CN107300294A - A kind of co 2 liquefaction device and method of flue gas carbon trapping system - Google Patents

A kind of co 2 liquefaction device and method of flue gas carbon trapping system Download PDF

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Publication number
CN107300294A
CN107300294A CN201710658357.2A CN201710658357A CN107300294A CN 107300294 A CN107300294 A CN 107300294A CN 201710658357 A CN201710658357 A CN 201710658357A CN 107300294 A CN107300294 A CN 107300294A
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gas
entrance
low temperature
outlet
compressor
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CN107300294B (en
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汪世清
郭东方
牛红伟
刘练波
郜时旺
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
    • F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0027—Oxides of carbon, e.g. CO2
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0221—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop
    • F25J1/0222—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using the cold stored in an external cryogenic component in an open refrigeration loop in combination with an intermediate heat exchange fluid between the cryogenic component and the fluid to be liquefied
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0262—Details of the cold heat exchange system
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • 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
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0294—Multiple compressor casings/strings in parallel, e.g. split arrangement
    • 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/80—Carbon dioxide
    • 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
    • F25J2215/80—Carbon dioxide
    • 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
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/80—Separating impurities from carbon dioxide, e.g. H2O or water-soluble contaminants
    • 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
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/80—Separating impurities from carbon dioxide, e.g. H2O or water-soluble contaminants
    • F25J2220/84—Separating high boiling, i.e. less volatile components, e.g. NOx, SOx, H2S
    • 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a kind of co 2 liquefaction device and method of flue gas carbon trapping system, the device includes surge tank, surge tank entrance is connected with the regeneration feed channel from carbon trapping system, surge tank outlet is connected with low temperature dehumidification device high temperature side entrance, and low temperature dehumidification device high temperature side outlet is sequentially connected activated carbon tower, molecular sieve tower, the first CO2Compressor, condenser, choke valve and gas-liquid separator, gas-liquid separator liquid outlet are connected with booster pump inlet, boosting pump discharge and liquid CO2Reservoir inlet is connected, and gas-liquid separator gas vent is connected with low temperature dehumidification device low temperature side entrance, low temperature dehumidification device low temperature side outlet and the 2nd CO2Suction port of compressor is connected, the 2nd CO2Compressor outlet is connected with condenser inlet；The invention also discloses the method that the device carries out co 2 liquefaction；Utilize High-pressure supercritical CO2Throttling expansion realizes that itself liquefies, and then realizes liquid CO by booster supercharging2Supercooling, so as to eliminate independent ammonia cold refrigeration system.

Description

A kind of co 2 liquefaction device and method of flue gas carbon trapping system
Technical field
The invention belongs to reduction of greenhouse gas discharge and gas liquefaction technical field, and in particular to a kind of flue gas carbon trapping system Co 2 liquefaction device and method.
Background technology
Carbon dioxide (CO2) it is topmost greenhouse gases.During industrial production (oil, electric power, chemical industry, cement etc.) Substantial amounts of carbon dioxide is discharged to air, causes global climate change, the sustainable development of human civilization society is threatened Exhibition.
Smoke carbon dioxide capture, using with sealing (CCUS) technology up for safekeeping it is widely regarded as realizing that extensive greenhouse gases subtract Row, the important technology approach of containment climate change.Being as the chemical absorption method of carbon dioxide absorption solvent using organic amine ought The smoke carbon dioxide capture technology of preceding main flow, has developed megaton technical grade demonstration plant.Due in CCUS technology chains Carbon dioxide utilize and have a certain distance with the geographical position of capturing device, it is necessary to by CO with sealing up for safekeeping often2From trap sites fortune It is defeated to utilization/seal place up for safekeeping.For the ease of transport, it is necessary to by the CO of trapping2Gas is liquefied, and is then transported by tank car It is defeated.
Trapped and regenerated from flue gas by chemical absorption method come carbon dioxide regeneration gas temperature be about 40-50 DEG C, Pressure is about 150-200kPa (absolute pressure), CO2Purity is about 95%, in addition also nearly 5% moisture and micro O2、N2、 The foreign gases such as NO, ammonia.Conventional liquefaction mode is as shown in Figure 1.
The technological process of conventional liquefaction system is as follows：
CO from carbon trapping system2The buffered tank 1 of regeneration gas (150kPa, 40 DEG C) enters low temperature dehumidification device 2 after buffering About 5% moisture in cool-down dehumidification, removing regeneration gas；CO after dehumidifying2Gas is by CO2Compressor 3 is compressed to about 2.5MPa, compressor carries cooling system, by the gas cooling after compression to 35~40 DEG C；CO after compression2Gas, which enters, lives Property charcoal tower 4 remove the trace amount of foreign gas such as organic volatile VOCs and ammonia, carry out depth dehumidifying subsequently into molecular sieve tower 5, To meet technical grade CO2Standard；Purified gas is cooled to about -20 DEG C (subcooled liquids) into ammonia cooler 6, and CO is subcooled2Liquid Then liquid CO is injected into the presence of system pressure2Storage tank 7 is stored.
Conventional CO2Liquifying method is that nucleus equipment is ammonia cooling system, and it is by ammonia compressor 8, ammonia condenser 9, choke valve 10 Constituted with ammonia cooler 6.Ammonia cooler 6 is also known as ammonia evaporator, in ammonia cooler 6, cold side liquefied ammonia evaporation endothermic at -33 DEG C, by heat Survey high pressure CO2Gas-condensate liquid.The low temperature ammonia steam of the cold side outlet port of ammonia cooler 6 enters low temperature dehumidification device 2, will flow through low temperature and removes The CO that the wet heat of device 2 is surveyed2Air-flow cool-down dehumidification；The ammonia of the cold side outlet port of low temperature dehumidification device 2 enters ammonia compressor 8, is compressed to about 1.5 ~2MPa, is then condensed to 35~40 DEG C, by the throttling expansion of choke valve 10 cooling part occurs for high pressure ammonia by condenser 9 Liquefaction, liquefied ammonia enters ammonia cooler 6, the CO to flowing through ammonia cooler 62Gas carries out cooling liquefaction, completes ammonia refrigeration circulation.
Conventional CO2Liquefaction system is using ammonia cold as refrigeration system, and ammonia cold needs timing supplement liquefied ammonia, therefore, needs The storage and transport of liquefied ammonia are carried out in power plant.Liquefied ammonia is a kind of inflammable, with penetrating odor hazardous chemical, therefore electricity Factory is for the management of ammonia and using very strict.It can be seen that, seek a kind of CO without using ammonia cold2Liquefaction system, improves power plant The security of carbon trapping system, is very significant.
The content of the invention
In order to overcome the problem of above-mentioned prior art is present, it is an object of the invention to provide a kind of flue gas carbon trapping system Co 2 liquefaction device and method, utilize High-pressure supercritical CO2Throttling expansion realizes that itself liquefies, and then passes through booster Liquid CO is realized in supercharging2Supercooling, so as to eliminate independent ammonia cold refrigeration system.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
A kind of co 2 liquefaction device of flue gas carbon trapping system, including surge tank 1, the entrance of surge tank 1 is with coming from carbon The regeneration feed channel of trapping system is connected, and the outlet of surge tank 1 is connected with the high temperature side entrance of low temperature dehumidification device 2, and low temperature dehumidification device 2 is high Warm side outlet is connected with the entrance of activated carbon tower 3, activated carbon tower 3 outlet is connected with the entrance of molecular sieve tower 4, molecular sieve tower 4 export and First CO2The entrance of compressor 5 is connected, the first CO2The outlet of compressor 5 is connected with the entrance of condenser 6, and condenser 6 is exported and choke valve 7 entrances are connected, and the outlet of choke valve 7 is connected with the entrance of gas-liquid separator 8, the liquid outlet of gas-liquid separator 8 and the entrance phase of booster 9 Even, the outlet of booster 9 and liquid CO2The entrance of storage tank 10 is connected, the gas vent of gas-liquid separator 8 and the low temperature side of low temperature dehumidification device 2 Entrance is connected, the low temperature side outlet of low temperature dehumidification device 2 and the 2nd CO2The entrance of compressor 11 is connected, the 2nd CO2Compressor 11 export with The entrance of condenser 6 is connected.
The co 2 liquefaction method of the co 2 liquefaction device of the flue gas carbon trapping system：
CO from carbon trapping system2The buffered tank 1 of regeneration gas (150kPa, 40 DEG C) enters low temperature dehumidification device 2 after buffering About 5% moisture in cool-down dehumidification, removing regeneration gas；；CO after dehumidifying2Gas removes organic wave into activated carbon tower 3 Stimulating food VOCs and trace amount of foreign gas, carry out depth dehumidifying, to meet technical grade CO subsequently into molecular sieve tower 42Standard；Molecule Sieve the CO that tower 4 flows out2Gas is by the first CO2Compressor 5 is compressed to 10~15Mpa supercriticality, then by condenser 6 It is cooled to 35~40 DEG C, supercritical CO2By the throttling expansion of choke valve 7, pressure is down to 1.5~2MPa, and temperature is down to -25 DEG C, CO2Generation partial liquefaction；CO after liquefaction2Separated by knockout drum 8, then boost to 2.5MPa by booster 9, obtain To the liquid CO of supercooling2, and it is pressed into liquid CO2Storage tank 10 is stored；The not liquefied low temperature that knockout drum 8 is separated CO2Gas passes through low temperature dehumidification device 2, and CO is surveyed to heat2Gas carries out cool-down dehumidification, then through the 2nd CO2Compressor 11 is compressed to 10 ~15MPa's is overcritical, with the first CO2The supercritical CO that compressor 5 is exported2Enter condenser 6 after mixing, then throttled Expansion liquefaction.
With conventional CO2Liquefying plant is compared, and the present invention has following characteristics：
1) routine CO2Liquefying plant is by independent kind of refrigeration cycle, to CO2Product gas carries out indirect heat exchange and reaches cooling Liquefied purpose；And CO of the present invention2Liquefying plant does not have independent kind of refrigeration cycle, but by CO2Product gas is pressed Contracting, throttling expansion reach itself cooling liquefaction.
2) routine CO2Liquefying plant uses ammonia as refrigeration working medium；CO of the present invention2Liquefying plant does not have independent system SAPMAC method, therefore it is not related to the use of refrigeration working medium.
3) conventional CO2Liquefying plant either CO2Compressor or ammonia compressor pressure are all in below 2.5MPa；This hair The bright CO2Liquefying plant is related to more than 10MPa high-pressure system, higher to pressure requirements.
4) CO of the present invention2Liquefying plant and routine CO2The energy consumption level of liquefying plant is suitable.
Brief description of the drawings
Fig. 1 is conventional flue gas carbon trapping system co 2 liquefaction schematic device.
Fig. 2 is flue gas carbon trapping system co 2 liquefaction schematic device of the present invention.
Embodiment
For the clear explanation present invention, with reference to embodiment and accompanying drawing, the present invention will be described in further detail.Ability Field technique personnel understand, the description below is not limiting the scope of the invention, it is any make on the basis of the present invention change Enter and change, all within protection scope of the present invention.
According to the preferred embodiment of the invention, the co 2 liquefaction device technique flow and system of flue gas carbon trapping system Device attachment structure is as shown in Figure 2.
A kind of co 2 liquefaction device of flue gas carbon trapping system of the present invention, including following equipment：
Surge tank 1, low temperature dehumidification device 2, activated carbon tower 3, molecular sieve tower 4, CO2Compressor 5, condenser 6, choke valve 7, gas Liquid knockout drum 8, booster 9, liquid CO2Storage tank 10, CO2Compressor 11.
Each system of technique and equipment connection mode are as follows：
The entrance of surge tank 1 is connected with the regeneration feed channel from carbon trapping system, the outlet of surge tank 1 and low temperature dehumidification device 2 High temperature side entrance is connected, and the high temperature side outlet of low temperature dehumidification device 2 is connected with the entrance of activated carbon tower 3, and activated carbon tower 3 is exported and molecular sieve The entrance of tower 4 is connected, the outlet of molecular sieve tower 4 and the first CO2The entrance of compressor 5 is connected, the first CO2Compressor 5 is exported and condenser 6 Entrance is connected, and the outlet of condenser 6 is connected with the entrance of choke valve 7, and the outlet of choke valve 7 is connected with the entrance of gas-liquid separator 8, gas-liquid point It is connected from the liquid outlet of device 8 with the entrance of booster 9, the outlet of booster 9 and liquid CO2The entrance of storage tank 10 is connected, gas-liquid separator 8 Gas vent is connected with the low temperature side entrance of low temperature dehumidification device 2, the low temperature side outlet of low temperature dehumidification device 2 and the 2nd CO2Compressor 11 enters Mouth is connected, the 2nd CO2The outlet of compressor 11 is connected with the entrance of condenser 6.
The technological process of system of the present invention is as follows：
CO from carbon trapping system2The buffered tank 1 of regeneration gas (150kPa, 40 DEG C) enters low temperature dehumidification device 2 after buffering About 5% moisture in cool-down dehumidification, removing regeneration gas；；CO after dehumidifying2Gas removes organic wave into activated carbon tower 3 The trace amount of foreign gas such as stimulating food VOCs and ammonia, carries out depth dehumidifying, to meet technical grade CO subsequently into molecular sieve tower 42Mark It is accurate；The CO that molecular sieve tower 4 flows out2Gas is by the first CO2Compressor 5 is compressed to 10~15MPa (overcritical), then by condensation Device 6 is cooled to 35~40 DEG C, supercritical CO2By the throttling expansion of choke valve 7, pressure is down to about 1.5~2MPa, and temperature is down to About -25 DEG C, CO2Generation partial liquefaction.CO after liquefaction2Separate, then boosted to by booster 9 by knockout drum 8 2.5MPa, the liquid CO being subcooled2, and it is pressed into liquid CO2Storage tank 10 is stored.The non-liquid that knockout drum 8 is separated The low temperature CO of change2Gas passes through low temperature dehumidification device 2, and CO is surveyed to heat2Gas carries out cool-down dehumidification, then through the 2nd CO2Compressor 11 10~15MPa (overcritical) is compressed to, with the first CO2The supercritical CO that compressor 5 is exported2Enter condenser 6 after mixing, then Carry out throttling expansion liquefaction.

Claims (2)

1. a kind of co 2 liquefaction device of flue gas carbon trapping system, including surge tank (1), surge tank (1) entrance is with coming from The regeneration feed channel of carbon trapping system is connected, it is characterised in that：Surge tank (1) is exported and low temperature dehumidification device (2) high temperature side entrance It is connected, low temperature dehumidification device (2) high temperature side outlet is connected with activated carbon tower (3) entrance, activated carbon tower (3) outlet and molecular sieve tower (4) entrance is connected, molecular sieve tower (4) outlet and the first CO2Compressor (5) entrance is connected, the first CO2Compressor (5) export with it is cold Condenser (6) entrance is connected, and condenser (6) outlet is connected with choke valve (7) entrance, choke valve (7) outlet and gas-liquid separator (8) Entrance is connected, and gas-liquid separator (8) liquid outlet is connected with booster (9) entrance, booster (9) outlet and liquid CO2Storage tank (10) entrance is connected, and gas-liquid separator (8) gas vent is connected with low temperature dehumidification device (2) low temperature side entrance, low temperature dehumidification device (2) Low temperature side outlet and the 2nd CO2Compressor (11) entrance is connected, the 2nd CO2Compressor (11) is exported and condenser (6) entrance phase Even.
2. the co 2 liquefaction method of the co 2 liquefaction device of flue gas carbon trapping system, its feature described in claim 1 It is：CO from carbon trapping system2Enter low temperature dehumidification device (2) cool-down dehumidification after the buffered tank of regeneration gas (1) buffering, remove About 5% moisture in regeneration gas；；CO after dehumidifying2Gas enters activated carbon tower (3) and removes organic volatile VOCs and micro- Foreign gas is measured, depth dehumidifying is carried out subsequently into molecular sieve tower (4), to meet technical grade CO2Standard；Molecular sieve tower (4) flows The CO gone out2Gas is by the first CO2Compressor (5) is compressed to 10~15Mpa supercriticality, is then cooled down by condenser (6) To 35~40 DEG C, supercritical CO2By choke valve, (7 throttling expansions, pressure is down to 1.5~2MPa, and temperature is down to -25 DEG C, CO2Hair First portion liquefies；CO after liquefaction2Separated by knockout drum (8), then boost to 2.5MPa by booster (9), obtain To the liquid CO of supercooling2, and it is pressed into liquid CO2Storage tank (10) is stored；It is not liquefied that knockout drum (8) is separated Low temperature CO2Gas passes through low temperature dehumidification device (2), and CO is surveyed to heat2Gas carries out cool-down dehumidification, then through the 2nd CO2Compressor (11) The overcritical of 10~15MPa is compressed to, with the first CO2The supercritical CO of compressor (5) outlet2Enter condenser (6) after mixing, Then throttling expansion liquefaction is carried out.
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