CN102052105A - Brake method of expansion machine and air separation unit - Google Patents
Brake method of expansion machine and air separation unit Download PDFInfo
- Publication number
- CN102052105A CN102052105A CN2010106184725A CN201010618472A CN102052105A CN 102052105 A CN102052105 A CN 102052105A CN 2010106184725 A CN2010106184725 A CN 2010106184725A CN 201010618472 A CN201010618472 A CN 201010618472A CN 102052105 A CN102052105 A CN 102052105A
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- China
- Prior art keywords
- decompressor
- gas
- air
- purifying machine
- braking method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—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.
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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
- F25J3/04181—Regenerating the adsorbents
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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.
- F25J3/04381—Details relating to the work expansion, e.g. process parameter etc. using work extraction by mechanical coupling of compression and expansion so-called companders
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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
- F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
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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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
- F25J2205/66—Regenerating the adsorption vessel, e.g. kind of reactivation gas
- F25J2205/70—Heating the adsorption vessel
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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
- F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being nitrogen
Abstract
The invention discloses a brake method of an expansion machine. The method is characterized in that air produced by an air separation unit is used as a brake gas of the expansion machine. The method of the invention avoids the influence of atmospheric environment on the brake operation of the expansion machine so that the expansion machine can continuously run all year around without influencing the refrigerating effect, the operation state of the expansion machine is more reliable to achieve the maintenance-free aim, and the clean gas after brake can be still input into a purifying machine to be continuously utilized. The heat generated in the brake process can be reutilized, electricity consumed by the purifying machine is reduced, and the triple aims of saving energy, saving air filters and freeing maintenance are achieved.
Description
Technical field
The present invention relates to a kind of braking method and a kind of air separation facility of decompressor.
Background technique
The rotating speed of small-sized decompressor is generally per minute several thousand to several ten thousand commentaries on classics, the angle that the rotor of decompressor utilizes bearing shell to form, allow clean air possess the strength of supporting, allow the axle suspension of high speed rotating float in the middle of the bearing shell, and the axle that runs up must there be the mode of suitable braking.
For this class gas supporting bearing shell, prior art often adopts air damping.Owing to rotating speed is very high, just must be very clean as the air of braking, otherwise airborne particle enters on the impeller of high speed rotating just damage impeller, destruction dynamic balancing easily.Therefore conventional technology is exactly the inlet at brake air, and high-precision air filter is installed.
The shortcoming of this method is affected by environment easily, as air dirt or rainy day, all can influence the clean level of air, and the requirement rising to air filter has increased operating cost.Not thorough as filtering, also can influence the braking of decompressor.
Air-separating plant is called for short air separation facility, generally is to adopt the Cryogenic air separation technology.The Cryogenic air separation technology is meant: earlier to air compress, purifying, expansion cooling be until being cooled to liquefaction, utilize the boiling point difference of different component in the air (oxygen, nitrogen etc.), the part that air carries out is repeatedly evaporated and partial condensation, thereby the technology of component rectifying separation such as oxygen, nitrogen.
In the existing air separation facility, need use electric heater to heat during purifying machine work.The volume of purifying machine depends on the volume with electric heater.Molecular sieve cross-section area in the purifying machine need match with the purifying machine inner chamber.The purifying machine volume is big more, and the molecular sieve that needs is also big more.After using, purifying machine needs to use clean gas to carry out Regeneration Treatment.Because, when air flows into sorbent, begin to have only the sorbent of bottom section to participate in absorption, be called adsorption zone, the sorbent on top is not participated in absorption as yet, and molecular sieve moisture content of outlet content is zero.Along with duration of ventilation increases, bottom adsorbents adsorb capacity is saturated, moves on the adsorption zone, sorbent can not effectively all adsorb airborne moisture fall, at this time need sorbent to regenerate, regeneration is divided into two stages: at first being the parsing of heating, is cold blowing then.
Air separation facility of the prior art, the clean gas of its production or being used to transport to the gas place is used for such as predominant uses such as shielding gas such as chemical reactions, or be used for purifying machine regeneration, be difficult to residual gas.
Summary of the invention
The objective of the invention is provides a kind of and avoids waste in order to overcome deficiency of the prior art, and the braking method of the decompressor of clean gas can be provided for decompressor.
For realizing above purpose, the present invention is achieved through the following technical solutions:
The braking method of decompressor is characterized in that, utilizes the brake gas of the gas of air separation facility production as decompressor.
Preferably, utilize the brake gas of the nitrogen of air separation facility production as decompressor.
Preferably, utilize other purposes to use the brake gas of remaining nitrogen as decompressor.Described other purposes is meant the non-purposes that is used for the decompressor braking, such as transporting to the purposes and the purposes that be used for purifying machine regeneration of gas place as the chemical reaction shielding gas.
It is preferably, described that to utilize the gas of air separation facility production be the gas that air is produced after overcompression, purifying, rectification process.
Preferably, air compresses after the processing, before the purification process, carries out processed.
Preferably, after the purified processing, airborne grain graininess is less than 3 microns.
Preferably, in rectifying column air is carried out rectification process, treatment temperature is smaller or equal to-180 ℃.
Preferably, the gas that rectifying produces, by the expansion pressure recovery can after be sent to the decompressor braking.
Preferably, described pre-processed is to use refrigerating machine that air is carried out processed.
Preferably, be used for being used for purifying machine regeneration in the gas input purifying machine after the decompressor braking.
Another object of the present invention provides a kind of air separation facility, comprises purifying machine and rectifying column, and purifying machine and rectifying column UNICOM is characterized in that, also comprises cooling device and purifying machine UNICOM, and the air after cooling device is handled can be transported to purifying machine; Described rectifying column and decompressor UNICOM, the gas of rectifying column production can be transported to decompressor; Decompressor and purifying machine UNICOM, the expansion brake gas in the decompressor can be transported to purifying machine
The present invention has following advantage: avoided the influence of atmosphere environment to the decompressor brake operating, from then on can not stop decompressor the whole year, do not influenced cool producing capacity; The running state of decompressor is more reliable, has realized non-maintaining target.Clean gas after the braking still can be imported and continue in the purifying machine to utilize.The heat that produces in braking process can utilize once more, and the needed power consumption of purifying machine reduces, and can reach energy-conservation, saves empty filter, non-maintaining triple purposes.
Description of drawings
Fig. 1 is the decompressor braking principle figure in the inventive method.
Fig. 2 is the air separation facility structural representation among the present invention
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is elaborated:
Nitrogen with air separation facility production is the example explanation as the decompressor brake gas.
As depicted in figs. 1 and 2, reach the pressure of setting after the compressed machine compression of air, pressure value requires to determine according to actual production.
Adopt cooling device to carry out pre-processed then, air is lowered the temperature to dewater, improve the air quality that enters rectifying column.Cooling device can adopt the one or more combination in air cooling tower, water-cooling tower, water supply pump and the refrigerating machine to use.Air temperature is reduced to the 5-6 degree after pre-dehydration, and density increases, and water content tails off.
Carry out purification process again, air enters from the purifying machine bottom, adsorb to fall by the activated alumina most of moisture that it is contained earlier, and then by molecular sieve adsorption carbon dioxide, acetylene and other hydrocarbon.
Through the air behind pre-dehydration, the purifying, its dust granule degree is less than 3 microns.
The clean gas of purified processing enters in the rectifying column and carry out rectification process under-180 ℃ of temperature.Air separablely goes out pure nitrogen gas after rectification process, the pure nitrogen gas of production mainly is sent to the gas place for use, and another part is sent to purification devices and is used for purification devices regeneration.The useless nitrogen pressure of residue that exceeds use amount can be transported to the brake gas of decompressor as decompressor after reclaiming.The useless nitrogen gas pressure of residue can not reclaim also and can realize purpose of the present invention.
Through the useless nitrogen that produces after the rectification process, its degree of purity is higher, can not contain the large particle dust, is sent to decompressor and can satisfies usage requirement as brake gas.Both avoid the decompressor braking affected by environment, reclaimed nitrogen product again, cost-saved.
As the useless nitrogen after the use of decompressor brake gas, its temperature raises, and has certain heat energy.After transporting in the purifying machine, can be used for purifying machine regeneration.
The present invention adopts cooling device to reduce airborne water content, therefore, can reduce the water separation capability requirement of purifying machine.Correspondingly, the electric heater in the purifying machine will reduce, and the purifying machine volume can reduce.Reduce the purifying machine behind the volume, its molecular sieve also can correspondingly reduce, and the purifying machine useless nitrogen of needed cleaning of regenerating is also few naturally.Therefore, the nitrogen that rectifier unit produces can some remain, thereby the gas of braking can be provided for decompressor.
From overall situation, the present invention adopts the brake gas of the useless nitrogen of remaining cleaning as decompressor.Total energy consumption decreases, because the cooling device power consumption that increases is less than the electric heater power consumption that reduces, and the useless nitrogen of the cleaning after the braking is that hot useless nitrogen can be used for purifying regeneration once more, can reduce the power consumption of the used electric heater of purifying relatively.The purifying machine volume reduces, the molecular sieve consumption also reduces, so on the basis that also decreases of device fabrication expense, has created condition for utilizing clean useless nitrogen.
Unnecessary useless nitrogen is used for the braking of small-sized decompressor, has cancelled air filter, not only avoided the consumption of air filter, the more important thing is to allow environmental factor and decompressor can normally move irrelevant fully.Thereby really deal with problems, realized important breakthrough.
Embodiment among the present invention only is used for that the present invention will be described, does not constitute the restriction to the claim scope, and other substituting of being equal in fact that those skilled in that art can expect are all in protection domain of the present invention.
Claims (11)
1. the braking method of decompressor is characterized in that, utilizes the brake gas of the gas of air separation facility production as decompressor.
2. the braking method of decompressor according to claim 1 is characterized in that, utilizes the brake gas of the nitrogen of air separation facility production as decompressor.
3. the braking method of decompressor according to claim 2 is characterized in that, utilizes other purposes to use the brake gas of remaining nitrogen as decompressor.
4. the braking method of decompressor according to claim 1 is characterized in that, described to utilize the gas of air separation facility production be the gas that air is produced after overcompression, purifying, rectification process.
5. the braking method of decompressor according to claim 5 is characterized in that, air compresses after the processing, before the purification process, carries out processed.
6. according to the braking method of claim 5 or 6 described decompressors, it is characterized in that after the purified processing, airborne grain graininess is less than 3 microns.
7. the braking method of decompressor according to claim 5 is characterized in that, in rectifying column air is carried out rectification process, and treatment temperature is smaller or equal to-180 ℃.
8. the braking method of decompressor according to claim 5 is characterized in that, the gas that rectifying produces, by the expansion pressure recovery can after be sent to the decompressor braking.
9. the braking method of decompressor according to claim 5 is characterized in that, described pre-processed is to use cooling device that air is carried out processed.
10. the braking method of decompressor according to claim 1 is characterized in that, is used for being used for purifying machine regeneration in the gas input purifying machine after decompressor is braked.
11. an air separation facility comprises purifying machine and rectifying column, purifying machine and rectifying column UNICOM is characterized in that, also comprise cooling device and purifying machine UNICOM, and the air after cooling device is handled can be transported to purifying machine; Described rectifying column and decompressor UNICOM, the gas of rectifying column production can be transported to decompressor; Decompressor and purifying machine UNICOM, the expansion brake gas in the decompressor can be transported to purifying machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106184725A CN102052105A (en) | 2010-12-30 | 2010-12-30 | Brake method of expansion machine and air separation unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106184725A CN102052105A (en) | 2010-12-30 | 2010-12-30 | Brake method of expansion machine and air separation unit |
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| CN102052105A true CN102052105A (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010106184725A Pending CN102052105A (en) | 2010-12-30 | 2010-12-30 | Brake method of expansion machine and air separation unit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220386A (en) * | 1997-11-26 | 1999-06-23 | 北京市奥达石化新技术开发中心 | Process for separating high pure nitrogen from air |
| US20040089021A1 (en) * | 2002-11-13 | 2004-05-13 | Patrick Le Bot | Integrated air separation process and apparatus |
| JP2005257108A (en) * | 2004-03-09 | 2005-09-22 | Air Water Inc | Air separating method and device used for the same |
| US20080115531A1 (en) * | 2006-11-16 | 2008-05-22 | Bao Ha | Cryogenic Air Separation Process and Apparatus |
| CN101332399A (en) * | 2008-04-18 | 2008-12-31 | 上海加力气体有限公司 | Waste-gas braking method |
| CN101334230A (en) * | 2007-07-20 | 2008-12-31 | 上海加力气体有限公司 | N -type mode gas supply energy-saving process |
-
2010
- 2010-12-30 CN CN2010106184725A patent/CN102052105A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220386A (en) * | 1997-11-26 | 1999-06-23 | 北京市奥达石化新技术开发中心 | Process for separating high pure nitrogen from air |
| US20040089021A1 (en) * | 2002-11-13 | 2004-05-13 | Patrick Le Bot | Integrated air separation process and apparatus |
| JP2005257108A (en) * | 2004-03-09 | 2005-09-22 | Air Water Inc | Air separating method and device used for the same |
| US20080115531A1 (en) * | 2006-11-16 | 2008-05-22 | Bao Ha | Cryogenic Air Separation Process and Apparatus |
| CN101334230A (en) * | 2007-07-20 | 2008-12-31 | 上海加力气体有限公司 | N -type mode gas supply energy-saving process |
| CN101332399A (en) * | 2008-04-18 | 2008-12-31 | 上海加力气体有限公司 | Waste-gas braking method |
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Application publication date: 20110511 |