Classifications

• • 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
  • F25J3/04781—Pressure changing devices, e.g. for compression, expansion, liquid pumping
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B5/00—Making pig-iron in the blast furnace
• • 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
  • F25J3/04315—Lowest pressure or impure nitrogen, so-called waste nitrogen expansion
• • 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
• • 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
  • F25J3/04763—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
  • F25J3/04969—Retrofitting or revamping of an existing air fractionation 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
  • F25J2200/00—Processes or apparatus using separation by rectification
  • F25J2200/20—Processes or apparatus using separation by rectification in an elevated pressure multiple column system wherein the lowest pressure column is at a pressure well above the minimum pressure needed to overcome pressure drop to reject the products to atmosphere
• • 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

Definitions

• the present invention relates to a method for renovating a combined installation of a blast furnace fed with oxidizing fluid. derived at least partially from an air separation unit (ASU).
• ASU air separation unit
• Combined facilities of a blast furnace and an air distillation apparatus comprising such a mixing column are described for example in US-A-5 244 489 (Grenier) and EP-A-0 531 182 in the name of the plaintiff.
• the approaches followed in these two documents, however, are opposite: in document US Pat. No.
• the distillation apparatus is entirely supplied with air by a wind diversion of a blast furnace blower and the part of the flow of air supplied to the mixing column is slightly overpressed by a booster driven by a cold holding turbine that relaxes the part of the air flow sent to the medium-pressure column, in an imposing arrangement, to perform said overpressure, to turbinate a large part of the supply air of the medium-pressure column causing losses in extraction efficiency and energy as well as oversizing of refrigeration stations and cleaning of the supply air of the apparatus distillation.
• EP-A-0 531 182 provides for complete separation of the air supplies a) from the top-mold b) of the medium pressure column and c) from the mixing column using means of separate compression in particular to allow the production, in the mixing column, impure oxygen at high or low pressures, in an expensive arrangement for investment and operation of rotating machinery and not considering any synergy between these last.
• EP-A-0 932 006 is intended to propose a combined installation and a method of implementing such a combined installation with extremely high integration and allowing significantly reduced operating costs while offering flexibility in the selection of operating ranges.
• the proposed method is of the type comprising at least one furnace supplied with air by at least one blower supplying air at a first pressure Pi and oxygen by at least one air distillation apparatus comprising at least one medium pressure column supplied with air at least partially by the furnace blower, ot a mixing column supplying oxygen to the furnace, and wherein the mixing column is supplied with air by an air compressor at a pressure P 2 greater than Pi.
• the medium pressure column is fed solely by compressed air supplied by the furnace blower.
• the proposed solution consists in controlling this blower in flow rate and / or in pressure by a regulator whose measurement and the reference come from the ASU (typically purification (air flow input or output), or pre-cooling (air flow between the blower outlet and the purification inlet), or the suction of a second machine (suction pressure of an additional compressor)).
• ASU typically purification (air flow input or output), or pre-cooling (air flow between the blower outlet and the purification inlet), or the suction of a second machine (suction pressure of an additional compressor)).
• the method according to the invention is characterized in that more than 50% of the flow of the blower which feeds the blast furnace before revamping is injected into a cryogenic unit for separating the gases from the air in order to produce oxygen from purity greater than 90% O 2 vol which feeds the blast furnace, the air flow of the souf ⁇ nîe and / or Is air pressure from the blower being controlled by a regulator which measures the flow rate and / or the pressure at the inlet and / or the outlet of the air cleaning stage, placed upstream of the separation unit, so as to control the flow rate or the pressure air from the blower, the feed fluid of the blast furnace being constituted by pure oxygen or diluted with air produced by the cryogenic separation unit.
• the air is supplied in part or in full by at least one blast furnace blower, the air flow thus supplied representing more than 50% of the compressed air flow rate by said at least one blower, At least one blower will preferably be controlled in flow rate and / or pressure by a regulator whose measurement and the reference come from the ASU
• the air is supplied in part or in full by at least one blast furnace blower, the air flow thus supplied representing more than 50% of the compressed air flow rate by the ) blower, while at least one blower is controlled in flow by a regulator whose setpoint is calculated from the flow of one of the products from the ASU (oxygen, nitrogen and / or argon in liquid or gaseous form) .
• ASU oxygen, nitrogen and / or argon in liquid or gaseous form
• the compressed air from the blower will be cooled to a temperature of less than or equal to 50 ° C., then optionally recompressed in a second compressor or blower, before being sent to the purification upstream of the blower.
• KNEW the flow rate of the fan is controlled by a regulator FIC whose measurement and the reference come from the ASU (typically the purification (air flow input or output), or the pre cooling (air flow between the blower outlet and the purification inlet), while the additional compressor will not comprise specific flow control.
• the fan is controlled by a PIC regulator whose measurement and setpoint are exerted on the fluid (air) at the suction of the recompressor), while the additional compressor is regulated by a regulator
• the ASU typically purification (inlet or outlet air flow), or pre-cooling (air flow between blower outlet and purge inlet)).
• the ASU will also be able to produce (in gaseous or liquid form) oxygen and / or nitrogen and / or argon and / or air "instrument" for other than Ee top -furnace.
• the method according to the invention is characterized in that the blower is controlled by a PIC regulator whose flow rate or pressure measurement and whose setpoint value is determined from the input fluid of the second compressor.
• FIG. 1 an illustration of the invention
• FIG. 2 a variant of Figure 1
• FIG. 3 a variant of the invention with a second compressor or fan.
• the compressed air coming from the fan 1 is sent through the pipe 2 into a cooling means 3 and then via the line 5 to the "header" purification connected by the pipe 6 to the ASU 9 which delivers oxygen through the pipe 10 to the blast furnace 11, point 12.
• a FIC controller 7 controls the blower 1 via the electrical connections 8 and 13, according to the method described above.
• Fig. 2 which is a variant of Fig. 1, the same elements bear the same references.
• the measurement of the control parameters is done here at the level of the flow of oxygen at the blast furnace inlet, via the oxygen flow rate controller 14, connected to an apparatus 15 which calculates the FY setpoint value of the FIC 17 which controls via 18 and 13 the flow rate and / or the pressure of the air delivered by the blower 1 to the purification 5.
• FIG. 3 is shown a variant of the preceding figures with injection of the air cooled in 3 in the recompressor 19 which feeds the purification 5.
• the FIC controller 21 on the line 6, measures the flow rate and / or the air pressure at this particular point (as in FIG. 1) and retransmits the information via 23 and 24 at the recompressor 19.
• Another PIC controller 25 measures the flow rate and / or the air pressure at the outlet of the cooling means 3 and controls via 26 and 13 the fan 1 as described above.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Separation By Low-Temperature Treatments (AREA)
• Combustion Of Fluid Fuel (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (7)

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Family Cites Families (14)

• 2004
  • 2004-02-27 FR FR0450371A patent/FR2866900B1/fr not_active Expired - Fee Related
• 2005
  • 2005-02-11 EP EP05728076A patent/EP1721016B1/de not_active Expired - Lifetime
  • 2005-02-11 CA CA2557287A patent/CA2557287C/fr not_active Expired - Lifetime
  • 2005-02-11 AU AU2005218215A patent/AU2005218215B2/en not_active Ceased
  • 2005-02-11 US US10/589,936 patent/US7645319B2/en not_active Expired - Lifetime
  • 2005-02-11 PL PL05728076T patent/PL1721016T3/pl unknown
  • 2005-02-11 WO PCT/FR2005/050089 patent/WO2005085727A2/fr not_active Ceased

Non-Patent Citations (1)

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