JP5244491B2 - 空気分離装置 - Google Patents
空気分離装置 Download PDFInfo
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- JP5244491B2 JP5244491B2 JP2008195074A JP2008195074A JP5244491B2 JP 5244491 B2 JP5244491 B2 JP 5244491B2 JP 2008195074 A JP2008195074 A JP 2008195074A JP 2008195074 A JP2008195074 A JP 2008195074A JP 5244491 B2 JP5244491 B2 JP 5244491B2
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- 238000000926 separation method Methods 0.000 title claims description 43
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 315
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 213
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 159
- 239000007788 liquid Substances 0.000 claims description 59
- 229910052757 nitrogen Inorganic materials 0.000 claims description 51
- 229910001882 dioxygen Inorganic materials 0.000 claims description 47
- 238000000605 extraction Methods 0.000 claims description 28
- 239000002994 raw material Substances 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 13
- 238000009835 boiling Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 33
- 239000001301 oxygen Substances 0.000 description 33
- 229910052760 oxygen Inorganic materials 0.000 description 33
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000010992 reflux Methods 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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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
- F25J3/04472—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 using the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages
- F25J3/04496—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 using the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages for compensating variable air feed or variable product demand by alternating between periods of liquid storage and liquid assist
- F25J3/04503—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 using the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages for compensating variable air feed or variable product demand by alternating between periods of liquid storage and liquid assist by exchanging "cold" between at least two different cryogenic liquids, e.g. independently from the main heat exchange line of the air fractionation and/or by using external alternating storage systems
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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
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
- F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
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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
- F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
- F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
- F25J3/04224—Cores associated with a liquefaction or refrigeration cycle
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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
- F25J3/04351—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 nitrogen
- F25J3/04357—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 nitrogen 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
- F25J3/04472—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 using the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages
- F25J3/04496—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 using the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages for compensating variable air feed or variable product demand by alternating between periods of liquid storage and liquid assist
- F25J3/04503—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 using the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages for compensating variable air feed or variable product demand by alternating between periods of liquid storage and liquid assist by exchanging "cold" between at least two different cryogenic liquids, e.g. independently from the main heat exchange line of the air fractionation and/or by using external alternating storage systems
- F25J3/04509—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 using the cold from cryogenic liquids produced within the air fractionation unit and stored in internal or intermediate storages for compensating variable air feed or variable product demand by alternating between periods of liquid storage and liquid assist by exchanging "cold" between at least two different cryogenic liquids, e.g. independently from the main heat exchange line of the air fractionation and/or by using external alternating storage systems within the cold part of the air fractionation, i.e. exchanging "cold" within the fractionation and/or main heat exchange line
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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
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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
- F25J2250/00—Details related to the use of reboiler-condensers
- F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
- F25J2250/42—One fluid being nitrogen
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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
- F25J2250/00—Details related to the use of reboiler-condensers
- F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
- F25J2250/50—One fluid being oxygen
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- Separation By Low-Temperature Treatments (AREA)
Description
(A)上記供給手段を用いて、上記液体酸素貯留タンク内の液体酸素を上記液化手段の熱交換器に供給し、上記窒素ガス取出路の放出弁を閉じて、上記窒素ガス供給路の切換弁を開けることにより、上記精留塔から取り出された窒素ガスの全量を、上記窒素ガス圧縮機で圧縮した後、上記液化手段の窒素ガス導入路および窒素ガス供給路を通じて、上記熱交換器に導入するとともに、上記熱交換器内で、上記液体酸素および寒冷供給路内の寒冷と、上記窒素ガス導入路内および窒素ガス供給路内の窒素ガスとを熱交換させることにより、上記窒素ガスを液化させ液体酸素を気化させて、必要量の酸素ガスを外部に供給する酸素ガス供給状態。
(B)上記液体酸素の供給手段を停止し、上記窒素ガス取出路の放出弁を開放し、窒素ガス供給路の切換弁を閉じることにより、上記精留塔から取り出された窒素ガスの一部を、上記液化手段の窒素ガス導入路を通じて上記熱交換器に導入し、この窒素ガスと上記寒冷供給路内の寒冷とを熱交換させるとともに、上記精留塔から取り出された窒素ガスのうち、上記液化手段で使用されない残余の窒素ガスを、上記窒素ガス取出路の放出弁から外部に放出する酸素ガス供給停止状態。
また、本発明の空気分離装置は、上記精留塔で製造された窒素ガスを上記精留塔から取り出す窒素ガス取出路と、この窒素ガス取出路により取り出された窒素ガスを液化する液化手段と、上記窒素ガス取出路により取り出された窒素ガスのうち上記液化手段に供給されなかった残部の窒素ガスを外部に放出する放出弁と、上記液体酸素貯留タンクに溜まる液体酸素を取り出して上記液化手段に冷媒として供給する供給手段と、上記液化手段で気化した酸素ガスを取り出す酸素ガス取出路とを備え、上記液化手段として、熱交換器と、上記窒素ガス取出路により取り出された窒素ガスを圧縮する窒素ガス圧縮機と、上記窒素ガス圧縮機で圧縮された窒素ガスを熱交換器に導入する窒素ガス導入路と、上記熱交換器内を通る窒素ガスの一部を取り出して寒冷を発生させる膨張タービンと、上記膨張タービンで発生した寒冷および熱交換器を経由した窒素ガスの残部を貯留するフラッシュドラムと、上記フラッシュドラム内の寒冷を上記熱交換器に供給する寒冷供給路と、上記フラッシュドラム内の寒冷を液体窒素貯槽を経由して上記精留塔に供給する液体窒素供給パイプと、上記窒素ガス導入路から分岐して、上記圧縮された窒素ガスを熱交換器を経由してフラッシュドラムに供給する窒素ガス供給路と、この窒素ガス供給路に設けられた切換弁とを備え、上記精留塔で常時製造される窒素ガスを、この精留塔から、窒素ガス取出路により常時取り出すようにしている。
さらに、上記空気分離装置は、上記供給手段と上記切換弁および放出弁により、酸素ガスの需要に応じて、(A)上記液体酸素貯留タンク内の液体酸素を、上記供給手段を用いて上記液化手段の熱交換器に供給し、上記窒素ガス取出路の放出弁を閉じて、上記窒素ガス供給路の切換弁を開けることにより、上記精留塔から取り出された窒素ガスの全量を、上記窒素ガス圧縮機で圧縮した後、上記液化手段の窒素ガス導入路および窒素ガス供給路を通じて、上記熱交換器に導入するとともに、上記熱交換器内で、上記液体酸素および寒冷供給路内の寒冷と、上記窒素ガス導入路内および窒素ガス供給路内の窒素ガスとを熱交換させることにより、上記窒素ガスを液化させ液体酸素を気化させて、必要量の酸素ガスを外部に供給する酸素ガス供給状態と、(B)上記液体酸素の供給手段を停止し、上記窒素ガス取出路の放出弁を開放し、窒素ガス供給路の切換弁を閉じて、上記精留塔から取り出された窒素ガスの一部を、上記液化手段の窒素ガス導入路を通じて上記熱交換器に導入し、この窒素ガスと上記寒冷供給路内の寒冷とを熱交換させるとともに、上記精留塔から取り出された窒素ガスのうち、上記液化手段で使用されない残余の窒素ガスを、上記窒素ガス取出路の放出弁から外部に放出する酸素ガス供給停止状態とを、交互に切り換え可能になっている。
したがって、精留条件を一定に保持した状態で精留塔を運転し、一定量の液体酸素を精留塔から常時取り出して液体酸素貯留タンクに溜めるとともに、一定量の窒素ガスを精留塔から常時取り出すことができ、液体酸素,窒素ガスがいつでも利用可能な状態にある。そこで、酸素ガスが必要なときに、上記液体酸素貯留タンク内の液体酸素を供給手段により液化手段に供給し、この液化手段内の窒素ガスと熱交換させ、液体酸素の冷熱により窒素ガスを液化させて液体窒素を生成させるとともに、窒素ガスの温熱により液体酸素を気化させて必要量の酸素ガスを生成させ、この生成させた酸素ガスを酸素ガス取出路により取り出して、上記需要に対応できるようにしている。
4 液体酸素供給ポンプ
17 熱交換器
Claims (2)
- 外部から取り入れた原料空気を沸点差を利用して深冷液化分離し液体酸素および窒素ガスを製造する精留塔と、上記精留塔で製造された液体酸素を上記精留塔から取り出す液体酸素取出路と、この液体酸素取出路により取り出された液体酸素を溜める液体酸素貯留タンクと、上記精留塔で製造された窒素ガスを上記精留塔から取り出す窒素ガス取出路と、この窒素ガス取出路により取り出された窒素ガスを液化する液化手段と、上記窒素ガス取出路に取り付けられた放出弁と、上記液体酸素貯留タンクに溜まる液体酸素を取り出して上記液化手段に冷媒として供給する供給手段と、上記液化手段で気化した酸素ガスを取り出す酸素ガス取出路と、
上記液化手段として、熱交換器と、上記窒素ガス取出路により取り出された窒素ガスを圧縮する窒素ガス圧縮機と、上記窒素ガス圧縮機で圧縮された窒素ガスを熱交換器に導入する窒素ガス導入路と、上記熱交換器内を通る窒素ガスの一部を取り出して寒冷を発生させる膨張タービンと、上記膨張タービンで発生した寒冷および熱交換器を経由した窒素ガスの残部を貯留するフラッシュドラムと、上記フラッシュドラム内の寒冷を上記熱交換器に供給する寒冷供給路と、上記フラッシュドラム内の寒冷を液体窒素貯槽を経由して上記精留塔に供給する液体窒素供給パイプと、上記窒素ガス導入路から分岐して、上記圧縮された窒素ガスを熱交換器を経由してフラッシュドラムに供給する窒素ガス供給路と、この窒素ガス供給路に設けられた切換弁と、を備え、
酸素ガスの需要に応じて、上記供給手段と上記切換弁および放出弁により、下記(A)の酸素ガス供給状態と下記(B)の酸素ガス供給停止状態のいずれかに切り換え可能になっていることを特徴とする空気分離装置。
(A)上記供給手段を用いて、上記液体酸素貯留タンク内の液体酸素を上記液化手段の熱交換器に供給し、上記窒素ガス取出路の放出弁を閉じて、上記窒素ガス供給路の切換弁を開けることにより、上記精留塔から取り出された窒素ガスの全量を、上記窒素ガス圧縮機で圧縮した後、上記液化手段の窒素ガス導入路および窒素ガス供給路を通じて、上記熱交換器に導入するとともに、上記熱交換器内で、上記液体酸素および寒冷供給路内の寒冷と、上記窒素ガス導入路内および窒素ガス供給路内の窒素ガスとを熱交換させることにより、上記窒素ガスを液化させ液体酸素を気化させて、必要量の酸素ガスを外部に供給する酸素ガス供給状態。
(B)上記液体酸素の供給手段を停止し、上記窒素ガス取出路の放出弁を開放し、窒素ガス供給路の切換弁を閉じることにより、上記精留塔から取り出された窒素ガスの一部を、上記液化手段の窒素ガス導入路を通じて上記熱交換器に導入し、この窒素ガスと上記寒冷供給路内の寒冷とを熱交換させるとともに、上記精留塔から取り出された窒素ガスのうち、上記液化手段で使用されない残余の窒素ガスを、上記窒素ガス取出路の放出弁から外部に放出する酸素ガス供給停止状態。 - 上記液化手段のフラッシュドラムと液体窒素貯槽の間に、この液体窒素貯槽内の液面高さを調節する液面調節弁が配設されている請求項1記載の空気分離装置。
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