Lithium battery disassembly waste gas recovery treatment system

Abstract

The utility model discloses a lithium battery disassembly waste gas recovery treatment system, which comprises a header pipe for introducing waste gas, and is characterized in that one side of the header pipe is communicated with a flame arrester, one side of the flame arrester is communicated with a front surface air cooler, one side of the front surface air cooler is communicated with a three-stage double-channel condensation module, and the other side of the front surface air cooler is communicated with a three-stage double-channel condensation module. One side of the three-stage double-channel condensation module is communicated with a first heat exchanger, one side of the first heat exchanger is communicated with multiple stages of alkaline washing towers, the alkaline washing towers are communicated with one another, and one side of the last alkaline washing tower is communicated with a dry filter; an activated carbon adsorption and desorption and disposable adsorption combined module is arranged on one side of the dry type filter in a communicating mode, lithium battery disassembly organic components are recycled through a condensation method, secondary pollutants such as dioxin and acidic materials can be avoided, meanwhile, graded condensation is conducted according to the physical and chemical properties of lithium battery disassembly waste gas, and secondary pollution is avoided. Different pollutants are condensed and recovered at different temperatures, so that the energy consumption is reduced while the recovery effect is ensured, and the solvent can be recycled.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium electricity dismantling waste gas recovery technical field, specifically is a kind of lithium electricity dismantling waste gas recovery treatment system. BACKGROUND

[0002] With global environment is bad, oil crisis and the like reasons, new energy vehicles are rapidly developed, and the service life of power battery on new energy vehicles is shorter, and a large amount of waste lithium battery is generated. Waste gas generated in the process of lithium battery disassembly contains most of VOCs, which are all toxic and harmful substances. If not properly treated, it will pollute the soil and water sources and affect the ecological environment. The existing lithium battery disassembly waste gas treatment method has many problems, such as the combustion process is easy to produce dioxin, acidic substances and other secondary pollutants, and the secondary pollutants will pollute the environment again, and there is a risk of combustion explosion in the operation process. When recovering substances of different temperatures at the same time, the recovery of low-melting-point substances will freeze and block the heat exchanger, and there are related problems such as poor heat exchange efficiency. Therefore, it is very urgent to avoid waste of resources in the combustion treatment of lithium battery disassembly waste gas, and to carry out fractional condensation according to the melting point and physicochemical properties of lithium battery disassembly waste gas components to realize the condensation and recovery of different pollutants at different temperatures. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a lithium battery disassembly waste gas recovery treatment system, which can solve the problems in the prior art.

[0004] The utility model is realized through the following technical schemes: the utility model discloses a lithium battery disassembly waste gas recovery treatment system, which comprises a main pipe, and the main pipe is connected with battery disassembly waste gas. The utility model is characterized in that a flame arrester is further connected with the main pipe, a front surface condenser is further connected with one side of the flame arrester, a three-stage double-channel condensing module capable of carrying out multi-stage cooling on waste gas is further connected with one side of the front surface condenser, a first heat exchanger is further connected with one side of the three-stage double-channel condensing module, multi-stage caustic washing towers are further connected with one side of the first heat exchanger, the caustic washing towers are connected with each other, a dry filter is further connected with one side of the last caustic washing tower, an activated carbon adsorption and desorption combined module for desorption of waste gas is further connected with one side of the dry filter, and a solvent recovery channel is further connected with the bottom of the three-stage double-channel condensing module.

[0005] Further technical scheme, the front surface condenser one side is provided with second heat exchanger, the second heat exchanger one side is provided with electric heat tracing storage tank, the electric heat tracing storage tank is connected with the front surface condenser, and the coolant circulates in the front surface condenser, the second heat exchanger and the electric heat tracing storage tank to bring heat from the front surface condenser to the second heat exchanger.

[0006] Further, the second heat exchanger is further connected with a water tower, and the coolant flows between the second heat exchanger and the water tower to take the heat of the second heat exchanger to the water tower.

[0007] Further, the temperature of the exhaust gas before passing through the main pipe is 113 DEG C, the temperature of the exhaust gas after passing through the front surface cooler is 40 DEG C, and the temperatures of the three-stage double-channel condensing modules are 5 DEG C, -25 DEG C and -60 DEG C respectively.

[0008] Further, the three-stage double-channel condensing module comprises two groups of common cooling heat exchangers, middle cooling heat exchangers and deep cooling heat exchangers, one side of the common cooling heat exchangers, the middle cooling heat exchangers and the deep cooling heat exchangers is connected with a refrigeration station, the deep cooling heat exchanger is connected with the first heat exchanger, the common cooling heat exchanger, the middle cooling heat exchanger and the deep cooling heat exchanger are connected with the solvent delivery channel, and the exhaust gas is divided into two channels after passing through the front surface cooler and sequentially enters the common cooling heat exchanger, the middle cooling heat exchanger and the deep cooling heat exchanger for cooling.

[0009] Further, the refrigeration station comprises a third heat exchanger, one side of the third heat exchanger is provided with a refrigeration unit, the refrigeration unit is in heat exchange with the third heat exchanger, one side of the refrigeration unit is further provided with a deep cooling storage tank, the deep cooling storage tank is connected with the common cooling heat exchanger, the middle cooling heat exchanger and the deep cooling heat exchanger and the refrigeration unit, the deep cooling storage tank and the refrigeration unit are provided with a coolant, the coolant circulates in the refrigeration unit, the common cooling heat exchanger, the middle cooling heat exchanger, the deep cooling heat exchanger and the deep cooling storage tank, one side of the third heat exchanger is further provided with a defrosting storage tank, one side of the third heat exchanger is further connected with a fourth heat exchanger, and the coolant circulates in the defrosting storage tank, the common cooling heat exchanger, the middle cooling heat exchanger, the deep cooling heat exchanger and the fourth heat exchanger.

[0010] Further, the refrigerant exchanges heat with the refrigeration unit after heat exchange, and then enters the common cooling heat exchanger, the middle cooling heat exchanger and the deep cooling heat exchanger for heat exchange, and then returns to the refrigeration unit for heat exchange after entering the deep cooling storage tank and the fourth pump.

[0011] Further, the refrigerant can also enter the defrosting storage tank for storage when returning from the common cooling heat exchanger, the middle cooling heat exchanger and the deep cooling heat exchanger, then exchanges heat through the third heat exchanger, and then exchanges heat through the fourth heat exchanger, and then returns to the common cooling heat exchanger, the middle cooling heat exchanger and the deep cooling heat exchanger.

[0012] Further, for the refrigeration station between the deep cooling heat exchangers, the defrosting storage tank is further connected with the first heat exchanger, the fourth heat exchanger is further connected with the first heat exchanger, and the coolant enters the first heat exchanger after passing through the third heat exchanger and the fourth heat exchanger.

[0013] A further technical solution is to allow steam or hot water to be introduced into one side of the fourth heat exchanger for heating, thus playing an auxiliary heating role.

[0014] A further technical solution includes an activated carbon adsorption-desorption and disposable adsorption combination module comprising two activated carbon tanks, which are connected to the dry filter. An activated carbon box is connected to one side of each activated carbon tank, and a fan is connected to one side of the activated carbon box. The fan is connected to the external space, and an adsorption-desorption component is also provided on one side of each activated carbon tank.

[0015] A further technical solution includes an adsorption-desorption assembly comprising a condenser and a saturated steam channel. The saturated steam channel is connected to the condenser after being connected to the activated carbon tank. It also includes a surface cooler, a circulating fan, and a steam heater. The surface cooler, the circulating fan, and the steam heater are connected to each other. The surface cooler and the steam heater are connected to the activated carbon tank. One side of the steam heater is also connected to the saturated steam channel.

[0016] The beneficial effects of this utility model are as follows: First, the use of a three-stage dual-channel condensation module to recover organic components from lithium battery dismantling by condensation method can avoid the generation of secondary pollutants, such as dioxins and acidic substances, and eliminate the risk of combustion and explosion. At the same time, considering the different melting points and physicochemical properties of the components of lithium battery dismantling exhaust gas, staged condensation is carried out, and different pollutants are recovered by condensation at different temperatures, ensuring the condensation recovery effect while recycling the solvent.

[0017] Second, the use of dual-channel mechanical compression condensation can effectively avoid unstable intake conditions. It cleverly utilizes the waste heat of the compressor in the refrigeration unit for defrosting, using the heat medium as an intermediate carrier to ensure timely defrosting while saving energy.

[0018] Third, based on the characteristics of lithium battery dismantling waste gas, a combined recovery process of condensation and high-efficiency solid adsorbents (such as macroporous resins, carbon fibers, etc.) is selected to ensure that the waste gas emissions meet the standards and maintain stability.

[0019] Fourth, by using one activated carbon tank for adsorption and another for desorption, alternating operation is achieved to continuously adsorb the waste gas, resulting in good performance. Attached Figure Description

[0020] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of a lithium battery dismantling waste gas recovery and treatment system according to the present invention;

[0022] Figure 2 for Figure 1 A simplified structural diagram of the system;

[0023] Figure 3 for Figure 2 A schematic diagram of the activated carbon adsorption-desorption and single-use adsorption combined module;

[0024] Figure 4 for Figure 2 Schematic diagram of a medium-deep cryogenic refrigeration station;

[0025] Figure 5 for Figure 2 Schematic diagram of the structure of the Zhongzhongleng refrigeration station;

[0026] Figure 6 for Figure 2 Schematic diagram of the structure of Zhongpu Refrigeration Station;

[0027] The components include: flame arrester 11, front surface cooler 12, refrigeration station 13, cold heat exchanger 14, intermediate cold heat exchanger 15, cryogenic heat exchanger 16, activated carbon adsorption-desorption and one-time adsorption combination module 17, dry filter 18, alkaline washing tower 19, first heat exchanger 21, electric heat tracing storage tank 22, water tower 23, second heat exchanger 24, main pipe 25, solvent delivery channel 26, steam heater 31, circulating fan 32, surface cooler 33, activated carbon tank 34, condenser 35, activated carbon box 36, saturated steam channel 37, defrosting storage tank 41, fourth heat exchanger 42, refrigeration unit 43, cryogenic storage tank 44, and third heat exchanger 45. Detailed Implementation

[0028] like Figures 1-6 As shown, this utility model will be described in detail. For ease of description, the directions mentioned below are defined as follows: the directions of up, down, left, right, front, and back mentioned below are the same as... Figure 1 The projection relationships are consistent in all directions (up, down, left, right, front, back). This utility model discloses a lithium battery dismantling waste gas recovery and treatment system, including a main pipe 25, through which waste gas is introduced. A flame arrester 11 is connected to one side of the main pipe 25. A front surface cooler 12 is connected to one side of the flame arrester 11. A three-stage dual-channel condensing module capable of multi-stage cooling of the waste gas is connected to one side of the front surface cooler 12. A first heat exchanger 21 is connected to one side of the three-stage dual-channel condensing module. A multi-stage alkaline scrubbing tower 19 is connected to one side of the first heat exchanger 21. The alkaline scrubbing towers 19 are interconnected. A dry filter 18 is connected to one side of the last alkaline scrubbing tower 19. An activated carbon adsorption-desorption and one-time adsorption combination module 17 for de-adsorption of the waste gas is connected to one side of the dry filter 18. A solvent delivery channel 26 is also connected to one side of the three-stage dual-channel condensing module to recover the solvent.

[0029] Beneficially, the total pipe 25 is in communication with the inlet of the flame arrester 11, the outlet of the flame arrester 11 is in communication with the exhaust gas inlet of the front surface cooler 12, the exhaust gas outlet of the front surface cooler 12 is in communication with the inlet of the three-stage double-channel condensing module, the exhaust gas outlet of the three-stage double-channel condensing module is in communication with the exhaust gas inlet of the first heat exchanger 21, the exhaust gas outlet of the first heat exchanger 21 is in communication with the inlet of the caustic washing tower 19, the outlet of the caustic washing tower 19 is in communication with the inlet of another caustic washing tower 19, the outlet of the last caustic washing tower 19 is in communication with the dry filter 18, and the outlet of the dry filter 18 is in communication with the inlet of the activated carbon adsorption and desorption and disposable adsorption combined module 17.

[0030] Beneficially, the total pipe 25 is in communication with the inlet of the flame arrester 11, the outlet of the flame arrester 11 is in communication with the exhaust gas inlet of the front surface cooler 12, the exhaust gas outlet of the front surface cooler 12 is in communication with the inlet of the three-stage double-channel condensing module, the exhaust gas outlet of the three-stage double-channel condensing module is in communication with the exhaust gas inlet of the first heat exchanger 21, the exhaust gas outlet of the first heat exchanger 21 is in communication with the inlet of the caustic washing tower 19, the outlet of the caustic washing tower 19 is in communication with the inlet of another caustic washing tower 19, the outlet of the last caustic washing tower 19 is in communication with the dry filter 18, and the outlet of the dry filter 18 is in communication with the inlet of the activated carbon adsorption and desorption and disposable adsorption combined module 17.

[0031] Beneficially, the total pipe 25 is in communication with the inlet of the flame arrester 11, the outlet of the flame arrester 11 is in communication with the exhaust gas inlet of the front surface cooler 12, the exhaust gas outlet of the front surface cooler 12 is in communication with the inlet of the three-stage double-channel condensing module, the exhaust gas outlet of the three-stage double-channel condensing module is in communication with the exhaust gas inlet of the first heat exchanger 21, the exhaust gas outlet of the first heat exchanger 21 is in communication with the inlet of the caustic washing tower 19, the outlet of the caustic washing tower 19 is in communication with the inlet of another caustic washing tower 19, the outlet of the last caustic washing tower 19 is in communication with the dry filter 18, and the outlet of the dry filter 18 is in communication with the inlet of the activated carbon adsorption and desorption and disposable adsorption combined module 17.

[0032] Beneficially, the total pipe 25 is in communication with the inlet of the flame arrester 11, the outlet of the flame arrester 11 is in communication with the exhaust gas inlet of the front surface cooler 12, the exhaust gas outlet of the front surface cooler 12 is in communication with the inlet of the three-stage double-channel condensing module, the exhaust gas outlet of the three-stage double-channel condensing module is in communication with the exhaust gas inlet of the first heat exchanger 21, the exhaust gas outlet of the first heat exchanger 21 is in communication with the inlet of the caustic washing tower 19, the outlet of the caustic washing tower 19 is in communication with the inlet of another caustic washing tower 19, the outlet of the last caustic washing tower 19 is in communication with the dry filter 18, and the outlet of the dry filter 18 is in communication with the inlet of the activated carbon adsorption and desorption and disposable adsorption combined module 17.

[0033] Beneficially, the total pipe 25 is in communication with the inlet of the flame arrester 11, the outlet of the flame arrester 11 is in communication with the exhaust gas inlet of the front surface cooler 12, the exhaust gas outlet of the front surface cooler 12 is in communication with the inlet of the three-stage double-channel condensing module, the exhaust gas outlet of the three-stage double-channel condensing module is in communication with the exhaust gas inlet of the first heat exchanger 21, the exhaust gas outlet of the first heat exchanger 21 is in communication with the inlet of the caustic washing tower 19, the outlet of the caustic washing tower 19 is in communication with the inlet of another caustic washing tower 19, the outlet of the last caustic washing tower 19 is in communication with the dry filter 18, and the outlet of the dry filter 18 is in communication with the inlet of the activated carbon adsorption and desorption and disposable adsorption combined module 17.

[0034] Beneficially, the total pipe 25 is in communication with the inlet of the flame arrester 11, the outlet of the flame arrester 11 is in communication with the exhaust gas inlet of the front surface cooler 12, the exhaust gas outlet of the front surface cooler 12 is in communication with the inlet of the three-stage double-channel condensing module, the exhaust gas outlet of the three-stage double-channel condensing module is in communication with the exhaust gas inlet of the first heat exchanger 21, the exhaust gas outlet of the first heat exchanger 21 is in communication with the inlet of the caustic washing tower 19, the outlet of the caustic washing tower 19 is in communication with the inlet of another caustic washing tower 19, the outlet of the last caustic washing tower 19 is in communication with the dry filter 18, and the outlet of the dry filter 18 is in communication with the inlet of the activated carbon adsorption and desorption and disposable adsorption combined module 17.

[0035] Beneficially, the three-stage double-channel condensing module comprises two sets of the general cooling heat exchanger 14, the middle cooling heat exchanger 15 and the deep cooling heat exchanger 16, one side of the general cooling heat exchanger 14, the middle cooling heat exchanger 15 and the deep cooling heat exchanger 16 is provided with the refrigeration station 13 in communication, the fourth pump is arranged between the front surface cooler 12 and the general cooling heat exchanger 14, the deep cooling heat exchanger 16 is communicated with the first heat exchanger 21, the general cooling heat exchanger 14, the middle cooling heat exchanger 15 and the deep cooling heat exchanger 16 are communicated with the solvent delivery channel 26, the waste gas is divided into two channels after coming out of the front surface cooler 12 and enters the general cooling heat exchanger 14, the middle cooling heat exchanger 15 and the deep cooling heat exchanger 16 in turn for cooling and temperature reduction, most of the VOCs in the waste gas is condensed into liquid by the general cooling heat exchanger 14, the middle cooling heat exchanger 15 and the deep cooling heat exchanger 16 and then collected into the solvent delivery channel 26, and then the waste gas is heated by the first heat exchanger 21 and then enters the caustic washing tower 19.

[0036] Beneficially, the waste gas outlet of the front surface cooler 12 is communicated with the waste gas inlet of the general cooling heat exchanger 14, the waste gas outlet of the general cooling heat exchanger 14 is communicated with the waste gas inlet of the middle cooling heat exchanger 15, the waste gas outlet of the middle cooling heat exchanger 15 is communicated with the waste gas outlet of the deep cooling heat exchanger 16, and the waste gas outlet of the deep cooling heat exchanger 16 is communicated with the waste gas inlet of the first heat exchanger 21.

[0037] Beneficially, the temperatures of the general cooling heat exchanger 14, the middle cooling heat exchanger 15 and the deep cooling heat exchanger 16 are 5℃, -25℃ and -60℃ in turn.

[0038] Beneficially, the refrigeration station 13 comprises the third heat exchanger 45, one side of the third heat exchanger 45 is provided with the refrigeration unit 43, the refrigeration unit 43 is in heat exchange with the third heat exchanger 45 through freon, one side of the refrigeration unit 43 is further provided with the deep cooling storage tank 44, the deep cooling storage tank 44 is arranged in communication between the general cooling heat exchanger 14, the middle cooling heat exchanger 15 and the deep cooling heat exchanger 16 and the refrigeration unit 43, the deep cooling storage tank 44 and the refrigeration unit 43 are provided with a coolant, a fourth pump is arranged between the deep cooling storage tank 44 and the refrigeration unit 43, so that the coolant circulates in the refrigeration unit 43, the general cooling heat exchanger 14, the middle cooling heat exchanger 15, the deep cooling heat exchanger 16 and the deep cooling storage tank 44, one side of the third heat exchanger 45 is further provided with the defrosting storage tank 41, a fifth pump is arranged between the defrosting storage tank 41 and the third heat exchanger 45, the fifth pump is communicated with the third heat exchanger 45, one side of the third heat exchanger 45 is further communicated with the fourth heat exchanger 42, so that the coolant circulates in the defrosting storage tank 41, the general cooling heat exchanger 14, the middle cooling heat exchanger 15, the deep cooling heat exchanger 16 and the fourth heat exchanger 42.

[0039] Beneficially, the coolant outlet of the refrigeration unit 43 is in communication with the coolant inlets of the general cooling heat exchanger 14, the medium cooling heat exchanger 15 and the deep cooling heat exchanger 16, the coolant inlet of the refrigeration unit 43 is in communication with the deep cooling tank 44, and the coolant outlets of the general cooling heat exchanger 14, the medium cooling heat exchanger 15 and the deep cooling heat exchanger 16 are in communication with the deep cooling tank 44.

[0040] Beneficially, the coolant and freon exchange heat in the third heat exchanger 45, the freon exchanges heat with the third heat exchanger 45 and the refrigeration unit 43, the coolant inlet of the third heat exchanger 45 is in communication with the coolant outlet of the third heat exchanger 45, the coolant outlet of the third heat exchanger 45 is in communication with the coolant inlets of the general cooling heat exchanger 14, the medium cooling heat exchanger 15 and the deep cooling heat exchanger 16, the coolant outlets of the general cooling heat exchanger 14, the medium cooling heat exchanger 15 and the deep cooling heat exchanger 16 are in communication with the inlet of the defrosting tank 41, and the outlet of the defrosting tank 41 is in communication with the coolant inlet of the third heat exchanger 45.

[0041] Beneficially, the refrigerant exchanges heat with the refrigeration unit 43, and then exchanges heat with the general cooling heat exchanger 14, the medium cooling heat exchanger 15 and the deep cooling heat exchanger 16, and then returns to the refrigeration unit 43 after passing through the deep cooling tank 44 and the fourth pump, so as to realize the refrigeration function of the general cooling heat exchanger 14, the medium cooling heat exchanger 15 and the deep cooling heat exchanger 16.

[0042] Beneficially, the refrigerant can also enter the defrosting tank 41 when returning from the general cooling heat exchanger 14, the medium cooling heat exchanger 15 and the deep cooling heat exchanger 16, and then exchanges heat through the third heat exchanger 45 and the fourth heat exchanger 42, and then returns to the general cooling heat exchanger 14, the medium cooling heat exchanger 15 and the deep cooling heat exchanger 16, so as to realize the temperature adjusting function.

[0043] Beneficially, for the refrigeration station 13 between the deep cooling heat exchangers 16, the defrosting tank 41 is also in communication with the first heat exchanger 21, the fourth heat exchanger 42 is also in communication with the first heat exchanger 21, the coolant enters the first heat exchanger 21 after passing through the third heat exchanger 45 and the fourth heat exchanger 42, so as to heat the exhaust gas in the first heat exchanger 21, and then the refrigerant enters the defrosting tank 41 from the first heat exchanger 21 for circulation.

[0044] Beneficially, for the refrigeration station 13 between the deep cooling heat exchangers 16, the refrigerant inlet of the first heat exchanger 21 is in communication with the refrigerant outlet of the fourth heat exchanger 42, and the refrigerant outlet of the first heat exchanger 21 is in communication with the inlet of the defrosting tank 41.

[0045] Beneficially, one side of the fourth heat exchanger 42 can be supplied with steam or hot water for heating, so as to play an auxiliary heating role.

[0046] Beneficially, the active carbon adsorption and desorption and disposable adsorption combined module 17 comprises two active carbon tanks 34, which are in communication with the dry filter 18, and one side of the active carbon tank 34 is provided with an active carbon box 36, one side of the active carbon box 36 is provided with a fan, which is in communication with the external space, which can be in communication with the chimney, and one side of the active carbon tank 34 is further provided with an adsorption and desorption assembly.

[0047] Beneficially, the outlet of the dry filter 18 is in communication with the inlet of the active carbon tank 34, the outlet of the active carbon tank 34 is in communication with the inlet of the active carbon box 36, and the outlet of the active carbon box 36 is in communication with the chimney.

[0048] Beneficially, the adsorption and desorption assembly comprises a condenser 35 and a saturated steam passage 37, which is in communication with the condenser 35 after being in communication with the active carbon tank 34, and further comprises an air cooler 33, a circulating fan 32 and a steam heater 31, which are in communication with each other, the air cooler 33 and the steam heater 31 are in communication with the active carbon tank 34, and one side of the steam heater 31 is further in communication with the saturated steam passage 37; the active carbon bed in the active carbon tank 34 saturated with adsorption is purged with water vapor, the organic matter is desorbed by using the heat and purging effect of the water vapor, the mixed liquid and mixed steam enter the condenser 35 for condensation and cooling, and then are sent to a cryogenic cooler for cooling to become mixed liquid with lower temperature, the mixed liquid passes through a liquid separation tank, the solvent is pumped out of the boundary zone, and the waste water is treated by the owner, when the desorption is completed, the active carbon tank 34 is circulated, dried and cooled by the circulating fan 32, the circulating air is heated by the steam heater 31, so that the residual water vapor in the active carbon tank 34 is dried and removed, and the circulating air is cooled by the air cooler 33 to condense the water vapor. When the drying and removal of the residual water vapor in the active carbon tank 34 is completed, the steam is closed, the active carbon tank 34 is circulated and cooled to reach a suitable temperature, and is prepared for the next adsorption.

[0049] Beneficially, the outlet of the saturated steam passage 37 is in communication with the inlet of the steam heater 31 and the steam inlet of the active carbon tank 34, and the steam outlet of the active carbon tank 34 is in communication with the steam inlet of the condenser 35.

[0050] Beneficially, the air cooling outlet of the air cooler 33 is in communication with the air cooling inlet of the circulating fan 32, the air cooling outlet of the circulating fan 32 is in communication with the air cooling inlet of the steam heater 31, the air cooling outlet of the steam heater 31 is in communication with the air cooling inlet of the active carbon tank 34, and the air cooling outlet of the active carbon tank 34 is in communication with the air cooling inlet of the air cooler 33.

[0051] The electrolyte volatile exhaust gas generated in the crushing process and the low-temperature volatilization process is mixed through the main pipe 25. The mixed exhaust gas is then introduced into the condensing system for condensation and recovery of the solvent; the mixed process exhaust gas has a temperature of about 113°C before passing through the condensing system, and is pre-cooled to about 40°C by the front air cooler 12 to recover most of the ethylene carbonate, and then enters the 5°C, -25°C, and -60°C three-stage double-channel condenser to condense most of the VOCs in the gas into liquid. This multi-stage condensation recovery method ensures that low-melting-point substances are not frozen and blocked in the heat exchanger at a specific temperature, solving the problem of poor heat exchange efficiency. The concentration of the carbonate material is controlled within the range of 650 mg / Nm3. The condensed exhaust gas is then heated by the first heat exchanger 21 to prevent the spray tower from freezing.

[0052] The refrigeration unit 43 is a prior art, and is mainly used for cooling or refrigeration. Its working principle is to use a compressor to compress low-temperature, low-pressure refrigerant into high-temperature, high-pressure refrigerant, and then transfer heat to the environment through a heat exchanger to cool or form low temperature. Compressor part: the refrigeration unit 43 mainly consists of a compressor, a condenser, an expansion valve and an evaporator, etc. First, the refrigerant absorbs the heat of air or water from the evaporator, thereby becoming steam, and then the steam is compressed by the compressor to increase the temperature and pressure of the steam. Condenser part: at this time, the refrigerant compressed by the compressor enters the condenser (water-cooled or air-cooled), and the heat is dissipated to the surrounding environment, so that the refrigerant becomes liquid. Expansion valve part: the refrigerant after the condenser becomes liquid and presents a high temperature and high pressure state, at which time the temperature control is realized through the expansion valve part. The function of the expansion valve is to reduce the temperature of the refrigerant by limiting the flow rate and reducing the pressure of the refrigerant. Throughout the refrigeration unit process, through the cooperative action of the compressor, condenser, expansion valve and evaporator, the refrigerant is always in a cycle, and in the process of continuously absorbing and releasing heat, the purpose of cooling and refrigeration is achieved.

[0053] The compressor in the refrigeration unit 43 starts refrigeration, and the pump circulates the low-temperature coolant in the entire water tank to circulate the low-temperature coolant to the set temperature. After the coolant reaches the set temperature, the external circulation pump circulates the coolant to the first heat exchanger 21. After the first heat exchanger 21 reaches the set temperature, the exhaust gas starts to enter. When there is no exhaust gas entering, the pump always maintains the low-temperature coolant at the set temperature in real time. The compressor is always in a light load state. In this state, the user can enter the exhaust gas at any time, and the unit does not need to be started in advance. This design automatically adjusts the energy consumption of the unit according to the use flow, greatly saving the overall energy consumption of the user. The use of cold storage allows the compressor in the refrigeration unit 43 to be used alternately, allowing the compressor in the refrigeration unit 43 to have sufficient rest, greatly extending the service life of the compressor in the refrigeration unit 43. With the use of cold storage, the exhaust gas can enter the unit at any time and place, and the unit does not need to be started in advance, reducing the load impact on the compressor system.

[0054] The third heat exchanger 45 is provided with a defrosting storage tank 41, a refrigeration unit 43, and a deep cooling storage tank 44 on both sides, which can realize the cold and heat control of the entire refrigeration station 13.

[0055] In addition, considering that carbonates all have crystallization phenomenon, to prevent defrosting from being not timely, a heat medium is used as an intermediate carrier. When defrosting is not timely, steam or hot water can be used to pass through the fourth heat exchanger 42 to provide additional heat to enhance the defrosting effect and ensure the timeliness of defrosting.

[0056] The condensed exhaust gas after heat recovery is subjected to alkali washing to recover most of the absorbed PF5 gas. PF5 hydrolysis PF5+H2O=POF3+2HF, and the acid gas generated by hydrolysis further undergoes a neutralization reaction. To prevent incomplete neutralization of the acid gas generated by alkali washing in the alkali washing tower 19, the alkali washing tower 19 is designed to have two-stage alkali washing to absorb the acid gas. The industrial exhaust gas after passing through the alkali washing tower 19 is subjected to activated carbon adsorption purification treatment, so that the exhaust gas meets the emission standard.

[0057] The exhaust gas is subjected to water removal pretreatment by a dry filter 18 before entering the activated carbon adsorption (to reduce the adsorption load of activated carbon). The activated carbon uses an adsorption and desorption process. One activated carbon tank 34 is adsorbing while the other activated carbon tank 34 is desorbing. The two activated carbon tanks 34 are alternately adsorbed, and finally, a one-time activated carbon adsorption is performed to ensure that the emission meets the standard. After the activated carbon tank 34 completes the adsorption, saturated water vapor is introduced for desorption. The water vapor is used to blow the activated carbon bed layer saturated with adsorption, and the heat and blowing action of the water vapor are used to desorb the organic matter. The mixed liquid and mixed steam enter the condenser 35 for condensation and cooling, and then are sent to the deep cooling device to become mixed liquid with lower temperature. The mixed liquid passes through a liquid separation tank, and the solvent is pumped out of the boundary zone, and the waste water is treated by the owner.

[0058] When the desorption is completed, the circulating fan 32 is used to circulate dry cooling of the activated carbon tank 34, the circulating air is heated by the steam heater 31, so that the residual water vapor in the activated carbon tank 34 is baked and removed, and the circulating air is cooled by the surface cooler 33 to condense the water vapor. When the baking and removal of the residual water vapor in the activated carbon tank 34 is completed, the steam is closed, and the activated carbon tank 34 is circulated and cooled to reach a suitable temperature, ready for the next adsorption.

[0059] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement without creative labor should be covered within the protection scope of the present application; therefore, the protection scope of the present application should be limited by the protection scope defined in the claims.

Claims

1. A lithium battery dismantling waste gas recovery and treatment system, comprising a main pipe (25) through which battery dismantling waste gas is introduced, characterized in that, A flame arrester (11) is connected to one side of the main pipe (25), a front surface cooler (12) is connected to one side of the flame arrester (11), a three-stage dual-channel condensing module capable of multi-stage cooling of exhaust gas is connected to one side of the front surface cooler (12), a first heat exchanger (21) is connected to one side of the three-stage dual-channel condensing module, a multi-stage alkaline scrubbing tower (19) is connected to one side of the first heat exchanger (21), the alkaline scrubbing towers (19) are connected to each other, a dry filter (18) is connected to one side of the last alkaline scrubbing tower (19), an activated carbon adsorption-desorption and one-time adsorption combination module (17) for desorption of exhaust gas is connected to one side of the dry filter (18), and a solvent recovery channel is provided at the bottom of the three-stage dual-channel condensing module.

2. The lithium battery dismantling waste gas recovery and treatment system according to claim 1, characterized in that: The activated carbon adsorption-desorption and disposable adsorption combination module (17) includes two activated carbon tanks (34), which are connected to the dry filter (18). An activated carbon box (36) is connected to one side of the activated carbon tank (34), and a fan is connected to one side of the activated carbon box (36). The fan is connected to the external space, and an adsorption-desorption component is also provided on one side of the activated carbon tank (34).

3. The lithium battery dismantling waste gas recovery and treatment system according to claim 2, characterized in that: The adsorption-desorption assembly includes a condenser (35) and a saturated steam channel (37), which is connected to the condenser (35) after being connected to the activated carbon tank (34). It also includes a surface cooler (33), a circulating fan (32), and a steam heater (31), which are connected to each other. The surface cooler (33) and the steam heater (31) are connected to the activated carbon tank (34), and one side of the steam heater (31) is also connected to the saturated steam channel (37).

4. The lithium battery dismantling waste gas recovery and treatment system according to claim 1, characterized in that: The three-stage dual-channel condensation module includes two sets of general cooling heat exchangers (14), intermediate cooling heat exchangers (15), and cryogenic heat exchangers (16). A refrigeration station (13) is connected to one side of each of the general cooling heat exchangers (14), intermediate cooling heat exchangers (15), and cryogenic heat exchangers (16). The cryogenic heat exchangers (16) are connected to the first heat exchanger (21). The general cooling heat exchangers (14), intermediate cooling heat exchangers (15), and cryogenic heat exchangers (16) are connected to the solvent delivery channel (26). After the exhaust gas comes out of the front surface cooler (12), it is divided into two channels and enters the general cooling heat exchangers (14), intermediate cooling heat exchangers (15), and cryogenic heat exchangers (16) in sequence for cooling.

5. The lithium battery dismantling waste gas recovery and treatment system according to claim 4, characterized in that: The refrigeration station (13) includes a third heat exchanger (45), on one side of which a refrigeration unit (43) is installed. The refrigeration unit (43) exchanges heat with the third heat exchanger (45). A cryogenic storage tank (44) is also installed on one side of the refrigeration unit (43). The cryogenic storage tank (44) is connected to the general refrigeration heat exchanger (14), the intermediate refrigeration heat exchanger (15), and the cryogenic heat exchanger (16) and the refrigeration unit (43). The cryogenic storage tank (44) and the refrigeration unit (43) are equipped with... The refrigerant is provided and circulates in the refrigeration unit (43), the general cooling heat exchanger (14), the intermediate cooling heat exchanger (15), the cryogenic heat exchanger (16), and the cryogenic storage tank (44). A defrosting storage tank (41) is also provided on one side of the third heat exchanger (45), and a fourth heat exchanger (42) is also connected to one side of the third heat exchanger (45). The refrigerant circulates in the defrosting storage tank (41), the general cooling heat exchanger (14), the intermediate cooling heat exchanger (15), the cryogenic heat exchanger (16), and the fourth heat exchanger (42).

6. The lithium battery dismantling waste gas recovery and treatment system according to claim 5, characterized in that: After exchanging heat with the refrigeration unit (43), the refrigerant enters the general cooling heat exchanger (14), the intermediate cooling heat exchanger (15) and the cryogenic heat exchanger (16) for heat exchange. After heat exchange, the refrigerant enters the cryogenic storage tank (44) and the fourth pump and then flows back to the refrigeration unit (43) for heat exchange.

7. The lithium battery dismantling waste gas recovery and treatment system according to claim 5, characterized in that: When the refrigerant flows back from the general cooling heat exchanger (14), the intermediate cooling heat exchanger (15) and the cryogenic heat exchanger (16), it can also enter the defrost storage tank (41) for storage, and then undergo heat exchange through the third heat exchanger (45), and then through the fourth heat exchanger (42) before flowing back to the general cooling heat exchanger (14), the intermediate cooling heat exchanger (15) and the cryogenic heat exchanger (16).

8. The lithium battery dismantling waste gas recovery and treatment system according to claim 7, characterized in that: For the refrigeration station (13) between the cryogenic heat exchangers (16), the defrosting tank (41) is also connected to the first heat exchanger (21), and the fourth heat exchanger (42) is also connected to the first heat exchanger (21). The refrigerant enters the first heat exchanger (21) after passing through the third heat exchanger (45) and the fourth heat exchanger (42).

9. A lithium battery dismantling waste gas recovery and treatment system according to claim 8, characterized in that: Steam or hot water is introduced into one side of the fourth heat exchanger (42) for heating.

10. A lithium battery dismantling waste gas recovery and treatment system according to any one of claims 1-9, characterized in that: The temperature of the exhaust gas before passing through the main pipe (25) is 113°C, and the temperature of the exhaust gas after passing through the front surface cooler (12) is 40°C. The temperatures set in the three-stage dual-channel condensation module are 5°C, -25°C and -60°C, respectively.

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