Secondary refrigerant dehydration device for new energy refrigeration station

Abstract

The utility model relates to the technical field of lithium hexafluorophosphate preparation, and particularly discloses a new energy refrigeration station secondary refrigerant dehydration device which comprises a supply path and a loop of a refrigeration unit evaporator, the supply path and the loop are communicated with a water removal circulation loop, and the water removal circulation loop is provided with a basket type filter, a material guide tank and a circulation pump. And the basket type filter, the material guide tank and the circulating pump are sequentially communicated in the direction from the supply path to the loop. Through cooperative operation of a basket type filter, a material guide tank and a circulating pump on the water removal circulation loop, water contained in the evaporator of the refrigerating unit is removed, the evaporator of the refrigerating unit does not need to stop working during dehydration, and it is guaranteed that production is not affected by equipment failures.

Description

Technical Field

[0001] This utility model relates to the field of lithium hexafluorophosphate preparation technology, specifically to a dehydration device for a refrigerant in a new energy refrigeration station. Background Technology

[0002] Lithium hexafluorophosphate (LiPF6) is a key component of the electrolyte material in lithium-ion batteries. It plays a crucial role in conducting lithium ions and is an indispensable ingredient in power batteries. With the rapid development of new energy electric vehicles, the demand for lithium hexafluorophosphate is increasing significantly.

[0003] The production of lithium hexafluorophosphate involves a crystallization process, which precipitates the solute from the solution in crystal form. This process requires a -80°C low-temperature refrigerant with a supply and return temperature of -80°C / -75°C. The refrigerant medium is dichloromethane, and the refrigeration station uses a direct expansion cascade refrigeration unit. This unit's -80°C low-temperature system is equipped with a total of 8 sets (7 operating, 1 standby) of refrigeration units (evaporator + condenser), with one evaporator and one condenser in a one-to-one correspondence. The supply and return temperature of the refrigerant dichloromethane is -80 / -75℃, and the refrigerant is Freon (R22). During the production process, air or water molecules inevitably enter the system. Since dichloromethane is insoluble in water, the system circulates the water-containing dichloromethane to the evaporator of the refrigeration unit. When the water molecules encounter the low-temperature heat exchange wall, they immediately freeze and adhere to the inner wall of the evaporator. As the production cycle lengthens, an ice film will form on the inner wall of the evaporator, preventing the refrigerant (R22) in the condenser from transferring more cooling capacity to the refrigerant dichloromethane. Both the refrigerant system and the refrigerant system heat up, leading to equipment failure and shutdown. Utility Model Content

[0004] The purpose of this invention is to provide a refrigerant dehydration device for a new energy refrigeration station to solve the problem of air or water molecules entering the refrigeration system, causing ice to form on the inner wall of the evaporator.

[0005] To solve the above-mentioned technical problems, the following technical solution is provided:

[0006] A refrigerant dehydration device for a new energy refrigeration station includes a supply line and a circuit for the evaporator of a refrigeration unit. A dehydration circulation circuit is connected to the supply line and the circuit. The dehydration circulation circuit is equipped with a basket filter, a feed tank, and a circulation pump. The basket filter, the feed tank, and the circulation pump are connected sequentially from the supply line to the circuit. The basket filter includes a tank containing 4A molecular sieves. The inlet of the tank is connected to the supply line of the evaporator of the refrigeration unit through a pipe. The outlet of the tank is connected to the inlet of the feed tank through a pipe. The outlet of the feed tank is connected to the inlet of the circulation pump through a pipe. The outlet of the circulation pump is connected to the circuit of the evaporator of the refrigeration unit through a pipe. Each of the supply line, the circuit, and the dehydration circulation circuit is equipped with a valve.

[0007] The basic principle of the above technical solution is as follows: During dehydration, the feed tank is pre-filled with anhydrous dichloromethane. The circulation pump is turned on to replace the anhydrous dichloromethane with the dichloromethane in the evaporator of the refrigeration unit. The ice adhering to the inner wall of the evaporator melts into water when it meets room temperature. The dichloromethane containing water flows through the supply line to the dehydration circulation loop and is circulated through the system to the basket filter. The dry 4A molecular sieve in the basket filter adsorbs the water contained in the dichloromethane, thereby obtaining anhydrous dichloromethane. The anhydrous dichloromethane is then transferred to the feed tank for recycling by the circulation pump, thus achieving the purpose of dehydrating the system.

[0008] The beneficial effects of the above technical solution are as follows:

[0009] By using a basket filter, feed tank, and circulating pump in the dehydration circulation loop, the moisture contained in the evaporator of the refrigeration unit is removed. The evaporator of the refrigeration unit does not need to stop operating during the dehydration process, ensuring that production is not affected by equipment failure. Moreover, this dehydration process is simple and easy to operate, avoiding frequent start-ups and shutdowns of the evaporator of the refrigeration unit, increasing equipment life and reducing maintenance costs.

[0010] Furthermore, the tank contains an inner cylinder that can be directly removed from the tank. The 4A molecular sieve is housed within the inner cylinder, which has an opening at the top. The top of the inner cylinder is covered with a sealable cap with several liquid passage holes. With the 4A molecular sieve sealed within the inner cylinder, water-containing dichloromethane flows through the liquid passage holes into the inner cylinder. The 4A molecular sieve absorbs the water content from the dichloromethane. Under the continuous operation of the circulating pump, the water-absorbed dichloromethane flows out of the tank without carrying away the 4A molecular sieve.

[0011] Furthermore, the opening at the top of the inner cylinder is angled from the tank outlet to the tank inlet, and the cap is also angled at the same angle. Since the tank inlet and outlet are on the same horizontal line, the angled opening at the top of the inner cylinder can prevent short circuits between the tank inlet and outlet.

[0012] Furthermore, the inner cylinder cap is threadedly connected to the inner cylinder side wall. After the inner cylinder is removed from the tank, the cap can be easily opened by unscrewing it, allowing the 4A molecular sieve that absorbs moisture to be removed from the inner cylinder for replacement.

[0013] Furthermore, the cap is equipped with a V-shaped lifting handle. The V-shaped lifting handle facilitates the twisting of the cap.

[0014] Furthermore, a sampling port is provided at the bottom of the feed tank, and a flow valve is provided at the sampling port. The flow valve is opened periodically to sample dichloromethane from the feed tank, and the sampled dichloromethane is placed into the equipment to test its moisture content. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the dehydration device of this utility model;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of a basket-type filter.

[0017] The reference numerals in the accompanying drawings of the instruction manual include: 1. Evaporator of the refrigeration unit; 2. Supply circuit; 3. Circuit; 4. Water removal circulation circuit; 5. Basket filter; 51. Tank; 52. Inner cylinder; 53. Cover; 54. V-shaped lifting handle; 55. Inlet; 56. Outlet; 6. Feed tank; 61. Sampling port; 62. Flow valve; 7. Circulation pump; 8. First valve; 9. Second valve; 10. Third valve; 11. Fourth valve; 12. Fifth valve. Detailed Implementation

[0018] The following detailed description illustrates the specific implementation method:

[0019] The basic implementation examples are as follows: Figure 1-2 As shown:

[0020] A refrigerant dehydration device for a new energy refrigeration station, such as Figure 1 As shown, the system includes a supply line 2 and a circuit 3 for the evaporator 1 of the refrigeration unit. A dewatering circulation circuit 4 is connected to the supply line 2 and circuit 3. The dewatering circulation circuit 4 is equipped with a basket filter 5, a feed tank 6, and a circulation pump 7. The basket filter 5, feed tank 6, and circulation pump 7 are sequentially connected from the supply line 2 to the circuit 3. A sampling port 61 is located at the bottom of the feed tank 6, and a flow valve 62 is installed at the sampling port 61. The basket filter 5 contains 4A molecular sieves. The inlet 55 of the basket filter 5 is connected to the supply line 2 of the evaporator 1 of the refrigeration unit via a pipe. The outlet of the filter 5 is connected to the inlet of the feed tank 6 via a pipe. The outlet of the feed tank 6 is connected to the inlet of the circulating pump 7 via a pipe. The outlet of the circulating pump 7 is connected to the circuit 3 of the evaporator 1 of the refrigeration unit via a pipe. A first valve 8 is provided on the supply line 2. A second valve 9 and a third valve 10 are provided on the circuit 3. A fourth valve 11 is provided on the pipe connecting the inlet of the basket filter 5 to the supply line 2. The pipe connecting the outlet of the circulating pump 7 to the circuit 3 is connected between the pipes of the second valve 9 and the third valve 10. A fifth valve 12 is provided on the pipe connecting the outlet of the circulating pump 7 to the circuit 3.

[0021] like Figure 2As shown, the basket filter 5 includes a tank 51. The inlet 55 of the tank 51 is connected to the supply line 2 of the evaporator 1 of the refrigeration unit through a pipe. The outlet 56 of the tank 51 is connected to the inlet 55 of the feed tank 6 through a pipe. An inner cylinder 52 is installed inside the tank 51. The inner cylinder 52 can be directly removed from the tank 51. The inner cylinder 52 contains 4A molecular sieves. The top of the inner cylinder 52 is open. The top of the inner cylinder 52 is threaded and connected to a sealing cap 53 that can close the opening. The sealing cap 53 is provided with several liquid passage holes and a VV-shaped lifting handle 54. The opening at the top of the inner cylinder 52 is inclined from the outlet 56 of the tank 51 to the inlet 55 of the tank 51. The sealing cap 53 is also inclined at the same angle.

[0022] The specific implementation process is as follows:

[0023] During dehydration, the feed tank 6 is pre-filled with anhydrous dichloromethane. The circulating pump 7 is then turned on to replace the anhydrous dichloromethane with the dichloromethane in the evaporator 1 of the refrigeration unit. Figure 1 The direction indicated by the middle arrow represents the flow of dichloromethane. Ice adhering to the inner wall of the evaporator 1 of the refrigeration unit melts into water upon contact with room temperature. The water-containing dichloromethane flows through supply line 2 to the dehydration circulation loop 4, and then circulates through the system to the basket filter 5. The dry 4A molecular sieve in the basket filter 5 adsorbs the water contained in the dichloromethane, thus obtaining anhydrous dichloromethane. The anhydrous dichloromethane is then transferred to the feed tank 6 by the circulation pump 7 for reuse, achieving the purpose of dehydrating the system. Through the coordinated operation of the basket filter 5, feed tank 6, and circulation pump 7 in the dehydration circulation loop 4, the water contained in the evaporator 1 of the refrigeration unit is removed. During the dehydration process, the evaporator 1 of the refrigeration unit does not need to stop operation, ensuring that production is not affected by equipment failure. Moreover, this dehydration process is simple, easy to operate, avoids frequent start-ups and shutdowns of the evaporator 1 of the refrigeration unit, increases equipment lifespan, and reduces maintenance costs.

[0024] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A new energy refrigeration station refrigerant dehydrating device, comprising a supply path and a return path of a refrigerating unit evaporator, characterized in that: The water removal circulation loop is communicated with the supply path and the return path, and a basket filter, a material guiding tank and a circulating pump are arranged on the water removal circulation loop and communicated in sequence from the supply path to the return path; the basket filter comprises a tank body in which 4A molecular sieve is arranged, the inlet of the tank body is communicated with the supply path of the evaporator of the refrigerating unit through a pipeline, the outlet of the tank body is communicated with the inlet of the material guiding tank through a pipeline, the outlet of the material guiding tank is communicated with the inlet of the circulating pump through a pipeline, the outlet of the circulating pump is communicated with the return path of the evaporator of the refrigerating unit through a pipeline, and valves are respectively arranged on the supply path, the return path and the water removal circulation loop.

2. The new energy refrigeration station carrier refrigerant dehydration device according to claim 1, characterized in that: An inner cylinder is arranged in the tank body and can be directly taken out from the tank body, the 4A molecular sieve is arranged in the inner cylinder, the top end of the inner cylinder is open, a cover capable of closing the opening is arranged on the top end of the inner cylinder, and a plurality of liquid passing holes are arranged on the cover.

3. The new energy refrigeration station carrier refrigerant dehydration device according to claim 2, characterized in that: The opening of the top end of the inner cylinder is arranged to be inclined from the outlet of the tank body to the inlet of the tank body, and the cover is also arranged to be inclined at the same angle.

4. The new energy refrigeration station carrier refrigerant dehydration device according to claim 3, characterized in that: The cover is threadedly connected with the side wall of the inner cylinder.

5. The new energy refrigeration station carrier refrigerant dehydration device according to claim 4, characterized in that: A V-shaped lifting handle is arranged on the cover.

6. The new energy refrigeration station carrier refrigerant dehydration device according to claim 5, characterized in that: A sampling port is arranged at the bottom end of the material guiding tank, and a flow valve is arranged on the sampling port.

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