CA2111140A1 - The separation of gas mixtures - Google Patents
The separation of gas mixturesInfo
- Publication number
- CA2111140A1 CA2111140A1 CA002111140A CA2111140A CA2111140A1 CA 2111140 A1 CA2111140 A1 CA 2111140A1 CA 002111140 A CA002111140 A CA 002111140A CA 2111140 A CA2111140 A CA 2111140A CA 2111140 A1 CA2111140 A1 CA 2111140A1
- Authority
- CA
- Canada
- Prior art keywords
- product gas
- gas mixture
- feed
- feed gas
- separation
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
- F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
- F17C9/04—Recovery of thermal energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0462—Temperature swing adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
-
- 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
- F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
- F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
-
- 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
- F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
- F25J3/04054—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of air
-
- 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
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
-
- 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
- F25J3/04836—Variable air feed, i.e. "load" or product demand during specified periods, e.g. during periods with high respectively low power costs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/10—Nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40001—Methods relating to additional, e.g. intermediate, treatment of process gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/416—Further details for adsorption processes and devices involving cryogenic temperature treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/014—Nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/031—Air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
- F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
- F17C2225/0107—Single phase
- F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
- F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
- F17C2225/0146—Two-phase
- F17C2225/0153—Liquefied gas, e.g. LPG, GPL
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/01—Propulsion of the fluid
- F17C2227/0128—Propulsion of the fluid with pumps or compressors
- F17C2227/0157—Compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0302—Heat exchange with the fluid by heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0367—Localisation of heat exchange
- F17C2227/0388—Localisation of heat exchange separate
- F17C2227/0393—Localisation of heat exchange separate using a vaporiser
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/01—Purifying the fluid
- F17C2265/015—Purifying the fluid by separating
-
- 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
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/42—Nitrogen
-
- 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
- F25J2230/02—Compressor intake arrangement, e.g. filtering or cooling
-
- 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
-
- 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
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
- F25J2270/904—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by liquid or gaseous cryogen in an open loop
-
- 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
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/62—Details of storing a fluid in a tank
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A process is disclosed for a feed gas mixture containing a product gas is first compressed prior to delivery to a unit for the separation of the product gas from the feed gas mixture and in which a reservoir of the product gas in liquid phase is available for augmenting the supply of product gas from the separation unit during peak demand. The product gas is vaporized in liquid phase by heat exchange with the feed gas mixture prior to the compression of the feed gas mixture.
A process is disclosed for a feed gas mixture containing a product gas is first compressed prior to delivery to a unit for the separation of the product gas from the feed gas mixture and in which a reservoir of the product gas in liquid phase is available for augmenting the supply of product gas from the separation unit during peak demand. The product gas is vaporized in liquid phase by heat exchange with the feed gas mixture prior to the compression of the feed gas mixture.
Description
92B14~/PG
THE SEPARATION OF GAS MIXTURES
The present invention relates to processes in which a product gas forming a constituent of a feed gas mixture is separated for use i~ an end user's process. More particularly, the present invention relates to a process in which a product gas is separated from a feed gas mix~ure but where, to meet peak demand, a vessel containing the product gas in liquid phase is available to augment the product gas being produced by the separation process.
In, for example, a pressure swing adsorption (PSA) plant for the production of nitrogen from air a bed of adsorbent contained within a pressure vessel is put through a cycle which includes an adsorption step during which feed air is initially compressed before being pumped through the bed under pressure where most of the oxygen and a proportion of the nitrogen and substantially all of the carbon dioxide and water vapour in the feed air are adsorbed and a nitrogen rich product gas is supplied from the outlet of the bed. Frequently, the nitrogen rich product gas is passed first to a nitrogen receiver vessel from which it is subsequently drawn by the end user of the product gas. It is common in such processes to have a supply of liquid nitrogen available to augment the product gas leaving the nitrogen receiver vessel during periods of peak demand by the ultimate user of the nitrogen.
It is an aim of the present invention to provide in a process where a feed gas mixture containing a product gas is first compressed prior to delivery to a separation unit, steps whereby the output of the compressor and hence the separation plant is enhanced during periods of high demand.
According to the present invention, in a process where a feed gas mixture containing a product gas is first compressed prior to delivery to a unit for the separation of the product gas from the feed gas mixture and in -which a reservoir of the product gas in li~uid phase is available for augmenting the supply of product gas from the separation unit during peak demand; the step of vaporising the product gas in liquid phase by heat exchange with the feed gas mixture prior to the compression of the feed gas mixture.
THE SEPARATION OF GAS MIXTURES
The present invention relates to processes in which a product gas forming a constituent of a feed gas mixture is separated for use i~ an end user's process. More particularly, the present invention relates to a process in which a product gas is separated from a feed gas mix~ure but where, to meet peak demand, a vessel containing the product gas in liquid phase is available to augment the product gas being produced by the separation process.
In, for example, a pressure swing adsorption (PSA) plant for the production of nitrogen from air a bed of adsorbent contained within a pressure vessel is put through a cycle which includes an adsorption step during which feed air is initially compressed before being pumped through the bed under pressure where most of the oxygen and a proportion of the nitrogen and substantially all of the carbon dioxide and water vapour in the feed air are adsorbed and a nitrogen rich product gas is supplied from the outlet of the bed. Frequently, the nitrogen rich product gas is passed first to a nitrogen receiver vessel from which it is subsequently drawn by the end user of the product gas. It is common in such processes to have a supply of liquid nitrogen available to augment the product gas leaving the nitrogen receiver vessel during periods of peak demand by the ultimate user of the nitrogen.
It is an aim of the present invention to provide in a process where a feed gas mixture containing a product gas is first compressed prior to delivery to a separation unit, steps whereby the output of the compressor and hence the separation plant is enhanced during periods of high demand.
According to the present invention, in a process where a feed gas mixture containing a product gas is first compressed prior to delivery to a unit for the separation of the product gas from the feed gas mixture and in -which a reservoir of the product gas in li~uid phase is available for augmenting the supply of product gas from the separation unit during peak demand; the step of vaporising the product gas in liquid phase by heat exchange with the feed gas mixture prior to the compression of the feed gas mixture.
- 2 ~ O
Preferably, the feed gas mixture is in direct heat exchange with the product gas in l;quid phase.
Alternatively, a fluid may be used in a closed system which is arranged to be in heat exchange relation first with the feed gas mixture and subsequently with the product gas in liquid phase.
Embodiments of the invention will now be described, by way of example, reference being made to the Figures of the accompanying diagrammatic drawings in which:-Figure 1 is a schematic view of a plant for the production of a product gasfrom a feed gas mixture containing said product gas; and Figure , is a schematic view similar to ~igure 1 but illustrating a modification thereof.
As shown in Figure 1 a plant for the separation of nitrogen from air comprises a feed air pipeline 2 which communicates with the inlet of a compressor 4. The feed air line forms one pass of a heat exchanger 14.
The outlet of compressor 4 communicates in turn with an air separation unit in the form of a PSA unit 6. From the unit 6 a nitrogen rich product gas flows either directly to an end user's process or to a reservoir ~not shown). Forming part of the plant is a pressure vessel 10 containing liquid nitrogen at substantially the same purity level as the product gas which emanates from the air separation unit 6. A pipeline 12 extends from the vessel 10 through the heat exchanger 14 and hence joins the pipeline 8.
It will be apparent, that in use the feed air prior to reaching the compressor 4 via the pipeline 2 will be in heat exchange relationship with the fluid in the reservoir 10. This will have the effect of enhancing the output from the compressor 4 by making more dense the feed air whilst at the same time vaporising the liquid in the reservoir 10 during peak demand.
By doing this the amount of relatively expensive liquid nitrogen that is used to support the peak demand will be reduced.
:~
.
, ~ .
~ ~ ~ a ~2B148/PG
~.. .. .. .. .
Turning now to ~igure 2, where like parts have been given the sa~e reference numerals, the plant for the separat;on of nitrogen from air includes an air feed pipeline Z which communicates with the inlet of an air compressor 4. The outlet from the air compressor 4 communicates with a pipeline 5 which extends through an after cooler 20 and hence to a PSA
nierogen separator 6. A nitrogen rich product gas passes through a pipeline 8 directly to an end user's process or into a nitrogen receiver reservoir (not shown). Located in the pipeline 2 is a pre-cooler 22; and a pipeline 2~s extends between the pre-cooler 22 and the after cooler 20.
Extending from the after cooler 20 is a pipeline 26 which passes initially through a heat exchanger 28 and hence to the pre-cooler 22. A pipeline 12 extends from a presure vessel 10 containing liquid nitrogen through the heat exchanger 28 and joints the pipeline 8.
In use air flows through the feed air pipeline 2 through the pre-cooler 22 and hence to the compressor 4. Compressed air from the compressor 4 flows through the after cooler 20 via pipeline 5 and hence to the PSA separation unit 6. Product gas rich in nitrogen leaves the unit 6 via ~he pipeline 8 either to go directly to a user's process or to enter a nitrogen reservoir (not shown). A fluid, for example, water, flows through a closed circuit system which includes pipeline 26, pre-cooler 22, pipeline 24 and after cooler 20 as well as the heat exchanger 28. During peak production time the l;quid phase product gas in the vessel 10 will pass via pipeline 12 through the heat exchanger 28 and will join the pipeline 8. This flow of gas will chill the water in the closed circuit system and the chilled water will pre-cool the feed air in the pre-cooler 22. The chilled water although warmer in the pipeline 24 will also chill the compressed air in the after cooler 20. The heat picked up by the water in the line 26 will assist in the vaporisation of the liquid phase product gas in the vessel 10 during its passage through the heat exchanger 8.
Although reference has been made to PSA air separation units, it is apparent that any other form of feed gas separation unit could be employed.
For example, a temperature swing adsorption (TSA) unit or a cryogenic gas separation unit.
~ "
,
Preferably, the feed gas mixture is in direct heat exchange with the product gas in l;quid phase.
Alternatively, a fluid may be used in a closed system which is arranged to be in heat exchange relation first with the feed gas mixture and subsequently with the product gas in liquid phase.
Embodiments of the invention will now be described, by way of example, reference being made to the Figures of the accompanying diagrammatic drawings in which:-Figure 1 is a schematic view of a plant for the production of a product gasfrom a feed gas mixture containing said product gas; and Figure , is a schematic view similar to ~igure 1 but illustrating a modification thereof.
As shown in Figure 1 a plant for the separation of nitrogen from air comprises a feed air pipeline 2 which communicates with the inlet of a compressor 4. The feed air line forms one pass of a heat exchanger 14.
The outlet of compressor 4 communicates in turn with an air separation unit in the form of a PSA unit 6. From the unit 6 a nitrogen rich product gas flows either directly to an end user's process or to a reservoir ~not shown). Forming part of the plant is a pressure vessel 10 containing liquid nitrogen at substantially the same purity level as the product gas which emanates from the air separation unit 6. A pipeline 12 extends from the vessel 10 through the heat exchanger 14 and hence joins the pipeline 8.
It will be apparent, that in use the feed air prior to reaching the compressor 4 via the pipeline 2 will be in heat exchange relationship with the fluid in the reservoir 10. This will have the effect of enhancing the output from the compressor 4 by making more dense the feed air whilst at the same time vaporising the liquid in the reservoir 10 during peak demand.
By doing this the amount of relatively expensive liquid nitrogen that is used to support the peak demand will be reduced.
:~
.
, ~ .
~ ~ ~ a ~2B148/PG
~.. .. .. .. .
Turning now to ~igure 2, where like parts have been given the sa~e reference numerals, the plant for the separat;on of nitrogen from air includes an air feed pipeline Z which communicates with the inlet of an air compressor 4. The outlet from the air compressor 4 communicates with a pipeline 5 which extends through an after cooler 20 and hence to a PSA
nierogen separator 6. A nitrogen rich product gas passes through a pipeline 8 directly to an end user's process or into a nitrogen receiver reservoir (not shown). Located in the pipeline 2 is a pre-cooler 22; and a pipeline 2~s extends between the pre-cooler 22 and the after cooler 20.
Extending from the after cooler 20 is a pipeline 26 which passes initially through a heat exchanger 28 and hence to the pre-cooler 22. A pipeline 12 extends from a presure vessel 10 containing liquid nitrogen through the heat exchanger 28 and joints the pipeline 8.
In use air flows through the feed air pipeline 2 through the pre-cooler 22 and hence to the compressor 4. Compressed air from the compressor 4 flows through the after cooler 20 via pipeline 5 and hence to the PSA separation unit 6. Product gas rich in nitrogen leaves the unit 6 via ~he pipeline 8 either to go directly to a user's process or to enter a nitrogen reservoir (not shown). A fluid, for example, water, flows through a closed circuit system which includes pipeline 26, pre-cooler 22, pipeline 24 and after cooler 20 as well as the heat exchanger 28. During peak production time the l;quid phase product gas in the vessel 10 will pass via pipeline 12 through the heat exchanger 28 and will join the pipeline 8. This flow of gas will chill the water in the closed circuit system and the chilled water will pre-cool the feed air in the pre-cooler 22. The chilled water although warmer in the pipeline 24 will also chill the compressed air in the after cooler 20. The heat picked up by the water in the line 26 will assist in the vaporisation of the liquid phase product gas in the vessel 10 during its passage through the heat exchanger 8.
Although reference has been made to PSA air separation units, it is apparent that any other form of feed gas separation unit could be employed.
For example, a temperature swing adsorption (TSA) unit or a cryogenic gas separation unit.
~ "
,
Claims (6)
1. In a process where a feed gas mixture containing a product gas is first compressed prior to delivery to a unit for the separation of the product gas from the feed gas mixture and in a which a reservoir of the product gas in liquid phase is available for augmenting the supply of product gas from the separation unit during peak demand; the step of vaporising the product gas in liquid phase by heat exchange with the feed gas mixture prior to the compression of the feed gas mixture.
2. In a process as claimed in Claim 1, in which the feed gas mixture is in direct heat exchange with the product gas in liquid phase.
3. A process as claimed in Claim 1, in which a fluid in a closed system is arranged to be in heat exchange relationship first with the feed gas mixture and subsequently with the product gas in liquid phase.
4. A process as claimed in any one of Claims 1 to 3, in which the feed gas mixture is air and the product gas is nitrogen.
5. A process as claimed in Claims 3 or 4, in which the fluid in the closed system is water.
6. A process as hereinbefore described with reference to and as illustrated in the Figures of the accompanying drawings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9301240A GB2274407B (en) | 1993-01-22 | 1993-01-22 | The separation of gas mixtures |
GB9301240.9 | 1993-01-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2111140A1 true CA2111140A1 (en) | 1994-07-23 |
Family
ID=10729128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002111140A Abandoned CA2111140A1 (en) | 1993-01-22 | 1993-12-10 | The separation of gas mixtures |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU657645B2 (en) |
CA (1) | CA2111140A1 (en) |
GB (1) | GB2274407B (en) |
ZA (1) | ZA939332B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2728663B1 (en) * | 1994-12-23 | 1997-01-24 | Air Liquide | PROCESS FOR SEPARATING A GASEOUS MIXTURE BY CRYOGENIC DISTILLATION |
FR2862746B1 (en) * | 2003-11-25 | 2007-01-19 | Air Liquide | METHOD AND INSTALLATION OF AIR SEPARATION BY CRYOGENIC DISTILLATION |
US11014039B2 (en) | 2018-07-06 | 2021-05-25 | Praxair Technology, Inc. | Nitrogen service supply system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0175791B1 (en) * | 1984-03-29 | 1988-11-09 | Daidousanso Co., Ltd. | Apparatus for producing high-purity nitrogen gas |
FR2652887B1 (en) * | 1989-10-09 | 1993-12-24 | Air Liquide | PROCESS AND PLANT FOR THE PRODUCTION OF VARIABLE FLOW GAS OXYGEN BY AIR DISTILLATION. |
-
1993
- 1993-01-22 GB GB9301240A patent/GB2274407B/en not_active Expired - Fee Related
- 1993-12-10 CA CA002111140A patent/CA2111140A1/en not_active Abandoned
- 1993-12-13 ZA ZA939332A patent/ZA939332B/en unknown
- 1993-12-24 AU AU52744/93A patent/AU657645B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
AU657645B2 (en) | 1995-03-16 |
ZA939332B (en) | 1995-01-24 |
AU5274493A (en) | 1994-08-25 |
GB2274407A (en) | 1994-07-27 |
GB2274407B (en) | 1996-06-12 |
GB9301240D0 (en) | 1993-03-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3313091A (en) | Vacuum cycle adsorption | |
CN105008272B (en) | Argon production method and device | |
JP2000354631A (en) | Medical device for oxygen therapy | |
CA2128565A1 (en) | Cryogenic Rectification Process and Apparatus for Vaporizing a Pumped Liquid Oxygen Product | |
CN106288653A (en) | A kind of single column cryogenic rectification reclaims device and the method for purification recovery argon of argon | |
WO1987001184A1 (en) | Oxygen gas production unit | |
WO1986000693A1 (en) | Apparatus for producing high-frequency nitrogen gas | |
US20060272352A1 (en) | Air separator | |
KR100902911B1 (en) | Apparatus for Enriching and Purifying Waste Helium Gases | |
CN106839652B (en) | It health care gas integrated form preparation method and its produces and feedway | |
CN107062802A (en) | A kind of kiln oxygen-enriched device for making of low pressure and method | |
CA2102570A1 (en) | Process to recover liquid methane | |
CN109506419A (en) | For producing the method and system of liquid argon and/or argon gas product | |
US3057167A (en) | Process and apparatus for separating helium from helium-air mixtures | |
CN206695507U (en) | Health care gas integrated form is produced and feedway | |
CA2111140A1 (en) | The separation of gas mixtures | |
CN101595356B (en) | Method and device for separating a gas mixture by cryogenic distillation | |
JP7451532B2 (en) | Apparatus and method for separating air by cryogenic distillation | |
GB2171927A (en) | Method and apparatus for separating a gaseous mixture | |
CN1228128C (en) | Variable pressure adsorptive oxygen making device suitable for high altitude area | |
CN206771875U (en) | A kind of oxygen-enriched device for making of kiln low pressure | |
CN206352930U (en) | Flash the re-liquefied system of natural gas denitrogenation | |
US1961201A (en) | Process for separating mixed gases by liquefaction | |
JPS60231402A (en) | Production of oxygen with ca-na-a and na-x-alo3 in n2 adsorption tower | |
JPH06281322A (en) | Manufacturing apparatus for high purity nitrogen and oxygen gas |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
FZDE | Dead |