EP2783176A2 - Procédé et installation de séparation d'air par distillation cryogénique - Google Patents
Procédé et installation de séparation d'air par distillation cryogéniqueInfo
- Publication number
- EP2783176A2 EP2783176A2 EP12806557.0A EP12806557A EP2783176A2 EP 2783176 A2 EP2783176 A2 EP 2783176A2 EP 12806557 A EP12806557 A EP 12806557A EP 2783176 A2 EP2783176 A2 EP 2783176A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- liquid
- air
- frequency
- compressor
- 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- Withdrawn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
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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
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
- F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04012—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04048—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams
- F25J3/04054—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of cold gaseous streams, e.g. intermediate or oxygen enriched (waste) streams of air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
- F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04109—Arrangements of compressors and /or their drivers
- F25J3/04115—Arrangements of compressors and /or their drivers characterised by the type of prime driver, e.g. hot gas expander
- F25J3/04133—Electrical motor as the prime mechanical driver
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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
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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
- F25J3/04296—Claude expansion, i.e. expanded into the main or 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
- F25J3/04406—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
- 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
- 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
- power grids are not sufficiently “strong” and meshed to avoid major disturbances in the frequency of their network during high demand or during hot weather, both of which are often concomitant.
- Air separation devices (ASUs) on such networks are severely disrupted.
- ASUs Air separation devices
- the invention makes it possible, for example when the customer is a steel industry, to continue to produce the flow rate of oxygen and / or nitrogen requested, even during the important changes of frequency, while having a conservation of a good energy. specific on outgoing products.
- the invention is also of particular interest in cases where the pressure of gas production by the separating apparatus is not the same as the pressure of use of the gas by the customer, for example, thanks to the presence interposed a buffer capacity.
- US-A-5471843 discloses an air separation process in which the vapor pressure of liquid oxygen is reduced, if the oxygen demand is reduced. At the same time, it reduces the air flow to be treated but the motor is driven by a constant speed motor. Thus, the logical sequence of events is the opposite of that of our invention and is not conditioned by the observation of a decrease in frequency.
- EP-A-1845323 describes an air separation process in which the vaporization pressure of the liquid oxygen is a function of the pressure of which the tank containing the vaporized oxygen. Neither the motorization of the compressor nor the regulation according to the frequency of the electricity are mentioned.
- rich in oxygen means that the fluid contains at least 70 mol% of oxygen.
- a flow of air is compressed in a compressor, is cooled by an exchange line and sent to a column system where it separates to form a nitrogen-enriched flow and an oxygen-enriched flow rate
- the compressor is driven by a motor powered by electricity having a first frequency
- a liquid flow is withdrawn from the column system, pressurized at a first pressure by a pump and vaporized by indirect heat exchange with air from the compressor to produce a gaseous product substantially at the first pressure; a case of a liquid flow rich in oxygen, sent at the first pressure to the head of an auxiliary column supplied in the tank with air coming from the compressor, oxygen gas being withdrawn at the top of the column as product and an intermediate liquid of the auxiliary column of the auxiliary column being sent to the column system.
- the pressurization pressure of the liquid flow is reduced to a second pressure lower than the first pressure.
- the compressor compresses air from the atmospheric pressure.
- the compressor compresses air from a pressure greater than
- the oxygen-rich liquid flow is sent at the first pressure to the head of the auxiliary column fed in the tank with air coming from the compressor, oxygen gas being drawn off at the top of the column as product and at least one liquid being sent from the auxiliary column to the column system.
- the liquid flow rate has a flow rate V and if the frequency is lower than the given threshold lower than the first frequency at the first frequency the liquid flow rate at least equal to 0.9V, or even at least equal to at 0.95V or even equal to V.
- the pressure of the pressurization of the liquid is lowered if the measured air flow passes below a threshold with respect to the air flow required to reach the nominal value of the liquid flow rate at the first pressurization pressure.
- the pressurization pressure of the liquid is lowered if the measured air pressure falls below a threshold with respect to the air pressure required to reach the nominal value of the liquid flow rate at the first pressurization pressure.
- the pressurization pressure of the liquid is reduced only by modifying the operation of the pressurizing pump.
- the output pressure of the pump is equal to the vaporization pressure of the liquid pressurized by the pump.
- the vaporized liquid serves as a product for the vaporization pressure without undergoing expansion downstream of the vaporization.
- an air separation installation by cryogenic distillation comprising a compressor, an exchange line, a column system, an electric motor for driving the compressor, a pipe for withdrawing a column system liquid, a pump for pressurizing the withdrawn liquid and means for permitting direct or indirect heat exchange between compressed air by the compressor and the pressurized liquid, optionally the means also allowing a mass exchange if the pressurized liquid is rich in oxygen, characterized in that it comprises means for regulating the pressure of the pressurized liquid in the pump as a function of the frequency of the electricity supplying the electric motor.
- the installation comprises:
- means for regulating the pressure of the pressurized liquid by action of the control system on the flow and / or the outlet pressure of the pump means for measuring the frequency supplying the electric motor, the means for regulating the pressurization pressure of the liquid being able to be turned on if the frequency falls below a threshold.
- a booster means for sending air from the compressor to the booster and booster to the exchange line, the booster being driven by the or a motor powered by electricity having one or frequency.
- the separation apparatus comprises a compressor 100, an exchange line 4, a booster 7, a turbine 27, a pump 6 and a double distillation column 1 comprising a medium pressure column 2 and a low pressure column 3.
- a double column could be replaced by a triple column or that other columns could be added such as a column of argon mixture etc.
- the thermal coupling means shown is to heat the bottom of the low pressure column with nitrogen from the medium pressure column, but other means of thermal coupling can be envisaged.
- the booster illustrated is a cold booster having an inlet temperature lower than that of the hot end of the exchange line 4.
- the invention also applies to cases using a booster having an inlet temperature equal to or greater than that hot end of the exchange line 4.
- Air is compressed in the compressor 100, which is driven by an electric motor powered by a source of electricity having a nominal frequency, for example 50Hz (in Europe) or 60Hz (in the United States).
- the compressed air is cooled and purified to form the flow 19 and then sent to the exchange line 4.
- the air cools in the exchange line and is then divided in two, a part 20 continuing to cool to the cold end of the exchanger and being sent to the medium pressure column 2 in gaseous form.
- the rest of the air 21 is sent to a cold booster 7, is supercharged at high pressure and then returned to the exchange line as a flow 22.
- Part of the pressurized air 23 is expanded in a turbine 27 and sent to the medium pressure column then that the rest of the supercharged air continues cooling to the cold end, is expanded in a valve 28 and sent to the medium pressure column.
- Rich liquid 1 1 is sent from the tank of the medium pressure column via the valve 12 and the subcoolers 5A, 5B and liquid nitrogen 13 is sent to the top of the low pressure column 3 via the valve 14. the low pressure nitrogen is heated in the subcoolers 5A, 5B and the exchange line 4.
- Liquid oxygen 16 is withdrawn in the bottom of the low pressure column 3, pressurized by the pump 6 and vaporized at a first high pressure in the exchange line 4.
- the booster 7 is also driven by an electric motor M powered by an electric current.
- the flow and / or the pressure of the compressed air may be insufficient to vaporize the oxygen at the first high pressure.
- the pressurizing pressure of the pump 6 is reduced to vaporize the oxygen at a lower pressure.
- the triggering of this pressure reduction can be done by measuring the frequency of electricity supplied to the motor and / or by measuring the compressed air flow 19, 22 and / or the pressure of the compressed air flow 19, 22.
- the frequency and / or the flow rate and / or the pressure pass below a given threshold (of given thresholds)
- the pressure of the oxygen can be reduced while keeping a production flow "close" to the nominal flow rate. .
- the apparatus can still operate despite the reduced frequency, at the cost of producing vaporized oxygen at lower pressure.
- the invention is also applicable to the vaporization of liquid nitrogen.
- a flow of oxygen gas 37 is withdrawn at the top of the column 33 and heated in the exchanger 4.
- An oxygen-enriched liquid 37 is withdrawn from the tank of the column 33, expanded in a valve 43 and sent to the lower column pressure 3. It is also necessary to withdraw a liquid 39 at an intermediate level of the auxiliary column 33, to relax in a valve 41 and send it to the column system.
- the mixing column 33 operates at a reduced pressure, to compensate for the reduction in pressure of the air flow 31.
- the reduction of the frequency for all the cases of application of the invention, can last a few minutes, a few hours or even a few days. It goes without saying that the decision to lower the pressure of pressurization will be made according to the needs of the customer and if a reduction of product due to the reduction of frequency can be tolerated, it will not be necessary necessarily to use the process of the 'invention.
- the pressurization pressure is increased again by reversing the actions taken to reduce the pressure in case of frequency reduction.
- the pressurized liquid flow will remain constant, regardless of the frequency, but a decrease of up to 5%, or even up to 10% of the flow at normal frequency can sometimes be tolerated.
- the reduction of the pressurization pressure in the event of a drop in frequency can be triggered by detecting that an air flow to be separated decreases. Often a reduction with respect to the nominal flow rate can be compensated at least partially by adjusting the compressors.
- the reduction of the pressurization pressure in the event of a drop in frequency can be triggered by detecting that the pressure of an air flow to be separated decreases. Often a reduction from the nominal pressure can be at least partially compensated by adjusting the compressors. On the other hand, at a given threshold below the nominal pressure, it will be necessary to proceed according to the invention since the regulation of the compressors can no longer suffice to fill the pressure drop.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1160775A FR2983287B1 (fr) | 2011-11-25 | 2011-11-25 | Procede et installation de separation d'air par distillation cryogenique |
PCT/FR2012/052707 WO2013076430A2 (fr) | 2011-11-25 | 2012-11-23 | Procédé et installation de séparation d'air par distillation cryogénique |
Publications (1)
Publication Number | Publication Date |
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EP2783176A2 true EP2783176A2 (fr) | 2014-10-01 |
Family
ID=47436054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12806557.0A Withdrawn EP2783176A2 (fr) | 2011-11-25 | 2012-11-23 | Procédé et installation de séparation d'air par distillation cryogénique |
Country Status (5)
Country | Link |
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US (1) | US20140283550A1 (fr) |
EP (1) | EP2783176A2 (fr) |
CN (1) | CN104321602A (fr) |
FR (1) | FR2983287B1 (fr) |
WO (1) | WO2013076430A2 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160186930A1 (en) * | 2014-02-28 | 2016-06-30 | Praxair Technology, Inc. | Pressurized product stream delivery |
JP6415989B2 (ja) | 2015-01-05 | 2018-10-31 | 三菱重工サーマルシステムズ株式会社 | 液化ガス用冷却装置 |
US10634425B2 (en) * | 2016-08-05 | 2020-04-28 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Integration of industrial gas site with liquid hydrogen production |
US10393431B2 (en) * | 2016-08-05 | 2019-08-27 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method for the integration of liquefied natural gas and syngas production |
JP6750120B2 (ja) * | 2016-08-30 | 2020-09-02 | 8 リバーズ キャピタル,エルエルシー | 高圧酸素を生成するための深冷空気分離方法 |
WO2024167889A1 (fr) * | 2023-02-09 | 2024-08-15 | Polarean, Inc. | Systèmes de cryocapture, procédés associés et hyperpolariseurs dotés des systèmes de cryocapture |
US20240271867A1 (en) * | 2023-02-09 | 2024-08-15 | Polarean, Inc. | Cryo-collection systems and related methods and hyperpolarizer systems |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5471843A (en) * | 1993-06-18 | 1995-12-05 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and installation for the production of oxygen and/or nitrogen under pressure at variable flow rate |
FR2706595B1 (fr) * | 1993-06-18 | 1995-08-18 | Air Liquide | Procédé et installation de production d'oxygène et/ou d'azote sous pression à débit variable. |
JPH11132653A (ja) * | 1997-10-29 | 1999-05-21 | Kobe Steel Ltd | 空気分離方法及びその装置 |
FR2784308B1 (fr) * | 1998-10-09 | 2001-11-09 | Air Liquide | Procede et installation de separation de gaz avec production d'un debit gazeux variable |
FR2854683B1 (fr) * | 2003-05-05 | 2006-09-29 | Air Liquide | Procede et installation de production de gaz de l'air sous pression par distillation cryogenique d'air |
FR2862746B1 (fr) * | 2003-11-25 | 2007-01-19 | Air Liquide | Procede et installation de separation d'air par distillation cryogenique |
EP1845323A1 (fr) * | 2006-04-13 | 2007-10-17 | Linde Aktiengesellschaft | Procédé et dispositif de production d'un produit sous haute pression par séparation cryogénique d'air |
CN101779092A (zh) * | 2007-08-10 | 2010-07-14 | 乔治洛德方法研究和开发液化空气有限公司 | 用于通过低温蒸馏分离空气的方法和设备 |
-
2011
- 2011-11-25 FR FR1160775A patent/FR2983287B1/fr active Active
-
2012
- 2012-11-23 CN CN201280057392.4A patent/CN104321602A/zh active Pending
- 2012-11-23 US US14/359,305 patent/US20140283550A1/en not_active Abandoned
- 2012-11-23 WO PCT/FR2012/052707 patent/WO2013076430A2/fr active Application Filing
- 2012-11-23 EP EP12806557.0A patent/EP2783176A2/fr not_active Withdrawn
Non-Patent Citations (1)
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See references of WO2013076430A2 * |
Also Published As
Publication number | Publication date |
---|---|
FR2983287B1 (fr) | 2018-03-02 |
WO2013076430A3 (fr) | 2015-07-02 |
FR2983287A1 (fr) | 2013-05-31 |
US20140283550A1 (en) | 2014-09-25 |
WO2013076430A2 (fr) | 2013-05-30 |
CN104321602A (zh) | 2015-01-28 |
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