EP0833120B1 - Process for supplying oxygen to a consumption unit - Google Patents

Process for supplying oxygen to a consumption unit Download PDF

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Publication number
EP0833120B1
EP0833120B1 EP97402214A EP97402214A EP0833120B1 EP 0833120 B1 EP0833120 B1 EP 0833120B1 EP 97402214 A EP97402214 A EP 97402214A EP 97402214 A EP97402214 A EP 97402214A EP 0833120 B1 EP0833120 B1 EP 0833120B1
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EP
European Patent Office
Prior art keywords
gas
oxygen
unit
compressed
air
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.)
Expired - Lifetime
Application number
EP97402214A
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German (de)
French (fr)
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EP0833120A1 (en
Inventor
Didier Magnet
Emmanuel Garnier
Bernard Saulnier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Publication of EP0833120A1 publication Critical patent/EP0833120A1/en
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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
    • F25J3/04951—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network
    • F25J3/04957—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network and inter-connecting equipments upstream of the fractionation unit (s), i.e. at the "front-end"
    • 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
    • F25J3/04024—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 purified feed air, so-called boosted 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
    • F25J3/04078—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04309—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of 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
    • 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
    • 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
    • F25J3/04406—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 a dual pressure main column system
    • F25J3/04412—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 a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • 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
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
    • 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
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
    • F25J3/04551—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the metal production
    • 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
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
    • F25J3/04551—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the metal production
    • F25J3/04557—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the metal production for pig iron or steel making, e.g. blast furnace, Corex
    • 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
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04593—The air gas consuming unit is also fed by an air stream
    • F25J3/046—Completely integrated air feed compression, i.e. common MAC
    • 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
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04593—The air gas consuming unit is also fed by an air stream
    • F25J3/04606—Partially integrated air feed compression, i.e. independent MAC for the air fractionation unit plus additional air feed from the air gas consuming unit
    • 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
    • F25J2230/24—Multiple compressors or compressor stages in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/40—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being air
    • 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
    • F25J2245/50—Processes or apparatus involving steps for recycling of process streams the recycled stream being oxygen

Definitions

  • the present invention relates to a method and a installation for supplying a consuming unit of a gas, and in particular, of an air gas produced by an air separation device by distillation cryogenic.
  • the classic method for feeding a blast furnace is shown in figure 1. Air is sent to a compressor 3 and then to a separation unit cryogenic 5. The oxygen produced is compressed in a compressor 7 and mixed with an air flow coming from a blower 1 before being sent to the HF blast furnace.
  • JP139609 / 1986 describes ( Figure 2) a system in which an air separation device 5 is supplied by the oxygen-enriched air from blower 1 of a HF blast furnace. The oxygen 4 produced by the separation at low pressure is sent to the suction of the blower.
  • the system only allows the recovery of gas produced by the device at a single press.
  • part of the oxygen gas produced is recycled in the air separation unit, so turns in a circle which means that equipment must be enlarged and more increases energy consumption.
  • the object of the invention is to overcome the shortcomings of known processes and installations.
  • an installation for supplying a consuming unit gaseous oxygen comprising:
  • a compression unit a consuming unit oxygen gas, a unit for separating the gas mixture including air means for sending a gas mixture to the compression unit, means for sending a first part of the compressed mixture per unit consumer of gaseous oxygen, means to send a second part of the mixture compressed to the unit of separation, means for sending a first debit oxygen gas at higher pressure per unit consuming gaseous oxygen and, means for sending a second flow of gaseous oxygen at lower pressure at least one compression unit which also compresses an air flow and then at least a unit consuming gaseous oxygen.
  • FIG. 3 to 8 illustrate realizations different from the invention.
  • 200,000 Nm 3 / h of air is sent to the blower 21.
  • the HF blast furnace must be supplied with air enriched with 25% oxygen, which represents a need for 350 T / J of pure oxygen.
  • the flow of gas 22 compressed by the blower 21 is divided into two, the first part 28 being sent to the HF blast furnace and the second part 23, i.e. a flow of 50,000 Nm 3 / h being sent to a distillation apparatus 25 having two columns thermally connected in a conventional manner.
  • This device produces 120 T / J of low pressure oxygen and 230 T / J of medium pressure oxygen.
  • Medium oxygen pressure is met at flow 28 and oxygen at low pressure is compressed in the blower 21.
  • blower 21A compresses 98,300 Nm 3 / h of oxygen-enriched air and the blower 21 compresses 145,000 Nm 3 / h of air of which 50,000 Nm 3 / h are sent to the device 25 (flow 23).
  • the device produces 3300 Nm 3 / h of low pressure oxygen, which are recycled to the blower 21A to be compressed there and 6700 Nm 3 / h of medium pressure oxygen (flow rate 24).
  • the combined flows 28 and 24 constitute 200,000 Nm 3 / h of oxygen-enriched air necessary for the blast furnace.
  • the compressed gas flow 22 is divided into two, the first part 28 being sent to an HF blast furnace and the second part 23 being sent to a unit of two column distillation.
  • the distillation unit produces medium pressure oxygen 24 which is brought together at flow 28 and low pressure oxygen 26 which is compressed in the blower 21.
  • medium pressure oxygen 24 which is brought together at flow 28 and low pressure oxygen 26 which is compressed in the blower 21.
  • two blowers 21, 21A feed the blast furnace.
  • low oxygen pressure 26 is recycled to the blower 21A and only the blower 21 sends air to the separation unit 25.
  • oxygen at low pressure is separated into two flow rates 36, 37 each of which is compressed by a respective blower 38, 39 and sent to an HF2, HF3 blast furnace. Air flows are also sent to compressors 38, 39.
  • the separation unit 25 can also be supplied by an air flow from a compressor 51 (see figure 6).
  • Medium pressure oxygen can be produced by the vaporization of a liquid flow, possibly in a mixing column (direct heat exchange) or against part of the device's supply air in a exchanger (indirect heat exchange).
  • the invention also applies to other units consuming oxygen-enriched air, for example in glass furnaces and metallurgy units of copper.
  • gases such as nitrogen
  • produced by the separation device can also be sent to the compressed gas consuming unit of the invention.
  • air 71 compressed to pressure of the medium pressure column is divided into three parts.
  • the first part 71A is sent directly to the medium pressure column.
  • the second part 71B is compressed in a compressor 75, liquefied in the line 73 and sent to the medium pressure column after relaxation.
  • the third part 71C is relaxed in an insufflation turbine 77 is sent to the column low pressure. Liquid oxygen is drawn from the low pressure column, pumped and vaporized in the line exchange 73.

Description

La présente invention concerne un procédé et une installation pour l'alimentation d'une unité consommatrice d'un gaz, et en particulier, d'un gaz de l'air produit par un appareil de séparation de l'air par distillation cryogénique.The present invention relates to a method and a installation for supplying a consuming unit of a gas, and in particular, of an air gas produced by an air separation device by distillation cryogenic.

La méthode classique pour alimenter un haut-fourneau est montrée en figure 1. De l'air est envoyé à un compresseur 3 et ensuite à une unité de séparation cryogénique 5. L'oxygène produit est comprimé dans un compresseur 7 et mélangé à un débit d'air provenant d'une soufflante 1 avant d'être envoyé au haut-fourneau HF.The classic method for feeding a blast furnace is shown in figure 1. Air is sent to a compressor 3 and then to a separation unit cryogenic 5. The oxygen produced is compressed in a compressor 7 and mixed with an air flow coming from a blower 1 before being sent to the HF blast furnace.

Un procédé analogue est aussi décrit dans le document DE-A-42 19 160.A similar process is also described in document DE-A-42 19 160.

JP139609/1986 décrit (figure 2) un système dans lequel un appareil de séparation d'air 5 est alimenté par de l'air enrichi en oxygène provenant de la soufflante 1 d'un haut fourneau HF. L'oxygène 4 produit par l'appareil de séparation à basse pression est envoyé à l'aspiration de la soufflante.JP139609 / 1986 describes (Figure 2) a system in which an air separation device 5 is supplied by the oxygen-enriched air from blower 1 of a HF blast furnace. The oxygen 4 produced by the separation at low pressure is sent to the suction of the blower.

Le système permet uniquement de valoriser le gaz produit par l'appareil à une seule pression.The system only allows the recovery of gas produced by the device at a single press.

De plus, une partie de l'oxygène gazeux produit est recyclée dans l'appareil de séparation d'air, donc tourne en rond ce qui oblige à grossir les équipements et de plus augmente la consommation d'énergie.In addition, part of the oxygen gas produced is recycled in the air separation unit, so turns in a circle which means that equipment must be enlarged and more increases energy consumption.

Le but de l'invention est de pallier aux défauts des procédés et des installations connus.The object of the invention is to overcome the shortcomings of known processes and installations.

Selon la présente invention, il est prévu un procédé pour l'alimentation d'une unité consommatrice d'oxygène gazeux dans lequel :

  • i) on comprime un débit d'alimentation constitué par un mélange de gaz comprenant de l'air dans une unité de compression ;
  • ii) on envoie une première partie du mélange comprimé à l'unité ;
  • iii) on envoie une deuxième partie du mélange comprimé à un appareil de séparation d'air qui sépare le mélange pour produire deux débits d'oxygène gazeux dont l'un est à une pression plus élevée que l'autre ;
  • iv) on envoie le débit d'oxygène gazeux à une pression plus élevée à l'unité consommatrice d'oxygène gazeux, éventuellement en la mélangeant à la première partie du mélange comprimé ;
  • v) on envoie l'autre débit d'oxygène gazeux à au moins une unité de compression qui comprime également un débit d'air et on envoie le gaz ainsi comprimé à au moins une unité consommatrice du gaz.
    • According to the present invention, a method is provided for feeding a unit consuming gaseous oxygen in which:
  • i) a feed flow rate consisting of a gas mixture comprising air is compressed in a compression unit;
  • ii) a first part of the compressed mixture is sent to the unit;
  • iii) a second part of the compressed mixture is sent to an air separation device which separates the mixture to produce two flows of oxygen gas, one of which is at a higher pressure than the other;
  • iv) the flow of oxygen gas at a higher pressure is sent to the unit consuming oxygen gas, possibly by mixing it with the first part of the compressed mixture;
  • v) the other flow of gaseous oxygen is sent to at least one compression unit which also compresses an air flow and the gas thus compressed is sent to at least one unit consuming the gas.

    • Selon des modes particuliers de réalisation de l'invention, il est prévu :

    • un procédé dans lequel le débit d'alimentation est de l'air;
    • un procédé dans lequel les deux débits de gaz sont envoyés à la même unité consommatrice du gaz ;
    • un autre procédé selon l'une quelconque des revendications précédentes selon lequel l'installation consommatrice d'un gaz est un haut-fourneau qui consomme de l'air enrichi en oxygène.
    According to particular embodiments of the invention, provision is made:
    • a method in which the feed rate is air;
    • a method in which the two gas flows are sent to the same gas consuming unit;
    • another process according to any one of the preceding claims, in which the installation consuming a gas is a blast furnace which consumes oxygen-enriched air.

    Selon la présente invention, il est également prévu une installation pour l'alimentation d'une unité consommatrice d'oxygène gazeux comprenant :According to the present invention, there is also provided an installation for supplying a consuming unit gaseous oxygen comprising:

    une unité de compression, une unité consommatrice d'oxygène gazeux, une unité de séparation du mélange gazeux comprenant de l'air des moyens pour envoyer un mélange gazeux à l'unité de compression, des moyens pour envoyer une première partie du mélange comprimé à l'unité consommatrice d'oxygène gazeux, des moyens pour envoyer une deuxième partie du mélange comprimé à l'unité de séparation, des moyens pour envoyer un premier débit d'oxygène gazeux à pression plus élevée à l'unité consommatrice d'oxygène gazeux et, des moyens pour envoyer un deuxième débit d'oxygène gazeux à pression moins élevée à au moins une unité de compression qui comprime également un débit d'air et ensuite à au moins une unité consommatrice d'oxygène gazeux.a compression unit, a consuming unit oxygen gas, a unit for separating the gas mixture including air means for sending a gas mixture to the compression unit, means for sending a first part of the compressed mixture per unit consumer of gaseous oxygen, means to send a second part of the mixture compressed to the unit of separation, means for sending a first debit oxygen gas at higher pressure per unit consuming gaseous oxygen and, means for sending a second flow of gaseous oxygen at lower pressure at least one compression unit which also compresses an air flow and then at least a unit consuming gaseous oxygen.

    L'invention pourrait s'appliquer à d'autres applications que celles décrites ici.The invention could be applied to others applications than those described here.

    Les figures 3 à 8 illustrent des réalisations différentes de l'invention.Figures 3 to 8 illustrate realizations different from the invention.

    Dans la figure 3, 200 000 Nm3/h d'air est envoyé à la soufflante 21. Le haut-fourneau HF doit être alimenté par de l'air enrichi à 25 % en oxygène, ce qui représente un besoin de 350 T/J d'oxygène pur. Le débit de gaz 22 comprimé par la soufflante 21 est divisé en deux, la première partie 28 étant envoyée au haut-fourneau HF et la deuxième partie 23, soit un débit de 50 000 Nm3/h étant envoyée à un appareil de distillation 25 ayant deux colonnes reliées thermiquement de manière classique.In FIG. 3, 200,000 Nm 3 / h of air is sent to the blower 21. The HF blast furnace must be supplied with air enriched with 25% oxygen, which represents a need for 350 T / J of pure oxygen. The flow of gas 22 compressed by the blower 21 is divided into two, the first part 28 being sent to the HF blast furnace and the second part 23, i.e. a flow of 50,000 Nm 3 / h being sent to a distillation apparatus 25 having two columns thermally connected in a conventional manner.

    Cet appareil produit 120 T/J d'oxygène basse pression et 230 T/J d'oxygène moyenne pression. L'oxygène à moyenne pression est réuni au débit 28 et l'oxygène à basse pression est comprimé dans la soufflante 21.This device produces 120 T / J of low pressure oxygen and 230 T / J of medium pressure oxygen. Medium oxygen pressure is met at flow 28 and oxygen at low pressure is compressed in the blower 21.

    Dans la variante de la figure 4, on alimente le haut fourneau de la figure 3 utilisant le même appareil de séparation d'air mais on utilise deux soufflantes 21, 21A, dont une 21 sert à alimenter l'unité de séparation 25 et l'unité consommatrice et l'autre 21A sert à comprimer l'air enrichi en oxygène basse pression.In the variant of Figure 4, we feed the top furnace of figure 3 using the same apparatus of air separation but two blowers 21, 21A are used, one of which 21 is used to supply the separation unit 25 and the consuming unit and the other 21A is used to compress air enriched with low pressure oxygen.

    De cette façon, on peut comprimer l'air avec des soufflantes pouvant être de tailles différentes ; seule une de ces soufflantes aura besoin de mesures de sécurité pour éviter des problèmes dus à la concentration en oxygène. Donc la soufflante 21A comprime 98,300 Nm3/h d'air enrichi en oxygène et la soufflante 21 comprime 145,000 Nm3/h d'air dont 50 000 Nm3/h sont envoyés à l'appareil 25 (débit 23). L'appareil produit 3300 Nm3/h d'oxygène basse pression, qui sont recyclés à la soufflante 21A pour y être comprimés et 6700 Nm3/h d'oxygène moyenne pression (débit 24). Les débits 28 et 24 réunis constituent les 200 000 Nm3/h d'air enrichi en oxygène nécessaire au haut fourneau.In this way, the air can be compressed with blowers which may be of different sizes; only one of these blowers will need safety measures to avoid problems due to oxygen concentration. So the blower 21A compresses 98,300 Nm 3 / h of oxygen-enriched air and the blower 21 compresses 145,000 Nm 3 / h of air of which 50,000 Nm 3 / h are sent to the device 25 (flow 23). The device produces 3300 Nm 3 / h of low pressure oxygen, which are recycled to the blower 21A to be compressed there and 6700 Nm 3 / h of medium pressure oxygen (flow rate 24). The combined flows 28 and 24 constitute 200,000 Nm 3 / h of oxygen-enriched air necessary for the blast furnace.

    Le débit de gaz comprimé 22 est divisé en deux, la première partie 28 étant envoyée à un haut-fourneau HF et la deuxième partie 23 étant envoyée à une unité de distillation 25 à deux colonnes. L'unité de distillation produit de l'oxygène à moyenne pression 24 qui est réuni au débit 28 et l'oxygène à basse pression 26 qui est comprimé dans la soufflante 21. Ainsi l'air enrichi avec 23 % d'oxygène est envoyé au haut-fourneau.The compressed gas flow 22 is divided into two, the first part 28 being sent to an HF blast furnace and the second part 23 being sent to a unit of two column distillation. The distillation unit produces medium pressure oxygen 24 which is brought together at flow 28 and low pressure oxygen 26 which is compressed in the blower 21. Thus the air enriched with 23% of oxygen is sent to the blast furnace.

    Dans la variante de la figure 4, deux soufflantes 21, 21A alimentent le haut-fourneau. l'oxygène à basse pression 26 est recyclé à la soufflante 21A et seule la soufflante 21 envoie de l'air à l'unité de séparation 25.In the variant of FIG. 4, two blowers 21, 21A feed the blast furnace. low oxygen pressure 26 is recycled to the blower 21A and only the blower 21 sends air to the separation unit 25.

    Dans la variante de la figure 5, l'oxygène à basse pression est séparé en deux débits 36, 37 dont chacun est comprimé par une soufflante respective 38, 39 et envoyé à un haut-fourneau HF2, HF3. Des débits d'air sont également envoyés aux compresseurs 38, 39.In the variant of Figure 5, oxygen at low pressure is separated into two flow rates 36, 37 each of which is compressed by a respective blower 38, 39 and sent to an HF2, HF3 blast furnace. Air flows are also sent to compressors 38, 39.

    L'unité de séparation 25 peut aussi être alimentée par un débit d'air provenant d'un compresseur 51 (voir figure 6).The separation unit 25 can also be supplied by an air flow from a compressor 51 (see figure 6).

    L'oxygène à moyenne pression peut être produit par la vaporisation d'un débit liquide, éventuellement dans une colonne de mélange (échange de chaleur direct) ou contre une partie de l'air d'alimentation de l'appareil dans un échangeur (échange de chaleur indirect).Medium pressure oxygen can be produced by the vaporization of a liquid flow, possibly in a mixing column (direct heat exchange) or against part of the device's supply air in a exchanger (indirect heat exchange).

    L'invention s'applique également aux autres unités consommatrices d'air enrichi en oxygène, par exemple dans les fours à verre et des unités de la métallurgie de cuivre.The invention also applies to other units consuming oxygen-enriched air, for example in glass furnaces and metallurgy units of copper.

    Les autres gaz, par exemple l'azote, produits par l'appareil de séparation peuvent également être envoyés à l'unité consommatrice du gaz comprimé de l'invention.Other gases, such as nitrogen, produced by the separation device can also be sent to the compressed gas consuming unit of the invention.

    Dans la figure 7, de l'air 71 comprimé à la pression de la colonne moyenne pression est divisé en trois parties. La première partie 71A est envoyée directement à la colonne moyenne pression. La deuxième partie 71B est comprimée dans un compresseur 75, liquéfiée dans la ligne d'échange 73 et envoyée à la colonne moyenne pression après détente. La troisième partie 71C est détendue dans une turbine d'insufflation 77 est envoyée à la colonne basse pression. De l'oxygène liquide est soutiré de la colonne basse pression, pompé et vaporisé dans la ligne d'échange 73.In Figure 7, air 71 compressed to pressure of the medium pressure column is divided into three parts. The first part 71A is sent directly to the medium pressure column. The second part 71B is compressed in a compressor 75, liquefied in the line 73 and sent to the medium pressure column after relaxation. The third part 71C is relaxed in an insufflation turbine 77 is sent to the column low pressure. Liquid oxygen is drawn from the low pressure column, pumped and vaporized in the line exchange 73.

    Dans la figure 8, on retrouve les mêmes éléments que dans la figure 7 sauf que la turbine d'insufflation d'air 77 est remplacée par une turbine d'azote moyenne pression 87. L'air comprimé 71B est liquéfié et divisé en deux parties, dont une est envoyée à la colonne moyenne pression et l'autre à la colonne basse pression.In Figure 8, we find the same elements as in figure 7 except that the air blowing turbine 77 is replaced by a medium pressure nitrogen turbine 87. The compressed air 71B is liquefied and divided into two parts, one of which is sent to the middle column pressure and the other to the low pressure column.

    Claims (13)

    1. Process for feeding an oxygen-gas-consuming unit (HF), in which:
      i) a feed stream consisting of a gas mixture comprising air is compressed in a compression unit (21);
      ii) a first portion (28) of the compressed mixture is sent to the unit (HF);
      iii) a second portion (23) of the compressed mixture is sent to a separation apparatus (25) which separates the mixture in order to produce two oxygen gas streams, one of which is at a higher pressure than the other;
      iv) the oxygen gas stream (24) at higher pressure is sent to the gas-consuming unit (HF), optionally mixing it with the first portion (28) of the compressed mixture;
      (v) the other oxygen gas stream (26) is sent to at least one compression unit (21, 21A, 38, 39), which also compresses an air stream, and the gas thus compressed is sent to at least one oxygen-gas-consuming unit (HF, HF2, HF3).
    2. Process according to Claim 1, in which the feed stream is air.
    3. Process according to one of the preceding claims, in which the two oxygen gas streams are sent to the same gas-consuming unit (HF).
    4. Process according to one of the preceding claims, in which the other oxygen gas stream and the, or one of the, feed streams are compressed in the same compression unit (21).
    5. Process according to one of the preceding claims, in which an oxygen gas-consuming unit (HF) is fed with at least two feed streams compressed separately by compression units consisting of respective blowers (21, 21A).
    6. Process according to Claim 5, in which a first blower (21A) is fed by the other oxygen gas stream (26) and by air, and a portion (23) of the feed stream compressed in a second blower (21) is sent to the separation unit (25).
    7. Process according to one of the preceding claims, in which the separation unit (25) is also fed with air delivered by an air compressor (51).
    8. Process according to one of the preceding claims, in which the oxygen at higher pressure is produced by the unit (25) by vaporization of a liquid in direct or indirect heat exchange, possibly with a compressed air stream (71B).
    9. Process according to any one of the preceding claims, in which the oxygen gas at higher pressure is compressed for this pressure.
    10. Process according to one of Claims 8 or 9, in which the air (71B) or the oxygen gas at higher pressure is compressed by a compressor (75) driven by an expansion turbine (77, 87)of the separation unit (25).
    11. Process according to one of the preceding claims, in which the separation unit (25) is a cryogenic distillation unit.
    12. Process according to any one of the preceding claims, according to which the gas-consuming plant (HF) is a blast furnace which consumes oxygen-enriched air.
    13. Installation for feeding an oxygen-gas-consuming unit (HF), comprising:
         a compression unit (21), an oxygen-gas-consuming unit, a unit (25) for separating a gas mixture comprising air, means for sending the gas mixture to the compression unit, means (22, 28) for sending a first portion of the compressed mixture to the oxygen-gas-consuming unit, means (23) for sending a second portion of the compressed mixture to the separation unit (25), means (24) for sending a first oxygen gas stream, at higher pressure, to the oxygen-gas-consuming unit (HF, HF1), means (36, 38) for sending a second oxygen gas stream at lower pressure, to at least one compression unit (21, 21A, 38, 39) which also compresses an air stream and subsequently to at least one oxygen-gas-consuming unit (HF, HF2, HF3).
    EP97402214A 1996-09-25 1997-09-24 Process for supplying oxygen to a consumption unit Expired - Lifetime EP0833120B1 (en)

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    FR9611680 1996-09-25
    FR9611680A FR2753638B1 (en) 1996-09-25 1996-09-25 PROCESS FOR SUPPLYING A GAS CONSUMER UNIT

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    FR2825119B1 (en) * 2001-05-23 2003-07-25 Air Liquide METHOD AND INSTALLATION FOR SUPPLYING AN AIR SEPARATION UNIT USING A GAS TURBINE
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    FR2862004B3 (en) * 2003-11-10 2005-12-23 Air Liquide METHOD AND INSTALLATION FOR ENRICHING A GASEOUS FLOW IN ONE OF ITS CONSTITUENTS
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    US6062043A (en) 2000-05-16
    ES2169335T3 (en) 2002-07-01
    KR100501056B1 (en) 2005-09-26
    CN1186862A (en) 1998-07-08
    ZA978559B (en) 1998-03-23
    DE69709282D1 (en) 2002-01-31
    JPH10180082A (en) 1998-07-07
    KR19980024948A (en) 1998-07-06
    FR2753638B1 (en) 1998-10-30
    EP0833120A1 (en) 1998-04-01
    FR2753638A1 (en) 1998-03-27

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