A tail gas treatment method and system for lithium battery crushing recycling

Abstract

This invention discloses a method and system for treating exhaust gas from lithium battery crushing and recycling, comprising a dust removal device, a TO furnace, a waste heat boiler, a quench tower, an alkaline scrubbing tower, and a demister tower arranged sequentially; these are used for high-temperature dust removal, incineration, waste heat recovery, cooling, preliminary acid removal, and secondary acid removal of the exhaust gas, respectively. The dust removal device, through high-temperature dust removal, prevents the electrolyte in the exhaust gas from condensing during the dust removal process, thus preventing dust in the exhaust gas from combining with the viscous electrolyte, which would otherwise prevent the dust from passing through the metal filter screen of the dust removal device or even clogging the metal filter screen. This improves the dust removal efficiency of the dust removal device and solves the problems of low dust filtration efficiency and icing blockage caused by the condensation of electrolyte volatilized during lithium battery crushing.

Description

Technical Field

[0001] This invention belongs to the field of exhaust gas treatment, specifically relating to an exhaust gas treatment method and system for lithium battery crushing and recycling. Background Technology

[0002] With the development and popularization of new energy technologies, the use of lithium batteries has increased dramatically. When lithium batteries reach the end of their lifespan, a large number of waste lithium batteries are generated. To prevent environmental pollution from these waste batteries, they need to be processed, and their valuable metal resources recovered. However, the process of crushing and recycling lithium batteries generates a large amount of pyrolysis gas, which contains a large amount of organic matter, chlorides, fluorides, and sulfides. Direct emission of this gas will cause environmental pollution.

[0003] In existing technologies, such as patent document CN115569962A, a multi-stage condensation tail gas treatment system for a lithium battery drying system is disclosed. This system includes a treatment system comprising a condensation module and a water washing device, primarily treating the tail gas generated during lithium battery recycling through condensation and water washing. However, the condensation method is not highly efficient at removing harmful substances with low boiling points. The electrolyte volatilized during the lithium battery crushing process is viscous at low temperatures, making it difficult to filter after mixing with dust; furthermore, moisture is generated during condensation, posing a risk of freezing and blockage. Summary of the Invention

[0004] To address the problems in existing technologies, this invention proposes a method and system for treating exhaust gas from lithium battery crushing and recycling. By using high-temperature dust removal, the condensation of electrolyte generated during the crushing process of lithium batteries is prevented, thereby improving the dust filtration efficiency in the exhaust gas and solving the problems of low dust filtration efficiency and icing blockage caused by the condensation of electrolyte volatilized during the crushing process of lithium batteries.

[0005] This invention is implemented as follows: a method for treating exhaust gas from lithium battery crushing and recycling, applied to an exhaust gas treatment system for lithium battery crushing and recycling, the exhaust gas treatment system comprising a dust removal device, a TO furnace (Thermal Oxidizer, direct-fired thermal oxidizer), a waste heat boiler, a quench tower, an alkaline scrubbing tower, and a demister, arranged sequentially; the exhaust gas treatment method includes the following steps: S1: The exhaust gas generated during the crushing and recycling of lithium batteries is introduced into the dust removal device; S2: The dust removal device is equipped with a heating module to heat the exhaust gas to a set temperature, and then filter the dust in the exhaust gas through a metal filter screen. S3: The exhaust gas after dust removal is introduced into the TO furnace, which ignites the exhaust gas by gaseous fuel ignition, and then the exhaust gas itself is used as fuel for combustion. S4: The exhaust gas after incineration is introduced into a waste heat boiler, and the waste heat boiler exchanges heat with the exhaust gas after incineration to recover part of the heat of the exhaust gas after incineration and to initially cool the exhaust gas after incineration. S5: The exhaust gas after initial cooling is introduced into the quench tower, and the exhaust gas after initial cooling is cooled again by the quench tower, so that the exhaust gas is cooled to the set temperature range. S6: The cooled tail gas is passed into the alkaline scrubbing tower to initially remove acidic substances from the tail gas; S7: The exhaust gas, after the initial removal of acidic substances, is passed into the demister for a second removal of acidic substances from the exhaust gas. S8: Exhaust gas after emission treatment.

[0006] During the crushing process of lithium batteries, some electrolyte evaporates into the exhaust gas. This electrolyte condenses over time, becoming viscous and making it difficult to filter dust from the exhaust gas. This method uses high-temperature dust removal to prevent the electrolyte in the exhaust gas from condensing during the dust removal process. This avoids the dust in the exhaust gas combining with the viscous electrolyte, preventing the dust from passing through the metal filter of the dust removal device and potentially clogging it, thus improving the dust removal efficiency of the device.

[0007] Preferably, step S3 specifically includes the following steps: S3-1: The dust removal device is connected to the TO furnace through an insulated pipe or a heating pipe, so that the exhaust gas after dust removal is introduced into the TO furnace at a high temperature. S3-2: Set the lower limit of the temperature at which the exhaust gas is introduced into the TO furnace to a℃; S3-3: Calculate the transport distance of the exhaust gas from the preset temperature of the dust removal device to a℃ under the heat-insulated pipeline; S3-4: When the distance from the dust removal device to the TO furnace is less than the conveying distance, the dust removal device and the TO furnace are connected by an insulated pipe; when the distance from the dust removal device to the TO furnace is greater than the conveying distance, the dust removal device and the TO furnace are connected by a heating pipe. S3-5: The TO furnace ignites the exhaust gas by gaseous fuel, and then uses the exhaust gas itself as fuel for incineration.

[0008] Specifically, the value of 'a' ranges from 700 to 1000.

[0009] During the process of transporting the exhaust gas after dust removal to the TO furnace, heat loss occurs, causing the electrolyte in the exhaust gas to condense in the pipes. After prolonged use, this poses a risk of pipe blockage. Insulating or heating pipes can maintain the temperature of the exhaust gas. On the one hand, this prevents the electrolyte in the exhaust gas from condensing, thus avoiding blockage of the pipes by the viscous electrolyte. On the other hand, it reduces the heat that the exhaust gas needs to absorb to reach its ignition point, making the exhaust gas easier to burn and improving the efficiency of exhaust gas combustion.

[0010] Specifically, steps S3-5 include the following steps: S3-5-1: The TO furnace is ignited by gaseous fuel to form an initial flame. The initial flame ignites the exhaust gas introduced into the TO furnace. Then the supply of gaseous fuel is stopped, and the exhaust gas itself is used as fuel to burn the exhaust gas.

[0011] By using gaseous fuel to form the initial flame, the efficiency of igniting exhaust gases is accelerated, further improving the efficiency of exhaust gas combustion.

[0012] Preferably, step S4 further includes the following steps: S4-1: The waste heat boiler exchanges heat with the low-temperature gas and the exhaust gas after combustion, so that the low-temperature gas becomes high-temperature gas, and then the high-temperature gas is introduced into the dust removal device.

[0013] By recovering the heat from the exhaust gas after incineration, the energy consumption of the dust removal device is reduced, making it energy-saving and environmentally friendly.

[0014] A tail gas treatment system for lithium battery crushing and recycling is located at the end of the lithium battery crushing and recycling equipment and connected to the exhaust port of the lithium battery crushing and recycling equipment. It applies the above-mentioned tail gas treatment method and includes a dust removal device, a TO furnace, a waste heat boiler, a quench tower, an alkaline washing tower and a demisting tower arranged in sequence. The dust removal device includes a first heating module for preliminary heating of the exhaust gas, enabling the dust removal device to remove dust at a high temperature. It also includes a metal filter screen, the pores of which only allow gas to pass through, for removing dust from the exhaust gas. During the lithium battery crushing process, some electrolyte evaporates into the exhaust gas. This electrolyte in the exhaust gas condenses over time, becoming viscous and making it difficult to filter dust. This method, through high-temperature dust removal, avoids the condensation of the electrolyte in the exhaust gas during the dust removal process, preventing dust from combining with the viscous electrolyte and thus preventing dust from passing through the metal filter screen or even clogging it, thereby improving the dust removal efficiency of the device.

[0015] The exhaust gas after incineration is heat-recovered through a waste heat boiler, which also provides initial cooling. On the one hand, by recovering the heat from the exhaust gas after incineration, the energy consumption of the dust removal device is reduced, which is energy-saving and environmentally friendly. On the other hand, the initial cooling of the exhaust gas also reduces the load on the quench tower, which not only reduces the energy consumption of the quench tower but also extends its service life.

[0016] After initial cooling, the exhaust gas enters the quench tower for secondary cooling. The cooled exhaust gas then passes through the alkaline scrubbing tower and the demister tower for acid removal and purification before being discharged.

[0017] Preferably, a connecting pipe is provided between the dust removal device and the TO furnace, and the connecting pipe has an insulation layer or a heating layer on its outer periphery. Because the exhaust gas loses heat during its transport to the TO furnace, the electrolyte in the exhaust gas condenses in the pipe. After prolonged use, this poses a risk of pipe blockage. The insulation or heating pipe maintains the temperature of the exhaust gas, preventing electrolyte condensation and thus avoiding blockage. It also reduces the heat required for the exhaust gas to reach its ignition point, making it easier to burn and improving combustion efficiency.

[0018] Specifically, the insulation layer is made of heat-insulating material and is fitted onto the outer wall of the connecting pipe; the inner wall of the insulation layer is provided with a second heating module to form the heating layer, the second heating module including multiple spaced heating units or spirally extended heating units, so that the heating area of ​​the second heating module is adapted to the length of the connecting pipe.

[0019] Preferably, both the dust removal device and the connecting pipe are equipped with temperature sensors. These temperature sensors are used to monitor the temperature of the exhaust gas in real time, enabling timely detection and maintenance when the exhaust gas temperature unexpectedly drops below a set range.

[0020] Preferably, the waste heat boiler includes a heat exchanger, which comprises a heat absorption pipe and a heat release pipe thermally connected, and the outlet of the heat absorption pipe is connected to the dust removal device. The exhaust gas after incineration undergoes heat recovery through the waste heat boiler, which also provides initial cooling. On the one hand, by recovering the heat from the exhaust gas, the energy consumption of the dust removal device is reduced, resulting in energy conservation and environmental protection. On the other hand, the initially cooled exhaust gas also reduces the load on the quench tower, thereby reducing the energy consumption of the quench tower and extending its service life.

[0021] Preferably, the TO furnace further includes an ignition device, which is connected to an external fuel pipeline. By forming an initial flame with gaseous fuel, the efficiency of igniting the exhaust gas is accelerated, further improving the efficiency of exhaust gas combustion.

[0022] The beneficial effects of this invention are: This invention proposes a method and system for treating exhaust gas from lithium battery crushing and recycling. By using high-temperature dust removal, the electrolyte in the exhaust gas can be prevented from condensing during the dust removal process. This prevents the dust in the exhaust gas from combining with the viscous electrolyte, which would otherwise prevent the dust from passing through the metal filter screen of the dust removal device or even clogging the metal filter screen. This improves the dust removal efficiency of the dust removal device and solves the problems of low dust filtration efficiency and icing blockage caused by the condensation of the electrolyte volatilized during lithium battery crushing. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating the overall steps of the exhaust gas treatment method of the present invention. Figure 2 This is a detailed step diagram of step S3 in the exhaust gas treatment method of the present invention; Figure 3 This is a top view of the exhaust gas treatment system of the present invention.

[0024] Figure label: 1. Dust removal device; 2. TO furnace; 3. Waste heat boiler; 4. Quenching tower; 5. Alkali washing tower; 6. Demisting tower; 7. Connecting pipeline. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1 like Figures 1-2 As shown, a method for treating exhaust gas from lithium battery crushing and recycling is applied to an exhaust gas treatment system for lithium battery crushing and recycling. The exhaust gas treatment system includes a dust removal device 1, a TO furnace 2, a waste heat boiler 3, a quench tower 4, an alkaline scrubbing tower 5, and a demister tower 6, which are connected in sequence. The exhaust gas treatment method includes the following steps: S1: The exhaust gas generated during the crushing and recycling of lithium batteries is introduced into the dust removal device 1; S2: The dust removal device 1 is equipped with a heating module to heat the exhaust gas to a set temperature, and then filter the dust in the exhaust gas through a metal filter screen. S3: The exhaust gas after dust removal is introduced into TO furnace 2. The TO furnace 2 ignites the exhaust gas by gaseous fuel, and then the exhaust gas itself is used as fuel for incineration. S4: The exhaust gas after incineration is introduced into the waste heat boiler 3, and the waste heat boiler 3 exchanges heat with the exhaust gas after incineration to recover part of the heat of the exhaust gas after incineration and to initially cool the exhaust gas after incineration. S5: The exhaust gas after initial cooling is introduced into the quench tower 4. The quench tower 4 performs secondary cooling on the exhaust gas after initial cooling, so that the exhaust gas is cooled to the set temperature range. S6: The cooled tail gas is introduced into the alkaline scrubbing tower 5 to initially remove acidic substances from the tail gas. S7: The exhaust gas, after the acidic substances have been initially removed, is introduced into the demister 6 for a second removal of the acidic substances in the exhaust gas. S8: Exhaust gas after emission treatment.

[0027] During the crushing process of lithium batteries, some electrolyte evaporates into the exhaust gas. This electrolyte condenses over time, becoming viscous and making it difficult to filter dust from the exhaust gas. This method uses high-temperature dust removal to prevent the electrolyte in the exhaust gas from condensing during the dust removal process. This prevents dust from combining with the viscous electrolyte, thus avoiding dust from passing through the metal filter of the dust removal device 1 and potentially clogging the filter, thereby improving the dust removal efficiency of the dust removal device 1.

[0028] In this embodiment, step S3 specifically includes the following steps: S3-1: The dust removal device 1 is connected to the TO furnace 2 through an insulated pipe or a heating pipe, so that the exhaust gas after dust removal is introduced into the TO furnace 2 at a high temperature. S3-2: Set the lower limit of the temperature at which the exhaust gas is introduced into TO furnace 2 to a℃; S3-3: Calculate the conveying distance of the exhaust gas from the preset temperature of dust removal device 1 to a℃ under the heat-insulated pipeline; S3-4: When the distance from the dust removal device 1 to the TO furnace 2 is less than the conveying distance, the dust removal device 1 and the TO furnace 2 are connected by an insulated pipe; when the distance from the dust removal device 1 to the TO furnace 2 is greater than the conveying distance, the dust removal device 1 and the TO furnace 2 are connected by a heating pipe. S3-5: The TO furnace ignites the exhaust gas by gaseous fuel, and then uses the exhaust gas itself as fuel for incineration.

[0029] Specifically, the value of 'a' ranges from 800 to 900.

[0030] During the process of transporting the exhaust gas after dust removal to TO furnace 2, heat loss occurs, causing the electrolyte in the exhaust gas to condense in the pipes. After prolonged use, this poses a risk of pipe blockage. Insulating or heating pipes can maintain the temperature of the exhaust gas, preventing the electrolyte in the exhaust gas from condensing and thus avoiding blockage of the pipes by the viscous electrolyte. On the other hand, it reduces the heat that the exhaust gas needs to absorb to reach its ignition point, making the exhaust gas easier to burn and improving the efficiency of exhaust gas incineration.

[0031] Specifically, steps S3-5 include the following steps: S3-5-1: TO furnace 2 is ignited by gaseous fuel to form an initial flame. The initial flame ignites the exhaust gas introduced into TO furnace 2. Then the supply of gaseous fuel is stopped, and the exhaust gas itself is used as fuel to burn the exhaust gas.

[0032] By using gaseous fuel to form the initial flame, the efficiency of igniting exhaust gases is accelerated, further improving the efficiency of exhaust gas combustion.

[0033] In this embodiment, step S4 further includes the following steps: S4-1: The waste heat boiler 3 exchanges heat between the low-temperature gas and the exhaust gas after combustion, so that the low-temperature gas becomes high-temperature gas, and then the high-temperature gas is introduced into the dust removal device 1.

[0034] By recovering the heat from the incinerated exhaust gas, the energy consumption of the dust removal device 1 is reduced, which is energy-saving and environmentally friendly.

[0035] Example 2 like Figure 3 As shown, a tail gas treatment system for lithium battery crushing and recycling is located at the end of the lithium battery crushing and recycling equipment and connected to the exhaust port of the lithium battery crushing and recycling equipment. It applies the tail gas treatment method described in Example 1 and includes a dust removal device 1, a TO furnace 2, a waste heat boiler 3, a quench tower 4, an alkaline washing tower 5, and a demisting tower 6 arranged in sequence. The dust removal device 1 includes a first heating module for preliminary heating of the exhaust gas, enabling the dust removal device 1 to remove dust at a high temperature. It also includes a metal filter screen, the pores of which only allow gas to pass through, for removing dust from the exhaust gas. During the lithium battery crushing process, some electrolyte evaporates into the exhaust gas. This electrolyte in the exhaust gas condenses over time, becoming viscous, making it difficult to filter dust from the exhaust gas. This method, through high-temperature dust removal, avoids the condensation of the electrolyte in the exhaust gas during the dust removal process, preventing dust from combining with the viscous electrolyte and thus preventing dust from passing through the metal filter screen of the dust removal device 1, or even clogging the metal filter screen, thereby improving the dust removal efficiency of the dust removal device 1.

[0036] In this embodiment, a connecting pipe 7 is provided between the dust removal device 1 and the TO furnace 2. The connecting pipe 7 connects the dust removal device 1 and the TO furnace 2, and an insulation layer or a heating layer is provided on the outer periphery of the connecting pipe 7. Because the exhaust gas after dust removal loses heat during its transport to the TO furnace 2, the electrolyte in the exhaust gas condenses in the pipe. After prolonged use, this poses a risk of pipe blockage. The insulation or heating pipe maintains the temperature of the exhaust gas, preventing the electrolyte in the exhaust gas from condensing and thus avoiding blockage by the viscous electrolyte. Furthermore, it reduces the heat required for the exhaust gas to reach its ignition point, making the exhaust gas easier to burn and improving the efficiency of exhaust gas combustion.

[0037] Specifically, the insulation layer is made of heat-insulating material and is fitted onto the outer wall of the connecting pipe 7; the inner wall of the insulation layer is provided with a second heating module to form the heating layer, the second heating module including multiple spaced heating units or spirally extended heating units, so that the heating area of ​​the second heating module is adapted to the length of the connecting pipe 7.

[0038] In this embodiment, both the dust removal device 1 and the connecting pipe 7 are equipped with temperature sensors. The temperature sensors are used to monitor the temperature of the exhaust gas in real time, and can promptly detect and address any unexpected drops in the exhaust gas temperature below a set range.

[0039] In this embodiment, the TO furnace 2 also includes an ignition device, which is connected to an external fuel pipeline. By forming an initial flame with gaseous fuel, the efficiency of igniting the exhaust gas is accelerated, further improving the efficiency of exhaust gas combustion.

[0040] The exhaust gas after incineration is heat-recovered through the waste heat boiler 3, and the exhaust gas is initially cooled. On the one hand, by recovering the heat of the exhaust gas after incineration, the energy consumption of the dust removal device 1 is reduced, which is energy-saving and environmentally friendly. On the other hand, the exhaust gas after initial cooling also reduces the load on the quench tower 4, which not only reduces the energy consumption of the quench tower 4, but also extends the service life of the quench tower 4.

[0041] After initial cooling, the exhaust gas enters the quench tower 4 for secondary cooling. The cooled exhaust gas then passes through the alkaline scrubbing tower 5 and the demister tower 6 for acid removal and purification before being discharged.

[0042] In this embodiment, the waste heat boiler 3 includes a heat exchanger, which comprises a heat absorption pipe and a heat release pipe that are thermally connected. The outlet of the heat absorption pipe is connected to the dust removal device 1. The exhaust gas after incineration undergoes heat recovery through the waste heat boiler 3, which also provides initial cooling. On the one hand, by recovering the heat from the exhaust gas after incineration, the energy consumption of the dust removal device 1 is reduced, resulting in energy conservation and environmental protection. On the other hand, the initial cooling of the exhaust gas also reduces the load on the quench tower 4, thereby not only reducing the energy consumption of the quench tower 4 but also extending its service life.

[0043] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A tail gas treatment method for lithium battery crushing recycling, applied to a tail gas treatment system for lithium battery crushing recycling, characterized in that: The exhaust gas treatment system includes a dust removal device, a TO furnace, a waste heat boiler, a quench tower, an alkaline scrubbing tower, and a demister, which are connected in sequence; the exhaust gas treatment method includes the following steps: S1: The exhaust gas generated during the crushing and recycling of lithium batteries is introduced into the dust removal device; S2: The dust removal device is equipped with a heating module to heat the exhaust gas to a set temperature, and then filter the dust in the exhaust gas through a metal filter screen. S3: The exhaust gas after dust removal is introduced into the TO furnace, which ignites the exhaust gas by gaseous fuel, and then the exhaust gas itself is used as fuel for incineration. S4: The exhaust gas after incineration is introduced into a waste heat boiler, and the waste heat boiler exchanges heat with the exhaust gas after incineration to recover part of the heat of the exhaust gas after incineration and to initially cool the exhaust gas after incineration. S5: The exhaust gas after initial cooling is introduced into the quench tower, and the exhaust gas after initial cooling is cooled again by the quench tower, so that the exhaust gas is cooled to the set temperature range. S6: The cooled tail gas is passed into the alkaline scrubbing tower to initially remove acidic substances from the tail gas; S7: The exhaust gas, after the initial removal of acidic substances, is passed into the demister for a second removal of acidic substances from the exhaust gas. S8: Exhaust gas after emission treatment.

2. The method for treating exhaust gas from lithium battery crushing and recycling according to claim 1, characterized in that: Step S3 specifically includes the following steps: S3-1: The dust removal device is connected to the TO furnace through an insulated pipe or a heating pipe, so that the exhaust gas after dust removal is introduced into the TO furnace at a high temperature. S3-2: Set the lower limit of the temperature at which the exhaust gas is introduced into the TO furnace to a℃; S3-3: Calculate the transport distance of the exhaust gas from the preset temperature of the dust removal device to a℃ under the heat-insulated pipeline; S3-4: When the distance from the dust removal device to the TO furnace is less than the conveying distance, the dust removal device and the TO furnace are connected by an insulated pipe; when the distance from the dust removal device to the TO furnace is greater than the conveying distance, the dust removal device and the TO furnace are connected by a heating pipe. S3-5: The TO furnace ignites the exhaust gas by gaseous fuel, and then uses the exhaust gas itself as fuel for incineration.

3. The method for treating exhaust gas from lithium battery crushing and recycling according to claim 2, characterized in that: Step S3-5 specifically includes the following steps: S3-5-1: The TO furnace is ignited by gaseous fuel to form an initial flame. The initial flame ignites the exhaust gas introduced into the TO furnace. Then the supply of gaseous fuel is stopped, and the exhaust gas itself is used as fuel to burn the exhaust gas.

4. The method for treating exhaust gas from lithium battery crushing and recycling according to claim 1, characterized in that: Step S4 also includes the following steps: S4-1: The waste heat boiler exchanges heat with the low-temperature gas and the exhaust gas after combustion, so that the low-temperature gas becomes high-temperature gas, and then the high-temperature gas is introduced into the dust removal device.

5. A tail gas treatment system for lithium battery crushing and recycling, located at the end of a lithium battery crushing and recycling device and connected to the exhaust port of the lithium battery crushing and recycling device, characterized in that: The exhaust gas treatment method according to any one of claims 1-4 includes a dust removal device, a TO furnace, a waste heat boiler, a quench tower, an alkaline scrubbing tower and a demister arranged in sequence. The dust removal device includes a first heating module for preheating the exhaust gas, enabling the dust removal device to remove dust at a high temperature; it also includes a metal filter screen, the filter pores of which only allow gas to pass through, for removing dust from the exhaust gas. The exhaust gas after incineration is heat-recovered through a waste heat boiler, which also provides initial cooling. The initially cooled exhaust gas then enters a quench tower for secondary cooling. After cooling, the exhaust gas passes through an alkaline scrubbing tower and a demister tower for acid removal and purification before being discharged.

6. The exhaust gas treatment system for lithium battery crushing and recycling according to claim 5, characterized in that: A connecting pipe is provided between the dust removal device and the TO furnace. The connecting pipe connects the dust removal device and the TO furnace, and an insulation layer or heating layer is provided on the outer periphery of the connecting pipe.

7. The exhaust gas treatment system for lithium battery crushing and recycling according to claim 6, characterized in that: The insulation layer is made of heat-insulating material and is fitted onto the outer wall of the connecting pipe; the inner wall of the insulation layer is provided with a second heating module to form the heating layer. The second heating module includes multiple heating units arranged at intervals or spirally extended heating units, so that the heating area of ​​the second heating module is adapted to the length of the connecting pipe.

8. The exhaust gas treatment system for lithium battery crushing and recycling according to claim 5, characterized in that: Temperature sensors are installed in both the dust removal device and the connecting pipe.

9. The exhaust gas treatment system for lithium battery crushing and recycling according to claim 5, characterized in that: The waste heat boiler includes a heat exchanger, which includes a heat absorption pipe and a heat release pipe that are thermally connected. The outlet of the heat absorption pipe is connected to the dust removal device.

10. The exhaust gas treatment system for lithium battery crushing and recycling according to claim 5, characterized in that: The TO furnace also includes an ignition device, which is connected to an external fuel pipeline.

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