air port and a fourth air port. The first air port is connected to the second air port and is used to transport high-temperature exhaust gas.

[0034] That is, the first air port and the second air port are connected to the second air duct 12 and the exhaust gas treatment system respectively, and the second air port is connected to the air inlet of the SCR denitration system through the air pipe 17 .

[0035] The third air port is connected to the fourth air port. The third air port is connected to the air inlet of the explosion-proof mixed air system through the air pipe 15. The fourth air port is connected to the fresh air pipe 13 for sucking in external air. The external air enters the air heat exchanger through the fresh air pipe 13. The air is heated in the air heat exchanger and then transported to the explosion-proof mixed air system through the air pipe 15. The hot air with a certain temperature is transported to the explosion-proof mixed air system. On the one hand, the air is mixed with the organic waste gas to reduce the concentration of the organic waste gas, thereby preventing the organic waste gas concentration from being too high and reaching the explosion value. At the same time, it also provides sufficient oxygen for the combustion of the organic waste gas. In addition, the air with a certain temperature is transported to the explosion-proof mixed air system to ensure the internal temperature of the explosion-proof mixed air system. The temperature in the explosion-proof mixed air system is controlled between 80 and 150°C to prevent the temperature in the explosion-proof mixed air system from being too low, causing some high-boiling-point substances in the organic waste gas to condense and settle in the air mixing box.

[0036] In this technical solution, in order to ensure and control the air delivered to the explosion-proof mixed air system, a proportional valve 3 is provided on the fresh air pipe 13. The proportional valve 3 is controlled by the pressure signal obtained by the pressure transmitter in the explosion-proof mixed air system and delivers fresh air to the explosion-proof mixed air system on demand.

[0037] The specific operation of delivering fresh air on demand is as follows: a pressure sensor is installed in the explosion-proof mixed air system to obtain the pressure within the explosion-proof mixed air system. The pressure value is transmitted to the controller in real time. At the same time, a fixed pressure value within the explosion-proof mixed air system is input into the controller. The real-time pressure value and the fixed pressure value are used to control the operation of proportional valve 3 in real time. When the real-time pressure value is lower than the fixed pressure value, it is necessary to add air to the explosion-proof mixed air system. Proportional valve 3 opens and operates to add air to the explosion-proof mixed air system, so that the organic waste gas and air are mixed.

[0038] In this solution, the gas pressure in the explosion-proof mixed air system is controlled by both organic waste gas and air. A pressure transmitter is installed in the sedimentation buffer. The pressure transmitter obtains the pressure value in the sedimentation buffer and transmits the pressure value on the pressure transmitter to the controller. The controller controls the delivery proportional opening of the proportional valve 3 and adjusts the delivery volume of the explosion-proof mixed air system in real time according to the pressure of the organic waste gas in the sedimentation buffer. This can achieve proportional mixing of organic waste gas and air and ensure full oxidation of the organic waste gas.

[0039] An organic gas intake regulating valve 1 for regulating the pressure of the organic waste gas entering the sedimentation buffer is provided on the organic waste gas conveying pipe 19. The organic gas intake regulating valve 1 can be manually controlled or automatically controlled by a controller. The organic gas intake regulating valve 1 controls the gas flow rate and speed entering the sedimentation buffer, thereby controlling the gas pressure entering the sedimentation buffer. By controlling the gas pressure entering the sedimentation buffer, on the one hand, the amount and gas pressure of the organic waste gas entering the explosion-proof mixed air system can be controlled. The pressure of the organic waste gas entering, together with the fixed pressure value set in the explosion-proof mixed air system, can adjust the opening of the proportional valve 3 on the new light pipe 13, thereby delivering fresh air on demand. Delivering fresh air on demand can achieve a proportional mixing of organic waste gas and air, ensuring the full oxidation of the organic waste gas.

[0040] In the above technical solution, the organic gas inlet regulating valve 1 preferably controls the negative pressure of the sedimentation buffer to -20 Pa to -40 Pa. If the negative pressure in the sedimentation buffer is too low, volatiles cannot be discharged in a timely manner, resulting in unqualified volatile content in the product. If the negative pressure in the sedimentation buffer is too high, gas will be sucked into the heat treatment carbonization furnace through the inlet and outlet and sealing coils, causing safety accidents such as fire.

[0041] In this technical solution, the fresh air duct 13 is also connected to a first pneumatic valve 2 and a second pneumatic valve 4. Both valves are connected in parallel to the proportional valve 3. Their opening and closing are controlled by the gas concentration signal within the explosion-proof mixed air system. The explosion-proof mixed air system is equipped with two gas alarms that detect the gas concentration within the explosion-proof mixed air system.

[0042] Based on the above technical solution, the first pneumatic valve 2 and the second pneumatic valve 4 are linked to the two combustible gas alarms in the explosion-proof mixed air system, and the alarm action is set to have a gradient. For example, when the combustible gas concentration in the explosion-proof mixed air system reaches 60%, the first pneumatic valve 2 automatically opens, and the proportional valve 3 remains open. At this time, air enters through the first pneumatic valve 2 to dilute the concentration. When the combustible gas concentration in the explosion-proof mixed air system drops below 60%, it automatically closes, and the proportional valve 3 remains open and operates normally. When the combustible gas concentration reaches 65%, the second pneumatic valve 4 automatically opens to adjust the combustible gas concentration in the mixed air box. At this time, the proportional valve 3 remains open and operates normally. When the concentration drops, the second pneumatic valve 4 closes, and the proportional valve 3 operates alone.

[0043] In the above technical solution, the purpose of adjusting the gas pressure in the explosion-proof mixed air system by the first pneumatic valve 2 and the second pneumatic valve 4 is to reduce the concentration of combustible gas in the explosion-proof mixed air system so that the concentration of combustible gas does not reach the lower explosion limit. Otherwise, during operation, when the temperature in the explosion-proof mixed air system reaches above 250°C, an explosion may occur at any time.

[0044] In this technical solution, after the concentration of combustible gas in the explosion-proof mixed air system reaches the lower explosion limit, if the temperature in the explosion-proof mixed air system is too high, ignition energy is generated, causing the combustible gas in the explosion-proof mixed air system to explode. To this end, a bypass pipe 14 is provided for conveying unheated air to the explosion-proof mixed air system. That is, a bypass pipe 14 is connected to the connection end of the fresh air pipe 13 and the air heat exchanger via a tee. The bypass pipe 14 is connected to the air heat exchanger and its other end is connected to the air inlet of the explosion-proof mixed air system. This allows the air passing through the fresh air pipe 13 to directly enter the explosion-proof mixed air system through the bypass pipe 14, avoiding the problem of excessive temperature in the explosion-proof mixed air system. Solenoid valves 5 and 6 are provided on the bypass pipe 15 and the air pipe 15, respectively, to control the independent opening and closing of the bypass pipe 15 and the air pipe 15. Generally, when the temperature in the explosion-proof mixed air system is higher than 200°C, the fresh air does not pass through the air heat exchanger, the solenoid valve 6 is closed, the air pipe 15 is cut off, the solenoid valve 5 is opened, the bypass pipe 14 is connected, and the air is directly delivered to the explosion-proof mixed air system.

[0045] In this technical solution, the arc gasification system is connected to a nitrogen inlet pipe, and the explosion-proof mixed air system is connected to a sprinkler device that cools the exterior of the explosion-proof mixed air system. If the aforementioned temperature control measures within the explosion-proof mixed air system (without drawing fresh air through an air heat exchanger) fail to effectively lower the temperature within the explosion-proof mixed air system, the sprinkler device activates to spray the exterior of the explosion-proof mixed air system to cool the temperature. If the gas temperature within the explosion-proof mixed air system falls below a set value, the fire sprinkler system automatically shuts off.

[0046] In this technical solution, the exhaust gas treatment system includes an SCR denitrification system, a high-temperature bag filter, an alkali scrubber, a water scrubber, a centrifugal fan, and a high-altitude exhaust chimney, all arranged in sequence. The exhaust gas from the thermal regenerative oxidation furnace is cooled through a thermal oil heat exchanger and an air heat exchanger before being directly fed into the SCR denitrification system. The exhaust gas (carbon dioxide, nitrogen, water vapor, and trace amounts of nitrogen oxides) first enters the SCR denitrification system to remove nitrogen oxides, then enters a high-temperature bag filter to remove fine particulate matter. After dust removal, the gas enters an alkali scrubber and a water scrubber to absorb trace amounts of acidic gases such as sulfur dioxide that may be present. Finally, the flue gas is discharged into the high-altitude exhaust chimney through a centrifugal fan, completing the entire purification process.

[0047] This invention provides an energy-saving system for purifying volatile organic waste gas from thermal treatment of negative electrode materials. It effectively addresses the problem of asphalt and particulate matter deposited in collection pipes, eliminating the generation of hazardous waste. It also utilizes the inherent heat of the combustible gas to maintain the oxidation temperature of the waste gas, reducing the cost of auxiliary fuel. Based on an annual production capacity of 50,000 tons, this system can reduce hazardous waste disposal, manual salvage, and auxiliary fuel costs for manufacturers by over 6 million yuan annually.

[0048] The technical solution of the present invention is described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. An energy-saving negative electrode material heat treatment volatile organic waste gas purification system, characterized in that: The vents are routed through the vents to the exhaust pipe, which is then routed through the vents to the exhaust pipe, and the exhaust pipe is routed back through the vents to the exhaust pipe, and the exhaust pipe is routed back through the vents to the exhaust pipe. ;The air heat exchanger includes a first air port, a second air port, a third air port and a fourth air port, the first air port and the second air port are connected, and are respectively connected to the second air duct and the exhaust gas treatment system; the third air port and the fourth air port are connected, the third air port is connected to the air inlet of the explosion-proof mixed air system, and the fourth air port is connected to the fresh air duct that draws in external air; a proportional valve is provided on the fresh air duct, and the proportional valve is controlled by a pressure signal in the explosion-proof mixed air system, and delivers fresh air to the explosion-proof mixed air system as needed; the fresh air duct is also connected to a first pneumatic valve and a second pneumatic valve, both of which are connected to the proportional valve in parallel, and the first pneumatic valve and the second pneumatic valve are both opened and closed by a gas concentration signal in the explosion-proof mixed air system; two combustible gas alarms are provided in the explosion-proof mixed air system, and the two combustible gas alarms obtain the gas concentration in the explosion-proof mixed air system, A slag discharge port is provided on the sedimentation buffer, and the slag discharge port is connected to an arc gasification system. The outlet of the arc gasification system is connected to a cyclone separator. The sedimentation material settled in the sedimentation buffer enters the arc gasification system through the slag discharge port and is gasified, and finally enters the cyclone separator to separate the carbon black particles. The gasified gas enters the explosion-proof mixed air system from the outlet of the cyclone separator.

2. The energy-saving negative electrode material heat treatment volatile organic waste gas purification system according to claim 1 is characterized in that: The connecting end of the fresh air pipe and the air heat exchanger is connected to a bypass pipe through a tee. The bypass pipe is connected to the air heat exchanger in parallel and the other end is connected to the air inlet of the explosion-proof mixed air system.

3. The energy-saving negative electrode material heat treatment volatile organic waste gas purification system according to claim 1 is characterized in that: The organic waste gas conveying pipe is provided with an organic gas inlet regulating valve for regulating the pressure of the organic waste gas entering the sedimentation buffer.

4. The energy-saving negative electrode material heat treatment volatile organic waste gas purification system according to claim 1 is characterized in that: The arc gasification system is connected to a nitrogen inlet pipe, and the explosion-proof mixed air system is connected to a spray device for cooling the outside of the explosion-proof mixed air system.

5. The energy-saving negative electrode material heat treatment volatile organic waste gas purification system according to claim 1 is characterized in that: The exhaust gas treatment system includes an SCR denitrification system, a high-temperature bag dust collector, an alkali washing tower, a water washing tower, a centrifugal fan and a high-altitude emission chimney arranged in sequence; the exhaust gas discharged from the thermal storage oxidation furnace is cooled by the thermal oil heat exchanger and the air heat exchanger and then directly transferred to the SCR denitrification system.

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