CN102809261A - Cryogenic separation method and cryogenic separation device for preparing low-purity oxygen from air - Google Patents
Cryogenic separation method and cryogenic separation device for preparing low-purity oxygen from air Download PDFInfo
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- CN102809261A CN102809261A CN201210272166XA CN201210272166A CN102809261A CN 102809261 A CN102809261 A CN 102809261A CN 201210272166X A CN201210272166X A CN 201210272166XA CN 201210272166 A CN201210272166 A CN 201210272166A CN 102809261 A CN102809261 A CN 102809261A
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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
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
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- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04163—Hot end purification of the feed air
- F25J3/04169—Hot end purification of the feed air by adsorption of the impurities
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- 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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- 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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- 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
- F25J3/04436—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 at least a triple pressure main column system
- F25J3/04448—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 at least a triple pressure main column system in a double column flowsheet with an intermediate 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
- F25J3/04763—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"
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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
- F25J2200/50—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column
- F25J2200/54—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column in the low pressure column of a double pressure main column system
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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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
- F25J2205/32—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as direct contact cooling tower to produce a cooled gas stream, e.g. direct contact after cooler [DCAC]
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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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
- F25J2205/34—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as evaporative cooling tower to produce chilled water, e.g. evaporative water chiller [EWC]
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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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
- F25J2205/62—Purifying more than one feed stream in multiple adsorption vessels, e.g. for two feed streams at different pressures
Abstract
The invention discloses a cryogenic separation method and a cryogenic separation device for preparing low-purity oxygen from air, and belongs to the field of gas separation methods and devices. The cryogenic separation method includes compressing filtered air into two channels of air at different pressure levels; leading the channel of air with low pressure into a medium-pressure tower and a low-pressure tower to be rectified respectively; and leading the channel of air with high pressure into a high-pressure tower and the medium-pressure tower to be rectified respectively. The cryogenic separation device comprises an air filter and compression system, air precooling systems, air purification systems and a rectifying system. The rectifying system comprises a main heat-exchanger, the high-pressure tower, the low-pressure tower, a main condensing evaporator, a subcooler and the medium-pressure tower, the air is compressed into the two channels of air at the different pressure levels by the air filter and compression system, and each channel of air is sequentially connected with the corresponding air precooling system and the corresponding air purification system respectively, and then is connected with the rectifying system. The cryogenic separation method and the cryogenic separation device for preparing the low-purity oxygen from the air are low in energy consumption.
Description
Technical field
The invention belongs to gas separating method and device field, relate in particular to the method and apparatus of from air, producing low-purity oxygen (90～97%).
Background technology
Striden into since 21 century; Because the great development of upstream industries such as fast growth of national economy and iron and steel, Coal Chemical Industry, petrochemical industry, in great demand to air separation plant grows at top speed the air separation plant industry; According to incompletely statistics, the air separation plant production capacity has reached 4,000,000 Nm every year
3More than/the h.Carry according to data, China's planning required air separation plant oxygen production capacity of Coal Chemical Industry in 2015 is 6,000,000/Nm
3About/h, only this item market space is just surprisingly big.
Safe and reliable, energy-saving and emission-reduction, this is to the basic demand of air separation plant and precondition, is the needs with scientific development of building a resource-conserving and environment-friendly society, and also is the market expectation.Flourish emerging Coal Chemical Industry industry and ripe industries such as Ferrous Metallurgy all need the oxygen of a large amount of low-purity.Be the protection environment, catching carbon dioxide, oxygen-enriched combusting also become a trend of power plant's development.Therefore, safe and reliable, energy-saving and cost-reducing maximization, the low-purity Deep Cooling Method sky of research and development divides extremely urgent.And that at present conventional Deep Cooling Method is separated used two-tower rectification energy consumption is higher, and the extensive environmental protection that has restricted the oxygen of low-purity is used.
Summary of the invention
The objective of the invention is to: propose a kind of energy consumption lower Deep Cooling Method separation method and the device thereof of from air, producing low-purity oxygen.
The object of the invention realizes through following technical proposals:
A kind of Deep Cooling Method separation method of from air, producing low-purity oxygen; With the air that is compressed into two-way different pressures grade after the air filtration; Wherein the lower pressure air cools off, a part further gets into medium pressure column rectifying in the cooling back behind the purifying; Another part gets into lower pressure column rectifying after further cooling off step-down, carries out the cryogenic separation of oxygen, nitrogen respectively; The air of elevated pressures cools off in addition, purifying, supercharging and further get into high-pressure tower and medium pressure column rectifying respectively after the cooling, carries out the cryogenic separation of oxygen, nitrogen respectively.
Wherein the high-pressure tower operating pressure is about 0.58MPa.A; The medium pressure column operating pressure is about 0.3MPa.A; The lower pressure column operating pressure is about 1.42MPa.A;
As optimal way, the pressure of said lower pressure air is 0.28～0.35MPa.A, and the pressure of said elevated pressures air is 0.55～0.59MPa.A.
As further optimal way; Purifying after said lower pressure air is cooled to 10～16 ℃; After further being cooled to-145 ℃ behind the purifying, a part is gone into lower pressure column rectifying through overexpansion is laggard, and another part cools off and is depressurized to-179 ℃, 0.27MPa.A and gets into medium pressure column rectifying.
As further optimal way, purifying after said elevated pressures air is cooled to 10～16 ℃, be pressurized to 5.42MPa.A behind the purifying after, be cooled to-174～-179 ℃ again and get into high-pressure tower and medium pressure column rectifying respectively.
A kind ofly be used for the aforementioned device of producing the Deep Cooling Method separation method of low-purity oxygen from air; Comprise air filtration compressibility, air precooling system, air purge system and distillation system; Said distillation system comprises main heat exchanger, high-pressure tower, lower pressure column, main condenser evaporimeter and subcooler; Said distillation system also comprises medium pressure column; The nitrogen pipeline of said medium pressure column connects the helium outlet of said main condenser evaporimeter, said subcooler and said lower pressure column successively; The liquid air pipeline of said medium pressure column connects said subcooler and said lower pressure column successively, and said air filtration compressibility is compressed into two-way different pressures grade air with air, and connects said distillation system after connecting one road air precooling system, air purge system respectively separately successively: wherein the lower pressure air pipe line is through behind its air precooling system, air purge system and the said main heat exchanger; One the tunnel connects said medium pressure column, and another road connects said lower pressure column after cooling off dropping equipment; The elevated pressures air pipe line is connected said medium pressure column and high-pressure tower respectively through behind its air precooling system, air purge system and compression set and the said main heat exchanger in addition.
As optimal way, said air filtration compressibility comprises the air compressor of a middle odd test, perhaps two air compressors that are connected into two-stage.
As optimal way, said air precooling system comprises air cooling compressor, water-cooling tower, the shared water-cooling tower of air precooling system on the two-way different pressures grade air pipe line of said air filtration compressibility.
As optimal way, said cooling dropping equipment and compression set are respectively the expanding end and the pressurized end of booster expansion turbine.
Each equipment act as:
The air filtration compressibility is mainly used in the physics impurity that filters in the raw air and the compression of raw air.
Air cooling compressor is mainly used in the cooling of the air after the compression, utilizes cooling water and chilled water, is cooled to air about 14 ℃.
Water cooling tower mainly relies on the drying nitrogen from ice chest, provides air cooling compressor required cryogenic freezing water.
Purifier is mainly used in carbon dioxide and the water that removes in the raw air.
Booster expansion turbine is mainly used in provides air separation institute chilling requirement, and supercharging and step-down.
The supercharger aftercooler is mainly used in the temperature of charge air cooling.
Main heat exchanger is mainly used in raw air and the heat exchange of the oxygen that backflows, nitrogen etc.
High-pressure tower, medium pressure column, lower pressure column are mainly used in the cryogenic separation of oxygen, nitrogen.
The main condenser evaporimeter is mainly used in uprising gas or the phegma that each tower body is provided.
Subcooler is mainly used in the cold excessively of liquid air and liquid nitrogen.
Beneficial effect of the present invention: the present invention adopts the air that raw air is divided into two-way different pressures grade; And carry out precooling, purifying respectively; Adopt high-pressure tower, medium pressure column, lower pressure column distillation system at last, with to the minimum change of existing system, but can than the Deep Cooling Method of routine separate used two-tower rectification energy consumption low～(with 6000 air separation units is example more than 8%; See the following form); Obtain splendid technique effect, can be used for oxygen purity, such as oxygen-enriched combusting generating, ironmaking and other Coal Chemical Industry industries 90%～97% user.In addition, shared water-cooling tower of two-way air precooling system and booster expansion turbine have the mode of cooling dropping equipment and compression set effect concurrently, also make it further to cut down the consumption of energy.
Description of drawings
Fig. 1 is an embodiment of the invention equipment flowsheet sketch map;
Wherein self-cleaning strainer 1, first air compressor, 2, the second air compressors 3, first air cooling compressor 41, first air cooling compressor 42, water-cooling tower 7, the first normal temperature water pump 51, the second normal temperature water pump 52, first low temperature water pump 61, second low temperature water pump 62, first purifier 81, second purifier 82, the 3rd purifier 91, the 4th purifier 92, booster expansion turbine 17, supercharging aftercooler 18, main heat exchanger 10, subcooler 15, high-pressure tower 12, medium pressure column 11, lower pressure column 16,, the first main condenser evaporimeter 14, the second main condenser evaporimeter 13.
The specific embodiment
Following non-limiting examples is used to explain the present invention.
A kind of Deep Cooling Method separation method of from air, producing low-purity oxygen (90～97%); With the air that is compressed into two-way different pressures grade after the air filtration; Wherein the lower pressure air cools off, a part further gets into medium pressure column rectifying in the cooling back behind the purifying; Another part gets into lower pressure column rectifying after further cooling off step-down, carries out the cryogenic separation of oxygen, nitrogen respectively; The air of elevated pressures cools off in addition, purifying, supercharging and further get into high-pressure tower and medium pressure column rectifying respectively after the cooling, carries out the cryogenic separation of oxygen, nitrogen respectively.Wherein, the pressure of lower pressure air is 0.28～0.35MPa.A, and the pressure of elevated pressures air is 0.55～0.59MPa.A.Purifying after the lower pressure air is cooled to 10～16 ℃, further be cooled to-145 ℃ behind the purifying after, a part is gone into lower pressure column rectifying through overexpansion is laggard, another part cools off and is depressurized to-179 ℃, 0.27MPa.A and gets into medium pressure column rectifying.Purifying after the elevated pressures air is cooled to 10～16 ℃, be pressurized to 5.42MPa.A behind the purifying after, be cooled to-174～-179 ℃ again and get into high-pressure tower and medium pressure column rectifying respectively.
As shown in Figure 1; A kind ofly be used for the aforementioned device of producing the Deep Cooling Method separation method of low-purity oxygen from air; Comprise air filtration compressibility, air precooling system, air purge system, booster expansion turbine system and distillation system; The air filtration compressibility comprises that self-cleaning strainer 1, Liang Tai are connected into first air compressor 2 and second air compressor 3 of two-stage; Two air compressors are compressed into the air of two-way different pressures grade with raw air, and the mode of taking out was combined into an air compressor during perhaps two air compressors also can adopt.Air precooling system comprises first air cooling compressor 41, second air cooling compressor 42, water-cooling tower 7, the first normal temperature water pump 51, the second normal temperature water pump 52, first low temperature water pump 61, second low temperature water pump 62; First air cooling compressor 41 and second air cooling compressor, 42 shared water-cooling towers 7; Wherein the first normal temperature water pump 51, first low temperature water pump 61 are that first air cooling compressor 41 supplies water; The second normal temperature water pump 52, second low temperature water pump 62 are that second air cooling compressor 42 supplies water; Perhaps the normal temperature water pump and the low temperature water pump of two cover air cooling compressors can be combined as a cover, and its two groups first and second normal temperature water pumps and low temperature water pump can adopt standby mode then.The air purge system comprises first and second purifier 81,82, third and fourth purifier 91,92 and regenerative system, and the adsorbent of purifier adopts molecular sieve and aluminium oxide, and utilizes the nitrogen that backflows that purifier is regenerated.The booster expansion turbine system comprises booster expansion turbine 17 and supercharging aftercooler 18.Distillation system comprises main heat exchanger 10, high-pressure tower 12, medium pressure column 11, lower pressure column 16, the first main condenser evaporimeter 14, the second main condenser evaporimeter 13 and subcooler 15, and high-pressure tower 12 adopts sieve-plate tower or regular packed towers with medium pressure column 11; Lower pressure column 16 adopts regular packed tower; Main heat exchanger 10, the first main condenser evaporimeter 14 and the second main condenser evaporimeter 13 all adopt plate-fin heat exchanger.After the nitrogen pipeline of medium pressure column 11 connects the helium outlet of the first main condenser evaporimeter 14, subcooler 15 and lower pressure column 16 successively; The product nitrogen gas of its product nitrogen gas and high-pressure tower 12, lower pressure column 16 gets into the system product nitrogen pipeline in the lump, and the liquid air pipeline of medium pressure column 11 connects subcooler 15 successively participates in further separating with lower pressure column 16 backs.
This device air filtration compressibility is compressed into two-way different pressures grade air with air; And connect successively separately respectively and connect distillation system after one road air precooling system, the air purge system: wherein the lower pressure air pipe line is through first air cooling compressor 41, first and second purifier 81,82; And behind the main heat exchanger 10; One the tunnel connects medium pressure column 11 carries out rectifying, and another road connects lower pressure column 16 after through the expanding end of booster expansion turbine 17 and carries out rectifying; Be connected medium pressure column 11 respectively behind the pressurized end of elevated pressures air pipe line through second air cooling compressor 42, third and fourth purifier 91,92 and booster expansion turbine 17 and the main heat exchanger 10 in addition and high-pressure tower 12 carries out rectifying.
Main flow process is described:
Air flow circuit: air gets into first air compressor 2 through behind the self-cleaning strainer 1, and portion of air gets into first air cooling compressor 41 after compression, is cooled to about 14 ℃, gets into first and second purifier 81,82 and removes CO
2And moisture content.Advanced behind the purifying air through main heat exchanger 10 coolings after, a part gets into medium pressure column 11 and carries out rectifying, a part gets into lower pressure columns 16 and carries out rectifying through booster expansion turbine 17 back of expanding;
Another part continues to get into second air cooling compressor 42 through after 3 compressions of second air compressor, is cooled to about 14 ℃, gets into third and fourth purifier 91,92 and removes CO
2And moisture content.After the pressurized end supercharging through the air entering booster expansion turbine 17 after evolving, get into 18 coolings of supercharger aftercooler, after main heat exchanger 10 coolings, get into high-pressure tower 12 respectively and carry out rectifying with medium pressure column 11.
The oxygen stream: the oxygen that produces from lower pressure column 16 bottoms, through seeing ice chest off after main heat exchanger 10 re-heats.
Nitrogen flow: the nitrogen that produces from lower pressure column 16 tops, after subcooler 15, main heat exchanger 10 re-heats, except that product nitrogen gas, other all send into water cooling tower 7 cooling waters.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. Deep Cooling Method separation method of from air, producing low-purity oxygen; It is characterized in that: with the air that is compressed into two-way different pressures grade after the air filtration; Wherein the lower pressure air cools off, a part further gets into medium pressure column rectifying in the cooling back behind the purifying; Another part gets into lower pressure column rectifying after further cooling off step-down, carries out the cryogenic separation of oxygen, nitrogen respectively; The air of elevated pressures cools off in addition, purifying, supercharging and further get into high-pressure tower and medium pressure column rectifying respectively after the cooling, carries out the cryogenic separation of oxygen, nitrogen respectively.
2. the Deep Cooling Method separation method of from air, producing low-purity oxygen as claimed in claim 1 is characterized in that: the pressure of said lower pressure air is 0.28～0.35MPa.A, and the pressure of said elevated pressures air is 0.55～0.59MPa.A.
3. the Deep Cooling Method separation method of from air, producing low-purity oxygen as claimed in claim 2; It is characterized in that: purifying after said lower pressure air is cooled to 10～16 ℃; After further being cooled to-145 ℃ behind the purifying; A part is gone into lower pressure column rectifying through overexpansion is laggard, and another part cools off and is depressurized to-179 ℃, 0.27MPa.A and gets into medium pressure column rectifying.
4. the Deep Cooling Method separation method of from air, producing low-purity oxygen as claimed in claim 2; It is characterized in that: purifying after said elevated pressures air is cooled to 10～16 ℃; After being pressurized to 5.42MPa.A behind the purifying, being cooled to-174～-179 ℃ again and getting into high-pressure tower and medium pressure column rectifying respectively.
5. one kind is used for the described device of from air, producing the Deep Cooling Method separation method of low-purity oxygen of the arbitrary claim of claim 1 to 4; Comprise air filtration compressibility, air precooling system, air purge system and distillation system; Said distillation system comprises main heat exchanger, high-pressure tower, lower pressure column, main condenser evaporimeter and subcooler; It is characterized in that: said distillation system also comprises medium pressure column; The nitrogen pipeline of said medium pressure column connects the helium outlet of said main condenser evaporimeter, said subcooler and said lower pressure column successively; The liquid air pipeline of said medium pressure column connects said subcooler and said lower pressure column successively; Said air filtration compressibility is compressed into two-way different pressures grade air with air; And connect said distillation system after connecting one road air precooling system, air purge system respectively separately successively: wherein the lower pressure air pipe line is through behind its air precooling system, air purge system and the said main heat exchanger, and one the tunnel connects said medium pressure column, and another road connects said lower pressure column after cooling off dropping equipment; The elevated pressures air pipe line is connected said medium pressure column and high-pressure tower respectively through behind its air precooling system, air purge system and compression set and the said main heat exchanger in addition.
6. the Deep Cooling Method separator of from air, producing low-purity oxygen as claimed in claim 5, it is characterized in that: said air filtration compressibility comprises the air compressor of a middle odd test, perhaps two air compressors that are connected into two-stage.
7. the Deep Cooling Method separator of from air, producing low-purity oxygen as claimed in claim 5; It is characterized in that: said air precooling system comprises air cooling compressor, water-cooling tower, the shared water-cooling tower of air precooling system on the two-way different pressures grade air pipe line of said air filtration compressibility.
8. the Deep Cooling Method separator of from air, producing low-purity oxygen as claimed in claim 5 is characterized in that: said cooling dropping equipment and compression set are respectively the expanding end and the pressurized end of booster expansion turbine.
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