Battery workshop tail gas treatment device

Abstract

The application discloses a battery workshop tail gas treatment device, which comprises a static pressure tank, an electrostatic oil mist processor, an alkali washing tower, a demisting tank, a first activated carbon adsorption bed, a second activated carbon adsorption bed, a desorption fan, a dual-function desorption heat exchanger, a catalytic combustion furnace, a main fan and a main chimney; the static pressure tank, the electrostatic oil mist processor, the alkali washing tower and the demisting tank are sequentially communicated; the first activated carbon adsorption bed and the second activated carbon adsorption bed are connected in parallel to the output end of the demisting tank; the dual-function desorption heat exchanger and the catalytic combustion furnace form a desorption regeneration loop with the first activated carbon adsorption bed and the second activated carbon adsorption bed, and the battery workshop VOCs tail gas can be continuously, efficiently, energy-savingly and up-to-standard purified, and the application has the advantages of reasonable structure layout, stable operation, low energy consumption, high safety, high practicability and the like.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and in particular to a battery workshop exhaust gas treatment device. Background Technology

[0002] During the lithium battery production process, vacuum pumps in processes such as liquid injection and formation will discharge complex mixed exhaust gases containing carbonates, fluorosilanes, acidic gases, combustible gases, and oil mist. If these exhaust gases are discharged directly, they will pollute the environment, harm the health of operators, rapidly corrode production and processing equipment, and easily cause catalyst poisoning and failure. Therefore, they must be subjected to safe, efficient, and stable purification treatment.

[0003] Currently, the industry mostly uses traditional treatment processes such as filtration, alkaline washing, and direct discharge after activated carbon adsorption. These processes generally require the activated carbon to be shut down for regeneration, which cannot meet the needs of continuous production in the workshop. At the same time, when desorbing and analyzing the waste gas concentrated by adsorption inside the activated carbon, the process relies on electric heating, which consumes a lot of energy and has no waste heat recovery, resulting in serious energy waste.

[0004] Furthermore, the system has complex piping, large airflow pulsation, and lacks anti-corrosion design for the strong acidic corrosive components in the exhaust gas, making the equipment susceptible to corrosion damage.

[0005] Furthermore, improper treatment and incomplete purification of combustible gases in the exhaust gas pose significant safety risks, making it difficult to meet the requirements for efficient, continuous, low-energy consumption, and compliant emission treatment of complex exhaust gases from lithium battery workshops. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a battery workshop exhaust gas treatment device.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] A battery workshop exhaust gas treatment device includes a static pressure box, an electrostatic oil mist processor, an alkaline scrubbing tower, a demister, a first activated carbon adsorption bed, a second activated carbon adsorption bed, a desorption fan, a dual-function desorption heat exchanger, a catalytic combustion furnace, a main fan, and a main chimney; the static pressure box, the electrostatic oil mist processor, the alkaline scrubbing tower, and the demister are connected in sequence; the first activated carbon adsorption bed and the second activated carbon adsorption bed are connected in parallel to the output end of the demister; the dual-function desorption heat exchanger, the catalytic combustion furnace, and the first and second activated carbon adsorption beds form a desorption regeneration loop.

[0009] The configuration is further defined as follows: the output end of the static pressure box is connected to the input end of the electrostatic oil mist processor, the output end of the electrostatic oil mist processor is connected to the input end of the alkaline washing tower, and the output end of the alkaline washing tower is connected to the input end of the demister.

[0010] The configuration is further defined as follows: the purification output ends of the first activated carbon adsorption bed and the second activated carbon adsorption bed are connected to the input end of the main fan, and the output end of the main fan is connected to the main chimney.

[0011] The dual-function desorption heat exchanger is further configured to have independent, non-mixed, and non-directly contacting fresh air channels, exhaust gas channels, and flue gas channels.

[0012] The configuration is further defined as follows: the desorption output ends of the first activated carbon adsorption bed and the second activated carbon adsorption bed are connected to the exhaust gas input end of the dual-function desorption heat exchanger, and the exhaust gas output end of the dual-function desorption heat exchanger is connected to the input end of the catalytic combustion furnace.

[0013] The configuration is further defined as follows: the output end of the catalytic combustion furnace is connected to the flue gas input end of the dual-function desorption heat exchanger, and the flue gas output end of the dual-function desorption heat exchanger is connected to the input end of the main blower.

[0014] The configuration is further defined as follows: the fresh air output end of the dual-function desorption heat exchanger is connected to the input end of the desorption fan, and the output end of the desorption fan is connected to the desorption input ends of the first activated carbon adsorption bed and the second activated carbon adsorption bed, respectively.

[0015] Further configuration: The alkaline washing tower is made of PP / FRP corrosion-resistant material.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0017] 1. It adopts a dual activated carbon adsorption bed parallel alternating operation structure to achieve one bed adsorption and one bed synchronous regeneration, which can continuously process 24 hours a day without stopping the machine, meeting the continuous production needs of the battery workshop.

[0018] 2. The dual-function desorption heat exchanger enables the cascade recovery and recycling of waste heat from high-temperature flue gas, preheating the desorbed fresh air and high-concentration waste gas without the need for additional electric heating, significantly reducing system energy consumption and avoiding energy waste.

[0019] 3. A static pressure box is installed at the front end of the system, which can stabilize the flow, equalize the pressure and buffer the pulsation of the exhaust gas, optimize the airflow field, reduce airflow pulsation and pipeline vibration, and improve the stability of system operation.

[0020] 4. The alkaline washing tower is made of PP / FRP anti-corrosion material, which can withstand strong acidic corrosive gases such as HF and POF3, effectively preventing equipment corrosion and extending the overall service life of the unit.

[0021] 5. A catalytic combustion furnace is used to perform flameless catalytic oxidation decomposition of high-concentration organic waste gas and combustible components, resulting in thorough harmless treatment without open flame and with high safety.

[0022] In summary, the present invention has a reasonable structural layout, stable operation, low energy consumption, and high safety. It can achieve continuous, efficient, energy-saving, and compliant purification treatment of VOCs exhaust gas in battery workshops, and has strong practicality. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Attached reference numerals: 1. Static pressure box; 2. Electrostatic oil mist processor; 3. Alkali washing tower; 4. Demister; 5. First activated carbon adsorption bed; 6. Second activated carbon adsorption bed; 7. Desorption fan; 8. Dual-function desorption heat exchanger; 9. Catalytic combustion furnace; 10. Main fan; 11. Main chimney. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Example

[0030] Reference Figure 1 The present invention discloses a battery workshop exhaust gas treatment device, including a static pressure box 1, an electrostatic oil mist processor 2, an alkaline washing tower 3, a demister 4, a first activated carbon adsorption bed 5, a second activated carbon adsorption bed 6, a desorption fan 7, a dual-function desorption heat exchanger 8, a catalytic combustion furnace 9, a main fan 10, and a main chimney 11.

[0031] The static pressure box 1, electrostatic oil mist processor 2, alkaline scrubbing tower 3, and demister 4 are arranged sequentially along the main exhaust gas treatment path; the first activated carbon adsorption bed 5 and the second activated carbon adsorption bed 6 are connected in parallel at the output end of the demister 4; the dual-function desorption heat exchanger 8 and the catalytic combustion furnace 9 constitute a desorption regeneration and waste heat recovery loop.

[0032] The system comprises the following components: a static pressure chamber 1 for stabilizing, equalizing, and buffering the flow and pressure of the exhaust gas, ensuring a stable system flow field; an electrostatic oil mist processor 2 for removing oil mist and liquid particles from the exhaust gas, preventing blockage of downstream equipment; an alkaline scrubbing tower 3 made of PP / FRP corrosion-resistant material for removing acidic corrosive components from the exhaust gas, achieving purification of acidic pollutants; a demister 4 for removing mist droplets and water vapor from the airflow, ensuring the adsorption efficiency of the adsorption unit; a first activated carbon adsorption bed 5 for adsorbing organic pollutants such as VOCs from the exhaust gas, achieving gas purification; and a second activated carbon adsorption bed 6 for alternating operation with the first activated carbon adsorption bed 5, enabling continuous system operation. This device uses the first activated carbon adsorption bed 5 and the second activated carbon adsorption bed 6 in parallel alternating operation, with one bed adsorbing and the other regenerating synchronously, automatically switching to achieve 24-hour uninterrupted processing without shutdown, meeting the continuous production requirements of the battery workshop. A desorption fan 7 provides airflow power for activated carbon desorption and regeneration, delivering desorption hot air.

[0033] The dual-function desorption heat exchanger 8 is used to recover the waste heat of high-temperature flue gas from catalytic combustion and preheat the desorbed fresh air and organic waste gas. The dual-function desorption heat exchanger 8 is equipped with independent, non-mixed, and non-directly contacting fresh air channels, waste gas channels, and flue gas channels. It utilizes the temperature difference between high-temperature flue gas and low-temperature gas to carry out indirect heat conduction and convection heat exchange. Heat transfer is achieved on the premise of ensuring that the gases do not mix. The room temperature fresh air and high-concentration waste gas can absorb the heat of high-temperature flue gas and rise in temperature, while the high-temperature flue gas cools down due to the release of heat, thus completing the waste heat recovery.

[0034] The catalytic combustion furnace 9 is used to catalytically oxidize and decompose high-concentration organic waste gas to achieve harmless treatment; the main fan 10 is used to provide negative pressure for the system, draw in the exhaust gas and transport the purified gas; the main chimney 11 is used to discharge the purified gas that meets the standards at high altitude.

[0035] In this embodiment, the input end of the static pressure box 1 is used to connect the exhaust gas to be treated, the output end of the static pressure box 1 is connected to the input end of the electrostatic oil mist processor 2, the output end of the electrostatic oil mist processor 2 is connected to the input end of the alkaline scrubbing tower 3, the output end of the alkaline scrubbing tower 3 is connected to the input end of the demister 4, the output end of the demister 4 is connected to the input ends of the first activated carbon adsorption bed 5 and the second activated carbon adsorption bed 6 respectively, the purification output ends of the first activated carbon adsorption bed 5 and the second activated carbon adsorption bed 6 are connected to the input end of the main fan 10, and the output end of the main fan 10 is connected to the main chimney 11;

[0036] The desorption output ends of the first activated carbon adsorption bed 5 and the second activated carbon adsorption bed 6 are connected to the exhaust gas input end of the dual-function desorption heat exchanger 8, and the exhaust gas output end of the dual-function desorption heat exchanger 8 is connected to the input end of the catalytic combustion furnace 9.

[0037] The output end of the catalytic combustion furnace 9 is connected to the flue gas input end of the dual-function desorption heat exchanger 8, and the flue gas output end of the dual-function desorption heat exchanger 8 is connected to the input end of the main blower 10.

[0038] The fresh air inlet of the dual-function desorption heat exchanger 8 is used to access fresh air from the outside, and the fresh air outlet is connected to the inlet of the desorption fan 7. The outlet of the desorption fan 7 is connected to the desorption inlet of the first activated carbon adsorption bed 5 and the second activated carbon adsorption bed 6, respectively.

[0039] The working principle and beneficial effects of this invention are as follows:

[0040] The exhaust gas to be treated enters the device from the input end of the static pressure box 1 under the negative pressure suction of the main fan 10. First, the static pressure box 1 completes the stabilization of flow, pressure equalization and airflow pulsation buffering to reduce the impact of airflow disturbance on downstream equipment. Then, the exhaust gas enters the electrostatic oil mist processor 2 to remove oil mist and liquid particles in the exhaust gas to prevent blockage of downstream pipeline equipment. Next, the exhaust gas enters the alkaline washing tower 3 made of PP / FRP anti-corrosion material, and comes into countercurrent contact with the alkaline washing liquid in the tower to efficiently remove strong acidic corrosive components such as HF and POF3 to prevent acidic gases from corroding system equipment. After that, the exhaust gas enters the demister 4 to remove mist droplets and water vapor entrained in the airflow to avoid water vapor reducing the adsorption performance of activated carbon.

[0041] After the clean airflow has completed the staged pretreatment, it enters the first activated carbon adsorption bed 5 or the second activated carbon adsorption bed 6. High-performance activated carbon deeply adsorbs VOCs, esters and organosilicon components in the exhaust gas to purify the airflow and achieve pollutant concentration and separation.

[0042] The purified clean gas is purified by the first activated carbon adsorption bed 5 or the second activated carbon adsorption bed 6, and then pressurized by the main fan 10 before being sent into the main chimney 11 to achieve high-altitude emission compliance. The main fan 10 is located at the rear end of the activated carbon adsorption bed, so that the front-end treatment units such as the static pressure box 1, the electrostatic oil mist processor 2, the alkaline washing tower 3, the demister box 4, and the activated carbon adsorption bed are in a negative pressure state throughout the process, eliminating the risk of harmful gas leakage.

[0043] This device adopts a parallel and alternating operation mode of two activated carbon adsorption beds. While one adsorption bed is performing adsorption and purification operations, the other adsorption bed is simultaneously undergoing desorption and regeneration, achieving 24-hour uninterrupted continuous operation. Specifically:

[0044] Outside fresh air enters the independent fresh air channel inside the dual-function desorption heat exchanger 8 through the fresh air inlet. This channel is isolated from the flue gas channel and does not mix with it.

[0045] At this time, high-temperature flue gas is already circulating in the flue gas passage. This high-temperature flue gas is generated and discharged after the high-concentration organic waste gas is catalytically oxidized by the catalytic combustion furnace 9. Fresh air undergoes indirect heat exchange with the high-temperature flue gas here. The purpose is to use the waste heat to preheat the fresh air to the temperature required for desorption, without the need for additional electric heating, thus reducing system energy consumption.

[0046] After preheating, the hot air is pressurized and transported by the desorption fan 7, and enters the first activated carbon adsorption bed 5 or the second activated carbon adsorption bed 6 in the regeneration state through the desorption pipeline. The hot air passes evenly through the activated carbon bed, fully desorbing and resolving organic pollutants such as VOCs, esters, and fluorosilanes adsorbed in the pores of the activated carbon. The purpose is to restore the adsorption performance of the activated carbon, realize its recycling, and form high-concentration organic waste gas.

[0047] The high-concentration organic waste gas enters the independent waste gas channel of the heat exchanger through the waste gas inlet of the dual-function desorption heat exchanger 8 after being desorbed from the first activated carbon adsorption bed 5 or the second activated carbon adsorption bed 6. This channel is also isolated from the flue gas channel.

[0048] The high-concentration waste gas absorbs heat from the high-temperature flue gas in the catalytic combustion furnace 9 again, raising its temperature to the catalyst ignition temperature. The purpose is to ensure that the waste gas meets the conditions for catalytic oxidation reaction and to guarantee the oxidation decomposition efficiency.

[0049] The heated high-concentration organic waste gas is sent to the catalytic combustion furnace 9 from the heat exchanger exhaust end. Under the action of the catalyst in the furnace, a flameless catalytic oxidation reaction occurs, and the organic pollutants are completely oxidized and decomposed into carbon dioxide and water. The purpose is to achieve the harmless treatment of organic waste gas and generate high-temperature clean flue gas.

[0050] The high-temperature clean flue gas is discharged from the outlet of the catalytic combustion furnace 9 and enters the flue gas input end of the dual-function desorption heat exchanger 8. It flows along the independent flue gas channel and exchanges heat in stages with the fresh air in the fresh air channel and the high-concentration waste gas in the waste gas channel. The purpose is to fully recover the heat carried by the high-temperature flue gas and use it to preheat the fresh air and waste gas, so as to realize the closed-loop recycling of waste heat.

[0051] After heat exchange, the low-temperature clean flue gas is discharged from the flue gas output end of the dual-function desorption heat exchanger 8, and then mixed with the main purified gas at the front end of the main fan 10 before being finally discharged. This device is equipped with a dual-function desorption heat exchanger 8, which uses the high-temperature flue gas generated by catalytic combustion to preheat the desorbed fresh air and high-concentration waste gas, realizing the closed-loop recycling of waste heat. No additional electric heating is required, which significantly reduces energy consumption and avoids energy waste.

[0052] In addition, this device features a static pressure box 1 at the system front end to stabilize, equalize, and buffer the flow of exhaust gas, optimizing the flow field, reducing airflow disturbance, and ensuring stable system operation with low flow resistance. The alkaline scrubbing tower 3 is made of PP / FRP corrosion-resistant material, capable of withstanding strong acidic corrosive gases such as HF and POF3, preventing equipment corrosion damage and extending service life. The device also employs a catalytic combustion furnace 9 to perform flameless catalytic oxidation decomposition of high-concentration organic waste gas and combustible components generated during desorption, ensuring thorough harmlessness, no open flame, and high safety. Simultaneously, the system uses a negative pressure system after the main fan 10 to prevent harmful gas leakage and improve overall safety performance.

[0053] In summary, this device integrates multi-stage treatment including oil mist removal, alkaline washing and acid removal, water removal, adsorption, and catalytic combustion. It can simultaneously remove VOCs, esters, fluorosilanes, acidic gases, oil mist, and combustible gases, achieving thorough purification and meeting the requirements for online environmental monitoring and emission compliance.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery workshop exhaust gas treatment device, characterized in that, The system includes a static pressure chamber (1), an electrostatic oil mist processor (2), an alkaline washing tower (3), a demister (4), a first activated carbon adsorption bed (5), a second activated carbon adsorption bed (6), a desorption fan (7), a dual-function desorption heat exchanger (8), a catalytic combustion furnace (9), a main fan (10), and a main chimney (11). The static pressure chamber (1), the electrostatic oil mist processor (2), the alkaline washing tower (3), and the demister (4) are connected in sequence. The first activated carbon adsorption bed (5) and the second activated carbon adsorption bed (6) are connected in parallel at the output end of the demister (4). The dual-function desorption heat exchanger (8), the catalytic combustion furnace (9), and the first activated carbon adsorption bed (5) and the second activated carbon adsorption bed (6) form a desorption regeneration loop.

2. The battery workshop exhaust gas treatment device according to claim 1, characterized in that, The output end of the static pressure box (1) is connected to the input end of the electrostatic oil mist processor (2), the output end of the electrostatic oil mist processor (2) is connected to the input end of the alkaline washing tower (3), and the output end of the alkaline washing tower (3) is connected to the input end of the demister (4).

3. The battery workshop exhaust gas treatment device according to claim 1, characterized in that, The purification output ends of the first activated carbon adsorption bed (5) and the second activated carbon adsorption bed (6) are connected to the input end of the main fan (10), and the output end of the main fan (10) is connected to the main chimney (11).

4. The battery workshop exhaust gas treatment device according to claim 1, characterized in that, The dual-function desorption heat exchanger (8) is internally equipped with a fresh air passage, an exhaust gas passage, and a flue gas passage that are independent of each other, do not mix, and do not come into direct contact.

5. The battery workshop exhaust gas treatment device according to claim 4, characterized in that, The desorption output ends of the first activated carbon adsorption bed (5) and the second activated carbon adsorption bed (6) are connected to the exhaust gas input end of the dual-function desorption heat exchanger (8), and the exhaust gas output end of the dual-function desorption heat exchanger (8) is connected to the input end of the catalytic combustion furnace (9).

6. The battery workshop exhaust gas treatment device according to claim 5, characterized in that, The output end of the catalytic combustion furnace (9) is connected to the flue gas input end of the dual-function desorption heat exchanger (8), and the flue gas output end of the dual-function desorption heat exchanger (8) is connected to the input end of the main fan (10).

7. The battery workshop exhaust gas treatment device according to claim 6, characterized in that, The fresh air output end of the dual-function desorption heat exchanger (8) is connected to the input end of the desorption fan (7), and the output end of the desorption fan (7) is connected to the desorption input ends of the first activated carbon adsorption bed (5) and the second activated carbon adsorption bed (6), respectively.

8. The battery workshop exhaust gas treatment device according to claim 1, characterized in that, The alkaline washing tower (3) is made of PP / FRP anti-corrosion material.

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