CN220687616U - Recovery system for fully utilizing redundant emptying energy of air compressor - Google Patents
Recovery system for fully utilizing redundant emptying energy of air compressor Download PDFInfo
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- CN220687616U CN220687616U CN202322392222.XU CN202322392222U CN220687616U CN 220687616 U CN220687616 U CN 220687616U CN 202322392222 U CN202322392222 U CN 202322392222U CN 220687616 U CN220687616 U CN 220687616U
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- 238000011084 recovery Methods 0.000 title claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims abstract description 15
- 238000007906 compression Methods 0.000 claims abstract description 15
- 238000010248 power generation Methods 0.000 claims abstract description 8
- 230000003584 silencer Effects 0.000 claims description 10
- 230000030279 gene silencing Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 26
- 238000001816 cooling Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 238000004519 manufacturing process 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass 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
- 239000003208 petroleum Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of air separation devices, and discloses a recovery system for fully utilizing redundant emptying energy of an air compressor, which mainly comprises an air compression system, an emptying pipeline system, a redundant emptying expansion system of the air compressor and a power generation system connected with the expansion system; a first-stage interstage cooler is arranged on a pipeline between the first-stage air compressor and the second-stage air compressor, and a second-stage interstage cooler is arranged on a pipeline between the second-stage air compressor and the third-stage air compressor; the emptying pipeline system mainly comprises three flow path pipelines including a flow path I, a flow path II and a flow path III, and all the three flow path pipelines are mutually communicated with the three-stage air compressor. The recovery system and the recovery method for fully utilizing the redundant energy of the air compressor can efficiently and conveniently recover the redundant energy of the air compressor, and the generated electric energy can be connected with the power utilization of a factory, so that the energy consumption and the carbon emission index of the whole factory are saved.
Description
Technical Field
The utility model relates to the technical field of air separation devices, in particular to a recovery system for fully utilizing redundant emptying energy of an air compressor.
Background
Industrial gas is used as an important basic raw material in modern industry, has a very wide application range, and uses a large amount of oxygen, nitrogen and argon in the departments of metallurgy, steel, petroleum, chemical industry, machinery, electronics, glass, ceramics, building materials, buildings, food processing, medical treatment and the like. Because of the large coverage of the application of gas products, the production and supply of gas as an infrastructure of an industrial investment environment is regarded as a national economy "pulse" and listed as the utility industry.
The energy consumption of the air compression ring is dominant in the whole industrial gas industry, and is up to more than 90%. Thus, once the oxygen demand of the downstream equipment is reduced, the air separation unit needs to be operated at low load, and the compressor characteristics determine that the excess air must be vented to meet the low load operation requirements of the air separation unit. The pressure of the exhaust air is generally 4.6-4.8 barG, the temperature is about 100-108 ℃, and a large amount of static pressure energy and heat energy are contained.
At present, all domestic and international air separation devices generally adopt a method for directly emptying a compressor during low-load operation, and a device for recovering surplus air quantity energy during low-load operation is not provided. Below 75% -80% load operation, the compressor needs to be vented to maintain operation. If the actual running load of a certain factory is 55%, about 20% of compressed air is directly discharged to the atmosphere through an air-defense valve to consume a large amount of electric energy in order to maintain the normal running of the air compressor. Under the condition, the main production cost of the air separation device is the consumption of electric energy or high-pressure steam, so that the device is suitable for national policies of energy conservation, emission reduction and energy storage in order to reduce the production cost, and the operation cost of the device is sufficiently reduced.
Disclosure of Invention
The utility model aims to provide a recovery system for fully utilizing the redundant emptying energy of an air compressor so as to solve the problems in the background technology.
In order to solve the technical problems, the utility model provides the following technical scheme: the recovery system for fully utilizing the redundant air discharge energy of the air compressor mainly comprises an air compression system, an air discharge pipeline system, a redundant air discharge expansion system of the air compressor and a power generation system connected with the expansion system;
the air compression system comprises a first-stage air compressor, a second-stage air compressor and a third-stage air compressor, wherein the first-stage air compressor, the second-stage air compressor and the third-stage air compressor are sequentially connected through pipelines, a first-stage inter-stage cooler is arranged on a pipeline between the first-stage air compressor and the second-stage air compressor, and a second-stage inter-stage cooler is arranged on a pipeline between the second-stage air compressor and the third-stage air compressor;
the emptying pipeline system mainly comprises three flow path pipelines including a flow path I, a flow path II and a flow path III, and the three flow path pipelines are communicated with the three-stage air compressor;
the redundant air discharge expansion system of the air compressor mainly comprises an air expander.
Preferably, the first flow path is communicated with an air separation device precooling system, the second flow path is communicated with an air compressor air vent valve and an air vent silencer, the third flow path is communicated with an expander inlet valve and an air expander, the air expander is communicated with an air vent silencer, and a generator contained in the power generation system is connected with the air expander in an electrified mode.
A recovery method of a recovery system fully utilizing redundant emptying energy of an air compressor is characterized by comprising the following steps of: mainly comprises the following specific steps:
s1, raw material air for producing an original air separation device is subjected to mechanical impurity removal through an air filter and then enters a first-stage air compressor for compression, and compressed gas enters a first-stage inter-stage cooler for cooling;
s2, enabling the gas cooled by the primary inter-stage cooler to enter a secondary air compressor for compression, and enabling the compressed gas to enter the secondary inter-stage cooler for cooling;
s3, the gas cooled by the secondary inter-stage cooler enters the tertiary air compressor for compression and then waits for distribution treatment.
Preferably, the temperature of the gas compressed by the three-stage air compressor is about 100-108 ℃ and the pressure is about 4.6-4.8 barG.
Preferably, when the load of the air separation device is more than 80% in the gas processed in the third step, all the gas at the outlet of the three-stage air compressor enters a precooling system of a subsequent air separation device of the air separation device through a first flow path for cooling.
Preferably, because the design of the air expander has the requirement of the minimum load, when the air quantity at the inlet of the air expander is lower than the minimum load of the air expander, compressed air can be discharged through the air compressor discharge valve through the second flow path, and then is subjected to silencing and discharging through the first discharge silencer.
Preferably, when the load of the whole air separation device is less than 75%, the exhaust gas of the three-stage air compressor with the load less than 75% enters the air expander through the inlet valve of the expander through the flow path three-way to be expanded to a certain temperature and then is discharged into the atmosphere, and then is subjected to silencing and discharging through the second emptying silencer.
Preferably, once the amount of air discharged is higher than the amount of air required by the lowest load operation of the expander, the air discharge valve of the air compressor is slowly closed, and then all the air flows enter the air expander through a third flow path to be expanded, and the air is discharged into the atmosphere after the pressure of the air compressor is reduced.
Compared with the prior art, the utility model has the following beneficial effects:
firstly, the utility model can efficiently and conveniently recycle the redundant emptying energy of the air compressor, and the generated electric energy can be connected with the power of the factory, so that the energy consumption and the carbon emission index of the whole factory are saved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model provides the following technical scheme:
example 1
Referring to fig. 1, a recovery system and a recovery method for fully utilizing redundant air energy of an air compressor mainly comprise an air compression system, an air vent pipeline system, a redundant air expansion system of the air compressor and a power generation system connected with the expansion system, wherein the air compression system comprises a primary air compressor, a secondary air compressor and a tertiary air compressor, the primary air compressor, the secondary air compressor and the tertiary air compressor are sequentially connected through pipelines, a primary inter-stage cooler is arranged on a pipeline between the primary air compressor and the secondary air compressor, a secondary inter-stage cooler is arranged on a pipeline between the secondary air compressor and the tertiary air compressor, the three pipeline systems mainly comprise a primary pipeline, a secondary pipeline and a tertiary pipeline, three pipeline pipelines are respectively communicated with the tertiary air compressor, the redundant air expansion system of the air compressor mainly comprises an air expander, the primary pipeline is communicated with an air separation device system, an air compressor air vent valve and an air compressor silencer are arranged on the secondary pipeline, an expander inlet valve and an air expander are arranged on the primary pipeline, the secondary pipeline is communicated with the air compressor, and the air expander is communicated with the secondary pipeline, and the air compressor is connected with the power generator.
According to the technical scheme, the redundant air quantity of the air compressor is recycled and utilized instead of being directly dissipated into the atmosphere through the air release valve, the kinetic energy and the heat energy of the redundant air quantity of the air compressor are fully utilized, the energy is converted into the electric energy, the energy is recycled, the emission is reduced, the redundant air quantity of the air compression system can be fully utilized for energy recycling during low-load operation of the air separation plant, the kinetic energy and the heat energy of the dissipated useless air are converted into the electric energy, the load of the air compressor can be zero-released during 75% -80% of operation of the general air separation plant, but the operating point of the air compressor is close to a surge line after the load is lower than 75% -80%, the air release valve can be opened, so that the redundant air quantity of the air compressor can be dissipated into the silencer through the air release valve system to be finally dissipated into the atmosphere, and the kinetic energy and the heat energy in the air released by the air compressor are fully utilized for power generation through the expander and the power generation system.
Example two
Referring to fig. 1, and based on the first embodiment, further obtain: a recovery method of a recovery system fully utilizing redundant emptying energy of an air compressor is characterized by comprising the following steps of: mainly comprises the following specific steps:
s1, raw material air for producing an original air separation device is subjected to mechanical impurity removal through an air filter and then enters a first-stage air compressor for compression, and compressed gas enters a first-stage inter-stage cooler for cooling;
s2, enabling the gas cooled by the primary inter-stage cooler to enter a secondary air compressor for compression, and enabling the compressed gas to enter the secondary inter-stage cooler for cooling;
s3, the gas cooled by the secondary inter-stage cooler enters the tertiary air compressor for compression and then waits for distribution treatment.
The temperature of the gas compressed by the three-stage air compressor is about 100-108 ℃ and the pressure is about 4.6-4.8 barG, when the load of the air separator is more than 80% in the gas processed by the third step, all the gas at the outlet of the three-stage air compressor enters the precooling system of the subsequent air separator through a first flow path, and is cooled by a precooling system of the subsequent air separator, and as the design of the air expander has the minimum load requirement, when the gas quantity at the inlet of the air expander is lower than the minimum load of the air expander, compressed air can be discharged through an air compressor discharge valve through a second flow path, and then is subjected to silencing discharge through a first air silencer, when the load of the whole air separator is less than 75%, the gas of the three-stage air compressor enters the air expander through an inlet valve of the three-way air expander to be expanded to a certain temperature and then is discharged into the atmosphere, and then, once the gas quantity discharged is higher than the minimum load of the air expander, the air compressor is slowly closed, and then all the gas quantity enters the three flow paths to be discharged into the air expander, and the pressure is simultaneously lowered.
According to the technical scheme, the characteristics of the centrifugal compressor determine that the machine is designed with the minimum load, when the air inflow is reduced and reaches the minimum value allowed by the compressor, the centrifugal compressor can surge, the surge phenomenon is very harmful to the compressor, therefore, when the load of the centrifugal compressor is smaller than the designed minimum load, the normal operation of the machine can be maintained by a method of emptying a part of air volume, the exhaust gas of the three-stage air compressor is converted into high-speed fluid to drive the impeller of the expander to do work at a high speed after passing through the nozzle of the air expander, the part of mechanical work drives the generator coaxial with the expander to rotate, and induced electromotive force is output, namely, the energy of the exhaust gas of the three-stage air compressor is converted into electric energy, and when a large-scale industrial gas device such as a 6-ten-thousand air separator, an 8-thousand-air separator and a 10-thousand-scale air separator is operated, the part of the exhaust volume of the raw material air compressor can be inflated and then emptied after the 55% of the air separator is inflated. By adopting the process, the redundant emptying energy of the air compressor can be efficiently and conveniently recovered, the generated electric energy can be connected with the power utilization of the factory, and the energy consumption and carbon emission index of the whole factory are saved.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit thereof, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A recovery system for fully utilizing redundant emptying energy of an air compressor is characterized in that: the system mainly comprises an air compression system, an air vent pipeline system, an air compressor redundant air vent expansion system and a power generation system connected with the expansion system;
the air compression system comprises a first-stage air compressor, a second-stage air compressor and a third-stage air compressor, wherein the first-stage air compressor, the second-stage air compressor and the third-stage air compressor are sequentially connected through pipelines, a first-stage inter-stage cooler is arranged on a pipeline between the first-stage air compressor and the second-stage air compressor, and a second-stage inter-stage cooler is arranged on a pipeline between the second-stage air compressor and the third-stage air compressor;
the emptying pipeline system mainly comprises three flow path pipelines including a flow path I, a flow path II and a flow path III, and the three flow path pipelines are communicated with the three-stage air compressor;
the redundant air discharge expansion system of the air compressor mainly comprises an air expander.
2. The recovery system for fully utilizing the redundant emptying energy of the air compressor according to claim 1, wherein: the air separator precooling system is arranged on the first flow path in a communicating mode, the air compressor emptying valve and the air compressor emptying silencer I are arranged on the second flow path in a communicating mode, the expander inlet valve and the air expander are arranged on the third flow path in a communicating mode, the air expander is provided with the air compressor emptying silencer II in a communicating mode, and the generator contained in the power generation system is connected with the air expander in an electrified mode.
3. The recovery system for fully utilizing the redundant emptying energy of the air compressor according to claim 1, wherein: the temperature of the gas compressed by the three-stage air compressor is 100-108 ℃, and the pressure is 4.6-4.8 barG.
4. The recovery system for fully utilizing the redundant emptying energy of the air compressor according to claim 1, wherein: when the load of the air separation device is more than 80%, all the gas at the outlet of the three-stage air compressor enters a precooling system of the subsequent air separation device of the air separation device through a first flow path.
5. The recovery system for fully utilizing the redundant emptying energy of the air compressor according to claim 1, wherein: when the load of the whole air separation device is less than 75%, the exhaust gas of the three-stage air compressor with the load less than 75% enters the air expander through the inlet valve of the expander through the three-way flow path to be expanded to a certain temperature and then is discharged into the atmosphere, and then is subjected to silencing and discharging through the second emptying silencer.
6. The recovery system for fully utilizing the redundant emptying energy of the air compressor according to claim 1, wherein: once the air volume of the air compressor is higher than the air volume required by the lowest load operation of the expander, the air valve of the air compressor is slowly closed, and then all the air volume enters the air expander through a third flow path to expand, and the air is discharged into the atmosphere after the pressure of the air compressor is reduced.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322392222.XU CN220687616U (en) | 2023-09-04 | 2023-09-04 | Recovery system for fully utilizing redundant emptying energy of air compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322392222.XU CN220687616U (en) | 2023-09-04 | 2023-09-04 | Recovery system for fully utilizing redundant emptying energy of air compressor |
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| CN220687616U true CN220687616U (en) | 2024-03-29 |
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| CN202322392222.XU Active CN220687616U (en) | 2023-09-04 | 2023-09-04 | Recovery system for fully utilizing redundant emptying energy of air compressor |
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- 2023-09-04 CN CN202322392222.XU patent/CN220687616U/en active Active
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