EP1690054A1 - Procede et installation de fourniture d'oxygène à haute purete par distillation cryognique d'air - Google Patents
Procede et installation de fourniture d'oxygène à haute purete par distillation cryognique d'airInfo
- Publication number
- EP1690054A1 EP1690054A1 EP04805825A EP04805825A EP1690054A1 EP 1690054 A1 EP1690054 A1 EP 1690054A1 EP 04805825 A EP04805825 A EP 04805825A EP 04805825 A EP04805825 A EP 04805825A EP 1690054 A1 EP1690054 A1 EP 1690054A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxygen
- column
- air
- pressure column
- flow
- 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.)
- Withdrawn
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04284—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
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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
- F25J3/04406—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
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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
- F25J3/0446—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using the heat generated by mixing two different phases
- F25J3/04466—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using the heat generated by mixing two different phases for producing oxygen as a mixing column overhead gas by mixing gaseous air feed and liquid oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—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
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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
- F25J3/04521—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
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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
- F25J3/04521—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
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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
- F25J3/04521—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
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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
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04812—Different modes, i.e. "runs" of operation
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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
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04812—Different modes, i.e. "runs" of operation
- F25J3/04824—Stopping of the process, e.g. defrosting or deriming; Back-up procedures
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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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/04—Processes or apparatus using separation by rectification in a dual pressure main column system
- F25J2200/06—Processes or apparatus using separation by rectification in a dual pressure main column system in a classical double column flow-sheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
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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
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/02—Mixing or blending of fluids to yield a certain product
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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
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/50—Oxygen or special cases, e.g. isotope-mixtures or low purity O2
- F25J2215/52—Oxygen production with multiple purity O2
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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
- F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J2235/50—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being oxygen
Definitions
- the present invention relates to the air distillation technique, and in particular to a process and installation for supplying high purity oxygen by cryogenic distillation of air.
- Certain industrial applications require large quantities of impure oxygen under various pressures: gasification of coal, gasification of petroleum residues, direct reduction-melting of iron ore, injection of coal into blast furnaces, metallurgy of non-ferrous metals, etc.
- certain industrial contexts require the simultaneous supply, in large quantities, of practically pure oxygen and of impure oxygen under different pressures.
- a steel production unit conventionally comprises several devices with different oxygen needs, as described in "The Making, Shaping and Treating of Steel", AISE, 1985.
- the blast furnace consumes oxygen-enriched air, generally produced by mixing compressed air with low purity oxygen.
- Low purity oxygen has a purity of between 80 and 97%.
- converters and arc furnaces consume oxygen with a high purity of between 99 and 99.8%.
- two apparatuses for producing oxygen by air distillation are often provided, the one which produces low purity oxygen being a mixing column apparatus of the type described in US-A-4022030 and EP-A-0531182 and that which produces high purity oxygen being a conventional double column apparatus. All the purities mentioned are molar percentages.
- the object of the invention is to provide an installation comprising two air separation apparatuses, one of which, with a mixing column, which produces low purity oxygen and a second which produces oxygen high purity, the installation being able to produce high purity oxygen even when the second device is not operating, so that the storage of high pressure oxygen can be eliminated or reduced in size.
- a method for supplying high purity oxygen by cryogenic distillation of air from an installation comprising first and second air separation devices, the first air separation comprising a medium pressure column, a low pressure column thermally connected with the medium pressure column and a mixing column in which i) distilled air is sent to the medium pressure column ii) enriched liquids are sent in oxygen and nitrogen from the medium pressure column to the low pressure column iii) according to a first step of the apparatus, a flow of oxygen-enriched liquid coming from the low pressure column is sent to the head of the mixing column iv) according to the first step, a low purity oxygen flow rate is withdrawn at the head of the mixing column and at least part of it is sent to a first consuming unit v) according to the first 1st step, air is sent to the mixing column vi) according to the first step, the second device supplies high purity oxygen to a second consuming unit characterized in that vii) according to a second step, in the first device, the flow rate of oxygen-enriched
- the second device does not supply high purity oxygen to the second consuming unit or provides part of the high purity oxygen required by the second consuming unit.
- the first consuming unit is a blast furnace and the second consuming unit is a converter or an arc furnace; - during the first operation, the blast furnace is supplied with oxygen-enriched air and during the second operation, the blast furnace is supplied either with air or with air less enriched in oxygen than that with which it is supplied during the first step; - the mixing column does not work during the second step; - the second consuming unit is supplied with oxygen (only) from the second air separation device during the first step and is supplied with oxygen only from the first device during the second step.
- an installation for supplying oxygen by cryogenic distillation of air comprising a first and a second air separation device, the first air separation device comprising a column medium pressure, a low pressure column thermally connected to the medium pressure column and a mixing column comprising: a) means for sending air to be distilled to the medium pressure column b) means for sending liquids enriched with oxygen and in nitrogen from the medium pressure column to the low pressure column c) means for sending at the head of the mixing column a flow of oxygen-enriched liquid coming from the low pressure column d) means for sending air to the tank from the mixing column e) means for withdrawing at the head of the mixing column a flow of low purity oxygen and means for sending at least a portion thereof to a first unit consumer f) means for supplying high purity oxygen from the second air separation unit to the second consuming unit characterized in that it comprises g) means for reducing, if necessary to zero, the flow rate of oxygen-enriched liquid sent to the head of the mixing column h) means for reducing
- the first consuming unit is a blast furnace and the second consuming unit is a converter or an arc furnace;
- the installation comprises means for supplying the blast furnace with low purity oxygen from the first device and means for stopping the sending of low purity oxygen from the first device to the blast furnace;
- the installation comprises means for supplying the blast furnace with oxygen only from the second air separation device and means for supplying the blast furnace with oxygen only from the first device;
- the installation comprises at least one high purity oxygen compressor upstream of the second consuming unit and downstream of the first air separation device.
- the air separation installation of FIG. 1 comprises a first air separation apparatus by cryogenic distillation 1 and a second air separation apparatus by cryogenic distillation 2.
- the first air separation device produces a low purity oxygen flow containing between 80 and 97% oxygen.
- This oxygen 3 is sent downstream of the blower 4 of a first consuming unit, in this case a blast furnace 5 and is mixed with compressed air 7 to be sent to the blast furnace.
- the second device 2 produces high purity oxygen containing between 99 and 99.9% oxygen.
- This oxygen 8 is sent to a second unit consumer 9.
- the second device can be any cryogenic device producing oxygen gas at high pressure, for example a double or triple column in which the oxygen is pressurized either by compression of the oxygen gas or by pumping the liquid oxygen followed by vaporization.
- the second device 2 does not work.
- the first device produces high purity oxygen 11 and sends it to the second unit 9 following compression in the compressor 13.
- the first device either does not produce low pressure oxygen so that the blast furnace is supplied only by air is produced less low pressure oxygen and the mixture with air 7.
- the apparatus essentially comprises a heat exchange line 1A, a double distillation column 2A comprising itself me a medium pressure column 3A, a low pressure column 4A and a main condenser-evaporator 5A, and a mixing column 6A.
- a mixing column is a column which has the same structure as a distillation column but which is used to mix in a manner close to reversibility a relatively volatile gas, introduced at its base, and a less volatile liquid, introduced at its top.
- a relatively volatile gas introduced at its base
- a less volatile liquid introduced at its top.
- Such a mixture produces refrigerating energy and therefore makes it possible to reduce the energy consumption linked to distillation.
- this mixture is used, moreover, to directly produce impure oxygen under the pressure P, as will be described below.
- the air to be separated by distillation, compressed to 6 x 10 5 Pa and suitably purified, is conveyed to the base of the medium pressure column 3A by a pipe 7A. Most of this air is cooled in the exchange line 1A and introduced at the base of the medium pressure column 3A, and the rest, boosted to 8A and then cooled, is expanded at low pressure in a turbine
- Liquid oxygen more or less pure depending on the setting of the double column 2A, is withdrawn from the tank of column 4A, carried by a pump 13A at a pressure P1, slightly higher than the aforementioned pressure P to take account of pressure losses (P1-P less than 1 x 10 5 Pa), and introduced at the top of column 6.
- P1 is therefore advantageously between 8 x 10 5
- auxiliary compressor 14A which can be blower 4
- cooled in the exchange line 1A is introduced at the base of the mixing column 6A.
- FIG. 2 also shows auxiliary heat exchangers 19 A, 20A, 21 A ensuring the recovery of the cold available in the fluids circulating in the installation.
- the pressure P of the impure oxygen produced can be chosen as desired.
- the adjustment of the double column makes it possible to obtain various degrees of purity for this gas.
- the pump 13A is stopped so that the liquid oxygen is no longer drawn off from the tank of the column 4A and introduced at the top of the column 6.
- the auxiliary air is no longer introduced at the base of the mixing column 6A.
- the three fluid streams are no longer drawn from the latter.
- a reduced quantity of liquid oxygen compared to that sent during the first step, is withdrawn from the tank of column 4A, carried by the pump 13A at pressure P1 and introduced at the top of the column. 6A.
- a reduced amount of auxiliary air is introduced to the base of the mixing column 6A and the three fluid streams drawn from the mixing column are also reduced.
- a gas flow 11 of high purity oxygen containing between 99 and 99.8% oxygen is withdrawn from the bottom of the low pressure column according to the second step, this flow being not withdrawn during the first operation or being withdrawn in very small quantities as a purge of the 5A condenser.
- This flow 11 is compressed in the compressor 13 and sent to the second consuming unit 9 which can be a cast iron oxygen converter or an arc furnace. Part of the high purity oxygen can also be sent to flame cutting. If the flow 8 is brought to its final pressure by another compressor, this other compressor can be used to compress the flow 11 when the flow 8 is not supplied and the compressor 13 will not be required. Similarly, if the flow compressor 8 does not work, for example due to a fault, during the first operation, the flow 8 can be compressed in the compressor 13. It is possible to extend the concept of this invention to d other types of devices. For example, it is possible to produce impure oxygen with a first device and pure oxygen with a second device and modify either the operation of the first device or the first device itself to allow the production of pure oxygen with the first device.
- This kind of modification would apply for example to a double column apparatus with an auxiliary column supplied at the head with impure oxygen coming from the tank of the low pressure column, the auxiliary column having a tank reboiler.
- the auxiliary column could be supplied to allow pure oxygen to be drawn off from the auxiliary column tank only during a particular operation of the apparatus. It is obviously possible to exploit the invention with a device with a mixing column different from that of FIG. 2. By supplying the flow rates 8 and 11 at the same time it is possible to have a maximum production of high purity oxygen, preferably by stopping the operation of the mixing column.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Blast Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0350818A FR2862128B1 (fr) | 2003-11-10 | 2003-11-10 | Procede et installation de fourniture d'oxygene a haute purete par distillation cryogenique d'air |
PCT/FR2004/050582 WO2005045340A1 (fr) | 2003-11-10 | 2004-11-10 | Procede et installation de fourniture d'oxygene a haute purete par distillation cryogenique d'air |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1690054A1 true EP1690054A1 (fr) | 2006-08-16 |
Family
ID=34508748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04805825A Withdrawn EP1690054A1 (fr) | 2003-11-10 | 2004-11-10 | Procede et installation de fourniture d'oxygène à haute purete par distillation cryognique d'air |
Country Status (8)
Country | Link |
---|---|
US (1) | US20070221492A1 (fr) |
EP (1) | EP1690054A1 (fr) |
JP (1) | JP2007516405A (fr) |
CN (1) | CN100538234C (fr) |
BR (1) | BRPI0416372A (fr) |
FR (1) | FR2862128B1 (fr) |
RU (1) | RU2354902C2 (fr) |
WO (1) | WO2005045340A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2005225027A1 (en) * | 2005-07-21 | 2007-02-08 | L'air Liquide Societe Anonyme Pour L'etude Et L"Exploitation Des Procedes Georges Claude | Process and apparatus for the separation of air by cryogenic distillation |
FR2895068B1 (fr) * | 2005-12-15 | 2014-01-31 | Air Liquide | Procede de separation d'air par distillation cryogenique |
CN101929789B (zh) * | 2010-05-12 | 2012-07-18 | 李大仁 | 一种空气分离的方法 |
DE102011112909A1 (de) * | 2011-09-08 | 2013-03-14 | Linde Aktiengesellschaft | Verfahren und Vorrichtung zur Gewinnung von Stahl |
JP6115887B2 (ja) * | 2013-03-15 | 2017-04-19 | 住友金属鉱山株式会社 | 酸素圧縮機切替流量測定方法 |
JP7446569B2 (ja) | 2020-04-02 | 2024-03-11 | 日本エア・リキード合同会社 | 製品ガスの供給量調整装置およびそれを備える空気分離装置 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4022030A (en) * | 1971-02-01 | 1977-05-10 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Thermal cycle for the compression of a fluid by the expansion of another fluid |
JPS5324920B2 (fr) * | 1971-12-03 | 1978-07-24 | ||
JP2873469B2 (ja) * | 1989-09-29 | 1999-03-24 | 株式会社大分サンソセンター | 需要変動に対応して空気を液化分離し供給する装置 |
FR2677667A1 (fr) * | 1991-06-12 | 1992-12-18 | Grenier Maurice | Procede d'alimentation d'un haut-fourneau en air enrichi en oxygene, et installation de reduction de minerai de fer correspondante. |
FR2680114B1 (fr) * | 1991-08-07 | 1994-08-05 | Lair Liquide | Procede et installation de distillation d'air, et application a l'alimentation en gaz d'une acierie. |
FR2706195B1 (fr) * | 1993-06-07 | 1995-07-28 | Air Liquide | Procédé et unité de fourniture d'un gaz sous pression à une installation consommatrice d'un constituant de l'air. |
FR2712383B1 (fr) * | 1993-11-12 | 1995-12-22 | Air Liquide | Installation combinée d'une unité de production de métal et d'une unité de séparation de l'air. |
US5454227A (en) * | 1994-08-17 | 1995-10-03 | The Boc Group, Inc. | Air separation method and apparatus |
US5582036A (en) * | 1995-08-30 | 1996-12-10 | Praxair Technology, Inc. | Cryogenic air separation blast furnace system |
FR2745821B1 (fr) * | 1996-03-11 | 1998-04-30 | Air Liquide | Procede de conduite d'une installation comprenant une unite de traitement de metal et une unite de traitement de gaz |
FR2753638B1 (fr) * | 1996-09-25 | 1998-10-30 | Procede pour l'alimentation d'une unite consommatrice d'un gaz | |
FR2774158B1 (fr) * | 1998-01-23 | 2000-03-17 | Air Liquide | Installation combinee d'un four et d'un appareil de distillation d'air et procede de mise en oeuvre |
FR2782787B1 (fr) * | 1998-08-28 | 2000-09-29 | Air Liquide | Procede et installation de production d'oxygene impur par distillation d'air |
FR2789162B1 (fr) * | 1999-02-01 | 2001-11-09 | Air Liquide | Procede de separation d'air par distillation cryogenique |
JP4177507B2 (ja) * | 1999-03-09 | 2008-11-05 | 大陽日酸株式会社 | 低純度酸素の製造方法及び装置 |
JP2000309811A (ja) * | 1999-04-21 | 2000-11-07 | Nippon Steel Corp | 酸素供給設備及び酸素供給方法 |
FR2814178B1 (fr) * | 2000-09-18 | 2002-10-18 | Air Liquide | Alimentation en air enrichi en oxygene d'une unite de production de metal non-ferreux |
FR2819584B1 (fr) * | 2001-01-12 | 2003-03-07 | Air Liquide | Procede integre de separation d'air et de generation d'energie et installation pour la mise en oeuvre d'un tel procede |
-
2003
- 2003-11-10 FR FR0350818A patent/FR2862128B1/fr not_active Expired - Fee Related
-
2004
- 2004-11-10 CN CN200480033074.XA patent/CN100538234C/zh not_active Expired - Fee Related
- 2004-11-10 BR BRPI0416372-9A patent/BRPI0416372A/pt not_active IP Right Cessation
- 2004-11-10 US US10/577,885 patent/US20070221492A1/en not_active Abandoned
- 2004-11-10 EP EP04805825A patent/EP1690054A1/fr not_active Withdrawn
- 2004-11-10 RU RU2006120410/06A patent/RU2354902C2/ru not_active IP Right Cessation
- 2004-11-10 JP JP2006538912A patent/JP2007516405A/ja not_active Ceased
- 2004-11-10 WO PCT/FR2004/050582 patent/WO2005045340A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2005045340A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2007516405A (ja) | 2007-06-21 |
CN100538234C (zh) | 2009-09-09 |
FR2862128B1 (fr) | 2006-01-06 |
US20070221492A1 (en) | 2007-09-27 |
WO2005045340A1 (fr) | 2005-05-19 |
BRPI0416372A (pt) | 2007-02-21 |
FR2862128A1 (fr) | 2005-05-13 |
CN1878998A (zh) | 2006-12-13 |
RU2006120410A (ru) | 2007-12-20 |
RU2354902C2 (ru) | 2009-05-10 |
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