Cooling capacity utilization device for liquid nitrogen vaporizer

Abstract

The utility model discloses a liquid nitrogen vaporizer cooling capacity utilization device which comprises a cooling capacity circulation loop, a liquid nitrogen vaporization passage based on heat absorption and an air compression passage based on heat release, the cooling capacity circulation loop is arranged between the liquid nitrogen vaporization passage and the air compression passage, and cooling capacity of the liquid nitrogen vaporization passage enters the air compression passage through the cooling capacity circulation loop; the cooling capacity circulation loop comprises a first cooling capacity tube and a second cooling capacity tube, the input end of the first cooling capacity tube is connected to the output end of the water bath vaporizer, the output end of the first cooling capacity tube is connected to the input end of the heat exchanger, the input end of the second cooling capacity tube is connected to the output end of the heat exchanger, and the output end of the second cooling capacity tube is connected to the input end of the water bath vaporizer; cold circulation in the cold utilization device of the liquid nitrogen vaporizer not only avoids cold waste of liquid nitrogen, but also can reduce load of the air temperature type vaporizer and prevent frosting. And meanwhile, the power consumption of the freezing dryer can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery preparation, in particular to a cold capacity utilization device for a liquid nitrogen vaporizer. Background Art

[0002] Nitrogen is widely used as a protective gas in the lithium battery industry. One of the conventional methods of producing nitrogen is that the liquid nitrogen in the liquid nitrogen storage tank flows into the air-temperature vaporizer, absorbs the heat of the air and vaporizes into nitrogen. The vaporization of liquid nitrogen is an endothermic process, and the cold contained in the liquid nitrogen is taken away by the air, resulting in a large amount of cold waste; and the surface of the air-temperature vaporizer is prone to frost, which affects the vaporization effect, and it is necessary to defrost regularly or switch to a standby vaporizer.

[0003] The cold dryer is one of the post-processing equipment in the compressed air system. The air compressor will generate a lot of heat in the process of compressing air. The high-temperature compressed air produced must first be cooled and dehumidified by the cold dryer, and then adsorbed and dehumidified by the adsorption dryer before being sent to the gas user. The cold dryer also consumes a certain amount of electricity during operation. Utility Model Content

[0004] Based on the technical problems existing in the background technology, the utility model proposes a liquid nitrogen vaporizer cold energy utilization device, which utilizes the cold energy lost when liquid nitrogen is vaporized to produce chilled water, reduces the temperature and humidity of the compressed air at the air compressor outlet, avoids the waste of liquid nitrogen cold energy, reduces the load of the air temperature vaporizer, prevents the occurrence of frosting, and effectively reduces the power consumption of the cold dryer.

[0005] The utility model provides a cold energy utilization device for a liquid nitrogen vaporizer, comprising a cold energy circulation loop, a liquid nitrogen vaporization passage based on heat absorption, and an air compression passage based on heat release. A cold energy circulation loop is arranged between the liquid nitrogen vaporization passage and the air compression passage, and the cold energy of the liquid nitrogen vaporization passage enters the air compression passage through the cold energy circulation loop.

[0006] Furthermore, the liquid nitrogen vaporization passage includes a liquid nitrogen storage tank, an air-temperature vaporizer and a water-bath vaporizer, the input end of the air-temperature vaporizer and the water-bath vaporizer being arranged in parallel is connected to the output end of the liquid nitrogen storage tank, and the output end is connected to the output pipeline.

[0007] Furthermore, the input end of the water bath vaporizer is provided with a regulating valve for regulating the flow of liquid nitrogen entering the water bath vaporizer.

[0008] Furthermore, the air compression passage includes an air compressor, a heat exchanger, a cold dryer and an adsorption dryer connected in sequence, the output end of the adsorption dryer is connected to an external pipeline, and the heat exchanger and the water bath evaporator are connected through a cold circulation loop.

[0009] Furthermore, a dew point meter for detecting the dew point temperature of compressed air in the pipeline is arranged on the pipeline connecting the heat exchanger and the cold dryer.

[0010] Furthermore, a drainage pipeline is provided at a low point of the heat exchanger.

[0011] Furthermore, the cold circulation loop includes a first cold tube and a second cold tube, the input end of the first cold tube is connected to the output end of the water bath evaporator, and the output end is connected to the input end of the heat exchanger, and the input end of the second cold tube is connected to the output end of the heat exchanger, and the output end is connected to the input end of the water bath evaporator.

[0012] Furthermore, a water pump for pumping the cold water output from the water bath evaporator to the heat exchanger and a temperature sensor for detecting the temperature of the cold water entering the heat exchanger are arranged on the first cold pipe.

[0013] The advantages of the cold capacity utilization device of a liquid nitrogen vaporizer provided by the utility model are as follows: the cold capacity utilization device of a liquid nitrogen vaporizer provided in the utility model structure, the high-temperature chilled water in the cold capacity circulation loop is vaporized by liquid nitrogen in the water bath type vaporizer to absorb heat and become low-temperature chilled water, which is pressurized by a water pump and sent to the heat exchanger to absorb the heat of the compressed air at the outlet of the air compressor and become high-temperature chilled water. This cold capacity circulation not only avoids the waste of cold capacity of liquid nitrogen, but also can reduce the load of the air temperature type vaporizer and prevent the occurrence of frosting; at the same time, it can effectively reduce the power consumption of the cold dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Among them, 1-cold circulation loop, 2-liquid nitrogen vaporization passage, 3-air compression passage, 11-first cold tube, 12-second cold tube, 13-water pump, 14-temperature sensor, 21-liquid nitrogen storage tank, 22-air temperature vaporizer, 23-water bath vaporizer, 24-regulating valve, 31-air compressor, 32-heat exchanger, 33-cold dryer, 34-absorption dryer, 35-dew point meter. DETAILED DESCRIPTION

[0016] Below, the technical solution of the utility model is described in detail through specific embodiments. Many specific details are described in the following description to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific implementation disclosed below.

[0017] like Figure 1As shown, the utility model proposes a liquid nitrogen vaporizer cold energy utilization device, comprising a cold energy circulation loop 1, a liquid nitrogen vaporization passage 2 based on heat absorption, and an air compression passage 3 based on heat release. The cold energy circulation loop 1 is arranged between the liquid nitrogen vaporization passage 2 and the air compression passage 3, and the cold energy of the liquid nitrogen vaporization passage 2 enters the air compression passage 3 through the cold energy circulation loop 1.

[0018] The cold energy lost when liquid nitrogen vaporizes is used to produce chilled water and sent to the heat exchanger 32 of the air pressure passage 3, thereby reducing the temperature and humidity of the compressed air at the outlet of the air compressor 31 in the air pressure passage 3 and avoiding the waste of cold energy of liquid nitrogen.

[0019] The liquid nitrogen vaporization passage 2 includes a liquid nitrogen storage tank 21, an air-temperature vaporizer 22 and a water-bath vaporizer 23. The input end of the air-temperature vaporizer 22 and the water-bath vaporizer 23 are connected in parallel to the output end of the liquid nitrogen storage tank 21, and the output end is connected to the output pipeline.

[0020] Two vaporization pipelines are arranged behind the liquid nitrogen storage tank 21: the one flowing through the water bath vaporizer 23 is vaporization pipeline 1, and the one flowing through the air temperature vaporizer 22 is vaporization pipeline 2; vaporization pipelines 1 and 2 are then combined into an output pipeline to supply nitrogen to the outside.

[0021] The air compression passage 3 includes an air compressor 31, a heat exchanger 32, a cold dryer 33 and a desiccant 34 which are connected in sequence. The output end of the desiccant 34 is connected to an external pipeline. The heat exchanger 32 and the water bath evaporator 23 are connected through a cold circulation loop 1. A drainage pipeline is provided at the low point of the heat exchanger 32 to automatically discharge the moisture condensed by the compressed air after being cooled by the heat exchanger 32.

[0022] The air compressor 31 is a micro-oil screw air compressor or an oil-free screw air compressor, and a heat exchanger 32 is arranged at its outlet. The compressed air produced by the air compressor 31 first flows through the heat exchanger 32, is cooled and dehumidified by the chilled water therein, and then flows through the cold dryer 33 and the dehumidifier 34 in sequence before being output.

[0023] The cold circulation loop 1 includes a first cold pipe 11 and a second cold pipe 12. The input end of the first cold pipe 11 is connected to the output end of the water bath evaporator 23, and the output end is connected to the input end of the heat exchanger 32. The input end of the second cold pipe 12 is connected to the output end of the heat exchanger 32, and the output end is connected to the input end of the water bath evaporator 23. The water bath evaporator 23 and the heat exchanger 32 form a cold circulation loop 1. The high-temperature chilled water in the cold circulation loop 1 is vaporized by liquid nitrogen in the water bath evaporator 23 to absorb heat and become low-temperature chilled water, which is pressurized by the water pump 13 and sent to the heat exchanger 32. The chilled water can be selected from a 25% ethylene glycol aqueous solution, and the chilled water temperature can be set to -5°C.

[0024] The input end of the water bath vaporizer 23 is provided with a regulating valve 24 for regulating the flow of liquid nitrogen entering the water bath vaporizer 23. The regulating valve 24 uses the temperature sensor 14 on the circulation loop to regulate the amount of liquid nitrogen entering the water bath vaporizer 23 according to the cold amount. When the temperature sensor 14 detects that the temperature of the low-temperature chilled water is lower than the set low value, the regulating valve 24 reduces the opening degree, reduces the flow of liquid nitrogen entering the water bath vaporizer 23, and prevents the chilled water from solidifying due to overcooling. At this time, the flow of liquid nitrogen entering the air temperature vaporizer 22 increases; when the temperature sensor 14 detects that the temperature of the chilled water is higher than the set high value, the regulating valve 24 increases the opening degree, increases the flow of liquid nitrogen entering the water bath vaporizer 23, and at this time, the flow of liquid nitrogen entering the air temperature vaporizer 22 decreases.

[0025] A dew point meter 35 for detecting the dew point temperature of compressed air at the outlet of the heat exchanger 32 is provided on the pipeline connecting the heat exchanger 32 and the cold dryer 33. The load of the cold dryer 33 can be reduced according to the dew point temperature of the compressed air monitored by the dew point meter 35. When the dew point temperature of the compressed air is stabilized in the range of 2 to 10°C, the cold dryer 33 can be shut down, thereby reducing the power consumption of the cold dryer 33.

[0026] Working process: the liquid nitrogen in the liquid nitrogen storage tank 21 enters the output pipeline through the vaporization pipeline 1 and the vaporization pipeline 2, and the compressed air of the air compressor 31 is output to the external pipeline through the heat exchanger 32, the cold dryer 33, and the adsorption dryer 34. During the working process of the liquid nitrogen vaporization passage 2 and the air compression passage 3, the high-temperature chilled water in the cold circulation loop 1 is vaporized by liquid nitrogen in the water bath vaporizer 23 to absorb heat and become low-temperature chilled water, which is pressurized by the water pump 13 and sent to the heat exchanger 32 to absorb the heat of the compressed air at the outlet of the air compressor 31 to become high-temperature chilled water. This cold cycle not only avoids the waste of cold capacity of liquid nitrogen, but also reduces the load of the air temperature vaporizer 22 and prevents the occurrence of frosting; at the same time, it can effectively reduce the power consumption of the cold dryer 33.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquid nitrogen vaporizer cold energy utilization device, characterized in that: The invention comprises a cold circulation loop (1), a liquid nitrogen vaporization passage (2) based on heat absorption, and an air compression passage (3) based on heat release. The cold circulation loop (1) is arranged between the liquid nitrogen vaporization passage (2) and the air compression passage (3), and the cold of the liquid nitrogen vaporization passage (2) enters the air compression passage (3) through the cold circulation loop (1).

2. The liquid nitrogen vaporizer cold energy utilization device according to claim 1, characterized in that: The liquid nitrogen vaporization passage (2) comprises a liquid nitrogen storage tank (21), an air-temperature vaporizer (22) and a water-bath vaporizer (23); the air-temperature vaporizer (22) and the water-bath vaporizer (23) are arranged in parallel, the input end of which is connected to the output end of the liquid nitrogen storage tank (21), and the output end of which is connected to the output pipeline.

3. The liquid nitrogen vaporizer cold energy utilization device according to claim 2, characterized in that: The input end of the water bath vaporizer (23) is provided with a regulating valve (24) for regulating the flow rate of liquid nitrogen entering the water bath vaporizer (23).

4. The liquid nitrogen vaporizer cold energy utilization device according to claim 2, characterized in that: The air compression passage (3) comprises an air compressor (31), a heat exchanger (32), a cold dryer (33) and a desiccant (34) which are connected in sequence, the output end of the desiccant (34) being connected to an external pipeline, and the heat exchanger (32) and the water bath evaporator (23) being connected via a cold circulation loop (1).

5. The liquid nitrogen vaporizer cold energy utilization device according to claim 4, characterized in that: A dew point meter (35) for detecting the dew point temperature of compressed air at an outlet of the heat exchanger (32) is provided on a pipeline connecting the heat exchanger (32) and the cold dryer (33).

6. The cold energy utilization device of liquid nitrogen vaporizer according to claim 4, characterized in that: A drainage pipeline is provided at a low point of the heat exchanger (32).

7. The cold energy utilization device of liquid nitrogen vaporizer according to claim 4, characterized in that: The cooling circulation loop (1) comprises a first cooling tube (11) and a second cooling tube (12); the input end of the first cooling tube (11) is connected to the output end of the water bath evaporator (23), and the output end is connected to the input end of the heat exchanger (32); the input end of the second cooling tube (12) is connected to the output end of the heat exchanger (32), and the output end is connected to the input end of the water bath evaporator (23).

8. The cold energy utilization device of liquid nitrogen vaporizer according to claim 7, characterized in that: A water pump (13) for pumping cold water output from the water bath evaporator (23) into the heat exchanger (32) and a temperature sensor (14) for detecting the temperature of cold water entering the heat exchanger (32) are provided on the first cold pipe (11).

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