CN218973023U - Air separation system pre-cooled by regenerated gas heat exchanger - Google Patents

Air separation system pre-cooled by regenerated gas heat exchanger Download PDF

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Publication number
CN218973023U
CN218973023U CN202223453509.0U CN202223453509U CN218973023U CN 218973023 U CN218973023 U CN 218973023U CN 202223453509 U CN202223453509 U CN 202223453509U CN 218973023 U CN218973023 U CN 218973023U
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China
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gas
outlet
heat exchanger
air separation
regenerated
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CN202223453509.0U
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Chinese (zh)
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颜辉
魏凯
李可明
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Qingdao Ronghe New Material Technology Co Ltd
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Qingdao Ronghe New Material Technology Co Ltd
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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
    • 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
    • F25J3/04163—Hot end purification of the feed air
    • F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
    • F25J3/04181—Regenerating the adsorbents
    • 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
    • F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • F25J2205/04—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum in the feed line, i.e. upstream of the fractionation step
    • 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
    • F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
    • F25J2205/66—Regenerating the adsorption vessel, e.g. kind of reactivation gas
    • F25J2205/68—Cooling the adsorption vessel
    • 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
    • F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
    • F25J2205/66—Regenerating the adsorption vessel, e.g. kind of reactivation gas
    • F25J2205/70—Heating the adsorption vessel
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being nitrogen
    • 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
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/42—One fluid being nitrogen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The utility model relates to the technical field of air separation equipment, in particular to an air separation system pre-cooled by a regenerated gas heat exchanger, which comprises an air compressor, a gas purification device and a cold box, wherein a regenerated gas outlet is arranged on the cold box, an expander is arranged in the cold box, the expander is connected with the regenerated gas outlet, the air separation system further comprises a regenerated gas heat exchanger, the regenerated gas heat exchanger is provided with a refrigerant inlet, a refrigerant outlet, a heating medium inlet and a heating medium outlet, the refrigerant inlet is communicated with the regenerated gas outlet, the refrigerant outlet is communicated with the gas outlet of the gas purification device through a high-temperature pipeline, and an electric heater is arranged on the high-temperature pipeline; the heat medium inlet is communicated with the air compressor, and the heat medium outlet is communicated with the gas inlet of the gas purification device. The utility model simplifies the system device, realizes the heat exchange between the regenerated gas and the compressed air, fully utilizes the cold quantity of the regenerated gas and saves the production cost.

Description

Air separation system pre-cooled by regenerated gas heat exchanger
Technical Field
The utility model relates to the technical field of air separation equipment, in particular to an air separation system precooled by a regenerated gas heat exchanger.
Background
In the existing cryogenic air separation technology, the normal-temperature compressed air from an air compressor needs to be cooled to about 4-8 ℃ through a precooler, so that the temperature is lower than the dew point temperature, and most of moisture in the compressed air is removed. The precooled air is subjected to a molecular sieve purifier to remove the residual trace moisture and other impurities affecting the air separation and rectification. After the molecular sieve in the purifier is adsorbed and saturated, the molecular sieve in the purifier needs to be regenerated by using the regenerated gas after the air separation and rectification. The regeneration gas is an exhaust gas generated in the rectification process of the air separation rectifying tower, and the exhaust gas is used for regeneration of the purifier, so that the regeneration gas is called as regeneration gas. The regeneration of the purifier mainly uses the regenerated gas after electric heating to carry out Wen Jiexi on the molecular sieve, and then uses the regenerated gas to carry out cold blowing to recover the adsorption capacity and then continuously put into production. The regenerated gas is cooled by an expander of the cold box and then is discharged after heat exchange by a main heat exchanger, part of the cooling capacity carried by the regenerated gas is used for cooling and blowing by the purifier, and the other part of the cooling capacity is heated without being utilized to be used for the high Wen Jiexi of the purifier, so that the cooling capacity is wasted, and the cooling of the compressed air precooler needs electric energy and circulating water and needs daily maintenance.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an air separation system pre-cooled by a regenerated gas heat exchanger, wherein the regenerated gas heat exchanger is used for replacing a pre-cooler in the original air separation system, so that a system device is simplified, heat exchange between regenerated gas and compressed air is realized, the cold quantity of the regenerated gas is fully utilized, and the production cost is saved.
The utility model discloses an air separation system precooled by a regenerated gas heat exchanger, which comprises an air compressor, a gas purification device and a cold box, wherein a regenerated gas outlet is formed in the cold box, an expander is arranged in the cold box and connected with the regenerated gas outlet, the air separation system also comprises a regenerated gas heat exchanger, the regenerated gas heat exchanger is provided with a refrigerant inlet, a refrigerant outlet, a heating medium inlet and a heating medium outlet, the refrigerant inlet is communicated with the regenerated gas outlet, the refrigerant outlet is communicated with the gas outlet of the gas purification device through a high-temperature pipeline, and an electric heater is arranged on the high-temperature pipeline; the heat medium inlet is communicated with the air compressor, and the heat medium outlet is communicated with the gas inlet of the gas purification device; the device also comprises a liquid nitrogen storage tank, the liquid nitrogen storage tank is connected with the liquid nitrogen vaporizer, a low-temperature pipeline is arranged in the middle of the liquid nitrogen vaporizer, a normal-temperature pipeline is arranged at the tail of the liquid nitrogen vaporizer, the low-temperature pipeline is communicated with the normal-temperature pipeline, and the communicating pipeline is connected with the refrigerant inlet.
The gas purification device comprises at least two parallel purifiers so as to alternately perform the purification and regeneration procedures.
The refrigerant outlet is connected with the silencing and emptying device.
An automatic drain valve is arranged on a communication pipeline between a heat medium inlet and a heat medium outlet of the regenerated gas heat exchanger so as to regularly discharge water separated out by cooling compressed air. The automatic drain valve is connected with a manual drain valve to check the drain effect.
The refrigerant outlet is connected with the high-temperature pipeline through the cold blowing pipeline, and the connecting part is positioned between the electric heater and the gas outlet of the gas purification device and is used for carrying out cold blowing on the gas purification device in the regeneration stage. The purifier is in regeneration stage, the regeneration gas temperature that heating and cold blowing need is different, so, after the regeneration gas goes out the cold box, get into the regeneration gas heat exchanger and carry out heat transfer with compressed air, then divide into two ways, the regeneration gas of one way carries out high temperature regeneration to the purifier through electric heater, the gas purification device is connected through high temperature pipeline to the other way, mainly used carries out the cold blowing to the purifier with the regeneration gas after the purifier regeneration is accomplished, and through the distribution of two way pipeline regeneration gas volume, realize the regulation of the heating and the cold blowing temperature of purifier regeneration stage, the cold volume of regeneration gas is fully utilized, the energy consumption of heating the regeneration gas has been reduced simultaneously.
The pipeline can be provided with a valve according to the control requirement, and the on-off of materials in the corresponding pipeline and the flow of the materials are conveniently controlled through the opening and closing of the valve.
The cooling capacity of the regenerated gas reduces the temperature of the compressed air on one hand, and the purifier is blown to the working temperature by cold blowing on the other hand, because the cooling capacity required by the compressed air reduced to 4-8 ℃ from normal temperature is not large, and the refrigerating capacity of the expander of the cold box is quite rich, the temperature of the regenerated gas coming out of the cold box is reduced during air separation design, and the functions can be realized.
The compressed air compressed by the air compressor exchanges heat with the regenerated gas, the temperature is reduced to remove most of water, the next step is fed into the purifier to further remove impurities, and the purified qualified compressed air enters the cold box to participate in the air separation and rectification process.
In the air separator stage, no low-temperature regenerated gas is generated, and the low-temperature nitrogen gasified by liquid nitrogen is used for replacing the low-temperature regenerated gas. The liquid nitrogen vaporizer is used for converting liquid nitrogen into nitrogen gas and heating the liquid nitrogen to normal temperature through air. In order to adjust the temperature of nitrogen, a low-temperature pipeline with lower temperature and incomplete room temperature and a normal-temperature pipeline at the tail part of the other liquid nitrogen vaporizer are introduced from the middle part of the liquid nitrogen vaporizer, so that the low-temperature nitrogen and the normal-temperature nitrogen are mixed, the temperature of the nitrogen is adjusted by adjusting the gas quantity in the two pipelines through a valve, and the nitrogen with qualified temperature enters a regenerated gas heat exchanger to exchange heat with compressed air.
Compared with the prior art, the utility model has the beneficial effects that: the pre-cooler in the original air separation system is replaced by the regenerated gas heat exchanger, so that the energy consumption is reduced, the system device is simplified, the regenerated gas exchanges heat with the compressed air, the cold energy of the regenerated gas is fully utilized, the cold energy after the liquid nitrogen is gasified is recycled, and the production cost is saved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
in the figure: 1. a cold box; 2. a regeneration gas outlet; 3. a regeneration gas heat exchanger; 4. a refrigerant inlet; 5. a refrigerant outlet; 6. a heating medium inlet; 7. a heating medium outlet; 8. an electric heater; 9. a liquid nitrogen storage tank; 10. a liquid nitrogen vaporizer; 11. a low temperature pipeline; 12. a normal temperature pipeline; 13. a purifier; 14. a high temperature pipeline; 15. a silencing and emptying device; 16. an automatic drain valve; 17. a manual drain valve; 18. and (5) cold blowing the pipeline.
Detailed Description
The present utility model will now be described more fully hereinafter with reference to the accompanying drawings.
It should be noted that relational terms such as first and second are used solely to distinguish one entity or action from another entity or action to facilitate expression and not to represent a sequential relationship.
As shown in fig. 1, the air separation system precooled by using a regenerated gas heat exchanger comprises an air compressor, a gas purification device and a cold box 1, wherein a regenerated gas outlet 2 is arranged on the cold box 1, an expander is arranged in the cold box 1 and is connected with the regenerated gas outlet 2, the air separation system further comprises a regenerated gas heat exchanger 3, the regenerated gas heat exchanger 3 is provided with a refrigerant inlet 4, a refrigerant outlet 5, a heat medium inlet 6 and a heat medium outlet 7, the refrigerant inlet 4 is communicated with the regenerated gas outlet 2, the refrigerant outlet 5 is communicated with a gas outlet of the gas purification device through a high-temperature pipeline 14, and an electric heater 8 is arranged on the high-temperature pipeline 14; the heat medium inlet 6 is communicated with the air compressor, and the heat medium outlet 7 is communicated with a gas inlet of the gas purification device; the device further comprises a liquid nitrogen storage tank 9, the liquid nitrogen storage tank 9 is connected with a liquid nitrogen vaporizer 10, a low-temperature pipeline 11 is arranged in the middle of the liquid nitrogen vaporizer 10, a normal-temperature pipeline 12 is arranged at the tail of the liquid nitrogen vaporizer 10, the low-temperature pipeline 11 is communicated with the normal-temperature pipeline 12, and the communicating pipeline is connected with the refrigerant inlet 4.
The gas purification device comprises at least two purifiers 13 connected in parallel.
The refrigerant outlet 5 is connected with a silencing and emptying device 15.
An automatic drain valve 16 is arranged on a communication pipeline between the heat medium inlet 6 and the heat medium outlet 7 of the regenerated gas heat exchanger 3.
The automatic drain valve 16 is connected to a manual drain valve 17.
The refrigerant outlet 5 is connected with the high-temperature pipeline 14 through the cold blowing pipeline 18, and the connection part is positioned between the electric heater 8 and the gas outlet of the gas purifying device.
The working process is as follows: in the air separation machine stage, nitrogen is regulated to a proper temperature by adjusting nitrogen flow of different temperatures in a low-temperature pipeline 11 and a normal-temperature pipeline 12 on a liquid nitrogen vaporizer 10, and then is sent to a regenerated gas heat exchanger 3 to exchange heat with compressed air to remove most of water, and then enters a gas purification device to further remove impurities, and the purified qualified compressed air enters a cold box 1 to participate in the air separation rectification process;
after the air separator works normally, the regenerated gas is produced, the compressed air compressed by the air compressor exchanges heat with the regenerated gas through the regenerated gas heat exchanger 3, the temperature is reduced to remove most of water, the next step is fed into the gas purification device to further remove impurities, and the purified qualified compressed air enters the cold box 1 to participate in the air separation rectification process;
in the regeneration stage of the purifier 13, the regenerated gas after heat exchange with the compressed air is discharged from the refrigerant outlet 5, enters the purifier 13 after being heated by the electric heater 8 on the high-temperature pipeline 14, carries out high-temperature regeneration on the purifier 13, and then enters the purifier 13 for cold blowing by adjusting the air quantity of the cold blowing pipeline 18 entering the high-temperature pipeline 14 and the cold blowing regenerated gas adjusted to a proper temperature.

Claims (6)

1. The air separation system pre-cooled by utilizing the regenerated gas heat exchanger comprises an air compressor, a gas purification device and a cold box (1), wherein a regenerated gas outlet (2) is formed in the cold box (1), an expander is arranged in the cold box (1) and is connected with the regenerated gas outlet (2), and the air separation system is characterized by further comprising the regenerated gas heat exchanger (3), the regenerated gas heat exchanger (3) is provided with a refrigerant inlet (4), a refrigerant outlet (5), a heating medium inlet (6) and a heating medium outlet (7), the refrigerant inlet (4) is communicated with the regenerated gas outlet (2), the refrigerant outlet (5) is communicated with a gas outlet of the gas purification device through a high-temperature pipeline (14), and an electric heater (8) is arranged on the high-temperature pipeline (14); the heat medium inlet (6) is communicated with the air compressor, and the heat medium outlet (7) is communicated with the gas inlet of the gas purification device; still include liquid nitrogen storage tank (9), liquid nitrogen storage tank (9) connect liquid nitrogen vaporizer (10), and liquid nitrogen vaporizer (10) middle part is equipped with low temperature pipeline (11), and liquid nitrogen vaporizer (10) afterbody is equipped with normal atmospheric temperature pipeline (12), and low temperature pipeline (11) are linked together with normal atmospheric temperature pipeline (12) and its communicating pipe way is connected with refrigerant entry (4).
2. Air separation system pre-cooled by means of a regeneration gas heat exchanger according to claim 1, characterized in that the gas purification means comprise at least two purifiers (13) connected in parallel.
3. The air separation system pre-cooled by a regeneration gas heat exchanger according to claim 1, wherein the refrigerant outlet (5) is connected to a silencing and emptying device (15).
4. The air separation system pre-cooled by the regeneration gas heat exchanger according to claim 1, wherein an automatic drain valve (16) is arranged on a communication pipeline of the heat medium inlet (6) and the heat medium outlet (7) of the regeneration gas heat exchanger (3).
5. The air separation system pre-cooled by a regeneration gas heat exchanger according to claim 4, wherein an automatic drain valve (16) is connected to a manual drain valve (17).
6. The air separation system pre-cooled by a regeneration gas heat exchanger according to claim 1, wherein the refrigerant outlet (5) is connected to the high temperature pipe (14) through a cold blowing pipe (18), and the connection is located between the electric heater (8) and the gas outlet of the gas purification device.
CN202223453509.0U 2022-12-23 2022-12-23 Air separation system pre-cooled by regenerated gas heat exchanger Active CN218973023U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202223453509.0U CN218973023U (en) 2022-12-23 2022-12-23 Air separation system pre-cooled by regenerated gas heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202223453509.0U CN218973023U (en) 2022-12-23 2022-12-23 Air separation system pre-cooled by regenerated gas heat exchanger

Publications (1)

Publication Number Publication Date
CN218973023U true CN218973023U (en) 2023-05-05

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