CN212166958U - Pretreatment device for dichloromethane waste gas recovery - Google Patents
Pretreatment device for dichloromethane waste gas recovery Download PDFInfo
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- CN212166958U CN212166958U CN201922083832.5U CN201922083832U CN212166958U CN 212166958 U CN212166958 U CN 212166958U CN 201922083832 U CN201922083832 U CN 201922083832U CN 212166958 U CN212166958 U CN 212166958U
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Abstract
The utility model relates to a pretreatment device for recycling dichloromethane waste gas, which is characterized by comprising a drying box, an exhaust fan, a condensing device and a liquid storage tank; one end of the exhaust fan is communicated with the drying box, the other end of the exhaust fan is communicated with an air inlet pipe of the condensing device, and a liquid discharge pipe of the condensing device is communicated with a liquid storage tank liquid inlet. The utility model discloses use the dichloromethane waste gas of second grade condensation in to the drying cabinet to carry out the condensation preliminary treatment, reduce the dichloromethane concentration that gets into the active carbon adsorption processing system to the absorption cycle of extension active carbon adsorption recovery processing device reduces and adsorbs/desorption cycle number, prolongs the life of adsorbing material, reduces desorption steam energy consumption.
Description
Technical Field
The utility model belongs to the technical field of waste gas recovery administers technique and specifically relates to a dichloromethane waste gas recovery's preprocessing device.
Background
At present, the preparation process of the lithium ion battery diaphragm mainly comprises two steps: dry processes (uniaxial and biaxial stretching) and wet processes (thermally induced phase separation). In the wet process production process, a solvent (paraffin oil) with a high boiling point and low volatility is used as a pore-forming agent, the solvent with a low boiling point and low volatility is used for eluting the pore-forming agent in the extraction process, and the extractant on the surface of the diaphragm and in the micropores is volatilized through the drying process and enters a waste gas treatment system until the concentration of waste gas reaches the national emission standard. At present, the commonly used extracting agents comprise hexane, heptane, acetone, dichloromethane and other volatile organic solvents, wherein dichloromethane is most widely applied due to the characteristics of nonflammability, nonflammability and small harm to human bodies.
In organic waste gas treatment, generally used purification methods include combustion, adsorption, absorption, and the like. The combustion method is a treatment method for accelerating the chemical reaction of volatile organic solvents by selecting a proper catalyst to finally reduce the concentration of organic matters, so that the organic matters are no longer harmful, but chlorine-containing compounds generated by treating dichloromethane waste gas can cause secondary pollution and waste of raw materials; the absorption method generally adopts ethanol, diethyl ether and benzene as an absorbent, the absorbent is volatile at normal temperature and is easily taken away by gas to generate new pollution, and the recovered materials cannot be directly recycled and reused and can be recycled after subsequent rectification and purification.
Currently, the most common method for methylene chloride waste gas treatment is an adsorption method: and (2) feeding the dichloromethane waste gas with high concentration into an adsorption box body, absorbing the dichloromethane by an activated carbon fiber adsorption material, desorbing by using water vapor after the adsorption material is saturated, condensing to obtain recovered liquid dichloromethane, and regenerating the adsorption material for recycling. In the desorption process, water vapor is needed, so that the recovery energy consumption cost is high; in addition, the treatment capacity of a single set of equipment is limited, the adsorbing materials have certain service life, in order to ensure the adsorbing effect and meet the emission standard, the adsorbing materials need to be frequently replaced (the engineering quantity is large), and the time cost and the material cost are high. For high-concentration dichloromethane, a plurality of sets of activated carbon fiber adsorption treatment systems are required to be added for parallel treatment, and the whole equipment is large and the investment cost is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a dichloromethane waste gas recovery's preprocessing device. The dichloromethane waste gas in the drying box is subjected to condensation pretreatment by using secondary condensation, the dichloromethane concentration entering an activated carbon adsorption treatment system is reduced, the service life of subsequent adsorption materials is prolonged, a plurality of sets of activated carbon fiber adsorption equipment are not required to be adopted for parallel treatment, and the equipment investment cost is low. The energy consumption is reduced through the heat recovery system, and the whole compact of equipment occupies little space. Solves the technical problems of large energy consumption, high cost, large equipment volume and high investment cost of methylene dichloride waste gas absorption and recovery of activated carbon fibers in the prior art.
The purpose of the utility model is realized through the following technical scheme:
a pretreatment device for recycling dichloromethane waste gas comprises a drying box, an exhaust fan, a condensing device and a liquid storage tank; one end of the exhaust fan is communicated with the drying box, the other end of the exhaust fan is communicated with an air inlet pipe of the condensing device, and a liquid discharge pipe of the condensing device is communicated with a liquid storage tank liquid inlet.
The drying box is used for heating and drying the extracted diaphragm,
the condensing device is of a box structure, air is fed from the left side, exhausted from the right side, an air inlet and an air outlet are reserved at the top, and a condensation discharge port is reserved at the bottom.
A heat pipe heat exchanger is arranged in the condensing device and is used as a regenerative system and a chilled water circulating pipe is used as a cryogenic system;
chilled water is arranged in the chilled water circulating pipe;
one side of the condensing device is provided with a water inlet and a water outlet of a chilled water circulating pipe;
the water inlet of the chilled water circulating pipe is connected with the refrigerating unit, the refrigerating unit is connected with the water outlet of the chilled water circulating pipe, and chilled water circularly flows through the chilled water circulating pipe in the condensing device so that waste gas in the condensing device keeps low temperature and can be condensed.
Further, the heat pipes in the heat pipe exchanger are arranged obliquely, and the inclination angle is preferably selected to be 15 °.
Furthermore, the medium in the heat pipe of the heat pipe exchanger is an environment-friendly refrigerant, and preferably water in a vacuum state is selected as the refrigerant; the refrigerant is circulated in a closed circuit within the heat pipe.
Further, the cold quantity of the treated waste gas is recovered through the condensation of a refrigerant on the right side of the heat pipe heat exchanger; and the dichloromethane waste gas is precooled by evaporating the refrigerant on the left side of the heat pipe exchanger.
Further, condensing equipment still includes the demister, and the demister passes through the sealing washer etc. and welds in the box.
The height of a connecting port of the exhaust fan and the drying box is lower than half of the height of the drying box.
The equipment and the pipeline thereof are made of 316L corrosion-resistant stainless steel.
And a liquid discharge pipe of the condensing device is communicated with the liquid storage tank, and a connecting pipeline of the condensing device comprises the liquid discharge pipe and the highest point of the liquid storage tank does not exceed the bottom of the condensing device.
Further, a liquid discharge pipe of the condensing device is connected with a connecting pipeline of the liquid storage tank, the condensing device and the liquid storage tank for cold insulation treatment.
Compared with the prior art, the utility model has the positive effects that:
the utility model provides a preprocessing device of dichloromethane waste gas recovery, the drying cabinet is used for heating and drying the diaphragm after the extraction, the right-hand member and the drying cabinet intercommunication of air exhauster, the other end of air exhauster and condensing equipment's intake pipe intercommunication for make the interior negative pressure that forms of drying cabinet, and pass through the air exhauster with the dichloromethane waste gas in the drying cabinet and carry condensing equipment in. The liquid discharge pipe of the condensing device is communicated with the liquid storage tank, the condensing device is in secondary condensation, the first stage is a heat return system, and the second stage is a deep cooling system; dichloromethane waste gas in the drying cabinet conveyed by the exhaust fan is condensed in a second stage to a condensing device, condensate is discharged to a liquid storage tank through a liquid discharge pipe of the condensing device, and then dichloromethane is conveyed to a dichloromethane storage tank. The non-condensable gas passes through a demister in the condensing device, is recovered by a heat recovery system, and is conveyed from an exhaust pipe of the condensing device to a subsequent activated carbon fiber adsorption device for reprocessing. The utility model discloses use the dichloromethane waste gas of second grade condensation in to the drying cabinet to carry out the condensation preliminary treatment, reduce the dichloromethane concentration that gets into the active carbon adsorption processing system to the absorption cycle of extension active carbon adsorption recovery processing device reduces and adsorbs/desorption cycle number, prolongs the life of adsorbing material, reduces desorption steam energy consumption.
Drawings
Fig. 1 is a schematic structural diagram of the present application.
The labels in the figures are:
1, a drying box;
2, an exhaust fan;
3 exhaust port/exhaust pipe;
4 air inlet/air inlet pipe;
5, a heat pipe heat exchanger;
6 a condensing device;
7 a chilled water circulating pipe;
8, a water inlet and a water outlet of the chilled water circulating pipe;
9 rows of condensation ports/drainage pipes;
10 liquid storage tank;
11 a demister.
Detailed Description
The following provides the utility model relates to a preprocessing device's of dichloromethane waste gas recovery concrete implementation mode.
Example 1
A pretreatment device for recycling dichloromethane waste gas comprises a drying box 1, an exhaust fan 2, a condensing device 6 and a liquid storage tank 10; the drying box 1 is used for heating and drying the extracted diaphragm, one end of the exhaust fan 2 is communicated with the drying box 1, the other end of the exhaust fan 2 is communicated with the air inlet pipe 4 of the condensing device 6, and the liquid discharge pipe 9 of the condensing device 6 is communicated with the liquid inlet of the liquid storage tank 10;
the right end of the exhaust fan 2 is communicated with the drying oven 1, and the other end of the exhaust fan 2 is communicated with the air inlet pipe 4 of the condensing device 6, so that negative pressure is formed in the drying oven 1, and dichloromethane waste gas in the drying oven 1 is conveyed into the condensing device 6 through the exhaust fan 2. The exhaust fan 2 is controlled by a frequency converter and can be adjusted according to specific production conditions.
The condensing device 6 is of a box structure, air is fed from the left side and exhausted from the right side, an air inlet 4 and an air outlet 3 are reserved at the top, and a condensation discharge port 9 is reserved at the bottom. A heat pipe heat exchanger 5 serving as a regenerative system and a chilled water circulating pipe 7 serving as a cryogenic system are arranged in the condensing device 6;
further, the chilled water is arranged in the chilled water circulating pipe 7, a chilled water circulating pipe water inlet and a chilled water circulating pipe water outlet 8 are arranged on one side of the condensing device 6, the chilled water circulating pipe water inlet is connected with the refrigerating unit, the refrigerating unit is connected with the chilled water circulating pipe water outlet, and the chilled water circularly flows through the chilled water circulating pipe 7 in the condensing device 6 to enable the waste gas in the condensing device 6 to keep low temperature and be condensed.
Further, the heat pipes in the heat pipe exchanger 5 are arranged obliquely, preferably the angle of inclination is selected to be 15 °.
Further, the medium in the heat pipe of the heat pipe exchanger 5 is an environment-friendly refrigerant, and preferably, water in a vacuum state is selected as the refrigerant. The refrigerant is circulated in a closed circuit within the heat pipe.
Further, the right side of the heat pipe heat exchanger 5 recovers the cold energy of the treated waste gas through refrigerant condensation. And the dichloromethane waste gas is precooled on the left side of the heat pipe exchanger 5 through evaporation of the refrigerant.
It should be noted that the liquid discharge pipe 9 of the condensing device 6 is communicated with the liquid storage tank 10, the condensing device 6 is a secondary condensing system, the primary condensing system is a heat return system provided with a heat pipe exchanger 5, the temperature is about 3 ℃, the secondary condensing system is a cryogenic system provided with a chilled water circulating pipe 7, and the temperature is about-40 ℃; the dichloromethane waste gas in the drying box 1 conveyed by the exhaust fan 2 is subjected to secondary condensation in the condensing device 6, condensate is discharged to a liquid storage tank 10 through a liquid discharge pipe 9 of the condensing device 6, and then the dichloromethane is conveyed to a dichloromethane storage tank.
Further, the condensation device 6 further comprises a demister 11. The non-condensable gas passes through a demister 11 in the condensing device 6, then the cold energy is recovered through a heat recovery system, and then the non-condensable gas is conveyed from an exhaust pipe 3 of the condensing device 6 to a subsequent activated carbon fiber adsorption device for reprocessing. This application uses the second grade condensation to carry out condensation preliminary treatment to the dichloromethane waste gas in the drying cabinet 1, reduces the dichloromethane concentration that gets into the active carbon adsorption processing system to the absorption cycle of extension active carbon adsorption recovery processing apparatus reduces the absorption/desorption cycle number, and the life of extension adsorbing material reduces desorption steam energy consumption.
The height of a connecting port of the exhaust fan 2 and the drying box 1 is lower than half of the height of the drying box. The connection port of the exhaust fan 2 and the left end of the drying oven 1 is arranged at the middle lower side of the drying oven 1, so that the exhaust fan 2 can thoroughly convey the volatilized dichloromethane in the drying oven 1 into the condensing device 6.
And a liquid discharge pipe 9 of the condensing device 6 is communicated with the liquid storage tank 10, and the connecting pipeline comprises the liquid discharge pipe 9 and the highest point of the liquid storage tank 10 and cannot exceed the bottom of the condensing device 6. Ensuring that the dichloromethane located within the condensing means 6 is thoroughly transported into the reservoir 10.
The equipment and the pipeline thereof are made of 316L corrosion-resistant stainless steel. And a connecting pipeline between a liquid discharge pipe 9 of the condensing device 6 and the liquid storage tank 10, the condensing device 6 and the liquid storage tank 10 are subjected to cold insulation treatment.
The method is technically characterized in that compared with a common pretreatment device for recovering dichloromethane waste gas, chilled water is used for condensation, and a heat pipe heat exchanger is used for recovering cold, so that the condensation effect is greatly improved, energy is saved, and the recovered dichloromethane can directly supplement volatilization loss in the extraction process; the concentration of the pretreated waste gas is greatly reduced, the steam consumption of the dichloromethane active carbon adsorption recovery processing device is reduced, the energy consumption cost is reduced, and the service cycle of the adsorption material is prolonged. The whole equipment is centralized, the occupied space is small, and the equipment investment is low.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the concept of the present invention, and these improvements and decorations should also be considered as within the protection scope of the present invention.
Claims (10)
1. A pretreatment device for recycling dichloromethane waste gas is characterized by comprising a drying box, an exhaust fan, a condensing device and a liquid storage tank; one end of the exhaust fan is communicated with the drying box, the other end of the exhaust fan is communicated with an air inlet pipe of the condensing device, and a liquid discharge pipe of the condensing device is communicated with a liquid storage tank liquid inlet.
2. The pretreatment device for dichloromethane waste gas recovery according to claim 1, wherein the condensing device is a box structure, the left side is used for air intake, the right side is used for air exhaust, the top is provided with an air inlet and an air outlet, and the bottom is provided with a condensation outlet;
a heat pipe heat exchanger is arranged in the condensing device and is used as a regenerative system and a chilled water circulating pipe is used as a cryogenic system;
one side of the condensing device is provided with a chilled water circulating pipe water inlet and a chilled water circulating pipe water outlet.
3. The pretreatment device for recovering dichloromethane exhaust gas according to claim 2, wherein the chilled water circulation pipe is internally provided with chilled water.
4. The pretreatment device for dichloromethane waste gas recovery according to claim 2, wherein the inlet of the chilled water circulation pipe is connected to a freezing unit, the freezing unit is connected to the outlet of the chilled water circulation pipe, and the chilled water circulates through the chilled water circulation pipe in the condensing device to keep the temperature of the waste gas in the condensing device low and condense the waste gas.
5. The pretreatment device for methylene dichloride waste gas recovery according to claim 2, further comprising a heat pipe in the heat pipe exchanger is arranged obliquely, and the inclination angle is selected to be 15 °.
6. The pretreatment device for dichloromethane waste gas recovery according to claim 2, wherein the medium in the heat pipe of the heat pipe exchanger is an environment-friendly refrigerant.
7. The pretreatment device for dichloromethane waste gas recovery according to claim 2, wherein the right side of the heat pipe exchanger recovers the cold energy of the treated waste gas by refrigerant condensation; and the dichloromethane waste gas is precooled by evaporating the refrigerant on the left side of the heat pipe exchanger.
8. The pretreatment device for recovering dichloromethane waste gas according to claim 1, wherein the height of the connection port of the exhaust fan and the drying oven is less than half of the height of the drying oven.
9. The pretreatment device for dichloromethane waste gas recovery according to claim 1, wherein the liquid discharge pipe of the condensing device is communicated with the liquid storage tank, the connecting pipeline comprises the liquid discharge pipe, and the highest point of the liquid storage tank does not exceed the bottom of the condensing device.
10. The pretreatment device for recovering dichloromethane waste gas according to claim 1, wherein a liquid discharge pipe of the condensing device is connected with the connecting pipeline of the liquid storage tank, the condensing device and the liquid storage tank for cold insulation treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922083832.5U CN212166958U (en) | 2019-11-28 | 2019-11-28 | Pretreatment device for dichloromethane waste gas recovery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922083832.5U CN212166958U (en) | 2019-11-28 | 2019-11-28 | Pretreatment device for dichloromethane waste gas recovery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113731100A (en) * | 2021-09-30 | 2021-12-03 | 深圳市环境工程科学技术中心有限公司 | Dichloromethane waste gas treatment method and system |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113731100A (en) * | 2021-09-30 | 2021-12-03 | 深圳市环境工程科学技术中心有限公司 | Dichloromethane waste gas treatment method and system |
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