CN216714646U - Water-cooled cooling system of hydrogen compressor - Google Patents

Abstract

The utility model provides a water-cooled cooling system of a hydrogen compressor, which can solve the problem that the existing cooling system of the hydrogen compressor cannot stably operate all the year round. The method comprises primary precooling and secondary vapor compression type cooling, wherein the primary precooling comprises a cooling tower and a first heat exchanger; the two-stage vapor compression type cooling comprises refrigerant circulation and secondary refrigerant circulation, the refrigerant circulation comprises a compressor, a sleeve type condenser, a drying filter, an expansion valve, a heat exchanger II and a gas-liquid separator which are sequentially connected end to end, a cooling medium inlet of the sleeve type condenser is connected with a water outlet of a cooling tower through a pipeline I, a cooling medium outlet of the sleeve type condenser is connected with a water inlet of the cooling tower through a pipeline II, a bypass valve, a water pump II and a temperature sensor are sequentially installed on the pipeline I along the flowing direction of the cooling medium, the bypass valve is further communicated with the pipeline II, and the bypass valve, the water pump II and the temperature sensor are respectively in electric control connection with a PLC (programmable logic controller).

Description

Water-cooled cooling system of hydrogen compressor

Technical Field

The utility model relates to the field of hydrogenation equipment, in particular to a water-cooled cooling system of a hydrogen compressor.

Background

With the enhancement of environmental awareness, new energy automobiles, particularly hydrogen energy automobiles are gradually popular, and a hydrogen compressor and a hydrogenation machine are commonly used when hydrogen is filled into the hydrogen energy automobiles. The hydrogen is pressurized by a hydrogen compressor and then sent into a hydrogenation machine, and then is injected into an automobile hydrogen storage tank by the hydrogenation machine.

Because the hydrogen after the hydrogen compressor pressurization can expand and generate heat, and the automobile hydrogen storage tank has the design target of volume miniaturization, in order to increase the gas storage capacity of the automobile hydrogen storage tank, the hydrogen needs to be cooled down to improve the quality of the unit volume of the high-pressure hydrogen. Some existing hydrogen compressor cooling systems utilize heat exchangers to cool hydrogen respectively at the front and the back of a hydrogen compressor, but cooling media for cooling twice adopt cooling water, the cooling water is cooled by air, and the cooled water temperature is unstable due to different air temperatures all the year round, so that the hydrogen compressor cooling system cannot stably operate all the year round.

Disclosure of Invention

The utility model provides a water-cooled cooling system of a hydrogen compressor, which can ensure the stable operation of the cooling system of the hydrogen compressor all the year round.

The technical scheme is as follows: the water-cooled cooling system of the hydrogen compressor is characterized in that: the system comprises primary precooling and secondary steam compression type cooling, wherein the primary precooling comprises a cooling tower and a first heat exchanger, a first water pump is connected between a water outlet of the cooling tower and a water inlet of the first heat exchanger, and a water outlet of the first heat exchanger is connected with a water inlet of the cooling tower;

the two-stage vapor compression type cooling comprises refrigerant circulation and secondary refrigerant circulation, wherein the refrigerant circulation comprises a compressor, a sleeve type condenser, a drying filter, an expansion valve, a heat exchanger II and a gas-liquid separator which are sequentially connected end to end, a cooling medium inlet of the sleeve type condenser is connected with a water outlet of the cooling tower through a pipeline I, a cooling medium outlet of the sleeve type condenser is connected with a water inlet of the cooling tower through a pipeline II, a bypass valve, a water pump II and a temperature sensor are sequentially installed on the pipeline I along the flowing direction of the cooling medium, the bypass valve is further connected with the pipeline II, and the bypass valve, the water pump II and the temperature sensor are respectively in electric control connection with a PLC (programmable logic controller); the secondary refrigerant circulation comprises a second heat exchanger, a freezing water tank, a third water pump and a hydrogenation machine heat exchanger which are sequentially connected end to end, and a hydrogen compressor is connected between an air inlet of the hydrogenation machine heat exchanger and an air outlet of the first heat exchanger.

It is further characterized in that:

gate valves are arranged on four pipelines between the cooling tower and the first heat exchanger and between the cooling tower and the sleeve type condenser, and gate valves are arranged on pipelines where the third water pump is located.

The first heat exchanger, the second heat exchanger and the hydrogenation machine heat exchanger are plate heat exchangers.

The utility model has the beneficial effects that:

the utility model relates to a water-cooled cooling system of a hydrogen compressor, which comprises primary precooling and secondary vapor compression type cooling, wherein a cooling medium for the primary precooling is cooling water from a cooling tower, and the cooling water is cooled by air in the cooling tower; the cooling medium of the two-stage steam compression type cooling does not adopt cooling water cooled by air any more, but adopts refrigerating medium cooled by refrigerating fluid, the refrigerating fluid exchanges heat with the cooling water from the cooling tower in the double-pipe condenser, because the first pipeline is provided with the bypass valve, the second water pump and the temperature sensor, when the temperature sensor detects that the cooling water from the cooling tower is too cold, the bypass valve and the water pump II can be utilized to suck the heated cooling water in the pipeline II into the pipeline I until the temperature of the cooling water in the pipeline I meets the requirement, the bypass valve disconnects the pipeline I from the management pipe II, thereby ensuring the temperature of the cooling water entering the sleeve type condenser to be stable all the year round, the refrigerating capacity of the refrigerant changes slightly, so that the temperature change of the low-temperature secondary refrigerant entering the heat exchanger of the hydrogenation machine is small, the stable outlet air temperature of the hydrogen compressor is ensured, and the cooling system can stably run all the year round; meanwhile, the secondary refrigerant is cooled by the refrigerant, so that the temperature of the secondary refrigerant is far lower than the temperature of cooling water from the cooling tower, the temperature difference between the secondary refrigerant and hydrogen is larger, and the cooling effect on the hydrogen is better.

Drawings

Fig. 1 is a schematic diagram of a cooling system of the present invention.

Reference numerals: 1-a cooling tower; 2, a first heat exchanger; 3, a first water pump; 4-a compressor; 5-double pipe condenser; 6-drying the filter; 7-an expansion valve; 8, a second heat exchanger; 9-gas-liquid separator; 10-pipeline one; 11-line two; 12-a bypass valve; 13-a water pump II; 14-a temperature sensor; 15-a freezing water tank; 16-water pump III; 17-a hydrotreater heat exchanger; 18-a hydrogen compressor; 19-a gate valve; 20-an exhaust pipe; 21-a liquid tube; 22-trachea; 23-suction pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the water-cooled cooling system of the hydrogen compressor comprises primary precooling and secondary vapor compression type cooling, wherein the primary precooling comprises a cooling tower 1 and a heat exchanger I2, a water pump I3 is connected between a water outlet of the cooling tower 1 and a water inlet of the heat exchanger I2, and a water outlet of the heat exchanger I2 is connected with a water inlet of the cooling tower 1; the two-stage vapor compression type cooling comprises refrigerant circulation and secondary refrigerant circulation, wherein the refrigerant circulation comprises a compressor 4, a double-pipe condenser 5, a drying filter 6, an expansion valve 7, a heat exchanger II 8 and a gas-liquid separator 9 which are sequentially connected end to end, a cooling medium inlet of the double-pipe condenser 5 is connected with a water outlet of a cooling tower 1 through a pipeline I10, a cooling medium outlet of the double-pipe condenser 5 is connected with a water inlet of the cooling tower 1 through a pipeline II 11, a bypass valve 12, a water pump II 13 and a temperature sensor 14 are sequentially arranged on the pipeline I10 along the flowing direction of the cooling medium, the bypass valve 12 is further connected with the pipeline II 11, and the bypass valve 12, the water pump II 13 and the temperature sensor 14 are respectively in electric control connection with a PLC (programmable logic controller); the secondary refrigerant cycle comprises a second heat exchanger 8, a freezing water tank 15, a third water pump 16 and a hydrogenation machine heat exchanger 17 which are sequentially connected end to end, and a hydrogen compressor 18 is connected between an air inlet of the hydrogenation machine heat exchanger 17 and an air outlet of the first heat exchanger 2; gate valves 19 are arranged on four pipelines between the cooling tower 1 and the heat exchanger I2 and between the cooling tower and the double-pipe condenser 5, a gate valve 19 is arranged on a pipeline where the water pump III 16 is located, and by arranging the gate valves, corresponding gate valves can be closed to repair under the condition that the water pump is damaged; the first heat exchanger 2, the second heat exchanger 8 and the hydrogenation machine heat exchanger 17 are plate heat exchangers, so that the heat exchange effect is good, and the occupied space is small.

The operation of the water-cooled cooling system of the hydrogen compressor of the present invention is described in detail below: in the first-stage precooling, hydrogen enters a first heat exchanger 2, cooling water is cooled in a cooling tower 1 and then is sucked by a first water pump 3, the cooling water is pressurized and then is sent into the first heat exchanger 2 to exchange heat with the hydrogen flowing through the first heat exchanger 2, the cooling water flows back to the cooling tower 1 after being heated, and the cooling water is cooled in the cooling tower 1 and then enters the next cycle; after the hydrogen in the heat exchanger I2 is cooled, the hydrogen is pressurized by a hydrogen compressor 18 and then sent into a hydrogenation machine heat exchanger 17 for secondary vapor compression type cooling. In the secondary vapor compression type cooled secondary refrigerant circulation, the low-temperature secondary refrigerant circularly flows among the freezing water tank 15, the third water pump 16, the heat exchanger 17 of the hydrogenation machine and the second heat exchanger 8, the low-temperature secondary refrigerant exchanges heat with high-temperature hydrogen in the heat exchanger 17 of the hydrogenation machine to take away heat in the high-temperature hydrogen, the heated low-temperature secondary refrigerant flows out of the heat exchanger 17 of the hydrogenation machine, enters the second heat exchanger 8, exchanges heat with the refrigerant flowing through the second heat exchanger 8, then enters the freezing water tank 15 and enters the next circulation; in a refrigerant cycle, high-temperature and high-pressure refrigerant gas discharged by a compressor 4 enters an extension-type condenser 5 through an exhaust pipe 20, the high-temperature and high-pressure refrigerant gas exchanges heat with cooling water discharged from a cooling tower 1 in the extension-type condenser 5 to release heat and is condensed into high-temperature and high-pressure refrigerant liquid, the high-temperature and high-pressure refrigerant liquid enters a drying filter 6 through a liquid pipe 21 to be filtered, is throttled by an expansion valve 7 to be changed into a low-temperature and low-pressure refrigerant gas-liquid two-phase mixture, then enters a heat exchanger II 8, absorbs the heat of secondary refrigerant in the heat exchanger II 8 and is gasified into low-temperature and low-pressure refrigerant gas, the low-temperature and low-pressure refrigerant gas is sucked by the compressor 4 through an air pipe 22, a gas-liquid separator 9 and an air suction pipe 23, and is discharged through the exhaust pipe 20 after being compressed and enters the next cycle; when the cooling water from the cooling tower 1 is too cold due to external temperature change (in the annual operation, the cooling water from the cooling tower at the highest temperature can also meet the cooling requirement on the refrigerant, and the situation of overheating of the cooling water cannot occur), the PLC receives a signal of the temperature sensor, the bypass valve 12 is controlled to be communicated with the pipeline II 11, the water pump II 13 sucks the heated cooling water from the double-pipe condenser 5 into the pipeline I10 to be mixed with the cooling water from the cooling tower 1, and after the temperature of the cooling water is increased to a proper range, the PLC controls the bypass valve 12 to disconnect the communication between the pipeline I11 and the pipeline II 13, so that the refrigerating capacity change of the refrigerant is small, and the stable operation of the cooling system all year round is ensured.

The water-cooled cooling system of the hydrogen compressor provided by the utility model is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (3)

1. The water-cooled cooling system of the hydrogen compressor is characterized in that: the system comprises primary precooling and secondary steam compression type cooling, wherein the primary precooling comprises a cooling tower (1) and a heat exchanger I (2), a water pump I (3) is connected between a water outlet of the cooling tower (1) and a water inlet of the heat exchanger I (2), and a water outlet of the heat exchanger I (2) is connected with a water inlet of the cooling tower (1); the two-stage steam compression type cooling comprises a refrigerant cycle and a secondary refrigerant cycle, the refrigerant cycle comprises a compressor (4), a double-pipe condenser (5), a drying filter (6), an expansion valve (7), a heat exchanger II (8) and a gas-liquid separator (9) which are sequentially connected end to end, a cooling medium inlet of the double-pipe condenser (5) is connected with a water outlet of the cooling tower (1) through a first pipeline (10), the cooling medium outlet of the double-pipe condenser (5) is connected with the water inlet of the cooling tower (1) through a second pipeline (11), a bypass valve (12), a water pump II (13) and a temperature sensor (14) are sequentially arranged on the pipeline I (10) along the flowing direction of the cooling medium, the bypass valve (12) is further connected with the second pipeline (11), and the bypass valve (12), the second water pump (13) and the temperature sensor (14) are respectively in electric control connection with a PLC (programmable logic controller); the secondary refrigerant cycle comprises a second heat exchanger (8), a freezing water tank (15), a third water pump (16) and a hydrogenation machine heat exchanger (17) which are sequentially connected end to end, and a hydrogen compressor (18) is connected between an air inlet of the hydrogenation machine heat exchanger (17) and an air outlet of the first heat exchanger (2).

2. The water-cooled cooling system for a hydrogen compressor according to claim 1, wherein: gate valves (19) are arranged on four pipelines between the cooling tower (1) and the first heat exchanger (2) and the double-pipe condenser (5), and gate valves (19) are arranged on a pipeline where the third water pump (16) is located.

3. The water-cooled cooling system for a hydrogen compressor according to claim 1 or 2, wherein: the first heat exchanger (2), the second heat exchanger (8) and the hydrogenation machine heat exchanger (17) are plate heat exchangers.

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