CN106338182A - Energy-saving control method for air separating system - Google Patents
Energy-saving control method for air separating system Download PDFInfo
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- CN106338182A CN106338182A CN201610723171.6A CN201610723171A CN106338182A CN 106338182 A CN106338182 A CN 106338182A CN 201610723171 A CN201610723171 A CN 201610723171A CN 106338182 A CN106338182 A CN 106338182A
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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
- F25J3/04375—Details relating to the work expansion, e.g. process parameter etc.
- F25J3/04393—Details relating to the work expansion, e.g. process parameter etc. using multiple or multistage gas work expansion
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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
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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
- F25J3/04163—Hot end purification of the feed air
- F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
- F25J3/04175—Hot end purification of the feed air by adsorption of the impurities at a pressure of substantially more than the highest 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
- F25J3/04248—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
- F25J3/04296—Claude expansion, i.e. expanded into the main or 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
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04333—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/04339—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of air
- F25J3/04345—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of air and comprising a gas work expansion loop
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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
- F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
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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
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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
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/40—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being air
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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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- 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
- F25J2280/00—Control of the process or apparatus
- F25J2280/02—Control in general, load changes, different modes ("runs"), measurements
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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 invention discloses an energy-saving control method for an air separating system, and belongs to the technical field of gas liquefaction separation. The energy-saving control method comprises the following steps of: 1) enabling opening degree of an inlet valve of a circulating compressor to be 65-75%; 2) slowly reducing opening degree of a bypass-valve of the circulating compressor to 0 from 100% through multi-time regulation; 3) enabling rotation speed of a hot-end expansion machine to be 30000-32000r/min; and 4) enabling rotation speed of a cold-end expansion machine to be 35000-37000r/min; 5) regulating opening degree of a liquid inlet valve of a lower tower of a rectifying tower, and ensuring pressure of the lower tower to be 450 Kpa. According to the energy-saving control method disclosed by the invention, energy consumption of doing useless work is reduced by closing the bypass-valve of the compressor, so that energy consumption of the circulating compressor is greatly reduced; and meanwhile, operation parameters of each performing part are precisely controlled, so that surges of the system are avoided, stability during system regulation is improved, and system operation is safe and reliable.
Description
Technical field
The invention belongs to gas liquefaction separation technology field is and in particular to a kind of Energy Saving Control side of air-seperation system
Method.
Background technology
Existing air-seperation system all operates in the range of design parameter substantially, there is larger energy consumption.As certain
4000nm3/ h unit, the relevant operational parameter that supplier provides is: recycle compressor, entry guide vane (inlet valve) standard-sized sheet, import
Flow about 37000nm3/ h, by-passing valve leaves 10%-25%, outlet pressure 2.9mpa；Hot junction decompressor, entry nozzle (import
Valve) 55%, inlet flow rate about 14500nm3/ h, outlet pressure 0.575mpa, rotating speed 29000r/min；Hot junction supercharger, import
Valve standard-sized sheet, inlet flow rate 32100nm3/ h, outlet pressure 4.3mpa；Cold end decompressor, entry nozzle (inlet valve) 65%, import
Flow about 13000nm3/ h, outlet pressure 0.58mpa, rotating speed 34000r/min；Cold end supercharger, inlet valve standard-sized sheet, inlet flow
Amount 32100nm3/ h, outlet pressure 5.5mpa.
Operational procedure operation according to supplier can reach design production capacity, but this system has larger design and has more than needed, its
Potentiality are not excavated, and there is larger system energy consumption, and meanwhile, by-passing valve leaves 10%-25% and is equivalent to emptying 10%-
25%, energy there is also larger consuming, therefore, if only can be joined by control on the basis of existing air-seperation system
The change of number can achieve energy-saving have great importance.
Content of the invention
In view of this, it is an object of the invention to provide a kind of control that existing air-seperation system energy consumption can be greatly reduced
Method, too high to solve the problems, such as prior art energy consumption.
For reaching above-mentioned purpose, the purpose of the present invention is achieved through the following technical solutions:
A kind of energy-saving control method of air-seperation system, after circulating air compressor compresses and cools down, part compression
Air enters main heat exchanger gas cooling of being backflowed and extracts to after uniform temperature, carries out swell refrigeration in the decompressor of feeding hot junction,
Air after expansion returns main heat exchanger, and mixes with the air after cold end decompressor demi-inflation re-heat wherein, continues multiple
To normal temperature, cooling box removes recycle compressor as circulation air to heat；The remaining air going out recycle compressor enters hot junction decompressor
Pressurized end supercharging, and after the cooling of intensified machine aftercooler, enter the pressurized end of cold end decompressor, supercharging is simultaneously through cold end supercharging
Machine aftercooler cools down, and subsequently into main heat exchanger, after being cooled to uniform temperature, it is swollen that most of air is drawn out of feeding cold end
Swollen machine swell refrigeration, the air after expansion, through vapor-liquid separation, enters tower on rectifying column, after separating after the liquid throttling after separating
Gas part is sent into tower under rectifying column and is participated in rectifying, and remaining enters main heat exchanger re-heat as circulation air cooling box；Through cold end
Remaining air after supercharger supercharging enters tower under rectifying column through throttling after continuing cooling liquid in main heat exchanger and participates in rectifying,
Also include following state modulator:
1) aperture of recycle compressor inlet valve is 65～75%；
2) aperture of recycle compressor by-passing valve is slowly decreased to 0 through multiple adjustment by 100%；
3) decompressor rotating speed in hot junction is 30000～32000r/min；
4) cold end decompressor rotating speed is 35000～37000r/min；
5) the bypass valve opening between cold end decompressor and hot junction decompressor is 0～5%；
6) adjust the feed liquor valve opening of tower under rectifying column it is ensured that lower pressure tower is 445～455kpa；
Step 1), 2), 3), 4), 5) and 6) corrdinated adjustment and simultaneously completing.
Further, the outlet pressure of recycle compressor is 2.6～2.7mpa.
Further, the aperture of recycle compressor by-passing valve adjusts amplitude every time is 5%.
The beneficial effects of the present invention is:
The present invention, by the closing to compressor bypass valve, decreases the power consumption flogging a dead horse, the energy consumption of recycle compressor
It is greatly reduced, in the case of so that the production capacity of air-seperation system is not reduced, and the energy consumption of system decreases it is achieved that saving
Can consumption reduction, meanwhile, by the precise control to each execution unit operational factor, it is to avoid the surge of system and unstable, improve
Stability during system call interception, makes the system operation safe and reliable.
Brief description
Fig. 1 is the structural representation of certain air-seperation system.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
As shown in figure 1, being the structural representation of certain air-seperation system, its air-separating technology is: circulation air compression
After machine compresses and cools down, a part of compressed air enters main heat exchanger gas cooling of being backflowed and extracts to after uniform temperature, feeding
Carry out swell refrigeration, the air after expansion returns main heat exchanger, and partly swollen with cold end decompressor wherein in the decompressor of hot junction
Air mixing after swollen re-heat, continues re-heat to normal temperature, cooling box removes recycle compressor as circulation air；Go out recycle compressor
Remaining air enter the pressurized end supercharging of hot junction decompressor, and enter cold end decompressor after the cooling of intensified machine aftercooler
Pressurized end, supercharging simultaneously cools down, subsequently into main heat exchanger, after being cooled to uniform temperature, greatly through cold end supercharger aftercooler
Partial air is drawn out of feeding cold end expander refrigeration, and the air after expansion is through vapor-liquid separation, the liquid throttling after separating
Enter tower on rectifying column afterwards, the gas part after separating is sent into tower under rectifying column and participated in rectifying, and remaining enters main heat exchanger re-heat
As circulation air cooling box；Remaining air after the supercharging of cold end supercharger continues after cooling liquid in main heat exchanger through section
Stream enters tower under rectifying column and participates in rectifying.
The operating parameter that the equipment supplier of this system provides is: air compressor machine, entry guide vane (inlet valve) standard-sized sheet, atmospheric valve
Fully closed, inlet flow rate about 21500nm3/ h, outlet pressure 0.5mpa；Recycle compressor, entry guide vane (inlet valve) standard-sized sheet, enters
Mouth flow about 37000nm3/ h, by-passing valve leaves 10%-25%, outlet pressure 2.9mpa；Hot junction decompressor, entry nozzle (enters
Mouth valve) 55%, inlet flow rate about 14500nm3/ h, outlet pressure 0.575mpa, rotating speed 29000r/min；Hot junction supercharger, enters
Mouth valve standard-sized sheet, inlet flow rate 32100nm3/ h, outlet pressure 4.3mpa；Cold end decompressor, entry nozzle (inlet valve) 65%, enters
Mouth flow about 13000nm3/ h, outlet pressure 0.58mpa, rotating speed 36000r/min；Cold end supercharger, inlet valve standard-sized sheet, import
Flow 32100nm3/ h, outlet pressure 5.5mpa.Operational procedure operation according to supplier can reach design production capacity, circulation compression
Dynamo-electric stream 249a, 10%-25% left by by-passing valve.
It can be seen that, said system design is more than needed, and by-passing valve there is also more waste, there are the potentiality of energy-conservation, and prior art carries
How go out to increase a piston compressor or buy the schemes such as a set of specialty control software, but be required for increasing extra investment
In the case of not increasing additional investment, reach energy-saving purpose, applicant's following energy-saving control method of proposition:
First, the adjustment of recycle compressor:
1) meeting under conditions of compressor do not kick and shake, the aperture of recycle compressor inlet valve is 60～70%, most preferably
65%；
2) progressively turn down recycle compressor by-passing valve (being equivalent to atmospheric valve) from 100% to 0, each pass is less than by a small margin
5%；
3) outlet pressure reducing recycle compressor is stepped up to 2.6～2.7mpa, most preferably 2.65mpa.
To coordinate inlet valve during startup, by-passing valve, the adjustment of outlet pressure, first operation inlet valve, again outlet pressure, last
By-passing valve.The cooling potential of decompressor to be fully taken into account when adjusting recycle compressor, corrdinated adjustment wanted by decompressor.Logical
Cross the closing progressively to compressor bypass valve, decrease the power consumption flogging a dead horse, the energy consumption of recycle compressor is greatly reduced.
2nd, the adjustment of decompressor:
Cold end decompressor rotating speed not can exceed that 37400r/min, and hot junction decompressor rotating speed not can exceed that 34000r/min, leads to
Cross out big nozzle to increase decompressor air inflow, hot junction decompressor rotating speed controls in 30000～32000r/min, most preferably
31000r/min, cold end decompressor rotating speed controls in 35000～37000r/min, most preferably 34000r/min.Turn down swollen
During swollen unit return valve, decompressor rotating speed may increase, and will turn down nozzle of expansion machine accordingly, and by cold end decompressor with heat
Bypass valve opening between the decompressor of end is set to 0～5% it is generally desirable to fully closed, fully squeezes the potentiality of decompressor.By improving
Rotating speed improves swell increment, and the refrigerating capacity lost because recycle compressor outlet pressure reduces is recovered.
3rd, the adjustment of rectifying column:
Adjust the aperture of the liquid feed valve lcv3 of tower under rectifying column it is ensured that the pressure of tower is 445～455kpa under rectifying column,
Excellent for 450kpa.
After the completion of adjustment, recycle compressor electric current is reduced to 232a by 249a, reduces by 10～20a, and production capacity does not have
Reduce, saved energy consumption.
Finally illustrate, preferred embodiment above only in order to technical scheme to be described and unrestricted, although logical
Cross above preferred embodiment the present invention to be described in detail, it is to be understood by those skilled in the art that can be
In form and various changes are made to it, without departing from claims of the present invention limited range in details.
Claims (3)
1. a kind of energy-saving control method of air-seperation system, after circulating air compressor compresses and cools down, part compression is empty
Gas enters main heat exchanger gas cooling of being backflowed and extracts to after uniform temperature, carries out swell refrigeration in the decompressor of feeding hot junction, swollen
Air after swollen returns main heat exchanger, and mixes with the air after cold end decompressor demi-inflation re-heat wherein, continues re-heat
To normal temperature, cooling box removes recycle compressor as circulation air；The remaining air going out recycle compressor enters hot junction decompressor
Pressurized end is pressurized, and enters the pressurized end of cold end decompressor after the cooling of intensified machine aftercooler, is pressurized and through cold end supercharger
Aftercooler cools down, and subsequently into main heat exchanger, after being cooled to uniform temperature, most of air is drawn out of feeding cold end and expands
Machine swell refrigeration, the air after expansion, through vapor-liquid separation, enters tower on rectifying column after the liquid throttling after separating, the gas after separating
Body is distributed into tower under rectifying column and participates in rectifying, and remaining enters main heat exchanger re-heat as circulation air cooling box；Increase through cold end
Remaining air after press supercharging enters tower under rectifying column through throttling after continuing cooling liquid in main heat exchanger and participates in rectifying, its
It is characterised by: also include following state modulator:
1) aperture of recycle compressor inlet valve is 65～75%；
2) aperture of recycle compressor by-passing valve is slowly decreased to 0 through multiple adjustment by 100%；
3) decompressor rotating speed in hot junction is 30000～32000r/min；
4) cold end decompressor rotating speed is 35000～37000r/min；
5) the bypass valve opening between cold end decompressor and hot junction decompressor is 0～5%；
6) adjust the feed liquor valve opening of tower under rectifying column it is ensured that lower pressure tower is 445～455kpa；
Step 1), 2), 3), 4), 5) and 6) corrdinated adjustment and simultaneously completing.
2. a kind of air-seperation system according to claim 1 energy-saving control method it is characterised in that: recycle compressor
Outlet pressure be 2.6～2.7mpa.
3. a kind of air-seperation system according to claim 1 energy-saving control method it is characterised in that: recycle compressor
It is 5% that the aperture of by-passing valve adjusts amplitude every time.
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|---|---|---|---|
| CN201610723171.6A CN106338182B (en) | 2016-08-25 | 2016-08-25 | A kind of energy-saving control method of air-seperation system |
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| CN201610723171.6A CN106338182B (en) | 2016-08-25 | 2016-08-25 | A kind of energy-saving control method of air-seperation system |
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| CN106338182A true CN106338182A (en) | 2017-01-18 |
| CN106338182B CN106338182B (en) | 2018-11-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108240734A (en) * | 2018-03-08 | 2018-07-03 | 李佳晨 | Booster expansion machine air supply system and air separation plant |
| CN109883140A (en) * | 2019-03-29 | 2019-06-14 | 湖北浠水蓝天联合气体有限公司 | A kind of nitrogen gas liquefaction system after space division system rectifying |
| CN109973412A (en) * | 2017-12-27 | 2019-07-05 | 沈阳自动化研究所(昆山)智能装备研究院 | One kind being used for external compression air separation unit oxygen compressor anti-asthma method of slight |
| CN112556313A (en) * | 2020-12-28 | 2021-03-26 | 镇江市恒利低温技术有限公司 | Heat supply and air separation system utilizing high-temperature and high-pressure steam and application method thereof |
| CN112556312A (en) * | 2020-12-12 | 2021-03-26 | 镇江市恒利低温技术有限公司 | Steam-driven air separation method and steam T-stage utilization system for same |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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