CN220541529U - Energy-saving rewarming system of air separation device - Google Patents
Energy-saving rewarming system of air separation device Download PDFInfo
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- CN220541529U CN220541529U CN202321550760.0U CN202321550760U CN220541529U CN 220541529 U CN220541529 U CN 220541529U CN 202321550760 U CN202321550760 U CN 202321550760U CN 220541529 U CN220541529 U CN 220541529U
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- Prior art keywords
- air separation
- air
- rewarming
- heat exchanger
- valve
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- 238000000926 separation method Methods 0.000 title claims abstract description 60
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002808 molecular sieve Substances 0.000 claims abstract description 36
- 238000004891 communication Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000011084 recovery Methods 0.000 abstract description 13
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000618 nitrogen fertilizer Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
- F25J3/04951—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network
- F25J3/04957—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network and inter-connecting equipments upstream of the fractionation unit (s), i.e. at the "front-end"
-
- 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
Landscapes
- 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 provides an energy-saving re-heating system of an air separation device, which comprises at least two sets of air separation re-heating units and a communication pipeline for communicating the sets of air separation re-heating units; the energy-saving re-heating system of the air separation device is characterized by comprising at least two sets of air separation re-heating units and a communication pipeline for communicating the sets of air separation re-heating units; and the exhaust port of any set of the molecular sieve of the air separation and temperature recovery unit is communicated with the exhaust ports of the molecular sieves of other sets of the air separation and temperature recovery units through the communicating pipe. According to the energy-saving rewarming system for the air separation device, provided by the utility model, a plurality of sets of air compressors can be stopped in advance when the system is stopped for rewarming after the pipelines are communicated with each other, compressed air of other units is used for being connected into the system in series for rewarming the rectifying tower, and the steam consumption is saved within 48-72 hours after the system is stopped for rewarming; the unit can be disassembled and inspected 48 hours in advance during maintenance; therefore, steam consumption is saved and the overhaul time of the unit is prolonged.
Description
Technical Field
The utility model belongs to the technical field of air devices, and particularly relates to an energy-saving rewarming system of an air separation device.
Background
The air separation device is equipment for gradually separating and producing oxygen, nitrogen, argon and other gases from liquid air by using air as a raw material through a compression circulation deep freezing and rectifying method, and is widely applied to the fields of metallurgy, coal chemical industry, nitrogen fertilizer and the like.
Before the air separation device is stopped, the temperature in the rectifying tower is extremely low and is about-170 ℃, so that the rectifying tower needs to be rewarmed to the room temperature, and then the air separation device can be stopped. Otherwise, the internal structure of the rectifying tower is easy to freeze or damage.
At present, when two or more sets of air separation devices are configured, each set of air separation device operates independently, so that before each set of air separation device stops, the rectifying tower is rewarmed for 2-3 days, then the operation of air separation equipment such as an air compressor can be stopped, the operation time of the air separation equipment such as the air compressor is prolonged, and the energy consumption of the air separation equipment such as the air compressor is wasted; in addition, if the air separation equipment such as the air compressor needs to be overhauled, the air separation equipment such as the air compressor can not be overhauled in time after 2-3 days.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model provides an energy-saving rewarming system of an air separation device, which can effectively solve the problems.
The technical scheme adopted by the utility model is as follows:
the utility model provides an energy-saving re-heating system of an air separation device, which comprises at least two sets of air separation re-heating units and a communication pipeline for communicating the sets of air separation re-heating units;
each set of air separation rewarming unit comprises an air compressor (A1), a molecular sieve (A2), a plate heat exchanger (A3) and a rectifying tower (A4); the compressed air output port of the air compressor (A1) is communicated with the air inlet of the molecular sieve (A2); the exhaust port of the molecular sieve (A2) is communicated with the heat medium inlet of the plate heat exchanger (A3); the heat medium outlet of the plate heat exchanger (A3) is communicated with the bottom air inlet of the rectifying tower (A4); the top exhaust port of the rectifying tower (A4) is communicated with the cold medium inlet of the plate heat exchanger (A3), and the cold medium outlet of the plate heat exchanger (A3) is communicated with the atmosphere;
the exhaust port of the molecular sieve (A2) of any set of the space division rewarming unit is communicated with the exhaust ports of the molecular sieves (A2) of other sets of the space division rewarming units through the communicating pipe.
Preferably, a1 st valve is arranged at the exhaust port of the molecular sieve (A2); a2 nd valve is arranged at a heat medium outlet of the plate heat exchanger (A3); a3 rd valve is arranged at a cold medium outlet of the plate heat exchanger (A3); and the communication pipeline is provided with a control valve.
The energy-saving rewarming system of the air separation device provided by the utility model has the following advantages:
according to the energy-saving rewarming system for the air separation device, provided by the utility model, a plurality of sets of air compressors can be stopped in advance when the system is stopped for rewarming after the pipelines are communicated with each other, compressed air of other units is used for being connected into the system in series for rewarming the rectifying tower, and the steam consumption is saved within 48-72 hours after the system is stopped for rewarming; the unit can be disassembled and inspected 48 hours in advance during maintenance; therefore, steam consumption is saved and the overhaul time of the unit is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of an energy-saving and temperature-restoring system of an air separation device.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The utility model provides an energy-saving re-heating system of an air separation device, which comprises at least two sets of air separation re-heating units and a communication pipeline for communicating the sets of air separation re-heating units;
each set of air separation rewarming unit comprises an air compressor A1, a molecular sieve A2, a plate heat exchanger A3 and a rectifying tower A4; the compressed air output port of the air compressor A1 is communicated with the air inlet of the molecular sieve A2; the exhaust port of the molecular sieve A2 is communicated with the heat medium inlet of the plate heat exchanger A3; the heat medium outlet of the plate heat exchanger A3 is communicated with the bottom air inlet of the rectifying tower A4; the top exhaust port of the rectifying tower A4 is communicated with the cold medium inlet of the plate heat exchanger A3, and the cold medium outlet of the plate heat exchanger A3 is communicated with the atmosphere;
the exhaust port of the molecular sieve A2 of any set of air separation and temperature recovery unit is communicated with the exhaust ports of the molecular sieves A2 of other sets of air separation and temperature recovery units through a communication pipeline.
The exhaust port of the molecular sieve A2 is provided with a1 st valve; a2 nd valve is arranged at the heat medium outlet of the plate heat exchanger A3; a3 rd valve is arranged at the cold medium outlet of the plate heat exchanger A3; the communication pipeline is provided with a control valve.
The utility model provides an energy-saving re-heating system of an air separation device, which is applicable to at least two sets of air separation re-heating units, and an embodiment is described below by taking three sets of air separation re-heating units as an example with reference to fig. 1:
as shown in fig. 1, three sets of space division rewarming units are provided, which are respectively: the device comprises a first set of space division rewarming unit, a second set of space division rewarming unit and a third set of space division rewarming unit. The first set of air separation rewarming unit comprises an air compressor A1, a molecular sieve A2, a plate heat exchanger A3 and a rectifying tower A4; the second set of air separation rewarming unit comprises an air compressor B1, a molecular sieve B2, a plate heat exchanger B3 and a rectifying tower B4; the third set of air separation rewarming unit comprises an air compressor C1, a molecular sieve C2, a plate heat exchanger C3 and a rectifying tower C4.
The air outlet of the molecular sieve A2 of the first air separation and rewarming unit is provided with a valve 1, the heat medium outlet of the plate heat exchanger A3 is provided with a valve 2, and the cold medium outlet of the plate heat exchanger A3 is provided with a valve 3;
the air outlet of the molecular sieve B2 of the second air separation and temperature recovery unit is provided with a valve 4, the heat medium outlet of the plate heat exchanger B3 is provided with a valve 5, and the cold medium outlet of the plate heat exchanger B3 is provided with a valve 6;
the air outlet of the molecular sieve C2 of the third air separation and temperature recovery unit is provided with a valve 7, the heat medium outlet of the plate heat exchanger C3 is provided with a valve 8, and the cold medium outlet of the plate heat exchanger C3 is provided with a valve 9.
The air outlet of the molecular sieve A2 of the first set of air separation and temperature recovery unit is led out of two communication pipelines, namely a first communication pipeline and a second communication pipeline, wherein one end of the first communication pipeline is connected between the valve 1 and the valve 2, and the other end of the first communication pipeline is connected between the valve 4 and the valve 5; mounting a valve 11 and a valve 12 in the first communication line; the second communication line has one end located between the valve 11 and the valve 12 and the other end connected between the valve 7 and the valve 8, and a valve 13 is installed in the second communication line. Thus realizing the intercommunication between the exhaust ports of the molecular sieves of the three sets of air separation and temperature recovery units.
When three sets of air separation and temperature recovery units need to be stopped or stopped for maintenance, the air compressor A1 is kept to be in a working state, the air compressor B1 and the air compressor C1 can be immediately closed, the air compressor B1 and the air compressor C1 are maintained, and at the moment, each rectifying tower of the three sets of air separation and temperature recovery units adopts the following method for temperature recovery:
1) The air compressor A1 is in a working state, air enters a steam turbine driven by steam after impurities are filtered by a self-cleaning air filter, and meanwhile, the air is compressed by the air compressor A1 in the air compressor A1 dragged, and the air pressure is increased to 0.525MPa, so that compressed air is obtained;
2) The compressed air flows through a molecular sieve A2, and the molecular sieve A2 removes moisture in the air to obtain dry air;
3) The dry air is divided into three branches, the first branch enters a plate heat exchanger A3 after passing through a valve 1 and a valve 2, and after exchanging heat through the plate heat exchanger A3, a rectifying tower A4 is purged to realize the rewarming of the rectifying tower A4; the specific method comprises the following steps: the dry air flows into the plate heat exchanger A3, exchanges heat with low-temperature air discharged from the top of the rectifying tower A4, turns into low-temperature air after heat release, flows into the rectifying tower A4 from the bottom of the rectifying tower A4, is discharged from the top of the rectifying tower A4 and is discharged into the plate heat exchanger A3, and is discharged to the atmosphere through the valve 3 after heat exchange; therefore, the air output by the molecular sieve A2 continuously flows into the rectifying tower A4 after exchanging heat through the plate heat exchanger A3, and flows back to the plate heat exchanger A3 from the top of the rectifying tower A4 to be exhausted, and the circulation is continuously performed, so that the internal temperature of the rectifying tower A4 is gradually increased to rewarmed until the room temperature is reached;
the second branch passes through the valve 1, the valve 11, the valve 12 and the valve 5, then enters the plate heat exchanger B3, and after heat exchange of the plate heat exchanger B3, the rectification column B4 is purged to realize rewarming of the rectification column B4;
and the third branch passes through the valve 1, the valve 11, the valve 13 and the valve 8, then enters the plate heat exchanger C3, and after heat exchange of the plate heat exchanger C3, the rectification tower C4 is purged, so that the rewarming of the rectification tower C4 is realized.
Therefore, the utility model realizes the gas intercommunication after the molecular sieve by adding the communication pipeline after the molecular sieve, and can be used for the gas interconnection during the rewarming of the rectifying tower, thereby realizing the purpose that three sets of plate heat exchangers and the rectifying tower share one path of compressed air discharged by the molecular sieve. Therefore, when the air compressors of the second and third air separation and temperature recovery units are stopped, the compressed air after the molecular sieve of the first air separation and temperature recovery unit is responsible for recovering and purging three sets of air separation, the compressed air enters the rectifying tower A4 for recovering heat through the valve 1 and the valve 2 after passing through the molecular sieve A2, then enters the rectifying tower B4 for recovering heat through the valve 1, the valve 11, the valve 12 and the valve 5, and enters the rectifying tower C4 for recovering heat through the valve 1, the valve 11, the valve 13 and the valve 8, and the valves 4 and 7 are closed to prevent the gas channeling from increasing the energy consumption; the maintenance time of the second set and the third set of air separation units is increased by about 72 hours, and a large amount of steam for the operation of the air compressor is saved.
According to the energy-saving rewarming system for the air separation device, provided by the utility model, a plurality of sets of air compressors can be stopped in advance when the system is stopped for rewarming after the pipelines are communicated with each other, compressed air of other units is used for being connected into the system in series for rewarming the rectifying tower, and the steam consumption is saved within 48-72 hours after the system is stopped for rewarming; the unit can be disassembled and inspected 48 hours in advance during maintenance; therefore, steam consumption is saved and the overhaul time of the unit is prolonged.
The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which is also intended to be covered by the present utility model.
Claims (2)
1. The energy-saving re-heating system of the air separation device is characterized by comprising at least two sets of air separation re-heating units and a communication pipeline for communicating the sets of air separation re-heating units;
each set of air separation rewarming unit comprises an air compressor (A1), a molecular sieve (A2), a plate heat exchanger (A3) and a rectifying tower (A4); the compressed air output port of the air compressor (A1) is communicated with the air inlet of the molecular sieve (A2); the exhaust port of the molecular sieve (A2) is communicated with the heat medium inlet of the plate heat exchanger (A3); the heat medium outlet of the plate heat exchanger (A3) is communicated with the bottom air inlet of the rectifying tower (A4); the top exhaust port of the rectifying tower (A4) is communicated with the cold medium inlet of the plate heat exchanger (A3), and the cold medium outlet of the plate heat exchanger (A3) is communicated with the atmosphere;
the exhaust port of the molecular sieve (A2) of any set of the space division rewarming unit is communicated with the exhaust ports of the molecular sieves (A2) of other sets of the space division rewarming units through the communicating pipe.
2. The energy-saving and temperature-restoring system of the air separation device according to claim 1, wherein a1 st valve is arranged at an exhaust port of the molecular sieve (A2); a2 nd valve is arranged at a heat medium outlet of the plate heat exchanger (A3); a3 rd valve is arranged at a cold medium outlet of the plate heat exchanger (A3); and the communication pipeline is provided with a control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321550760.0U CN220541529U (en) | 2023-06-16 | 2023-06-16 | Energy-saving rewarming system of air separation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321550760.0U CN220541529U (en) | 2023-06-16 | 2023-06-16 | Energy-saving rewarming system of air separation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220541529U true CN220541529U (en) | 2024-02-27 |
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ID=89963973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321550760.0U Active CN220541529U (en) | 2023-06-16 | 2023-06-16 | Energy-saving rewarming system of air separation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220541529U (en) |
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2023
- 2023-06-16 CN CN202321550760.0U patent/CN220541529U/en active Active
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