Waste gas treatment energy-saving device for lithium battery anode and cathode material production line

Abstract

The utility model belongs to the field of lithium battery anode and cathode material production line waste gas treatment and energy conservation, and provides a lithium battery anode and cathode material production line waste gas treatment and energy conservation device which comprises a dust removal device, an RTO heat storage incineration system and a waste heat recovery system. And the heat of the incinerated high-temperature waste gas is recovered through a waste heat recovery device. According to the utility model, particulate matters in the flue gas are removed through the dust removal device, so that the concentration of the particulate matters in the flue gas can be greatly reduced, and the particulate matters can be discharged up to the standard while a guarantee is provided for normal operation of a follow-up RTO (Regenerative Thermal Oxidation) system; vOCs in the flue gas are effectively treated and removed through the RTO system, the removal efficiency can reach 99% or above, the concentration of the VOCs and the concentration of odor in the flue gas can be effectively reduced, meanwhile, the heat efficiency of the RTO system is greatly improved compared with that of a TO furnace in an original system, and natural gas consumption can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of waste gas treatment and energy saving in production lines of positive and negative electrode materials for lithium batteries, in particular to a waste gas treatment and energy saving device in production lines of positive and negative electrode materials for lithium batteries. Background Art

[0002] With the rapid development of the electric vehicle industry, the demand for lithium batteries is increasing day by day. At the same time, environmental emission requirements are becoming more and more stringent, and enterprises are increasing their efforts to control pollution. The treatment of waste gas from lithium battery production is also receiving more and more attention. Comprehensively considering the characteristics of lithium battery positive and negative electrode material production line waste gas containing particulate matter, VOCs, odor and high temperature. In order to meet the waste gas treatment standards and recover the heat in the waste gas, and at the same time compare the one-time investment and operating cost of the waste gas treatment system, the energy-saving devices for waste gas treatment of lithium battery positive and negative electrode material production lines will be increasingly used in related treatment projects.

[0003] At present, the treatment of this type of waste gas is basically carried out by using the TO combustion furnace equipped with the roller kiln, which has the disadvantages of high fuel operation cost, incomplete treatment, and a large amount of heat not being recovered. If the environmental protection standard is not met and a large amount of heat in the waste gas is not recovered, it will bring certain economic losses to the enterprise.

[0004] The present invention makes new attempts and research and development under such background, and proposes a new idea and system for waste gas treatment and energy-saving device of lithium battery positive and negative electrode material production line to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and to provide an energy-saving device for waste gas treatment of lithium battery positive and negative electrode material production lines, which can ensure that pollutants are discharged in compliance with standards during normal production of the enterprise production line, and can efficiently recover waste heat in the flue gas for use in the production and life of the enterprise, thereby facilitating energy conservation and reducing fuel operating costs.

[0006] The technical solution of the utility model is: an energy-saving device for waste gas treatment of a lithium battery positive and negative electrode material production line, including a dust removal device, an RTO thermal storage incineration system and a waste heat recovery system. The waste gas enters the dust removal device through a pipeline and then enters the RTO thermal storage incineration system for incineration. The high-temperature waste gas after incineration recovers heat through a waste heat recovery device.

[0007] Preferably, the waste gas from the lithium battery positive and negative electrode material production line enters the RTO thermal storage incineration system for incineration to remove VOCs and odors after entering the dust removal device for particulate matter removal. The high-temperature waste gas after incineration is heat recovered by the waste heat recovery device. Placing the dust removal device before the RTO thermal storage incineration system can effectively remove dust from the flue gas, and simultaneously solve the risk of heat storage body blockage caused by high-dust gas entering the RTO thermal storage incineration system, ensuring the normal operation of the RTO thermal storage incineration system.

[0008] The advantage of this solution is that the waste gas treatment energy-saving device can effectively save the natural gas consumption of the original TO furnace, so as to save operating costs. At the same time, it can solve the problem that the combustion temperature of the original TO furnace system is not enough and the pollutant cannot be completely met, thereby achieving environmental protection and economic benefits simultaneously.

[0009] Furthermore, the dust removal device is a dry dust removal device, and the dry dust removal device is a bag dust removal device or an electric dust removal device. Preferably, during use, the dust removal device can be selected according to the temperature of the flue gas, the characteristics of the particulate matter and the initial concentration.

[0010] Furthermore, the bag filter is provided with a filter bag, and the inlet of the bag filter is provided with a smoke temperature regulating device for controlling the smoke temperature, and the smoke temperature regulating device includes a cold air door and a control valve, and the cold air door uses an electric or pneumatic valve to control the air intake. Preferably, the bag filter can use PTFE material, fluorosilicone material or metal filter bags according to the smoke temperature; the cold air door is set to protect the filter bag.

[0011] Furthermore, the RTO thermal storage incineration system includes a thermal storage chamber and a combustion system. The thermal storage chamber is provided with a ceramic thermal storage body, and the thermal storage body has a honeycomb structure or a plate structure. Preferably, the combustion system includes a burner, and the burner is connected to the thermal storage chamber. The number of burners is determined according to the size of the thermal storage incineration device, and can be 1-3 or more. The burner can be a gas burner or an oil burner.

[0012] Furthermore, the length of the honeycomb heat storage body or the plate heat storage body is 100-150mm, the width is 100-150mm, and the height is 100-300mm; the number of holes inside the honeycomb heat storage body is 25×25, 40×40, 43×43, 50×50 or 60×60; the shape of the through hole is square, rectangular, regular hexagon, circular or triangular.

[0013] Furthermore, the heat storage body includes an upper heat storage heat exchanger and a lower heat storage anti-blocking layer, and a saddle ring filler is arranged in the lower heat storage anti-blocking layer. Preferably, the problem of heat storage body being blocked is effectively solved by setting the upper heat storage heat exchanger and the lower heat storage anti-blocking layer. During normal operation, the heat storage chamber is kept in the normal heat storage and heat release process of air intake, air outlet and purge, ensuring that the exhaust gas can be effectively treated and the pollutants can be discharged in compliance with the standards.

[0014] Furthermore, the heat storage chambers are provided in 2-9 numbers and are arranged side by side in the body of the RTO heat storage incineration device.

[0015] Furthermore, each heat storage chamber is equipped with an air intake valve, an exhaust valve and a purge valve, and the valves are lifted by cylinders; the inlet of the air intake valve is connected to the outlet of the organic waste gas conveying fan, and the outlet of the air intake valve is connected to the lower part of the heat storage anti-blocking layer; the inlet of the exhaust valve is connected to the lower part of the heat storage anti-blocking layer, and the outlet of the exhaust valve is connected to the exhaust gas post-treatment device; the inlet of the purge valve is connected to the lower part of the heat storage anti-blocking layer, and the outlet of the purge valve is connected to the inlet of the organic waste gas conveying fan; a regulating valve and a purge air flowmeter are provided between the purge valve and the organic waste gas conveying fan to adjust the amount of purge air to ensure that the amount of purge air is 5%-10% of the total air volume.

[0016] Furthermore, 1 to 3 organic waste gas conveying fans are required; 3 sets of temperature measuring equipment and over-temperature explosion-proof systems are installed on the combustion chamber, and the burner and over-temperature explosion-proof valve can be controlled and adjusted according to the temperature measurement conditions.

[0017] Furthermore, the waste heat recovery device is an air-to-air heat exchanger or an air-to-water heat exchanger; the heat exchange pipe of the air-to-water heat exchanger is a composite pipe, a fluoroplastic pipe, a stainless steel pipe or an ND steel pipe.

[0018] The utility model has the following characteristics:

[0019] 1. The utility model removes particulate matter in the flue gas through a dust removal device, which can significantly reduce the concentration of particulate matter in the flue gas, provide guarantee for the normal operation of the subsequent RTO system and ensure that the particulate matter can be discharged in compliance with the standard.

[0020] 2. The RTO system can effectively treat and remove VOCs in the flue gas, with a removal efficiency of more than 99%. It can effectively reduce the concentration of VOCs and odor in the flue gas. At the same time, the thermal efficiency of the RTO system is greatly improved compared to the TO furnace in the original system, which can effectively save natural gas consumption.

[0021] 3. A waste heat recovery device is used to recover the heat in the flue gas. The recovered heat can be used for the company's living and production heat, effectively saving energy. The utility model can simultaneously achieve environmental protection and economic benefits for the company.

[0022] The detailed structure of the present utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 - is a schematic diagram of the structure of the utility model;

[0024] 1- smoke temperature regulating device, 2- dust removal device, 3- purge air flow meter, 4- pressure difference device, 5- vibrator, 6- regulating valve, 7- organic waste gas conveying fan, 8- air intake valve, 9- exhaust valve, 10- purge valve, 11- heat storage anti-blocking layer, 12- heat storage heat exchanger, 13- combustion-supporting fan, 14- gas delivery valve group, 15- burner, 16- temperature measuring device, 17- safety valve, 18- waste heat recovery device, 19- chimney. DETAILED DESCRIPTION

[0025] As shown in the attached figure:

[0026] A waste gas treatment and energy-saving device for a lithium battery positive and negative electrode material production line includes a dust removal device 2, an RTO thermal storage incineration system and a waste heat recovery system. The waste gas enters the dust removal device 2 through a pipeline and then enters the RTO thermal storage incineration system for incineration. The high-temperature waste gas after incineration recovers heat through a waste heat recovery device 18, and the flue gas after waste heat recovery is discharged through a chimney 19.

[0027] Preferably, the waste gas from the lithium battery positive and negative electrode material production line enters the RTO thermal storage incineration system for incineration to remove VOCs and odors after entering the dust removal device 2 for particulate matter removal, and the high-temperature waste gas after incineration is heat recovered by the waste heat recovery device 18. Placing the dust removal device 2 before the RTO thermal storage incineration system can effectively remove dust from the flue gas, and simultaneously solve the risk of heat storage body blockage caused by high-dust gas entering the RTO thermal storage incineration system, thereby ensuring the normal operation of the RTO thermal storage incineration system.

[0028] The utility model waste gas treatment energy-saving device can effectively save the natural gas consumption of the original TO furnace to achieve the saving of operating costs. At the same time, it solves the problem that the combustion temperature of the original TO furnace system is not enough and the pollutant cannot be completely met during operation, thereby achieving environmental protection and economic benefits simultaneously.

[0029] The dust removal device 2 is a dry dust removal device 2, and the dry dust removal device 2 is a bag dust removal or an electric dust removal. Preferably, the dust removal device 2 can be selected according to the temperature of the flue gas, the characteristics of the particulate matter and the initial concentration during use. Preferably, the dust removal device 2 of the utility model adopts a bag dust collector, which is provided with a filter bag. The inlet of the bag dust collector is provided with a smoke temperature regulating device 1 for controlling the smoke temperature. The smoke temperature regulating device 1 includes a cold air door and a control valve. The cold air door uses an electric or pneumatic valve to control the air intake. Preferably, the bag dust collector can also use PTFE material, fluorosilicone material or metal filter bags according to the flue gas temperature. Metal filter bags are selected when the smoke temperature is above 260°C, PTFE filter bags are selected when the smoke temperature is between 200-260°C, and fluorosilicone filter bags are selected when the smoke temperature is between 110-200°C; preferably, the filter bags in the bag dust removal in this embodiment are made of PTFE material, and the filtration wind speed is controlled at 0.6-1.0m / min; the setting of the cold air door is used to protect the filter bags and increase the service life of the filter bags. Preferably, the inlet and outlet of the dust removal device 2 are both provided with a pressure difference device 4 for monitoring the normal operation of the dust removal device 2. At the same time, a vibrator 5 is provided at the lower end of the dust removal device 2 to shake off the dust accumulated on the inner wall of the dust removal device 2 and the bag, thereby avoiding blockage caused by excessive dust accumulation and ensuring the dust removal efficiency of the dust removal device 2.

[0030] The RTO heat storage incineration system includes a heat storage chamber and a combustion system. A ceramic heat storage body is arranged in the heat storage chamber, and the heat storage body has a honeycomb structure or a plate structure. Preferably, the combustion system includes a burner 15, a combustion-supporting fan 13 and a gas delivery valve group 14. The burner 15 is connected to the heat storage chamber. The number of burners 15 is determined according to the size of the heat storage incineration device, which can be 1-3 or more. The burner 15 can be a gas burner 15 or an oil burner 15; preferably, in this embodiment, one burner 15 is set, and the combustion-supporting fan 13 and the gas delivery valve group 14 are evenly connected to the burner 15, which are used to transport air and gas respectively to ensure the normal operation of the burner 15.

[0031] In an embodiment, the length of the honeycomb heat storage body or the plate heat storage body is 100-150mm, the width is 100-150mm, and the height is 100-300mm; the number of holes inside the honeycomb heat storage body is 25×25, 40×40, 43×43, 50×50 or 60×60; the shape of the through holes is square, rectangular, regular hexagonal, circular or triangular; optimally, in this embodiment, the length, width and height of the heat storage body are 150×150×150mm; the number of holes on the heat storage body is 50×50, and the through holes are regular hexagonal.

[0032] In the embodiment, the heat storage body includes an upper heat storage heat exchanger 12 and a lower heat storage anti-blocking layer 11, and a saddle ring filler is provided in the lower heat storage anti-blocking layer 11. Preferably, the problem of heat storage body being blocked is effectively solved by the arrangement of the upper heat storage heat exchanger 12 and the lower heat storage anti-blocking layer 11. During normal operation, the heat storage chamber is kept in the normal heat storage and heat release process of air intake, air outlet and purge, ensuring that the exhaust gas can be effectively treated and the pollutants can be discharged in compliance with the standards.

[0033] In implementation, the RTO thermal storage and incineration device is provided with a temperature measuring device 16, an explosion-proof port and a safety valve 17 to ensure the safe operation of the equipment. In addition, 2-9 thermal storage chambers are arranged side by side in the body of the RTO thermal storage and incineration device; preferably, 3 thermal storage chambers are arranged in this embodiment.

[0034] Preferably, each heat storage chamber is equipped with an air intake valve 8, an exhaust valve 9 and a purge valve 10, and the valves are all lifted by cylinders; the inlet of the air intake valve 8 is connected to the outlet of the organic waste gas conveying fan 7, and the outlet of the air intake valve 8 is connected to the lower part of the heat storage anti-blocking layer 11; the inlet of the exhaust valve 9 is connected to the lower part of the heat storage anti-blocking layer 11, and the outlet of the exhaust valve 9 is connected to the exhaust gas post-treatment device; the inlet of the purge valve 10 is connected to the lower part of the heat storage anti-blocking layer 11, and the outlet of the purge valve 10 is connected to the inlet of the organic waste gas conveying fan 7; an adjusting valve 6 and a purge air flowmeter 3 are provided between the purge valve 10 and the organic waste gas conveying fan 7, which are used to adjust the amount of purge air to ensure that the amount of purge air is 5%-10% of the total air volume.

[0035] In the embodiment, two organic waste gas conveying fans 7 are required, one is a low-load organic waste gas conveying fan 7, and the other is a high-load organic waste gas conveying fan 7, and their operation is automatically switched according to the load used; three sets of temperature measuring equipment and over-temperature explosion-proof systems are arranged on the combustion chamber, and the burner 15 and the over-temperature explosion-proof valve can be controlled and adjusted according to the temperature measurement conditions.

[0036] In the embodiment, the waste heat recovery device 18 is an air-to-air heat exchanger or an air-to-water heat exchanger; preferably, in the present embodiment, the waste heat recovery device 18 adopts an air-to-water heat exchanger, and the heat exchange pipe of the air-to-water heat exchanger is a composite pipe, a fluoroplastic pipe, a stainless steel pipe or an ND steel pipe; in the present embodiment, the heat exchange pipe of the air-to-water heat exchanger adopts a composite pipe, and the flue gas temperature is required to be reduced from 240°C to 110°C, and the waste heat is used for water in the owner's canteen and staff dormitory.

[0037] The utility model removes particulate matter in the flue gas through the dust removal device 2, which can significantly reduce the concentration of particulate matter in the flue gas, provide guarantee for the normal operation of the subsequent RTO system and ensure that the particulate matter can meet the emission standards; the VOCs in the flue gas are effectively treated and removed through the RTO system, and the removal efficiency can reach more than 99%, which can effectively reduce the concentration of VOCs and odor in the flue gas. At the same time, the thermal efficiency of the RTO system is significantly improved compared with the TO furnace in the original system, which can effectively save natural gas consumption; the waste heat recovery device 18 is used to recover the heat in the flue gas, and the recovered heat can be used for the living and production heat of the enterprise, which effectively saves energy. The utility model can simultaneously achieve the environmental protection and economic benefits of the relevant enterprises.

[0038] The above are preferred embodiments of the present invention and the technical principles used therein. For those skilled in the art, without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the present invention are within the protection scope of the present invention.

Claims

1. An energy-saving device for waste gas treatment of a lithium battery positive and negative electrode material production line, comprising a dust removal device, an RTO thermal storage incineration system and a waste heat recovery system, characterized in that: The exhaust gas enters the dust removal device through a pipeline and then enters the RTO thermal storage incineration system for incineration. The high-temperature exhaust gas after incineration recovers heat through a waste heat recovery device.

2. The waste gas treatment and energy-saving device for lithium battery positive and negative electrode material production line according to claim 1 is characterized by: The dust removal device is a dry dust removal device, and the dry dust removal device is a bag dust removal or an electric dust removal.

3. The waste gas treatment and energy-saving device for lithium battery positive and negative electrode material production line according to claim 2 is characterized by: A filter bag is arranged inside the bag filter. A smoke temperature regulating device for controlling the smoke temperature is arranged at the inlet of the bag filter. The smoke temperature regulating device comprises a cold air door and a control valve. The cold air door adopts an electric or pneumatic valve to control the air intake.

4. The waste gas treatment and energy-saving device for lithium battery positive and negative electrode material production line according to claim 1 is characterized by: The RTO thermal storage and incineration system comprises a thermal storage chamber and a combustion system. A ceramic thermal storage body is arranged in the thermal storage chamber. The thermal storage body has a honeycomb structure or a plate structure.

5. The waste gas treatment and energy-saving device for lithium battery positive and negative electrode material production line according to claim 4 is characterized by: The length of the honeycomb heat storage body or the plate heat storage body is 100-150mm, the width is 100-150mm, and the height is 100-300mm; the number of holes inside the honeycomb heat storage body is 25×25, 40×40, 43×43, 50×50 or 60×60; the shape of the through hole is square, rectangular, regular hexagon, circular or triangular.

6. The waste gas treatment and energy-saving device for lithium battery positive and negative electrode material production line according to claim 4 is characterized by: The heat storage body comprises an upper heat storage heat exchanger and a lower heat storage anti-blocking layer, and a saddle ring filler is arranged in the lower heat storage anti-blocking layer.

7. The waste gas treatment and energy-saving device for lithium battery positive and negative electrode material production line according to claim 4 is characterized by: The heat storage chambers are arranged in 2 to 9 numbers and are arranged side by side in the RTO heat storage incineration device body.

8. The waste gas treatment and energy-saving device for lithium battery positive and negative electrode material production line according to claim 7 is characterized by: Each heat storage chamber is equipped with an air intake valve, an exhaust valve and a purge valve, and the valves are lifted by cylinders; the inlet of the air intake valve is connected to the outlet of the organic waste gas conveying fan, and the outlet of the air intake valve is connected to the lower part of the heat storage anti-blocking layer; the inlet of the exhaust valve is connected to the lower part of the heat storage anti-blocking layer, and the outlet of the exhaust valve is connected to the exhaust gas post-treatment device; the inlet of the purge valve is connected to the lower part of the heat storage anti-blocking layer, and the outlet of the purge valve is connected to the inlet of the organic waste gas conveying fan; a regulating valve and a purge air flow meter are provided between the purge valve and the organic waste gas conveying fan.

9. The waste gas treatment and energy-saving device for lithium battery positive and negative electrode material production line according to claim 8 is characterized by: The organic waste gas conveying fans need to be installed 1-3 units; 3 sets of temperature measuring equipment and over-temperature explosion-proof systems are installed on the combustion chamber.

10. An energy-saving device for treating waste gas from a production line of positive and negative electrode materials for lithium batteries according to any one of claims 1 to 9, characterized in that: The waste heat recovery device is an air-to-air heat exchanger or an air-to-water heat exchanger; the heat exchange pipe of the air-to-water heat exchanger is a composite pipe, a fluoroplastic pipe, a stainless steel pipe or an ND steel pipe.

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