CN213687515U - Air separation system reheat structure - Google Patents
Air separation system reheat structure Download PDFInfo
- Publication number
- CN213687515U CN213687515U CN202022683179.9U CN202022683179U CN213687515U CN 213687515 U CN213687515 U CN 213687515U CN 202022683179 U CN202022683179 U CN 202022683179U CN 213687515 U CN213687515 U CN 213687515U
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- heat exchanger
- pressure heat
- pipeline
- communicated
- rectifying tower
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Classifications
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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
- F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
- F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
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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
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
- F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
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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
- F25J3/04406—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 using a dual pressure main column system
- F25J3/04412—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 using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
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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
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04812—Different modes, i.e. "runs" of operation
- F25J3/04824—Stopping of the process, e.g. defrosting or deriming; Back-up procedures
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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
- F25J2245/00—Processes or apparatus involving steps for recycling of process streams
- F25J2245/40—Processes or apparatus involving steps for recycling of process streams the recycled stream being air
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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)
- Drying Of Gases (AREA)
Abstract
The utility model discloses an air separation system reheat structure, including air compressor machine, molecular sieve, refrigeration expander, low pressure heat exchanger, high pressure heat exchanger, rectifying column, communicating pipe and self-circulating pipe. The utility model discloses a pipeline draws low pressure air to choke valve rear end pipeline all the way from the molecular sieve back, when air separation system is reheat, closes the choke valve. The pipeline and the rectifying tower at the rear end of the throttle valve are heated and reheated by using low-pressure air, so that the condition that the temperature cannot completely reach more than 0 ℃ due to the throttling refrigeration effect of the high-pressure air is thoroughly avoided, and meanwhile, the booster pump performs self-circulation to reheat and heat the high-pressure heat exchanger. The reheating structure can not only thoroughly remove moisture and carbon dioxide in the cold box and improve the heat exchange effect of each heat exchanger and the separation effect of the rectifying tower, but also has the advantages of simple operation, energy saving and the like.
Description
The technical field is as follows:
the utility model relates to an air separation system reheat structure belongs to the air separation equipment field.
Background art:
the air separation system is a gas separation system which liquefies, rectifies and finally separates air into oxygen, nitrogen and other useful gases, the air separation system comprises an air compressor, a molecular sieve, a refrigeration expander, a low-pressure heat exchanger, a high-pressure heat exchanger and a rectifying tower, air compressed by the air compressor enters the molecular sieve to remove carbon dioxide and water in the air, and then one path of air treated by the molecular sieve is expanded to 40KPa, -180- & gt 173 ℃ through the refrigeration expander and then is sent into the rectifying tower to provide cold energy for the whole system; sending the low-temperature nitrogen separated by the rectifying tower into a low-pressure heat exchanger, and cooling the other path of air which is treated by a molecular sieve and has the pressure of 0.5 MPa; the low-temperature oxygen separated from the rectifying tower is sent into a high-pressure heat exchanger, the other path of the low-temperature oxygen is subjected to molecular sieve treatment, and the temperature of the air is reduced to 6.5MPa (the purpose of boosting is to take away heat in liquid oxygen as much as possible to gasify the liquid oxygen, and the effect of throttling and refrigerating the air at a throttling valve after temperature reduction is enhanced on the other hand), the reduced-temperature air is throttled to 0.5MPa by the throttling valve, and the two paths of the reduced-temperature air finally enter the rectifying tower to be expanded and refrigerated, and are rectified and separated.
Because a small amount of moisture and carbon dioxide still remain in the air after the air is treated by the molecular sieve and are frozen in the low-pressure heat exchanger, the high-pressure heat exchanger and the rectifying tower in the operation process of the air separation system, the heat exchange efficiency is influenced, so that the air separation system needs to be reheated and heated within a certain time to melt the frozen moisture and carbon dioxide. The traditional reheating mode is only to close a refrigeration expander without additionally increasing cold quantity, the space-time flow is adopted for reheating, normal-temperature gas which is not subjected to refrigeration expansion enters a rectifying tower, the gas is discharged from a nitrogen outlet and an oxygen outlet without being separated and respectively enters a low-pressure heat exchanger and a high-pressure heat exchanger, the cold quantity in equipment and pipelines is taken away, and the reheating is realized.
However, an air compressor and a supercharger of an air separation system are generally coaxially driven by a steam turbine, the supercharger cannot be stopped during reheating, the gas temperature at the rear end of the throttle valve is always below 0 ℃ due to the existence of the throttle valve, and a pipeline at the rear end of the throttle valve and a tower tray of a rectifying tower cannot be reheated to above 0 ℃, so that the deicing is incomplete, the reheating effect is poor, and the reheating requirement is difficult to meet.
The utility model has the following contents:
in order to solve the technical problem, an object of the utility model is to provide an air separation system reheat structure that reheat is effectual, the deicing is thorough.
The utility model discloses by following technical scheme implement: a reheating structure of an air separation system comprises an air compressor, a molecular sieve, a refrigeration expander, a low-pressure heat exchanger, a high-pressure heat exchanger and a rectifying tower, wherein an outlet of the air compressor is communicated with an inlet of the molecular sieve through a pipeline, and an outlet of the molecular sieve is respectively communicated with an inlet of the refrigeration expander, a heat medium inlet of the low-pressure heat exchanger and a heat medium inlet of the high-pressure heat exchanger through pipelines; a supercharger is arranged on a pipeline communicated between the molecular sieve and the high-pressure heat exchanger, and a throttle valve is arranged on a pipeline communicated between the high-pressure heat exchanger and the rectifying tower; an outlet of the refrigeration expansion machine, a hot medium outlet of the low-pressure heat exchanger and a hot medium outlet of the high-pressure heat exchanger are communicated with an inlet of the rectifying tower through pipelines, a top outlet of the rectifying tower is communicated with a cold medium inlet of the low-pressure heat exchanger through a pipeline, and a middle outlet of the rectifying tower is communicated with a cold medium inlet of the high-pressure heat exchanger through a pipeline;
the device also comprises a communicating pipe, one end of the communicating pipe is communicated with a pipeline connecting the molecular sieve and the low-pressure heat exchanger, the other end of the communicating pipe is communicated with a pipeline connecting the throttling valve and the rectifying tower, and a communicating valve is arranged on the communicating pipe.
Further, it still includes from the circulating pipe, from the one end of circulating pipe with the intercommunication high pressure heat exchanger with pipeline intercommunication between the choke valve, from the other end of circulating pipe with the intercommunication the molecular sieve with pipeline intercommunication between the booster compressor be equipped with the self-circulation valve on the circulating pipe.
The utility model has the advantages that: the utility model discloses a pipeline draws low pressure air to choke valve rear end pipeline all the way from the molecular sieve back, when air separation system is reheat, closes the choke valve. The pipeline and the rectifying tower at the rear end of the throttle valve are heated and reheated by using low-pressure air, so that the condition that the temperature cannot completely reach more than 0 ℃ due to the throttling refrigeration effect of the high-pressure air is thoroughly avoided, and meanwhile, the booster pump performs self-circulation to reheat and heat the high-pressure heat exchanger. The reheating structure can not only thoroughly remove moisture and carbon dioxide in the cold box and improve the heat exchange effect of each heat exchanger and the separation effect of the rectifying tower, but also has the advantages of simple operation, energy saving and the like.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the utility model relates to an air separation system reheat structure's schematic diagram.
In the figure: the device comprises an air compressor 1, a molecular sieve 2, a refrigeration expander 3, a low-pressure heat exchanger 4, a high-pressure heat exchanger 5, a rectifying tower 6, a supercharger 7, a throttle valve 8, a communicating pipe 9, a self-circulating pipe 10, a communicating valve 11 and a self-circulating valve 12.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A kind of air separation system reheat structure, it includes air compressor 1, molecular sieve 2, refrigerate the expander 3, low-pressure heat exchanger 4, high-pressure heat exchanger 5, rectifying column 6, the outlet port of the air compressor 1 communicates with import of the molecular sieve 2 through the pipeline, the outlet port of the molecular sieve 2 communicates with import of the refrigerate expander 3, hot medium inlet of the low-pressure heat exchanger 4, hot medium inlet of the high-pressure heat exchanger 5 through the pipeline separately; a booster 7 is also arranged on a pipeline communicated between the molecular sieve 2 and the high-pressure heat exchanger 5, and a throttle valve 8 is arranged on a pipeline communicated between the high-pressure heat exchanger 5 and the rectifying tower 6; an outlet of the refrigeration expansion machine 3, a heat medium outlet of the low-pressure heat exchanger 4 and a heat medium outlet of the high-pressure heat exchanger 5 are communicated with an inlet of the rectifying tower 6 through pipelines, a top outlet of the rectifying tower 6 is communicated with a cold medium inlet of the low-pressure heat exchanger 4 through a pipeline, and a middle outlet of the rectifying tower 6 is communicated with a cold medium inlet of the high-pressure heat exchanger 5 through a pipeline;
the device also comprises a communicating pipe 9 and a self-circulating pipe 10, wherein one end of the communicating pipe 9 is communicated with a pipeline connecting the molecular sieve 2 and the low-pressure heat exchanger 4, the other end of the communicating pipe 9 is communicated with a pipeline connecting the throttling valve 8 and the rectifying tower 6, and the communicating pipe 9 is provided with a communicating valve 11; one end of a self-circulation pipe 10 is communicated with a pipeline communicated between the high-pressure heat exchanger 5 and the throttle valve 8, the other end of the self-circulation pipe 10 is communicated with a pipeline communicated between the molecular sieve 2 and the supercharger 7, and a self-circulation valve 12 is arranged on the self-circulation pipe 10.
The working process is as follows:
1. and (3) air separation flow:
the gas with the moisture and the carbon dioxide removed by the molecular sieve 2 is divided into three paths and enters a rectifying tower 6, the first path is expanded by a refrigeration expander 3 and then cooled to minus 180-173 ℃, the gas enters the rectifying tower 6 for rectification, nitrogen with the temperature of minus 195 ℃ produced at the top is sent to a low-pressure heat exchanger 4 to exchange heat with the second path of gas, the second path of gas enters the rectifying tower 6 after exchanging heat to minus 173 ℃, liquid oxygen with the temperature of minus 183 ℃ at the bottom of the rectifying tower 6 enters a high-pressure heat exchanger 5 to exchange heat with the third path of gas after being pressurized, the third path of gas enters the rectifying tower 6 after exchanging heat to minus 153 ℃, and the gas is throttled and depressurized by a throttle valve 8 to 0.5MPa and then enters the rectifying tower 6.
2. A reheating process:
the refrigeration expander 3 is closed, the communication valve 11 and the self-circulation valve 12 are opened, and the throttle valve 8 is closed.
The gas with the moisture and carbon dioxide removed by the molecular sieve 2 is divided into three paths to enter a rectifying tower 6, then enters a low-pressure heat exchanger 4 and a high-pressure heat exchanger 5 and is discharged, the supercharger 7 cannot be stopped, the air compressed by the supercharger 7 enters the high-pressure heat exchanger 5, and then is self-circulated through a self-circulating pipe 10; the gas entering the pipeline at the rear part of the throttle valve 8 is air which is branched from the original low-pressure heat exchanger 4, the pressure of the air is not changed, the temperature of the air is not reduced, and therefore the reheating temperature rise of the whole system is achieved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A reheating structure of an air separation system comprises an air compressor, a molecular sieve, a refrigeration expander, a low-pressure heat exchanger, a high-pressure heat exchanger and a rectifying tower, wherein an outlet of the air compressor is communicated with an inlet of the molecular sieve through a pipeline, and an outlet of the molecular sieve is respectively communicated with an inlet of the refrigeration expander, a heat medium inlet of the low-pressure heat exchanger and a heat medium inlet of the high-pressure heat exchanger through pipelines; a supercharger is arranged on a pipeline communicated between the molecular sieve and the high-pressure heat exchanger, and a throttle valve is arranged on a pipeline communicated between the high-pressure heat exchanger and the rectifying tower; an outlet of the refrigeration expansion machine, a hot medium outlet of the low-pressure heat exchanger and a hot medium outlet of the high-pressure heat exchanger are communicated with an inlet of the rectifying tower through pipelines, a top outlet of the rectifying tower is communicated with a cold medium inlet of the low-pressure heat exchanger through a pipeline, and a middle outlet of the rectifying tower is communicated with a cold medium inlet of the high-pressure heat exchanger through a pipeline;
the device is characterized by further comprising a communicating pipe, wherein one end of the communicating pipe is communicated with a pipeline connected between the molecular sieve and the low-pressure heat exchanger, the other end of the communicating pipe is communicated with a pipeline connected between the throttling valve and the rectifying tower, and a communicating valve is arranged on the communicating pipe.
2. The air separation system reheating structure according to claim 1, further comprising a self-circulating pipe, wherein one end of the self-circulating pipe is communicated with a pipeline communicating between the high-pressure heat exchanger and the throttle valve, the other end of the self-circulating pipe is communicated with a pipeline communicating between the molecular sieve and the supercharger, and a self-circulating valve is arranged on the self-circulating pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022683179.9U CN213687515U (en) | 2020-11-18 | 2020-11-18 | Air separation system reheat structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022683179.9U CN213687515U (en) | 2020-11-18 | 2020-11-18 | Air separation system reheat structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213687515U true CN213687515U (en) | 2021-07-13 |
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ID=76733607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022683179.9U Active CN213687515U (en) | 2020-11-18 | 2020-11-18 | Air separation system reheat structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213687515U (en) |
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2020
- 2020-11-18 CN CN202022683179.9U patent/CN213687515U/en active Active
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