Casting solvent catcher

Abstract

The invention provides a tape casting solvent catcher which comprises a rack, a refrigerating system is arranged on the rack and comprises an evaporator, a steam inlet is formed in the evaporator and communicated with a waste gas header pipe in the tape casting process, and the two output ends of the evaporator are communicated with a filter and a purified liquid storage device respectively. Condensable gas in the waste gas is condensed into liquid to enter the purified liquid storage device, an air exhaust port is formed in the filter, and non-condensable gas in the waste gas enters the filter to be filtered and then is exhausted through the air exhaust port. According to the invention, the organic solvent in the waste gas of the tape casting process can be effectively recovered, the condensable organic solvent is condensed into liquid, the liquid is stored in the purified liquid storage device and finally discharged back to the tape casting equipment storage tank, so that the solvent is recycled, the loss of the solvent is reduced, the raw material cost of an enterprise is reduced, and the economic benefit of the enterprise is improved.

Description

Technical Field

[0001] The invention mainly relates to the technical field of tape casting process, and in particular to a tape casting solvent catcher. Background Art

[0002] At present, in the field of tape casting process (such as the tape casting process of alumina or aluminum nitride), the conventional waste gas treatment mode is that each exhaust section first converges to a centralized waste gas main, and then the waste gas is transported to the waste gas treatment center established in the factory through a pipeline. After undergoing washing and adsorption operations, it is further dried and finally enters the RTO (regenerative thermal oxidizer) for incineration treatment.

[0003] However, for those relatively small-scale cast film equipment companies with less equipment exhaust volume, this centralized waste gas treatment model has many disadvantages. The equipment required for centralized waste gas treatment is large in scale, and in terms of equipment composition, it involves complex devices such as energy washing, adsorption, and RTO. During the operation of these devices, not only are the operating cycles short, but the adsorption materials need to be replaced frequently, and the RTO equipment requires a continuous supply of auxiliary fuel during operation. The above factors have led to high operating costs for enterprises in the waste gas treatment link, which has brought a heavy economic burden to the production and operation of the enterprises and greatly restricted the development of the enterprises. Summary of the invention

[0004] 1. Technical problem to be solved by the invention: The present invention provides a casting solvent catcher to solve the technical problems existing in the above-mentioned background technology.

[0005] 2. Technical solution: To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a casting solvent capture device, comprising a frame, a refrigeration system is arranged on the frame, the refrigeration system comprises an evaporator, a steam inlet is arranged on the evaporator, the steam inlet is connected with the exhaust gas main pipe in the casting process, the two output ends of the evaporator are respectively connected with the filter and the purified liquid storage device, the condensable gas in the exhaust gas is condensed into liquid and enters the purified liquid storage device, the filter is provided with an air outlet, the non-condensable gas in the exhaust gas enters the filter, is filtered and then discharged through the air outlet.

[0006] Preferably, the refrigeration system also includes a compressor, an oil separator, a condenser, a drying filter, a refrigerant liquid reservoir, an electronic expansion valve and an evaporator. The outlet of the compressor is connected to the inlet of the oil separator, the outlet of the oil separator is connected to the condenser, the outlet of the condenser is connected to the drying filter, the refrigerant liquid reservoir and the electronic expansion valve in sequence, the outlet of the electronic expansion valve is connected to the evaporator, and the outlet of the evaporator is connected to the inlet of the compressor to form a closed circulation system.

[0007] Preferably, a fan is provided on the top of the frame, the fan is arranged above the condenser, and an air inlet of the fan is close to the condenser.

[0008] Preferably, a liquid level meter is provided in the purified liquid storage device, and the output end of the purified liquid storage device is connected to the storage tank of the casting equipment. When the purified liquid storage device is full, the liquid is automatically discharged into the storage tank of the casting equipment. The purified liquid storage device generates an air seal by air pressure to prevent secondary volatilization of the condensed liquid.

[0009] 3. Beneficial effects: Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention can effectively recover organic solvents in waste gas from the casting process, condense condensable organic solvents into liquids and store them in a purified liquid storage device, and finally discharge them back to the storage tank of the casting equipment, thereby realizing the recovery and reuse of solvents, reducing the loss of solvents, and reducing the raw material costs of enterprises. The recovery and reuse of solvents directly reduces the cost of enterprises to purchase new solvents, which saves enterprises a lot of money in the long run. Compared with the traditional centralized waste gas treatment method, the casting solvent capture device does not require large equipment and frequent replacement of adsorption materials and auxiliary fuels, which significantly reduces equipment investment, operation and maintenance costs, and improves the economic benefits of enterprises.

[0010] The present invention effectively reduces the emission of organic solvents and other harmful substances in the exhaust gas by condensing and recovering the condensable gas in the exhaust gas and filtering and purifying the non-condensable gas, greatly reduces the pollution to the atmospheric environment, and helps to improve the regional air quality.

[0011] The purified liquid storage device of the present invention is provided with a liquid level gauge, which can automatically monitor the liquid level and automatically discharge it into the storage tank of the casting equipment when it is full. The air seal is generated by air pressure to prevent the secondary volatilization of the condensed liquid, thereby reducing manual operation and solvent volatilization losses. At the same time, the overall structure of the equipment is stable, and the various components work well together, which reduces the probability of failure and ensures long-term stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 It is a schematic diagram of the external structure of the present invention; Figure 4 This is a schematic diagram of the external structure of the present invention from another angle.

[0013] Reference numerals: 1. Frame; 2. Condenser; 3. Fan; 4. Filter; 5. Air outlet; 6. Dry filter; 7. Evaporator; 8. Steam inlet; 9. Compressor; 10. Purified liquid storage; 11. Oil separator; 12. Electronic expansion valve; 13. Refrigerant liquid storage tank. DETAILED DESCRIPTION

[0014] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0016] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0017] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] It should be noted that the structures not introduced in the present invention are the same as the prior art or can be implemented by using the prior art, and are not described in detail here because they do not involve the design points and improvement directions of the present invention. Example

[0019] Refer to the attached Figures 1 to 4A casting solvent capture device comprises a frame 1, on which a refrigeration system is arranged, the refrigeration system comprises an evaporator 7, on which a steam inlet 8 is arranged, the steam inlet 8 is connected to the exhaust gas main pipe in the casting process, and two output ends of the evaporator 7 are respectively connected to a filter 4 and a purified liquid storage device 10, the condensable gas in the exhaust gas is condensed into liquid and enters the purified liquid storage device 10, the filter 4 is provided with an air outlet 5, and the non-condensable gas in the exhaust gas enters the filter 4 and is filtered and then discharged through the air outlet 5.

[0020] The refrigeration system also includes a compressor 9, an oil separator 11, a condenser 2, a drying filter 6, a refrigerant liquid reservoir 13, an electronic expansion valve 12 and an evaporator 7. The outlet of the compressor 9 is connected to the inlet of the oil separator 11, the outlet of the oil separator 11 is connected to the condenser 2, the outlet of the condenser 2 is connected to the drying filter 6, the refrigerant liquid reservoir 13, and the electronic expansion valve 12 in sequence, the outlet of the electronic expansion valve 12 is connected to the evaporator 7, and the outlet of the evaporator 7 is connected to the inlet of the compressor 9 to form a closed circulation system.

[0021] A fan 3 is arranged on the top of the rack 1 . The fan 3 is arranged above the condenser 2 , and an air inlet of the fan 3 is close to the condenser 2 .

[0022] A liquid level meter is provided in the purified liquid storage 10, and the output end of the purified liquid storage 10 is connected to the storage tank of the casting equipment. When the purified liquid storage 10 is full, it is automatically discharged into the storage tank of the casting equipment. The purified liquid storage 10 generates an air seal through air pressure to prevent the condensed liquid from volatilizing again.

[0023] Working principle: The waste gas generated in the casting process enters the steam inlet 8 of the evaporator 7 through the waste gas main pipe. The waste gas contains organic solvent vapor. At this time, the refrigeration system starts to work, and the compressor 9 sucks in the low-temperature and low-pressure refrigerant gas and compresses it into high-temperature and high-pressure gas, which is discharged into the oil separator 11 to separate the lubricating oil and then enters the condenser 2. In the condenser 2, under the action of the fan 3, the refrigerant gas exchanges heat with the outside air and is cooled and liquefied, and then passes through the drying filter 6 to remove moisture impurities, the refrigerant liquid storage 13 for storage and regulation, and the electronic expansion valve 12 for throttling and pressure reduction, and becomes a low-temperature and low-pressure refrigerant liquid mixture that enters the evaporator tube of the evaporator 7.

[0024] The absorption tube inside the evaporator 7 and the cold plate outside the discharge tube transfer heat to the refrigerant in the tube by heat conduction and convection. After the refrigerant in the tube absorbs the heat of the organic solvent vapor, it will evaporate and absorb the heat energy of the surrounding environment, thereby achieving vaporization. In this process, the organic solvent vapor outside the tube is constantly captured and liquefied, and small droplets are separated and finally become a large liquid mass. Under the action of external pressure and gravity and the internal structure design of the evaporator 7, the liquid condensable is separated from the non-condensable gas, and then the liquid flows into the purified liquid storage 10 through the confluence pipe. At the same time, a small amount of low-boiling condensed vapor (including non-condensable gas and a small amount of incompletely condensed condensable gas) flows to the other output end of the evaporator 7 and enters the filter 4.

[0025] In the filter 4, the adsorption material can effectively adsorb the condensable vapors that have not been captured and not completely condensed, and further separate the air. The small amount of residual liquid condensables will gather on the surface or inside the filter element to form droplets and flow downward along the filter element under the action of gravity, and finally gather in the liquid collection area at the bottom of the filter 4. After the liquid is collected, it can also enter the recovery tank and other subsequent treatments, and the purified non-condensable gas is discharged from the air outlet 5.

[0026] After the liquid condensable material enters the recovery tank, air pressure is used to create an air seal to prevent the condensed liquid from volatilizing again. In the purified liquid storage 10, the liquid level meter monitors the liquid level in real time. When the liquid level reaches the set height and the purified liquid storage 10 is full, the liquid is automatically discharged into the storage tank of the casting equipment.

[0027] The collector can effectively recover organic solvents in the waste gas of the casting process, condense the condensable organic solvent into liquid and store it in the purified liquid storage 10, and finally discharge it back to the storage tank of the casting equipment, so as to realize the recovery and reuse of the solvent, reduce the loss of solvent and reduce the raw material cost of the enterprise.

[0028] By condensing and recovering the condensable gas in the exhaust gas and filtering and purifying the non-condensable gas, the emission of harmful substances in the exhaust gas is greatly reduced, the pollution to the environment is reduced, and environmental protection requirements are met.

[0029] Compared with the traditional centralized waste gas treatment method, for small cast film equipment companies, the catcher does not require huge centralized waste gas treatment equipment, frequent replacement of adsorption materials and use of auxiliary fuels, which reduces the company's equipment investment, operation and maintenance costs in waste gas treatment and improves the company's economic benefits.

[0030] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A casting solvent catcher, comprising a frame (1), characterized in that: The frame (1) is provided with a refrigeration system, the refrigeration system comprising an evaporator (7), the evaporator (7) is provided with a steam inlet (8), the steam inlet (8) is connected to the exhaust gas main pipe in the casting process, the two output ends of the evaporator (7) are respectively connected to the filter (4) and the purified liquid storage (10), the condensable gas in the exhaust gas is condensed into liquid and enters the purified liquid storage (10), the filter (4) is provided with an air outlet (5), the non-condensable gas in the exhaust gas enters the filter (4), is filtered and then discharged through the air outlet (5).

2. A casting solvent catcher according to claim 1, characterized in that: The refrigeration system further comprises a compressor (9), an oil separator (11), a condenser (2), a drying filter (6), a refrigerant liquid storage tank (13), an electronic expansion valve (12) and an evaporator (7); the outlet of the compressor (9) is connected to the inlet of the oil separator (11); the outlet of the oil separator (11) is connected to the condenser (2); the outlet of the condenser (2) is connected to the drying filter (6), the refrigerant liquid storage tank (13) and the electronic expansion valve (12) in sequence; the outlet of the electronic expansion valve (12) is connected to the evaporator (7); and the outlet of the evaporator (7) is connected to the inlet of the compressor (9), thereby forming a closed circulation system.

3. A casting solvent catcher according to claim 2, characterized in that: A fan (3) is arranged on the top of the frame (1); the fan (3) is arranged above the condenser (2); and an air inlet of the fan (3) is close to the condenser (2).

4. The casting solvent catcher according to claim 1, characterized in that: A liquid level meter is provided in the purified liquid storage (10); an output end of the purified liquid storage (10) is connected to a storage tank of the casting equipment; when the purified liquid storage (10) is full, the purified liquid storage (10) is automatically discharged into the storage tank of the casting equipment; and an air seal is generated in the purified liquid storage (10) by air pressure to prevent secondary volatilization of the condensed liquid.

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