CN109539693B - Gas cooling system and gas cooling method - Google Patents
Gas cooling system and gas cooling method Download PDFInfo
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- CN109539693B CN109539693B CN201811411493.2A CN201811411493A CN109539693B CN 109539693 B CN109539693 B CN 109539693B CN 201811411493 A CN201811411493 A CN 201811411493A CN 109539693 B CN109539693 B CN 109539693B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
- F25J3/0695—Start-up or control of the process; Details of the apparatus used
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
- F25J2205/32—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as direct contact cooling tower to produce a cooled gas stream, e.g. direct contact after cooler [DCAC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
- F25J2205/34—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as evaporative cooling tower to produce chilled water, e.g. evaporative water chiller [EWC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
- F25J2270/906—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by heat driven absorption chillers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Sorption Type Refrigeration Machines (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a gas cooling system and a gas cooling method, which comprise a compressor, first heat exchange equipment, a regenerator, a first cooling tower and second heat exchange equipment, wherein the first heat exchange equipment at least comprises a first flow channel and a second flow channel, the compressor is communicated with the first flow channel, and the first flow channel is communicated with the first cooling tower; the second flow passage is communicated with the regenerator; the second heat exchange equipment at least comprises a third flow channel, a first cavity, a fourth flow channel and a second cavity, fluid in the third flow channel is in heat exchange with fluid in the first cavity, fluid in the fourth flow channel is in heat exchange with fluid in the second cavity, the first cavity can be communicated with the second cavity, the regenerator is communicated with the first cavity, and the first cavity is communicated with the second flow channel; the fourth flow passage is communicated with the first cooling tower. The invention provides a gas cooling system and a gas cooling method, which can provide low-temperature air required by air separation.
Description
Technical Field
The invention relates to the field of refrigeration, in particular to a precooling system in a gas cooling system.
Background
The air separation (air separation for short) technology is mainly used for producing other industrially required gases such as liquid oxygen, liquid nitrogen, liquid argon, helium and the like from air in the atmosphere by low-temperature liquefaction and the like. The generated gas is mainly used in industrial and civil occasions such as steel making, coal chemical industry, medical treatment and the like. A typical air separation system generally includes air purification, molecular sieves, compressors, pre-cooling systems, rectification systems, and other associated support systems.
In a typical air separation plant pre-cooling treatment system, the temperature of high-temperature and high-pressure air from a final-stage compressor reaches about 105 ℃, heat exchange with normal-temperature water (32 ℃) from a cold water pool is firstly reduced to 40 ℃ in a first cooling tower, and then heat exchange with chilled water (6 ℃) from a second cooling tower is reduced to 8 ℃. In such a cooling method, the air at 105 ℃ transfers heat to the normal temperature cooling water, and the cooling water (40 ℃) after temperature rise enters the circulating water to be cooled in the atmosphere and release heat. Then, the heat corresponding to the 105 ℃ air is discharged into the atmosphere and is not utilized, resulting in a large amount of energy waste.
The invention discloses an air separation system for recovering waste heat of compressed air, which is disclosed in the Chinese patent with the publication number of CN107940801A, and utilizes the heat of high-temperature air during interstage compression of a compressor to drive a closed absorption system to recover part of the waste heat of the compressed air, and generates refrigerating capacity for further cooling the compressed air to enable the compressed air to reach a required state. In addition, the system is provided with a lithium bromide dehumidifier in front of the compressor for removing water vapor in the air, so that the compression stages are reduced.
The device adopts single-effect closed absorption refrigeration system, and the system has higher requirement for the temperature of air. The temperature of the heat source air is continuously reduced along with the heat release, and the heat source is a temperature-variable heat source. When the temperature is reduced to a certain temperature, the water cannot be used continuously. At temperatures of 114 ℃ and below, the temperature drop of the air after passing through the generator of the closed system is limited, typically up to 90 ℃, and a lower temperature drop reduces the refrigeration capacity of the absorption refrigerator, so that the final cooled air temperature is higher. The device utilizes lithium bromide solution (absorbent) to absorb moisture in the air, and the dehydrated air enters the compressor. Although this method can remove some of the water in the air, lithium bromide (absorbent) vapor can be entrained in the air and cause damage to the operation of the compressor.
Disclosure of Invention
The invention provides a gas cooling system and a gas cooling method, which can provide low-temperature air required by air separation.
In order to realize the purpose, the following technical scheme is adopted:
a gas cooling system comprises a compressor, a first heat exchange device, a regenerator, a first cooling tower and a second heat exchange device,
the first heat exchange device at least comprises a first flow channel and a second flow channel, the compressor is communicated with the first flow channel, and the first flow channel is communicated with the first cooling tower; the second flow passage is communicated with the regenerator;
the second heat exchange equipment at least comprises a third flow channel, a first cavity, a fourth flow channel and a second cavity, fluid in the third flow channel is in heat exchange with fluid in the first cavity, fluid in the fourth flow channel is in heat exchange with fluid in the second cavity, the first cavity can be communicated with the second cavity, the regenerator is communicated with the first cavity, and the first cavity is communicated with the second flow channel; the fourth flow passage is communicated with the first cooling tower.
In order to realize the purpose, the following technical scheme is adopted: a gas cooling method comprising:
inputting air compressed by a compressor into first heat exchange equipment, and carrying out heat exchange between the air and a salt solution in the first heat exchange equipment to cool the air;
the cooled air enters a first cooling tower to be further cooled for standby;
inputting the salt solution in the first heat exchange equipment into a regenerator, supplying air to the regenerator, absorbing water in the salt solution by the air in the regenerator, and discharging the air absorbing the water in the salt solution out of the regenerator;
and decompressing the salt solution leaving from the regenerator, allowing the salt solution to enter a second heat exchange device, allowing the salt solution to enter the first heat exchange device after absorbing water vapor, and allowing the salt solution to circularly flow, wherein the second heat exchange device provides cold fluid for the first cooling tower for cooling air.
According to the technical scheme, the first heat exchange equipment and the second heat exchange equipment are arranged in the gas cooling system, the first heat exchange equipment is at least provided with the first flow channel and the second flow channel, high-temperature gas from the compressor exchanges heat with fluid in the second flow channel through the first flow channel, the temperature of the gas from the compressor is reduced, the first cooling is achieved, then the gas from the first flow channel enters the first cooling tower, exchanges heat with the fluid from the fourth flow channel, the second cooling is achieved, therefore, the two times of cooling of the gas from the compressor are achieved, and low-temperature air required by air separation can be provided. Meanwhile, the fluid in the second flow passage absorbs the fluid heat in the first flow passage, so that the fluid in the second flow passage is favorable for regeneration in the regenerator, and the utilization of heat is facilitated.
Drawings
FIG. 1 is a system diagram of one embodiment of the present invention;
FIG. 2 is a system diagram of another embodiment of the present invention;
FIG. 3 is a system diagram of another embodiment of the present invention;
wherein: 1 air supply equipment, 2 compressors, 3 first heat exchange equipment, 31 first flow channel, 32 second flow channel, 4 regenerators, 5 first cooling towers, 6 molecular sieves, 7 second pumps, 8 circulating water, 9 sewage nitrogen pipelines, 10 second cooling towers, 11 second control valves, 12 water inlet pipes, 13 first control valves, 14 first cavities, 15 second cavities, 16 pressure reducing devices, 17 air pipelines, 18 first pumps, 19 third flow channels, 20 fourth flow channels, 24 third heat exchange equipment, 25 second heat exchange equipment, 26 first heat exchangers and 27 second heat exchangers,
Detailed Description
Referring to fig. 1, fig. 1 illustrates a system schematic of a gas cooling system 100, the system 100 comprising a compressor 2, a first heat exchange device 3, a regenerator 4, a first cooling tower 5, a second heat exchange device 25,
the first heat exchange device 3 at least comprises a first flow passage 31 and a second flow passage 32, the compressor 2 is communicated with the first flow passage 31, and the first flow passage 31 is communicated with the first cooling tower 5; the second flow passage 32 communicates with the regenerator 4;
the second heat exchange device 25 at least comprises a third flow passage 19, a first chamber 14, a fourth flow passage 20 and a second chamber 15, fluid in the third flow passage 19 exchanges heat with fluid in the first chamber 14, fluid in the fourth flow passage 20 exchanges heat with fluid in the second chamber 15, the first chamber 14 can be communicated with the second chamber 15, the regenerator 4 is communicated with the first chamber 14, and the first chamber 14 is communicated with the second flow passage; the fourth flow passage 20 is communicated with the first cooling tower 5; the third flow channel 19 is in communication with circulating water.
The gas from the compressor 2 is in a high-temperature and high-pressure state, the gas exchanges heat with the fluid from the first heat exchange device 3 and the second heat exchange device 25, the gas from the compressor 2 enters the first cooling tower 5 after being cooled, and is further cooled in the first cooling tower 5.
The fluid in the first flow channel 31 is air, and the fluid in the second flow channel 32 may be a salt solution such as lithium bromide, lithium chloride, lithium nitrate, calcium chloride, potassium formate, or any one of alkyl imidazole ionic liquid aqueous solutions. Wherein the ionic liquid aqueous solution is preferably 1-ethyl-3-methylimidazole tetrachloroborate ([ Emim ] [ BF4]) aqueous solution and chloro-1-ethyl-3-methylimidazole ([ Emim ] Cl ]) aqueous solution; the fluid in the third flow channel is water or aqueous solution, and the fluid in the fourth flow channel is water or aqueous solution.
The fluid that comes out from first chamber 14 of second heat exchange equipment 25 is low concentration salt solution, and this low concentration salt solution becomes high temperature low concentration salt solution after absorbing the heat of the gas that compressor 2 came out in first heat exchange equipment 3, then gets into regenerator 4, and this high temperature low concentration salt solution becomes high temperature high concentration salt solution in regenerator 4, then gets into first chamber 14 of second heat exchange equipment 25, and this high temperature high concentration salt solution carries out the heat transfer with the fluid in third runner 19 in second heat exchange equipment 25, and the cooling absorbs the vapor of second chamber 15, becomes low temperature low concentration salt solution and gets into first heat exchange equipment 3.
This gas cooling system utilizes the vapor partial pressure difference drive of low concentration salt solution and outside air to accomplish regeneration process, become high concentration salt solution from low concentration salt solution, fluid heat absorption becomes vapor in second chamber 15, high concentration salt solution absorbs the vapor and becomes low concentration salt solution, so utilize high temperature low concentration salt solution to carry out precooling once to high-temperature gas, then carry out the secondary precooling to it in first cooling tower 5, realize gaseous secondary cooling, the heat utilization efficiency is high, and this cooling gas can supply follow-up air separation to use. In addition, through the heat exchange between the fluid in the second flow channel and the fluid in the first fluid, the waste heat of the fluid from the compressor is further utilized, and the utilization of heat is facilitated.
The gas cooling system comprises an air duct 17, the regenerator 4 has a gas inlet 4a and a gas outlet 4b, the gas inlet 4a is in communication with the air duct 17, the gas outlet 4b may be in communication with the outside atmosphere, and air is circulated in the air duct 17. In the regenerator 4, the external air flows in from the air pipeline, and the external air absorbs the water in the low-concentration salt solution entering the regenerator 4, and because the low-concentration salt solution is regenerated by the external flowing air, compared with the system provided in the background art, the temperature of the exhaust gas driving the temperature-variable heat source can be greatly reduced to 40 ℃, and therefore, the heat utilization efficiency can be improved by at least 40%. This is because, like the system proposed in the background art, when the temperature of the compressed air is reduced to 70 ℃, the partial pressure of the surface vapor corresponding to the temperature of the heated solution is lower than the generation pressure in the system, and the solution cannot be continuously regenerated, so that the heat utilization rate is low.
The regenerator 4 is an open device, the working pressure of the regenerator is atmospheric pressure, the regenerator can adopt the forms of a filler tower type regenerator, a falling film type regenerator, a membrane separation type regenerator and the like, and the moisture absorption solution regeneration is realized by taking the partial pressure difference of surface steam between the external regeneration air and the moisture absorption solution as the driving force.
The gas cooling system comprises a pressure reducing device 16, the pressure reducing device 16 is connected between the regenerator 4 and the second heat exchange device 25, and the pressure in the regenerator 4 is greater than the pressure in the second heat exchange device 25. The pressure reducing device 16 reduces the pressure of the high-concentration salt solution flowing out of the regenerator 4 to negative pressure, which is beneficial to absorbing water in the second heat exchange equipment 25 by the high-concentration salt solution and is beneficial to the high-efficiency operation of the system. Herein, negative pressure means a pressure lower than normal one atmosphere.
It should be noted that the connection between the regenerator 4 and the second heat exchange means 25 is not limited to the location between the regenerator 4 and the second heat exchange means 25, but means that the pressure reducing device is located in the connection line between the regenerator 4 and the second heat exchange means 25, although it is possible to integrate it without a line.
The pressure reducing device may be, for example, a pressure reducing valve, a throttle valve, or the like.
Second heat exchange means 25 has a first inlet 25a and a second inlet 25b, said first inlet 25a communicating with said first chamber 14, said second inlet 25b communicating with said second chamber 15, said first inlet 25a being located at a higher level than said second inlet 25 b. The first inlet 25a communicates with the fluid outlet of the regenerator 4. The second inlet 25b is a waterway inlet, which may be supplied with outside water. Thus, the water from the second inlet 25b can first exchange heat with the fluid in the fourth flow channel and then change into steam to enter the first chamber 14.
The second heat exchange device 25 may be a unitary structure, the second heat exchange device 25 has a housing and a partition wall 251, the partition wall 251 is connected to the bottom of the housing, the third flow channel 19 and the fourth flow channel 20 are located at two sides of the partition wall 251, the first chamber 14 and the second chamber 15 are approximately separated by the partition wall 251, and the first chamber 14 and the second chamber 15 are communicated at the top region of the second heat exchange device 25.
In the schematic diagram shown in fig. 1, the second heat exchange device 25 has a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is provided with a third flow passage 19, the second heat exchange pipeline is provided with a fourth flow passage 20, the first heat exchange pipeline and the second heat exchange pipeline are located inside the shell, and the partition wall 251 separates the first heat exchange pipeline and the second heat exchange pipeline.
The gas cooling system comprises a first pump 18 and a second pump 7, the first pump 18 is connected with the first heat exchange device 3 and the second heat exchange device 25, and the first pump 18 is communicated with a fluid outlet of the second heat exchange device 25 and a fluid inlet of the first heat exchange device 3. The second pump 7 is communicated with the second heat exchange device 25 and the first cooling tower 5, and the second pump 7 is communicated with the outlet of the fourth flow passage 20 and the fluid inlet of the first cooling tower 5. The first pump 18 provides a power source for the second flow passage, and the arrangement of the first pump and the second pump enables fluid to flow more smoothly.
The low-temperature low-concentration salt solution in the first cavity 14 of the second heat exchange device 25 is pressurized by the first pump 18 and enters the first heat exchange device 3, and the low-temperature low-concentration salt solution exchanges heat with the high-temperature gas from the compressor 2. The fluid in the fourth flow channel can enter the top of the first cooling tower 5 under the driving of the second pump 7, is sprayed downwards from the top of the first cooling tower 5, and is in contact with the air entering the first flow channel for heat exchange, so that the air is further cooled. Meanwhile, the fluid from the fourth flow channel is sprayed downwards in the first cooling tower, and impurities in the air can be cleaned and discharged from the bottom of the first cooling tower 5, so that the subsequent molecular sieve 6 has a lower filtering load and a longer service life. Because the high-temperature air gives off partial heat in the heat exchange of first heat exchange equipment 3, consequently reduced the equipment size of using first cooling tower cooling alone to a certain extent, the cost is reduced.
When the gas cooling system is used for the air separation system, because the air separation system generally has dirty nitrogen pipeline 9, for further utilization of energy, the gas cooling system includes second cooling tower 10, water route and dirty nitrogen pipeline 9, second cooling tower 10 and water route intercommunication, dirty nitrogen pipeline and second cooling tower 10 intercommunication, dirty nitrogen temperature in the dirty nitrogen pipeline is less than fluid temperature in the water route, the water that gets into the second cooling tower absorbs the cold volume of the dirty nitrogen that gets into the second cooling tower, discharges from the bottom of second cooling tower, the second cooling tower with fourth runner 20 intercommunication. Dirty nitrogen gas carries out the heat transfer with the waterway fluid in the second cooling tower 10 in the dirty nitrogen gas pipeline 9, and this waterway fluid through the cooling gets into fourth runner 20, further cooling, then is used for with the gaseous heat transfer that gets into first cooling tower 5, provides the cooling of the gaseous of getting into first cooling tower 5. The water used for cooling the gas in the first cooling tower is cooled for the first time in the second cooling tower and the waste nitrogen gas, the second cooling is carried out in the second heat exchange equipment 25, the fluid after the second cooling can cool the gas in the first cooling tower to a lower temperature, so that the temperature required by the gas cooling system is further met, and therefore the gas can directly enter the molecular sieve 6 for filtering and is prepared to enter the next separation flow. The refrigerating unit that traditional gas cooling system needs has so been cancelled, simultaneously because the fluid is through the secondary cooling, so the heat transfer cold volume of second cooling tower equipment also can be moderate, has reduced the equipment size of simply using the cooling of second cooling tower to a certain extent, the cost is reduced.
The first cooling tower 5 is a spray tower, the regenerator 4 is a spray tower, and the second cooling tower 10 is a spray tower.
Wherein, the fluid outlet of the first cooling tower 5 is communicated with the circulating water 8, the fluid inlet of the second cooling tower is communicated with the circulating water 8, and the third flow channel 19 is communicated with the circulating water 8. The gas cooling system 100 further comprises a first control valve 13 and a second control valve 11, the first control valve 13 is connected between the circulating water 8 and the inlet of the fourth flow channel 20, and the first control valve 13 is controllable to regulate the flow of the fluid from the circulating water 8 into the fourth flow channel 20. A second control valve 11 is connected between the fluid outlet of the second cooling tower and the inlet of the fourth flow passage 20, and the second control valve 11 is controllable to regulate the flow of fluid from the fluid outlet of the second cooling tower into the fourth flow passage 20.
It should be noted that the first heat exchange device 3 may also have other flow channels than the first flow channel and the second flow channel. The term "communication" as used herein includes the case where a valve or the like is opened to communicate with a system in the presence of the valve or the like.
The gas cooling method of the gas cooling system includes:
inputting the air compressed by the compressor 2 into the first heat exchange equipment 3, and performing heat exchange between the air and the salt solution in the first heat exchange equipment 3 to cool the air;
the cooled air enters a first cooling tower 5 to be further cooled for standby;
inputting the salt solution in the first heat exchange device 3 into a regenerator 4, supplying air to the regenerator 4, absorbing water in the salt solution in the regenerator 4 by the air, and discharging the air absorbing the water in the salt solution out of the regenerator 4;
the salt solution leaving the regenerator 4 is decompressed and enters a second heat exchange device 25, the salt solution absorbs water vapor and then enters the first heat exchange device 3 to circularly flow, and the second heat exchange device 25 provides cold fluid for the first cooling tower 5 to cool air.
Wherein, the salt solution that leaves from regenerator 4 reduces the pressure and gets into second heat exchange equipment 25, and the salt solution gets into first heat exchange equipment 3 after absorbing vapor, includes:
the salt solution enters the first cavity 14 of the second heat exchange device 25, and the salt solution exchanges heat with the fluid in the third flow channel 19;
supplying water to the second chamber 15; the water in the second cavity 15 evaporates and absorbs heat under negative pressure, absorbs heat of the fluid in the fourth flow channel 20, and turns into water vapor;
the water vapor in the second cavity 15 flows to the first cavity 14, and the low-concentration salt solution in the first cavity 14 is input to the first heat exchange device 3.
By the gas cooling method, the heat of the high-temperature and high-pressure gas from the compressor 2 can be utilized, and the cold fluid is provided for the first cooling tower through the first heat exchange device, the regenerator and the second heat exchange device, and the temperature of the cold fluid prepared by the gas cooling method can still have lower temperature after the gas cooling system runs for a long time, so that the prepared cold fluid has better stability.
As another embodiment, referring to fig. 2, fig. 2 illustrates a schematic diagram of a system 200. The gas cooling system 200 comprises a compressor 2, a first heat exchange device 3, a regenerator 4, a first cooling tower 5, a second heat exchange device 25, a third heat exchange device 24 and a second cooling tower 10. The component structures of the compressor 2, the first heat exchange device 3, the regenerator 4, the first cooling tower 5, the second heat exchange device 25 and the second cooling tower 10 can refer to the above description.
The third heat exchange device 24 at least has a first heat exchange channel 241 and a second heat exchange channel 242, the first heat exchange channel 241 is communicated with the regenerator 4, the first heat exchange channel 241 is communicated with the first cavity 14, the second heat exchange channel 242 is communicated with the second flow channel 32 of the first heat exchange device 3, and the second heat exchange channel 242 is communicated with the first cavity 14.
In the present embodiment, the outlet of the gas supply device 1 is communicated with the inlet of the compressor 2, the outlet of the compressor 2 is communicated with the inlet of the first flow channel 31 of the first heat exchange device 3, the outlet of the first flow channel 31 of the first heat exchange device 3 is communicated with the gas inlet of the first cooling tower 5, and the gas outlet of the first cooling tower 5 is communicated with the inlet of the molecular sieve 6. The outlet of the second flow channel 32 of the first heat exchange means 3 communicates with the fluid inlet of the regenerator 4 and the fluid outlet of the regenerator 4 communicates with the inlet of the first heat exchange channel 241 of the third heat exchange means 24. The outlet of the first heat exchange channel 241 of the third heat exchange device 24 is communicated with the inlet of the pressure reducing device 16, the outlet of the pressure reducing device 16 is communicated with the first inlet 25a of the second heat exchange device 25, the first outlet of the second heat exchange device 25 is communicated with the inlet of the second heat exchange channel 242 of the third heat exchange device 24, the outlet of the second heat exchange channel 242 is communicated with the inlet of the first pump 18, and the outlet of the first pump 18 is communicated with the second flow channel of the first heat exchange device 3. The gas inlet 4a of the regenerator 4 is in communication with an air conduit 17 and the top of the regenerator 4 has a gas outlet 4 b.
The second heat exchange means 25 has a first inlet 25a and a second inlet 25b, said first inlet 25a communicating with said first chamber 14, said second inlet 25b communicating with said second chamber 15, said first inlet 25a being located at a higher level than the dividing wall. The first inlet 25a communicates with the fluid outlet of the regenerator 4. The second inlet 25b is a waterway inlet, which may be supplied with outside water. The first chamber 14 communicates with the second chamber 15 in a region above the partition wall of the second heat exchange means 25. The partition wall has a function of partitioning the first chamber and the second chamber, and if the first chamber and the second chamber are communicated through the hole provided in the partition wall as an integral part, the portion provided with the hole does not belong to the partition wall described herein, even if the portion is an integral structure with the partition wall, and the partition wall is a portion that separates the first chamber and the second chamber.
The outlet of the fourth flow passage 20 is communicated with the inlet of the second pump 7, the outlet of the second pump 7 is communicated with the second inlet of the first cooling tower 5, and the second outlet of the first cooling tower 5 is communicated with the circulating water 8. The second chamber 15 communicates with the inlet pipe 12. The dirty nitrogen line 9 communicates with a second cooling tower 10. The circulating water 8 is communicated with a second inlet of the second cooling tower 10. The fluid outlet of the second cooling tower 10 communicates with the inlet of a second control valve 11.
In the present embodiment, the salt solution is a lithium bromide solution, so that air enters the compressor 2 through the air supply device 1 to be in a high-temperature and high-pressure state, enters the first heat exchange device 3, is cooled to a low-temperature state after being absorbed by the low-concentration lithium bromide solution from the first pump 18, enters the first cooling tower 5, is contacted with the low-temperature aqueous solution from the second pump 7 for heat exchange, is cooled again and cleaned, and then enters the molecular sieve 6 in a low-temperature state. In the first heat exchange device 3, the low-concentration lithium bromide solution after absorbing heat enters the regenerator 4 and contacts with the air from the air pipeline 17, the water in the high-temperature low-concentration lithium bromide solution is absorbed by the air from the air pipeline 17 to become a high-temperature high-concentration lithium bromide solution, and the high-temperature high-concentration lithium bromide solution exchanges heat with the low-temperature low-concentration lithium bromide solution from the first cavity 14 in the third heat exchange device 24 to reduce the temperature, and then enters the first cavity 14 after being decompressed by the decompressor 16. In the regenerator 4, the air having absorbed moisture flows out from the top of the regenerator 4. In the first chamber 14, the high-concentration lithium bromide solution absorbs the water from the second chamber 15 to become a low-concentration lithium bromide solution, and is cooled by the water in the third flow channel 19 to become a low-temperature low-concentration lithium bromide solution, and then enters the third heat exchange device 24 to be heated, and then enters the first pump 18 to be pressurized and then enters the first heat exchange device 3. And the water in the circulating water 8 enters the third flow channel 19 to absorb the heat of the low-concentration lithium bromide solution, and returns to the circulating water 8 after the temperature is raised. In the second chamber 15, water enters the second chamber 15 from the water inlet pipe 12, the water entering from the water inlet pipe 12 evaporates under negative pressure, the heat of the water solution in the fourth flow channel 20 is absorbed to become gaseous, the gaseous water enters the first chamber 14 from the second chamber, and the gaseous water is absorbed by the high-concentration lithium bromide solution in the first chamber 14, so that the high-concentration lithium bromide solution becomes the low-concentration lithium bromide solution. The water in the fourth flow passage 20 absorbs heat and then is cooled to become low-temperature chilled water. The cryogenically chilled water may be used for precooling of air in an air separation system.
In order to further reduce the temperature of the water entering the fourth flow channel 20 of the first cooling tower 5, the gas cooling system may further include a dirty nitrogen gas pipeline, the dirty nitrogen gas is provided by the dirty nitrogen gas pipeline and enters the second cooling tower 10, the first control valve 13 is closed, the second control valve 11 is opened, the normal temperature water enters the second cooling tower 10 from the circulating water 8, is cooled to the intermediate temperature state by the dirty nitrogen gas from the dirty nitrogen gas pipeline 9, enters the fourth flow channel 20 through the second control valve 11, is cooled and then enters the first cooling tower 5 through the second pump 7, is cleaned and cooled, and then enters the circulating water 8 after being discharged from the bottom of the first cooling tower.
This embodiment is provided with third indirect heating equipment, effectively utilizes regenerator export high temperature high concentration salt solution's heat heating low temperature low concentration salt solution, reduces energy loss.
Referring to fig. 3, as another embodiment, the second heat exchange device 25 has a first heat exchanger 26, a second heat exchanger 27, and a pipeline, the first heat exchanger 26 is provided with the third flow channel 19 and the first chamber 14, the second heat exchanger 27 is provided with the fourth flow channel 20 and the second chamber 15, and the first chamber 14 and the second chamber 15 are communicated through the pipeline.
The second heat exchanger 25 is under negative pressure, so that water can evaporate under negative pressure to absorb heat from the fluid in the second chamber 15, and the water evaporates to become water vapor which enters the first heat exchanger 26 through the pipeline.
The fluid working process of this embodiment is substantially similar to that of the first embodiment, and is not described herein again.
It should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that various combinations, modifications and equivalents of the present invention can be made by those skilled in the art, and all technical solutions and modifications thereof without departing from the spirit and scope of the present invention are encompassed by the claims of the present invention.
Claims (10)
1. A gas cooling system comprises a compressor, a first heat exchange device, a regenerator, a first cooling tower and a second heat exchange device,
the first heat exchange device at least comprises a first flow channel and a second flow channel, the compressor is communicated with the first flow channel, and the first flow channel is communicated with the first cooling tower; the second flow passage is communicated with the regenerator;
the second heat exchange equipment at least comprises a third flow channel, a first cavity, a fourth flow channel and a second cavity, fluid in the third flow channel is in heat exchange with fluid in the first cavity, fluid in the fourth flow channel is in heat exchange with fluid in the second cavity, the first cavity can be communicated with the second cavity, the regenerator is communicated with the first cavity, and the first cavity is communicated with the second flow channel; the fourth flow passage is communicated with the first cooling tower.
2. The gas cooling system of claim 1, wherein: the gas cooling system comprises an air pipeline, the regenerator is provided with a gas inlet and a gas outlet, the gas inlet is communicated with the air pipeline, the gas outlet is communicated with the external atmosphere, air flows in the air pipeline, and the regenerator is an open device.
3. A gas cooling system according to claim 1 or 2, characterized in that: the second heat exchange device is provided with a shell and a partition wall, the partition wall is connected with the bottom of the shell, the third flow channel and the fourth flow channel are positioned on two sides of the partition wall, and the first cavity and the second cavity are communicated above the partition wall;
the second heat exchange device has a first inlet in communication with the first chamber and a second inlet in communication with the second chamber.
4. A gas cooling system according to claim 1 or 2, characterized in that: the second heat exchange equipment is provided with a first heat exchanger, a second heat exchanger and a pipeline, the first heat exchanger is provided with the third flow channel and the first cavity, the second heat exchanger is provided with the fourth flow channel and the second cavity, and the first cavity is communicated with the second cavity through the pipeline.
5. A gas cooling system according to claim 1 or 2, characterized in that: the gas cooling system comprises a pressure reducing device, the pressure reducing device is connected between the regenerator and the second heat exchange equipment, and the pressure in the regenerator is greater than the pressure in the second heat exchange equipment.
6. A gas cooling system according to claim 1 or 2, characterized in that: the gas cooling system comprises a third heat exchange device, the third heat exchange device is at least provided with a first heat exchange channel and a second heat exchange channel, the first heat exchange channel is communicated with the regenerator, the first heat exchange channel is communicated with the first cavity, the second heat exchange channel is communicated with the second flow channel, and the second heat exchange channel is communicated with the first cavity.
7. A gas cooling system according to claim 1 or 2, characterized in that: the gas cooling system comprises a second cooling tower, a water channel and a waste nitrogen pipeline, the temperature of the waste nitrogen in the waste nitrogen pipeline is lower than the temperature of fluid in the water channel, the fluid in the water channel entering the second cooling tower absorbs the cold energy of the waste nitrogen, and the second cooling tower is communicated with the fourth flow channel.
8. A gas cooling system according to claim 1 or 2, characterized in that: the fluid in the first flow channel is air, the fluid in the second flow channel is a lithium bromide solution, a lithium chloride solution, a lithium nitrate salt solution, a calcium chloride salt solution, a potassium formate salt solution and an alkyl imidazole ionic liquid aqueous solution, the fluid in the third flow channel is water or an aqueous solution, and the fluid in the fourth flow channel is water or an aqueous solution.
9. A gas cooling method comprising:
inputting air compressed by a compressor into first heat exchange equipment, and carrying out heat exchange between the air and a salt solution in the first heat exchange equipment to cool the air;
the cooled air enters a first cooling tower to be further cooled for standby;
inputting the salt solution in the first heat exchange equipment into a regenerator, supplying air to the regenerator, absorbing water in the salt solution by the air in the regenerator, and discharging the air absorbing the water in the salt solution out of the regenerator;
and decompressing the salt solution leaving from the regenerator, allowing the salt solution to enter a second heat exchange device, allowing the salt solution to enter the first heat exchange device after absorbing water vapor, and allowing the salt solution to circularly flow, wherein the second heat exchange device provides cold fluid for the first cooling tower for cooling air.
10. A gas cooling method according to claim 9, characterized in that: the brine solution that leaves from the regenerator is decompressed and enters the second heat exchange equipment, and the brine solution absorbs water vapor and then enters the first heat exchange equipment, and the method comprises the following steps:
enabling the salt solution to enter a first cavity of the second heat exchange device, and enabling the salt solution to exchange heat with fluid in the third flow channel;
providing water to the second chamber; the water in the second cavity is evaporated under negative pressure to absorb heat, and the heat of the fluid in the fourth flow channel is absorbed to be changed into water vapor;
the water vapor in the second chamber flows to the first chamber.
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| CN106642991A (en) * | 2015-10-30 | 2017-05-10 | 河南晋开化工投资控股集团有限责任公司 | Air separation pre-cooling system |
| CN107449301A (en) * | 2017-08-21 | 2017-12-08 | 江苏卓达信息科技有限公司 | The chilldown system of natural gas liquefaction device |
| CN107940801B (en) * | 2017-10-23 | 2019-07-23 | 浙江大学 | A kind of space division system recycling compressed air waste-heat |
| CN108036585B (en) * | 2018-01-07 | 2024-03-05 | 中国科学院工程热物理研究所 | Heat pump air separation system for LNG cold energy utilization |
| CN209386683U (en) * | 2018-11-24 | 2019-09-13 | 王征 | Gas system |
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