CN205300115U - Separately cooling formula single -stage rectification air separation device - Google Patents
Separately cooling formula single -stage rectification air separation device Download PDFInfo
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- CN205300115U CN205300115U CN201521049831.4U CN201521049831U CN205300115U CN 205300115 U CN205300115 U CN 205300115U CN 201521049831 U CN201521049831 U CN 201521049831U CN 205300115 U CN205300115 U CN 205300115U
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Abstract
The utility model provides a separately cooling formula single -stage rectification air separation device, including king -tower, secondary tower, main condensing evaporator, tower cauldron, argon condensing evaporator, heat exchanger, recycle compressor, liquid oxygen pump, choke valve and pipeline. The bottom of secondary tower and the middle part of king -tower hypomere intercommunication, the heat exchanger includes oxygen heat exchanger, nitrogen gas heat exchanger, thick argon heat exchanger, circulation heat exchanger. Regard as the distillate also to regard as condensing evaporator's refrigerant, the inside refrigeration cycle of implementation system simultaneously the liquid oxygen. And regard as the refrigerant to pass through choke valve and liquid oxygen pump and pipeline the liquid oxygen of king -tower bottom and directly carry to the condensing evaporator of king -tower and secondary tower top of the tower in, greatly saved process flow and improved empty minute efficiency, this scheme has realized the single -stage area and has pressed rectification to separate the air, has produced pair high products. Not only process flow simplifies greatly, makes the separation energy consumption reduce more than 30% moreover.
Description
Technical field
This utility model belongs to space division field, is specifically related to external-cooling type single-stage rectification air separation unit.
Background technology
Air separation unit is to prepare oxygen and the segregation apparatus of the noble gas such as nitrogen and argon with air for raw material. By air is compressed, swell refrigeration, and then make air liquefaction, utilize rectifying column to isolate the products such as oxygen, nitrogen and noble gas (such as argon). The raw air used in production, it is possible to obtain whenever and wherever possible. Current Air separation industry is belonging to branch's industry of chemical industry.
Existing air separation plant technological process solidifies, and energy consumption is big, and air separation costs is higher, is especially not completely separated air in single-stage rectification, produces highly purified nitrogen and oxygen.
Utility model content
The purpose of this utility model is in that to provide a kind of external-cooling type single-stage rectification air separation unit, it is possible to realizes single-stage rectification with pressure and is kept completely separate air, produces highly purified N2And O2, and reduce separating energy consumption.
To achieve these goals, concrete scheme of the present utility model is as follows:
External-cooling type single-stage rectification air separation unit, including king-tower, secondary tower, condenser/evaporator, heat exchanger, recycle compressor, liquid oxygen pump, choke valve and conveyance conduit;
Described condenser/evaporator includes main condenser vaporizer, argon condenser/evaporator, and wherein said main condenser vaporizer and argon condenser/evaporator are separately positioned on the top of described king-tower and secondary tower; The bottom of described secondary tower connects with the middle part of king-tower hypomere;
Described heat exchanger includes oxygen heat exchanger, nitrogen heat exchanger, crude argon heat exchanger, circulation heat exchanger;
The middle part of described king-tower is provided with raw air charging aperture, raw air enters described king-tower by conveyance conduit from the charging aperture in the middle part of described king-tower after being cooled to saturation temperature in advance respectively through described oxygen heat exchanger, nitrogen heat exchanger and crude argon heat exchanger, liquid oxygen input port it is provided with bottom described king-tower, liquid oxygen is injected from this liquid oxygen input port to described tower reactor, raw air uphill process enters with overhead reflux liquid nitrogen caloic exchange, isolates nitrogen. Nitrogen is from the Base top contact of king-tower and by reclaiming after nitrogen heat exchanger re-heat to room temperature, and liquid is back to bottom king-tower and isolates liquid oxygen. Liquid oxygen enters the main condenser vaporizer at king-tower top and the argon condenser/evaporator at secondary tower top through choke valve, liquid oxygen pump, conveyance conduit, as the coolant of these two condenser/evaporators;
In king-tower, part nitrogen enters main condenser vaporizer and carries out heat exchange with liquid oxygen is cold, liquid oxygen boil-off gas enters described circulation heat exchanger, and rise by entering tower reactor after the pressurization cooling of described recycle compressor, condensation liquid nitrogen, as the oxygen caloic again exchange risen bottom backflow and the king-tower of king-tower, circulates with this;
The fraction containing Ar8-12% extracted from king-tower hypomere enters secondary tower, and in secondary tower, argon rectification separates and rises to secondary tower tower top. A part of argon is by reclaiming after described argon heat exchanger re-heat to room temperature. Major part continues condensing reflux to king-tower. In argon condenser/evaporator, the oxygen of evaporation reclaims again through after described oxygen heat exchanger re-heat to room temperature.
Further, described king-tower top is provided with liquid nitrogen input port.
Further, described argon condenser/evaporator is provided with liquid argon input port.
Liquid nitrogen input port and liquid argon input port and aforementioned liquid oxygen input port are all as the supplementary entrance of external source liquid nitrogen, liquid argon and liquid oxygen. Liquid oxygen, liquid nitrogen, liquid argon can be used alone, and use supplementary device cold damage be can be combined.
Further, the loop that described tower reactor connects with described main condenser vaporizer is provided with choke valve, and the loop connected with argon condenser/evaporator is provided with reflux inlet and described liquid oxygen pump.
Because main condenser outside pressure is less than argon outside condenser pressure, so, when the liquid oxygen bottom king-tower is sent in main condenser vaporizer by outside transfer pipeline, require over the flow of the choke valve restriction liquid oxygen coolant arranged on transfer pipeline, and when the liquid oxygen bottom king-tower being sent in the argon condenser/evaporator at secondary tower top, it is necessary to by liquid oxygen pump by its supercharging. Simultaneously, it is necessary to use reflux inlet limited flow, it is ensured that steadily carry.
Further, described oxygen heat exchanger, nitrogen heat exchanger and argon heat exchanger are plate type heat exchanger.
Plate type heat exchanger is that heat transfer medium does not contact, and carries out heat exchange only by heat exchanger itself, it is possible to reach the purpose of this programme.
By external-cooling type single-stage rectification air separation unit provided by the invention, breach single-stage rectification and be not completely separated air, produce high purity N2And O2Traditional theory. Liquid oxygen bottom king-tower is sent directly in the condenser/evaporator at king-tower top and secondary tower top as coolant by choke valve by this programme, and liquefy N2Backflow, it is achieved that single column (0.5-1MPa) with pressure seperating air by rectification, produces double; two high product. Not only technological process is greatly simplified, and makes separating energy consumption reduce by more than 30%. Meanwhile, directly using liquid oxygen in this programme, liquid nitrogen, liquid argon mends cold, more traditional air swell refrigeration, and it is low to mend cold temperature, and cold is big, it is possible to increase reflux ratio, improves rectification efficiency.
This utility model also has a characteristic that
1. in this programme, abandon the design concept of conventional air liquefaction segregation apparatus, refrigeration and two techniques of rectification are separated, the cold damage in runoff process is compensated by external source, break away from interfering and restricting between refrigeration and rectification, change dual factors problem is single factor test problem, reduces the difficulty of space division flow scheme design.
2. give full play to the feature that external-cooling type space division flow process can change flexibly, according to the feature of user with use gas requirement, carry out specific aim flow scheme design. Not only how much determine plant capacity according to gas consumption, and the purity of product oxygen and nitrogen, proportioning, go out pressure tower, rectification parameters all can optimized choice, meet user's requirement to greatest extent, reach best synthesis energy saving effect.
3. the theoretical analysis, Workflow restructuring and industrial experiment prove, air separation unit provided by the invention can reduce oxygen, and nitrogen separating energy consumption reaches more than 30%. First intake product 0.4KWh/M with the specific energy consumption that oxygen output is benchmark by the current world3O2It is down to 0.3KWh/M3O2Below.
Accompanying drawing explanation
The external-cooling type single-stage rectification single-stage rectification space division system figure that Fig. 1 provides for this utility model;
1. king-tower, 2. secondary tower (argon column), 3. main condenser vaporizer, 4. tower reactor, 5. argon condenser/evaporator, 6. oxygen heat exchanger, 7. nitrogen heat exchanger, 8. crude argon heat exchanger, 9. circulation heat exchanger, 10. recycle compressor, 11. liquid oxygen pumps, 12. choke valves, 13. reflux inlet, 14. king-tower epimere, 15. king-tower hypomeres
Detailed description of the invention
With reference to accompanying drawing, the embodiment of external-cooling type single-stage rectification air separation unit of the present utility model is illustrated.
Fig. 1 is the external-cooling type single-stage rectification space division flow chart of present embodiment.
As it is shown in figure 1, the external-cooling type single-stage rectification air separation unit that present embodiment provides includes king-tower 1 and secondary tower 2, king-tower 1 includes king-tower epimere 14 and king-tower hypomere 15, connects with the medium position of king-tower hypomere 15 bottom secondary tower 2.
After the compressed purification of raw air respectively through oxygen heat exchanger 6, nitrogen heat exchanger 7 and argon heat exchanger 8 respectively with the oxygen backflowed, nitrogen, argon carries out heat exchange, is cooled to saturation temperature and enters in the middle part of the king-tower 1 of rectifying column, it is particularly located at the upper end of king-tower hypomere 15, reinforced in king-tower 1.
Now, because the boiling point of nitrogen is lower than the boiling point of oxygen and argon, so in liquid, nitrogen evaporation rises in tower, in gas, oxygen, argon condensation decline realize rectification and separate. Rise to its purity of nitrogen at king-tower 1 top up to 5N. Part nitrogen a portion is drawn as product, and the liquid oxygen coolant that wherein another part enters main refrigerant evaporator interior with it carries out heat exchange, and post liquefaction becomes liquid nitrogen reflux. The liquid nitrogen of liquefaction backflow is crossing in process with the oxygen constantly risen bottom king-tower 1, owing to boiling point is relatively low, can again be vaporizated into nitrogen and rise to king-tower 1 top, and a part is drawn, and is partly into main condenser vaporizer 3 and carries out heat exchange, circulates with this and carry out.
Because inside king-tower 1, it is back to the liquid oxygen at the bottom of tower and cannot automatically rise to tower top, also gas evaporation cannot be converted into out, so in present embodiment, outside bottom king-tower 1 has arranged the conveyance conduit being provided with choke valve 12, this conveyance conduit connects with the condenser/evaporator of tower top at the bottom of king-tower 1 tower, participates in heat exchange at this point it is possible to be conveyed into after being reduced pressure by choke valve by the part liquid oxygen at the bottom of tower in the main condenser vaporizer 3 of tower top as the coolant in main condenser vaporizer 3.
And now the liquid oxygen coolant in main condenser vaporizer 3 is because being gasificated as gas evaporation after carrying out heat exchange with the nitrogen risen, the gas of evaporation is after circulation heat exchanger 9 re-heat of peripheral hardware, and pressurize through recycle compressor 10, enter tower reactor 4 rising circulation after cooling and participate in rectification, and then realize the kind of refrigeration cycle of internal system and recycling of coolant.
Also including a secondary tower 2 in the side of described king-tower 1, this secondary tower 2 connects with the middle part of king-tower 1 hypomere 15 simultaneously. In distillation process, the boiling point of nitrogen is minimum, argon is close with the boiling point of oxygen, in king-tower 1, oxygen and argon all cannot rise to the top of king-tower 1, so, only nitrogen can be separated at king-tower 1 top, and 8-12% Argon fraction is collected at the medium position of king-tower 1 hypomere 15, is admitted to secondary tower 2 and carries out oxygen, argon separation.
Now, initial backflow required in secondary tower 2 can pass through extracting part separatory oxygen coolant from the tower reactor 4 bottom king-tower 1 and through liquid oxygen pump 11 and be admitted in the argon refrigerant evaporator at secondary tower 2 top by reflux inlet 13, carries out heat exchange with the argon risen.
In secondary tower 2, because the boiling point of oxygen is higher than the boiling point of argon, so, argon is easier to be converted into gas evaporation and rises. Argon rises to secondary tower 2 top, and a part is drawn as product, and is recovered to room temperature through outside argon heat exchanger 8 re-heat. It is liquid argon condensing reflux that major part argon can enter in the argon condenser/evaporator 5 at secondary tower 2 top that the liquid oxygen coolant interior with it carries out Gas heated reforming, liquid oxygen coolant in argon condenser/evaporator 5 can be converted into oxygen discharge simultaneously, and as Product recycling after oxygen heat exchanger 6 re-heat reaches room temperature.
So, by external-cooling type single-stage rectification single-stage rectification air separation unit provided by the invention, it is possible to realize single-stage rectification and can be kept completely separate air, produce 2N pure oxygen and 5N purity nitrogen.
For compensating the cold damage of distillation process, LO can be used alone or in combination2��LN2, LAr supplements from respective inlet respectively, it is ensured that distillation process continuously performs. The feature of external-cooling type single-stage low-pressure distillation air separation unit:
1) outer cooling and air separating device starts rapidly, and start-stop is convenient. Not by mend speed of cooling limited, startup stage strengthen mend cold, quickly equipment is cooled to duty. Within thermal starting can be controlled in 8 hours. Shut down 8 hours, within the 0.5-1 hour time of cold start-up. 24 hours downtimes, within 1-2 hour, can recovering nominal situation, startup can enter oxygen supply operating mode.
2) flexible adjustment, smooth running. It is cold that external cooling method achieves benefit timely, quick, accurate. Mending cold does not affect rectification operating mode, mends cold route short. Therefore flexible adjustment, smooth running.
3) change tradition space division gaseous state and mend cold mode, adopt liquid to mend cold. Temperature is low, and cold is big, it is possible to increases reflux ratio and improves distillation process, improves separation efficiency.
4) a tower multimachine configuration is adopted, by startup-shutdown air compressor machine, feed change tolerance, it is achieved divide gear to adjust load on a large scale. Total power consumption linearly changes with yield, and unit consumption remains unchanged.
5) woods German system SAPMAC method is with oxygen for working medium, and refrigerating efficiency is high.
6) rectification air separation column diameter with pressure can reduce more than half, and large-scale and Extra large air separation plant manufactures a difficult problem and is readily solved.
7) decompressor run up is eliminated. Air separation column is made up of static equipment completely, eliminates mechanical breakdown, and safety and stability is higher.
Above, although describe several embodiments of the invention, but these embodiments are intended only as what example proposed, are not intended to limit the scope of the present invention. For the embodiment that these are new, it is possible to be carried out in other various modes, without departing from the scope of idea of the invention, it is possible to carry out various omission, displacement and change. These embodiments and its deformation, while being contained in the scope of the present invention and main idea, be also contained in invention and the equivalency range thereof of record in claims.
Claims (5)
1. external-cooling type single-stage rectification air separation unit, it is characterised in that include king-tower, secondary tower, condenser/evaporator, heat exchanger, recycle compressor, liquid oxygen pump, choke valve and conveyance conduit;
Described condenser/evaporator includes main condenser vaporizer, argon condenser/evaporator, and wherein said main condenser vaporizer and argon condenser/evaporator are separately positioned on the top of described king-tower and secondary tower; The bottom of described secondary tower connects with the middle part of king-tower hypomere;
Described heat exchanger includes oxygen heat exchanger, nitrogen heat exchanger, crude argon heat exchanger, circulation heat exchanger;
The middle part of described king-tower is provided with raw air charging aperture, raw air enters king-tower by conveyance conduit after being cooled to saturation temperature in advance respectively through described oxygen heat exchanger, nitrogen heat exchanger and crude argon heat exchanger in the middle part of described king-tower, liquid oxygen input port it is provided with bottom described king-tower, inject liquid oxygen from this liquid oxygen input port, nitrogen is from the Base top contact of king-tower and by reclaiming after nitrogen heat exchanger re-heat to room temperature; Liquid is back to bottom king-tower and isolates liquid oxygen is entered the solidifying vaporizer of master at king-tower top and the argon condenser/evaporator at secondary tower top by the outside conveyance conduit with choke valve and liquid oxygen pump arranged of king-tower, as the coolant of these two condenser/evaporators;
In king-tower, part nitrogen enters main solidifying vaporizer and carries out heat exchange with liquid oxygen coolant, liquid oxygen coolant is converted into after gas evaporation is discharged and enters described circulation heat exchanger, and pressurizeed by described recycle compressor, the laggard tower bottom tower reactor of becoming owner of of pre-cooling rises, the circulating oxygen rectification risen bottom nitrogen condensing reflux and king-tower;
The Argon fraction being positioned at king-tower hypomere enters secondary tower, in secondary tower, argon rises to secondary tower tower top, by reclaiming after described argon heat exchanger re-heat to room temperature after part extraction, all the other continue condensing reflux, liquid oxygen, in argon condenser/evaporator, is converted into oxygen after participating in heat exchange, reclaims again through after described oxygen heat exchanger re-heat to room temperature.
2. external-cooling type single-stage rectification air separation unit according to claim 1, it is characterised in that described king-tower top is provided with liquid nitrogen input port.
3. external-cooling type single-stage rectification air separation unit according to claim 1, it is characterised in that described argon condenser/evaporator is provided with liquid argon input port.
4. external-cooling type single-stage rectification air separation unit according to claim 1, it is characterised in that the loop that described king-tower tower reactor connects with the solidifying vaporizer of described master is provided with choke valve, and the loop connected with argon condenser/evaporator is provided with reflux inlet and described liquid oxygen pump.
5. external-cooling type single-stage rectification air separation unit according to claim 1, it is characterised in that described oxygen heat exchanger, nitrogen heat exchanger and argon heat exchanger are plate type heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521049831.4U CN205300115U (en) | 2015-12-16 | 2015-12-16 | Separately cooling formula single -stage rectification air separation device |
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| CN201521049831.4U CN205300115U (en) | 2015-12-16 | 2015-12-16 | Separately cooling formula single -stage rectification air separation device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423703A (en) * | 2015-12-16 | 2016-03-23 | 新疆天辰气体有限公司 | External cooling type single rectification air separation device and method |
| CN108641750A (en) * | 2018-05-09 | 2018-10-12 | 天津市天地创智科技发展有限公司 | A kind of dry gas piece-rate system dry gas piece-rate system and separation method based on argon circularly cooling |
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2015
- 2015-12-16 CN CN201521049831.4U patent/CN205300115U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423703A (en) * | 2015-12-16 | 2016-03-23 | 新疆天辰气体有限公司 | External cooling type single rectification air separation device and method |
| WO2017101776A1 (en) * | 2015-12-16 | 2017-06-22 | 新疆天辰深冷技术有限公司 | External cooling single-stage rectification air separation device and method |
| CN105423703B (en) * | 2015-12-16 | 2017-08-25 | 新疆天辰气体有限公司 | External-cooling type single-stage rectifying space division system |
| CN108641750A (en) * | 2018-05-09 | 2018-10-12 | 天津市天地创智科技发展有限公司 | A kind of dry gas piece-rate system dry gas piece-rate system and separation method based on argon circularly cooling |
| CN108641750B (en) * | 2018-05-09 | 2023-04-25 | 天津市天地创智科技发展有限公司 | Dry gas separation system and separation method based on argon circulation refrigeration |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20201216 |