A harmless treatment and heat energy utilization system for pyrolysis oil of waste lithium battery

Abstract

The utility model discloses a kind of waste lithium battery recovery pyrolysis oil innocuous treatment and heat energy utilization system, including sequentially connected pyrolysis furnace, first dust collector, second dust collector, condenser and negative pressure mechanism, the import of the pyrolysis furnace is used to receive waste lithium battery, the bottom outlet of the condenser is connected with liquid storage tank, the liquid storage tank is connected with the two combustion chamber of tail gas treatment subsystem by pumping subsystem, the negative pressure mechanism is used to deliver the tail gas of condenser to the two combustion chamber of tail gas treatment subsystem. Compared with prior art, the utility model realizes waste lithium battery on-line continuous innocuous treatment, process is less, efficiency is high, reduces energy consumption cost, dust treatment before condensation can collect valuable dust, also effectively guarantee pyrolysis oil condensation effect, avoids pipeline blockage, guarantees that system can long-term operation.

Description

Technical Field

[0001] This utility model relates to the field of waste lithium battery treatment technology, and in particular to a system for harmless treatment of waste lithium battery pyrolysis oil and heat energy utilization. Background Technology

[0002] Currently, publicly disclosed methods for recovering electrolyte from spent lithium batteries mainly include: organic solvent leaching, supercritical CO2 extraction, puncture and drainage, vacuum extraction, and heating evaporation. Among these, only heating evaporation is easily feasible for continuous production. For example, patent CN109539267A discloses a pyrolysis recycling system and its processing method for spent lithium batteries. Spent lithium batteries enter the furnace tube through a feeding and distributing mechanism, burn in the combustion chamber to generate pyrolysis gas, and then the pyrolysis gas is separated into small-molecule pyrolysis gas and large-molecule pyrolysis oil by an oil-gas separation mechanism, which are then sent to the combustion chamber and secondary combustion chamber respectively. However, during the transportation process, black powder entrained in the pyrolysis waste gas settles and easily clogs the pipes, requiring periodic collection. Utility Model Content

[0003] This utility model provides a system for the harmless treatment and thermal energy utilization of recycled pyrolysis oil from waste lithium batteries, which solves the problem of easy blockage in the pipes of existing equipment.

[0004] This utility model provides a system for the harmless treatment and thermal energy utilization of waste lithium battery pyrolysis oil, including a pyrolysis furnace, a first dust collector, a second dust collector, a condenser, and a negative pressure mechanism connected in sequence. The inlet of the pyrolysis furnace is used to receive waste lithium batteries. The bottom outlet of the condenser is connected to a storage tank. The storage tank is connected to the secondary combustion chamber of the exhaust gas treatment subsystem through a pumping subsystem. The negative pressure mechanism is used to transport the exhaust gas from the condenser to the secondary combustion chamber of the exhaust gas treatment subsystem.

[0005] Preferably, it also includes a crushing mechanism and a conveying mechanism, wherein the crushing mechanism is connected to the feed inlet of the pyrolysis furnace through the conveying mechanism.

[0006] Preferably, there are two condensers connected in series and connected to the liquid storage tank respectively. One condenser is connected to the outlet of the second dust collector, and the other condenser is connected to the negative pressure mechanism.

[0007] Preferably, the condenser includes an air inlet chamber, a cooling chamber, and an air outlet chamber. The cooling chamber is provided with multiple cooling air ducts, and the two ends of the cooling air ducts are respectively connected to the air inlet chamber and the air outlet chamber. The bottom of the air outlet chamber is provided with an outlet that connects to a liquid storage tank.

[0008] Preferably, the pumping subsystem includes a pumping pipe disposed between the liquid storage tank and the secondary combustion chamber, and a liquid transfer pump, a one-way valve, a flow regulating valve, a flame arrester and a nozzle are sequentially disposed on the pumping pipe along the pumping direction.

[0009] Preferably, the pyrolysis oil in the storage tank includes: electrolyte vapor condensate, electrolyte pyrolysis gas condensate, diaphragm pyrolysis gas condensate, and binder pyrolysis gas condensate.

[0010] Preferably, the exhaust gas treatment subsystem further includes a heat exchanger, a quench tower, a dry reactor, a bag filter, an alkaline spray tower, and an induced draft fan arranged in sequence, and the secondary combustion chamber is connected to the heat exchanger.

[0011] Preferably, the secondary combustion chamber is provided with an oxygen supply pipe, which passes through the heat exchanger.

[0012] Preferably, the operating temperature of the pyrolysis furnace is 400-550℃, and the operating temperature of the secondary combustion chamber is 850-1100℃.

[0013] Preferably, two alkaline spray towers are distributed between the bag filter and the induced draft fan.

[0014] Compared with existing technologies, in this invention, after the waste lithium batteries are pyrolyzed in a pyrolysis furnace, the generated vapor undergoes two-stage dust removal, and then is condensed in a condenser to obtain pyrolysis oil, which is stored in a storage tank. The remaining tail gas is transported to the secondary combustion chamber of the tail gas treatment subsystem via a negative pressure mechanism for harmless treatment. The pyrolysis oil in the storage tank is then pumped to the secondary combustion chamber for combustion, significantly reducing the natural gas consumption in the secondary combustion chamber and saving energy. This invention achieves online continuous harmless treatment of waste lithium batteries, with fewer processing steps, higher efficiency, and reduced energy costs. The dust treatment before condensation collects valuable dust and effectively ensures the condensation effect of the pyrolysis oil, avoiding pipeline blockage and ensuring long-term system operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the exhaust gas treatment subsystem of this utility model;

[0018] Figure 3 This is a schematic diagram of the pumping subsystem of this utility model;

[0019] Figure 4This is a schematic diagram of the condenser of this utility model.

[0020] Figure label:

[0021] 1. Crushing mechanism, 2. Conveying mechanism, 3. Pyrolysis furnace, 4. First dust collector, 5. Second dust collector, 6. Condenser, 7. Negative pressure mechanism, 100. Liquid storage tank, 8. Pumping subsystem, 9. Tail gas treatment subsystem, 61. Air inlet chamber, 62. Cooling chamber, 63. Air outlet chamber, 64. Cooling duct, 81. Pumping pipe, 82. Liquid transfer pump, 83. Check valve, 84. Flow regulating valve, 85. Flame arrester, 86. Nozzle, 91. Secondary combustion chamber, 92. Heat exchanger, 93. Quenching tower, 94. Dry reactor, 95. Bag filter, 96. Alkali spray tower, 97. Exhaust fan, 98. Chimney. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] See attached document Figure 1This invention provides a system for the harmless treatment and thermal energy utilization of pyrolysis oil from recycled waste lithium batteries. The system includes a pyrolysis furnace 3, a first dust collector 4, a second dust collector 5, a condenser 6, and a negative pressure mechanism 7 connected in sequence. The inlet of the pyrolysis furnace 3 receives waste lithium batteries. The bottom outlet of the condenser 6 is connected to a storage tank 100. The storage tank 100 is connected to the secondary combustion chamber 91 of the exhaust gas treatment subsystem 9 via a pumping subsystem 8. The negative pressure mechanism 7 transports the exhaust gas from the condenser 6 to the secondary combustion chamber 91 of the exhaust gas treatment subsystem 9. The secondary combustion chamber 91 is equipped with a natural gas burner, which can actively ignite and combust the combustible components in the exhaust gas. The negative pressure mechanism 7 generates negative pressure in the pipeline between the pyrolysis furnace 3 and the condenser 6. In this invention, the waste lithium batteries are dried and pyrolyzed in the pyrolysis furnace 3. The volatilized vapors are drawn to the first dust collector 4 through negative pressure, where a large amount of coarse dust particles in the vapor are collected. The steam is then drawn under negative pressure to the second dust collector 5, where most of the dust is collected. Next, the steam is drawn to the condenser 6, where the pyrolysis oil vapor condenses into liquid pyrolysis oil, which flows through a bottom pipe to the storage tank 100. The remaining exhaust gases enter the secondary combustion chamber 91 of the exhaust gas treatment subsystem 9 via the negative pressure mechanism 7 for combustion. The liquid in the storage tank 100 is pumped to the secondary combustion chamber 91 of the exhaust gas treatment subsystem 9 via the pumping subsystem 8 for combustion. This utility model has a simpler waste lithium battery processing flow. After dust removal, the pyrolysis oil vapor is directly condensed by the condenser 6, and then the condensed pyrolysis oil is used as fuel and pumped into the secondary combustion chamber 91 via the pumping subsystem 8 for combustion. This setup significantly reduces natural gas consumption, achieving energy saving and consumption reduction. Furthermore, the remaining exhaust gases in the steam are sent to the exhaust gas treatment subsystem 9 for harmless treatment. Through this structural design, the harmless and continuous treatment of pyrolysis oil from waste lithium batteries is achieved at a relatively low cost. This utility model uses a two-stage dust removal device to remove dust from flue gas. If dust is not removed before collecting pyrolysis oil, a large amount of dust will be mixed in the pyrolysis oil. This will result in three problems: first, the condensation effect of the pyrolysis oil will be reduced; second, valuable dust will be lost; and third, the pipeline will be blocked later.

[0024] In another embodiment of this invention, the present invention further includes a crushing mechanism 1 and a conveying mechanism 2. The crushing mechanism 1 is connected to the feed inlet of the pyrolysis furnace 3 via the conveying mechanism 2. Waste lithium batteries are fed into the crushing mechanism 1 from the top inlet, and after crushing, the crushed material is transported to the pyrolysis furnace 3 via the conveying mechanism 2. This invention employs a method of crushing the battery before pyrolysis, allowing the pyrolysis oil to flow out from inside the battery, thus enabling better and faster volatilization of all the pyrolysis oil.

[0025] In another embodiment of this utility model: there are two condensers 6 connected in series and respectively connected to the storage tank 100. One condenser 6 is connected to the outlet of the second dust collector 5, and the other condenser 6 is connected to the negative pressure mechanism 7. When the steam passes through the first condenser 6, most of the pyrolysis oil vapor condenses here, becoming liquid pyrolysis oil, which flows to the storage tank 100 through the bottom pipe. Then the steam enters the second condenser 6, where all the remaining pyrolysis oil vapor condenses here, becoming liquid pyrolysis oil, which flows to the storage tank 100 through the bottom pipe. Thus, all the pyrolysis oil vapor in the exhaust gas is condensed and collected. The two-stage condenser 6 cooling design for pyrolysis oil provides double protection, ensuring that as much pyrolysis oil as possible is condensed.

[0026] One embodiment of condenser 6: Refer to the appendix Figure 4 The condenser 6 includes an air inlet chamber 61, a cooling chamber 62, and an air outlet chamber 63. Multiple cooling ducts 64 are installed within the cooling chamber 62, with both ends of each duct connected to the air inlet chamber 61 and the air outlet chamber 63, respectively. The air inlet chamber 61 is located above the air outlet chamber and has an exhaust gas inlet. The air outlet chamber 63 has an exhaust gas outlet, and the bottom of the air outlet chamber 63 has an outlet connected to the liquid storage tank 100. A water outlet pipe and a water inlet pipe are connected to the upper and lower ends of the cooling chamber 62, respectively. Through this structural design, the exhaust gas in the air inlet chamber 61 can only reach the air outlet chamber 63 along the cooling ducts 64. The cooling ducts 64 are evenly distributed across the cooling chamber 62, and the cooling water in the cooling chamber 62 cools the exhaust gas in each cooling duct 64. This structural design evenly separates large clumps of exhaust gas for cooling, ensuring rapid condensation of the pyrolysis oil vapor in the exhaust gas with good condensation effect.

[0027] One implementation of the pumping subsystem 8: Refer to Appendix Figure 3 The pumping subsystem 8 includes a pumping pipe 81 located between the storage tank 100 and the secondary combustion chamber 91. Along the pumping direction, the pumping pipe 81 is sequentially equipped with a liquid transfer pump 82, a one-way valve 83, a flow regulating valve 84, a flame arrester 85, and a nozzle 86. The pyrolysis oil in the storage tank 100 is pumped by the liquid transfer pump 82, passes through the one-way valve 83, has its flow rate regulated by the flow regulating valve 84, then passes through the flame arrester 85 to prevent backfire, and finally is sprayed into the secondary combustion chamber 91 through the nozzle 86, where it undergoes high-temperature combustion.

[0028] Specifically, the liquid transfer pump is either a Roots pump or a gear pump.

[0029] In another embodiment of this utility model, the pyrolysis oil in the storage tank 100 comprises: electrolyte vapor condensate, electrolyte pyrolysis gas condensate, diaphragm pyrolysis gas condensate, and binder pyrolysis gas condensate. The pyrolysis oil obtained through condensation has combustible components and a high calorific value, as analyzed below:

[0030] 1. Evaporation condensate and pyrolysis condensate from waste lithium battery electrolyte:

[0031] Electrolyte vapor condensate composition: electrolyte carbonate organic solvents (such as ethylene carbonate EC, dimethyl carbonate DMC, diethyl carbonate DEC, etc.), low-boiling-point solvents (such as DMC, boiling point 90℃) evaporate preferentially, and the proportion of high-boiling-point solvents (such as EC, boiling point 248℃) in the condensate increases; electrolyte pyrolysis gas condensate composition: methanol, ethanol, acetic acid, benzene series compounds, etc.

[0032] The electrolyte content in waste lithium batteries is generally 10%-20%, and the electrolyte content varies depending on the lithium battery model.

[0033] The recovery rate of evaporation / pyrolysis condensate from waste lithium battery electrolyte is approximately 30%-60%.

[0034] The calorific value of the electrolyte recovered from the evaporation / pyrolysis condensation of waste lithium batteries is typically 15-23 MJ / kg.

[0035] 2. Condensate from the pyrolysis of PVDF binder in waste lithium batteries:

[0036] The main products of PVDF pyrolysis gas condensate are: fluorinated hydrocarbons (such as fluorinated alkenes and fluorinated aromatics), a small amount of HF, and alkanes / olefins (C5-C20) generated by carbon chain cleavage.

[0037] PVDF accounts for approximately 1%-5% of waste lithium batteries.

[0038] The recovery rate of PVDF pyrolysis gas condensate from waste lithium battery binders is approximately 50%-70%.

[0039] The calorific value of PVDF pyrolysis gas condensate from waste lithium battery binders is typically 12-25 MJ / kg.

[0040] 3. Condensate from the pyrolysis of spent lithium battery separators:

[0041] The main products of the condensate generated from the pyrolysis of waste lithium battery separators are alkanes, alkenes, aromatic hydrocarbons, etc.

[0042] The separator typically accounts for 3%-10% of the contents of used lithium batteries.

[0043] The recovery rate of pyrolysis oil condensed from waste lithium battery separator pyrolysis gas is approximately 70%-85%.

[0044] The calorific value of pyrolysis oil from waste lithium battery separators is typically 30-42 MJ / kg.

[0045] Based on the analysis of the composition and calorific value of pyrolysis oil, the calorific value of pyrolysis oil from recycled waste lithium batteries is calculated:

[0046] Formula for calculating the heat released by combustion:

[0047] Q = HV * m

[0048] in:

[0049] Q represents the heat released during combustion (MJ).

[0050] HV stands for calorific value (MJ / kg).

[0051] m represents the fuel mass (kg).

[0052] Formula for calculating the total heat released by combustion:

[0053] Q total =HV1*m1+HV2*m2+HV3*m3

[0054] Q total The heat released from the combustion of waste lithium battery electrolyte vapor condensate and pyrolysis gas condensate + the heat released from the combustion of waste lithium battery binder PVDF pyrolysis gas condensate + the heat released from the combustion of waste lithium battery separator pyrolysis gas condensate.

[0055] Formula for calculating natural gas volume equivalent:

[0056] Natural gas equivalent (m 3 = Energy of other fuels (MJ) / Calorific value of natural gas (MJ / m³) 3 )

[0057] According to relevant standards, the calorific value of natural gas is calculated to be 31.4 MJ / m³. 3 .

[0058] Formula for converting heat to power:

[0059] 1 kWh = 3.6 MJ

[0060] Based on the above analysis data and calculation formulas, the calculation results for the calorific value of waste lithium battery pyrolysis oil and its natural gas equivalent and power equivalent are shown in Table 1:

[0061] Table 1. Calculation of pyrolysis oil combustion calorific value, natural gas equivalent, and power equivalent.

[0062]

[0063] As shown in Table 1, the total calorific value of the pyrolysis oil recovered from each ton of waste lithium batteries ranges from a minimum of 1140 MJ to a maximum of 7205 MJ; the corresponding minimum equivalent natural gas volume is 36.31 m³. 3 The maximum value is 229.46m. 3 The average value is 132.89m.3 The minimum kilowatt-hour of total combustion heat is 316.67 kWh, the maximum is 2001.39 kWh, and the average is 1159.03 kWh.

[0064] Currently, in a waste lithium battery recycling production line with a capacity of 1 t / h, the secondary combustion chamber 91 of its exhaust gas treatment subsystem 9 uses direct combustion. At a process temperature of 850-1100℃, the natural gas consumption is approximately 50-150 Nm³. 3 / h, with an average value of 100Nm 3 / h.

[0065] The waste lithium battery pyrolysis oil harmless treatment and heat energy utilization system provided by this utility model, when processing one ton of waste lithium batteries, yields an average natural gas equivalent of 132.89 m³ of total combustion heat of the pyrolysis oil. 3 Greater than the consumption of natural gas 100m³ 3 This can greatly reduce natural gas consumption, or even eliminate the need for natural gas altogether.

[0066] As another embodiment of this utility model: refer to the appendix Figure 2 The exhaust gas treatment subsystem 9 also includes a heat exchanger 92, a quench tower 93, a dry reactor 94, a bag filter 95, an alkaline spray tower 96, and an induced draft fan 97 arranged sequentially. The secondary combustion chamber 91 is connected to the heat exchanger 92. The outlet of the heat exchanger 92 is connected to the quench tower 93. Through the principle of water mist vaporization heat absorption, the exhaust gas after combustion in the secondary combustion chamber 91 is rapidly cooled from above 500°C to below 200°C within 1 second, preventing the resynthesis of dioxins. The outlet of the quench tower 93 is connected to the dry reactor 94. The dry reactor 94 injects activated carbon and quicklime into the exhaust gas delivery pipeline through a venturi tube. The activated carbon adsorbs VOCs in the exhaust gas, and the quicklime reacts with acidic gases (such as HF, H3PO4, etc.) in the exhaust gas to generate harmless CaF2 and Ca3(PO4)2. The outlet of the dry reactor 94 is connected to the bag filter 95, which filters and collects particulate matter (such as unreacted activated carbon and quicklime, CaF2 and Ca3(PO4)2 generated in the reaction, and dust particles from the combustion of black powder) in the exhaust gas, reducing the concentration of particulate matter in the exhaust gas to within environmental protection requirements. The alkaline spray tower 96 absorbs and neutralizes the acidic gases (such as HF, H3PO4, etc.) that are not completely absorbed in the exhaust gas, and also has a secondary dust reduction effect. The outlet of the alkaline spray tower 96 is connected to the induced draft fan 97, which creates negative pressure, drives the exhaust gas through the exhaust gas treatment subsystem 9, and discharges the exhaust gas into the atmosphere.

[0067] In another embodiment of this utility model, the secondary combustion chamber 91 is provided with an oxygen supply pipe that passes through the heat exchanger 92. The outlet of the secondary combustion chamber 91 is connected to the heat exchanger 92. The heat exchanger 92 preheats the oxygen supply air required for combustion in the secondary combustion chamber 91 through the gas heat exchange structure inside the heat exchanger 92. The preheated oxygen supply air is then transported to the secondary combustion chamber 91 through the oxygen supply pipe to assist combustion, thereby achieving the effect of energy saving and consumption reduction.

[0068] As another embodiment of this utility model: the working temperature of the pyrolysis furnace 3 is 400-550℃, the working temperature of the secondary combustion chamber 91 is 850-1100℃, and the residence time of the gas is ≥2 seconds, which can completely decompose the dioxins in the waste gas.

[0069] In another embodiment of this utility model: two alkaline spray towers 96 are distributed between the bag filter 95 and the induced draft fan 97. The outlet of the bag filter 95 is connected to the first alkaline spray tower 96, which absorbs and neutralizes the incompletely absorbed acidic gases (such as HF, H3PO4, etc.) in the exhaust gas, and also achieves a secondary dust reduction effect. The outlet of the first alkaline spray tower 96 is connected to the second alkaline spray tower 96, which absorbs and neutralizes the incompletely absorbed acidic gases (such as HF, H3PO4, etc.) in the exhaust gas again, and reduces dust again, so that the exhaust gas can meet the emission standards. The outlet of the second alkaline spray tower 96 is connected to the induced draft fan 97, which creates negative pressure, drives the exhaust gas through the exhaust gas treatment subsystem 9, and discharges the exhaust gas into the atmosphere.

[0070] In another embodiment of this utility model, the outlet of the induced draft fan 97 is connected to the chimney 98. The induced draft fan 97 delivers the exhaust gas to the chimney 98, from which it is discharged into the atmosphere.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A system for the harmless treatment and thermal energy utilization of pyrolysis oil from recycled waste lithium batteries, characterized in that, The system includes a pyrolysis furnace, a first dust collector, a second dust collector, a condenser, and a negative pressure mechanism connected in sequence. The inlet of the pyrolysis furnace is used to receive waste lithium batteries. The bottom outlet of the condenser is connected to a liquid storage tank. The liquid storage tank is connected to the secondary combustion chamber of the exhaust gas treatment subsystem through a pumping subsystem. The negative pressure mechanism is used to transport the exhaust gas from the condenser to the secondary combustion chamber of the exhaust gas treatment subsystem.

2. The waste lithium battery pyrolysis oil harmless treatment and heat energy utilization system according to claim 1, characterized in that, It also includes a crushing mechanism and a conveying mechanism, wherein the crushing mechanism is connected to the feed inlet of the pyrolysis furnace through the conveying mechanism.

3. The waste lithium battery pyrolysis oil harmless treatment and heat energy utilization system according to claim 2, characterized in that, There are two condensers connected in series and each connected to a liquid storage tank. One condenser is connected to the outlet of the second dust collector, and the other condenser is connected to the negative pressure mechanism.

4. The waste lithium battery pyrolysis oil harmless treatment and heat energy utilization system according to claim 3, characterized in that, The condenser includes an air inlet chamber, a cooling chamber, and an air outlet chamber. The cooling chamber is provided with multiple cooling air ducts, and the two ends of the cooling air ducts are respectively connected to the air inlet chamber and the air outlet chamber. The bottom of the air outlet chamber is provided with an outlet that connects to a liquid storage tank.

5. The waste lithium battery pyrolysis oil harmless treatment and heat energy utilization system according to claim 4, characterized in that, The pumping subsystem includes a pumping pipe disposed between the liquid storage tank and the secondary combustion chamber. A liquid transfer pump, a one-way valve, a flow regulating valve, a flame arrester, and a nozzle are sequentially disposed on the pumping pipe along the pumping direction.

6. The waste lithium battery pyrolysis oil harmless treatment and heat energy utilization system according to claim 5, characterized in that, The pyrolysis oil in the storage tank includes: electrolyte vapor condensate, electrolyte pyrolysis gas condensate, diaphragm pyrolysis gas condensate, and binder pyrolysis gas condensate.

7. The waste lithium battery pyrolysis oil harmless treatment and heat energy utilization system according to claim 6, characterized in that, The exhaust gas treatment subsystem also includes a heat exchanger, a quench tower, a dry reactor, a bag filter, an alkaline spray tower, and an induced draft fan arranged in sequence, and the secondary combustion chamber is connected to the heat exchanger.

8. The waste lithium battery pyrolysis oil harmless treatment and heat energy utilization system according to claim 7, characterized in that, The secondary combustion chamber is equipped with an oxygen supply pipe, which passes through the heat exchanger.

9. The waste lithium battery pyrolysis oil harmless treatment and heat energy utilization system according to claim 8, characterized in that, The operating temperature of the pyrolysis furnace is 400-550℃, and the operating temperature of the secondary combustion chamber is 850-1100℃.

10. The system for harmless treatment and thermal energy utilization of waste lithium battery pyrolysis oil according to claim 9, characterized in that, Two alkaline spray towers are distributed between the bag filter and the induced draft fan.

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