CN115025512A - Switching type CO 2 Desublimation separation system - Google Patents
Switching type CO 2 Desublimation separation system Download PDFInfo
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- CN115025512A CN115025512A CN202210562346.5A CN202210562346A CN115025512A CN 115025512 A CN115025512 A CN 115025512A CN 202210562346 A CN202210562346 A CN 202210562346A CN 115025512 A CN115025512 A CN 115025512A
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- heat exchanger
- switching valve
- desublimation
- sublimation
- precooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D7/00—Sublimation
- B01D7/02—Crystallisation directly from the vapour phase
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D7/00—Sublimation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- 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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/32—Direct CO2 mitigation
Abstract
The invention discloses a switching type CO 2 The desublimation separation system comprises a flue gas flow path and a cooling module; the flue gas flow path comprises a desublimation flow path and a sublimation flow path; the desublimation flow path comprises a dehumidification device, a gas supercharger, a first switching valve, an inlet of a sublimation heat exchanger a, an outlet of the sublimation heat exchanger a, a second switching valve, a first precooling heat exchange channel of a precooling heat exchanger, a third switching valve, a desublimation heat exchanger, a fourth switching valve and a second precooling heat exchange channel of the precooling heat exchanger which are sequentially communicated; the sublimation flow path comprises an outlet of the sublimation heat exchanger d, a fifth switching valve, a compressor, a water cooling device and liquid CO which are sequentially communicated 2 And (4) storage tank. The invention combines CO 2 The desublimation characteristic and switching separation method are adopted to remove CO in low-concentration low-pressure flue gas by adopting a low-temperature desublimation method 2 Performing high-efficiency separation by using solid CO 2 The cold energy carries out preliminary precooling to the incoming flow flue gas, uses clean flue gas cold energy to precool the incoming flow flue gas once more, further reduces the energy consumption, reaches energy-conserving purpose.
Description
Technical Field
The invention relates to CO 2 The field of separation, in particular to a switching CO 2 A desublimation separation system.
Background
Thermal power generation is still one of the important ways to meet its energy needs in many countries today. Traditional thermal power generation relies on combustion of coal, natural gas, biomass and other fuels with air, and the product flue gas mainly comprises CO 2 、N 2 And H 2 0. Among all carbon emission sources, coal fired power plants contributed global CO in 2012 2 42% of the discharge amount. In recent years, for CO 2 The exploration of the separation mode is never stopped, and the separation mode is mainly divided into a separation technology before combustion, an oxygen-enriched combustion technology and a separation technology after combustion, wherein the separation technology after combustion is relatively widely applied.
Low temperature CO 2 The separation technology belongs to one of the separation technologies after combustion. Research indicates that CO is at low temperature 2 The separation is a 30% saving in energy consumption compared to other methods, however, since long since CO is present 2 The problem of blockage caused by desublimation is difficult to solve, and low-temperature CO 2 The separation is mainly concentrated on CO 2 The principle of the liquefaction separation is to realize CO according to the different melting points of different components in the mixed gas 2 Separation of (4). CO2 2 The critical temperature is 304.1K, the critical pressure is 7.377MPa, the triple point temperature is 216.55K, and the triple point pressure is 0.518 MPa. For CO 2 Gases with contents above their triple point pressure are suitable in principle for gas-liquid separation by cooling and partial condensation; and for CO 2 When the flue gas with the content lower than the triple point pressure is subjected to low-temperature separation, the flue gas needs to be compressed, the initial pressure is increased to be higher than the triple point, so that the flue gas enters a liquefiable state, multi-stage compression is often needed in the process, the construction cost and the separation energy consumption are increased to a great extent, the early-stage investment is large, and the operation cost is high.
Theoretical analysis shows that low temperature CO is used 2 During liquefaction separation, CO is continuously separated 2 The partial pressure of (A) is continuously reduced and the separation difficulty is continuously increased, thereby causing CO 2 The separation rate is low. When the smoke pressure is increased, although CO can be increased 2 The separation rate, but the purity thereof, decreases with increasing pressure, while the energy consumption increases. Thus low temperature CO 2 Separation of unsuitable CO by liquefaction 2 Flue gas with lower concentration.
Using low temperature CO 2 The desublimation separation can obviously improve CO 2 Purity and separation rate. For example, chinese patent publication No. CN101854990A discloses a method for separating CO from a gaseous feed stream 2 Method of using 3 separate fixed beds for CO moving through the bed 2 In the 1 st, 2 nd and 3 rd beds respectively to realize CO 2 The use of pre-cooled porous bodies in the separation stage with limited cold storage results in a process with limited CO separation during a cycle 2 And the moving energy consumption of the bed layer is high.
Chinese patent publication No. CN113975938A discloses a rotary low-temperature device and method for adsorbing and capturing carbon dioxide in flue gas, which carry out CO adsorption, desorption and cooling by continuous rotation of an integral adsorption bed 2 The separation is carried out, but the structure is more complex, the requirement on waste heat is high, and the energy consumption required by the continuous rotation of the adsorption bed is high.
Therefore, in order to solve the problems of small treatment amount, high energy consumption and the like in the prior art, a novel CO needs to be explored 2 And (4) separating the system.
Disclosure of Invention
The invention provides a switching CO 2 Desublimation separation system from mainly containing CO 2 、N 2 And H 2 0 separation of CO from flue gas 2 (ii) a The desublimation of CO2 is realized at normal pressure at low temperature, and heat exchange is carried out by using hot flue gas to ensure that CO is condensed 2 Output after sublimation, thereby realizing CO 2 The separation of (2) and precooling of the incoming flow flue gas, thereby saving cold energy and reducing energy consumption.
Switching type CO 2 The desublimation separation system comprises a dehumidifier, a gas supercharger, a cooling module, a precooling heat exchanger, a sublimation heat exchanger, a desublimation heat exchanger, a compressor, a water cooling device and liquid CO 2 A storage tank;
the precooling heat exchanger comprises a first precooling heat exchange channel and a second precooling heat exchange channel; the sublimation heat exchanger and the desublimation heat exchanger have the same structure and respectively comprise a first heat exchange channel and a second heat exchange channel, wherein the first heat exchange channel comprises an inlet a, an inlet b, an outlet a and an outlet b which correspond to the inlet a and the outlet b, and the second heat exchange channel comprises an inlet c, an outlet c and an outlet d which correspond to the outlet c and the outlet d;
the dehumidification device is sequentially connected with the gas booster and the first switching valve, and the other two interfaces of the first switching valve are respectively connected with the two inlets a;
the two outlets a are respectively connected with two interfaces of a second switching valve, the other interface of the second switching valve is sequentially connected with a first precooling heat exchange channel and a third switching valve, and the other two interfaces of the third switching valve are respectively connected with two inlets c; the two outlets c are respectively connected with two interfaces of a fourth switching valve, and the other interface of the fourth switching valve is connected with a second precooling heat exchange channel; two d outlets are respectively connected with two interfaces of a fifth switching valve, and the other interface of the fifth switching valve is sequentially connected with a compressor, a water cooling device and liquid CO 2 A storage tank;
the output end and the input end of the cooling module are respectively connected with one interface of the sixth switching valve and one interface of the seventh switching valve, the other two interfaces of the sixth switching valve are respectively connected with the two b inlets, and the other two interfaces of the seventh switching valve are respectively connected with the two b outlets.
Further, the sublimation heat exchanger and the desublimation heat exchanger realize the conversion of sublimation and desublimation functions under the control of all switching valves;
when the sublimation heat exchanger has a sublimation function and the desublimation heat exchanger has a desublimation function; the first switching valve is opened to the first heat exchanger and closed to the second heat exchanger; the second switching valve opens a passage to the first heat exchanger and closes a passage to the second heat exchanger; the third switching valve is opened to the second heat exchanger and closed to the first heat exchanger; the fourth switching valve is closed to the passage from the first heat exchanger and opened to the passage from the second heat exchanger; the fifth switching valve and the second switching valve are kept consistent; the sixth switching valve and the third switching valve are kept consistent; the seventh switching valve and the fourth switching valve are kept consistent;
when all the switching valves are reversed, the sublimation heat exchanger is converted into a desublimation function, and the desublimation heat exchanger is converted into a sublimation function.
Further, when the sublimation heat exchanger has a sublimation function and the desublimation heat exchanger has a desublimation function; the desublimation flow path comprises a dehumidification device, a gas supercharger, a first switching valve, an inlet a of a sublimation heat exchanger, an outlet a of the sublimation heat exchanger, a second switching valve, a first precooling heat exchange channel of a precooling heat exchanger, a third switching valve, a desublimation heat exchanger, a fourth switching valve and a second precooling heat exchange channel of the precooling heat exchanger which are sequentially communicated;
the sublimation flow path comprises an outlet d of the sublimation heat exchanger, a fifth switching valve, a compressor, a water cooling device and liquid CO which are sequentially communicated 2 And (4) storing the liquid.
Alternatively, all switching valves may take the form of manual switching valves, solenoid switching valves or other.
Further, the flue gas to be treated enters the system through a dehumidifying device, and separated CO 2 Into liquid CO 2 And (4) sealing the storage tank, and discharging the residual clean flue gas after passing through a second precooling heat exchange channel of the precooling heat exchanger.
Further, the flue gas contains all CO-containing gas generated by a coal-fired power plant or a gas-fired power plant 2 The flue gas of (2).
Alternatively, the pre-cooling heat exchanger, the sublimation heat exchanger and the desublimation heat exchanger adopt a dividing wall type, a double-pipe type heat exchanger or any other form, and any fins such as straight fins, pin fins and the like can be added.
Optionally, the cooling module comprises a refrigeration unit and a circulation flow path, or an external cold source (such as LNG waste cold) is used.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention obviously reduces the power consumption caused by multi-stage compression and simultaneously improves CO 2 Purity of separation and separation rate. Using solid CO 2 And the clean flue gas carries out two-step precooling on the incoming flow flue gas, thereby reducing the energy consumption. If it is usedThe existence of a recyclable external cold source (such as LNG cold energy) and low-temperature desublimation CO 2 The separation method can almost realize zero energy consumption and has incomparable advantages compared with the liquefaction separation method.
(2) The invention adopts two desublimation or sublimation heat exchangers to process CO in the flue gas 2 The switching separation can be carried out according to the flow rate of the treated flue gas and CO 2 The area of the heat exchanger is flexibly adjusted in the early stage according to different concentrations, so that the requirement of CO in the high-flow low-pressure low-concentration flue gas is met 2 Separation requirements.
(3) The invention removes and separates CO 2 In addition, high concentrations of N are produced 2 Byproducts, and reduces the operation cost.
Drawings
FIG. 1 is a schematic diagram of a switched CO according to an embodiment of the present invention 2 The whole structure schematic diagram of the desublimation separation system;
FIG. 2 is a schematic diagram of a switching CO according to an embodiment of the present invention 2 A schematic diagram of a first mode of the desublimation separation system;
FIG. 3 is a schematic diagram of a switching CO according to an embodiment of the present invention 2 A second mode schematic of the desublimation separation system.
In the figure: 1. a dehumidifying device, 2, a gas booster, 3, a first switching valve, 4, a sublimation heat exchanger, 5, a second switching valve, 6, a precooling heat exchanger, 7, a third switching valve, 8, a desublimation heat exchanger, 9, a fourth switching valve, 10, a fifth switching valve, 11, a compressor, 12, a water cooling device, 13, liquid CO 2 A storage tank, 14, a cooling module, 15, a sixth switching valve, 16 and a seventh switching valve.
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples, which are intended to facilitate the understanding of the invention without limiting it in any way.
As shown in fig. 1, a switching type CO 2 The desublimation separation system comprises a dehumidifying device 1, a gas supercharger 2, a cooling module 14, a precooling heat exchanger 6, a sublimation heat exchanger 4, a desublimation heat exchanger 8, a compressor 11, a water cooling device 12 and a liquid CO2 storage tank 13.
The precooling heat exchanger 6 comprises a first precooling heat exchange channel and a second precooling heat exchange channel; sublimation heat exchanger 4 is the same with structure of desublimation heat exchanger 8, all includes first heat transfer passageway and second heat transfer passageway, and first heat transfer passageway contains a import, b import and the export of a, b that correspond, and second heat transfer passageway contains c import and the export of c, d that correspond.
The dehumidifier 1 is connected with the gas booster 2 and the first switching valve 3 in sequence, and the other two interfaces of the first switching valve 3 are respectively connected with the two inlets a; the two a outlets are respectively connected with two interfaces of the second switching valve 5, the other interface of the second switching valve 5 is sequentially connected with the first precooling heat exchange channel and the third switching valve 7, and the other two interfaces of the third switching valve 7 are respectively connected with the two c inlets; the two outlets c are respectively connected with two interfaces of the fourth switching valve 9, and the other interface of the fourth switching valve 9 is connected with the second precooling heat exchange channel; the two outlets d are respectively connected with two ports of the fifth switching valve 10, and the other port of the fifth switching valve 10 is sequentially connected with the compressor 11, the water cooling device 12 and the liquid CO2 storage tank 13. The output end and the input end of the cooling module 14 are respectively connected with one interface of a sixth switching valve 15 and one interface of a seventh switching valve 16, the other two interfaces of the sixth switching valve 15 are respectively connected with two b inlets, and the other two interfaces of the seventh switching valve 16 are respectively connected with two b outlets.
The invention is suitable for CO in low-pressure low-concentration flue gas 2 The system comprises a flue gas flow path and a cooling module, the flue gas flow path comprises CO 2 Desublimated flow path and CO 2 A sublimation flow path.
The sublimation heat exchanger 4 and the desublimation heat exchanger 8 can realize the conversion of sublimation and desublimation modes under the control of all switching valves.
The working process is as follows: the flue gas enters the dehumidifying device 1, enters the gas booster 2 after water removal, and is slightly boosted, so that the resistance of subsequent pipelines and equipment can be overcome. Then enters a sublimation heat exchanger 4 through a first switching valve 3 for first-step precooling and is solid CO 2 Heat is provided by sublimation; solid CO 2 Sublimating, leaving the sublimation heat exchanger 4, treating by a compressor 11 and a water cooling device 12, and introducing into liquid CO 2 Sealing the storage tank 13; the flue gas of the incoming flow enters a precooling heat exchanger 6 through a second switching valve 5, is precooled again through the precooling heat exchanger and then enters a desublimation heat exchanger 8 through a third switching valve 7; the refrigerant provides cold energy for the desublimation heat exchanger 8 through a sixth switching valve 15 and a seventh switching valve 16, and CO in the smoke gas 2 Is coagulated and sublimated into solid in the desublimation heat exchanger 8; the clean flue gas leaves the desublimation heat exchanger 8, enters the precooling heat exchanger 6 through the fourth switching valve 9, exchanges heat with the incoming flow flue gas, is discharged after utilizing the residual cold quantity, and completes the primary CO 2 Desublimation separation (this mode is defined as the first mode, the flow path of which is shown in FIG. 2). All the switching valves are reversed, the functions of the sublimation heat exchanger 4 and the desublimation heat exchanger 8 are switched, and next separation is carried out (the mode is defined as a second mode, and the flow path is shown in figure 3).
In the first mode, the first switching valve 3 is opened to the first heat exchanger 4 and closed to the second heat exchanger 8; the second switching valve 5 opens to the passage from the first heat exchanger 4 and closes to the passage from the second heat exchanger 8; the third switching valve 7 is opened to the second heat exchanger 8 and closed to the first heat exchanger 4; the fourth switching valve 9 closes the passage to the first heat exchanger 4 and opens the passage to the second heat exchanger 8; the fifth switching valve 10 and the second switching valve 5 are kept consistent; the sixth switching valve 15 and the third switching valve 7 are kept consistent; the seventh switching valve 16 and the fourth switching valve 9 are kept in agreement.
In this mode, CO 2 The desublimation flow path comprises a dehumidifying device 1, a gas supercharger 2, a first switching valve 3, an inlet a of a sublimation heat exchanger 4, an outlet a of the sublimation heat exchanger 4, a second switching valve 5, a first precooling heat exchange channel of a precooling heat exchanger 6, a third switching valve 7, a desublimation heat exchanger 8, a fourth switching valve 9 and a second precooling heat exchange channel of the precooling heat exchanger 6 which are communicated in sequence;
CO 2 the sublimation flow path comprises an outlet d of the sublimation heat exchanger 4, a fifth switching valve 10, a compressor 11, a water cooling device 12 and liquid CO which are sequentially communicated 2 A tank 13.
The cooling module 14 is connected with the desublimation heat exchanger 8 through a sixth switching valve 15 and a seventh switching valve 16 to provide cooling capacity for the desublimation heat exchanger.
In the embodiment of the invention, a proper heat insulation mode, such as stacking heat insulation, vacuum powder and fiber heat insulation, high-vacuum multilayer heat insulation and the like, is used to achieve a better heat insulation effect.
The gas booster adopts a piston structure and is used for slightly boosting the incoming flow of flue gas, so that the resistance of pipelines and equipment can be overcome. The switching valve is used for controlling the flow direction of the fluid and switching the heat exchanger under two modes of desublimation and sublimation. For better overall control, the switching valve can be any form of a manual switching valve, an electromagnetic switching valve and the like according to economic requirements or technical requirements so as to adapt to requirements of different economical efficiency or response speed.
In order to enhance heat exchange and improve heat exchange efficiency and CO 2 The cleanliness and the heat exchanger can be any forms such as a dividing wall type and a sleeve type, and can also be added with any fins such as straight ribs and pin ribs to improve the heat exchange area.
To provide for making CO 2 Sufficient cold for desublimation at normal pressure, preferably, the cooling module comprises a refrigeration unit and a circulation flow path or an external cold source (such as LNG waste cold).
The embodiments described above are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions and equivalents made within the scope of the principles of the present invention should be included in the scope of the present invention.
Claims (8)
1. Switching type CO 2 The desublimation separation system is characterized by comprising a dehumidifying device (1), a gas booster (2), a cooling module (14), a precooling heat exchanger (6), a sublimation heat exchanger (4), a desublimation heat exchanger (8), a compressor (11), a water cooling device (12) and liquid CO 2 A tank (13);
the precooling heat exchanger (6) comprises a first precooling heat exchange channel and a second precooling heat exchange channel; the sublimation heat exchanger (4) and the desublimation heat exchanger (8) are identical in structure and respectively comprise a first heat exchange channel and a second heat exchange channel, the first heat exchange channel comprises an inlet a, an inlet b, an outlet a and an outlet b, which correspond to the inlet a and the outlet b, and the second heat exchange channel comprises an inlet c, an outlet c and an outlet d, which correspond to the outlet c and the outlet d;
the dehumidifier (1) is sequentially connected with the gas booster (2) and the first switching valve (3), and the other two interfaces of the first switching valve (3) are respectively connected with the two inlets a;
the two outlets a are respectively connected with two interfaces of the second switching valve (5), the other interface of the second switching valve (5) is sequentially connected with the first precooling heat exchange channel and the third switching valve (7), and the other two interfaces of the third switching valve (7) are respectively connected with the two inlets c; the two outlets c are respectively connected with two interfaces of a fourth switching valve (9), and the other interface of the fourth switching valve (9) is connected with a second precooling heat exchange channel; two outlets d are respectively connected with two interfaces of a fifth switching valve (10), and the other interface of the fifth switching valve (10) is sequentially connected with a compressor (11), a water cooling device (12) and liquid CO 2 A tank (13);
the output end and the input end of the cooling module (14) are respectively connected with one interface of a sixth switching valve (15) and one interface of a seventh switching valve (16), the other two interfaces of the sixth switching valve (15) are respectively connected with two b inlets, and the other two interfaces of the seventh switching valve (16) are respectively connected with two b outlets.
2. Switched CO according to claim 1 2 The desublimation separation system is characterized in that the sublimation heat exchanger (4) and the desublimation heat exchanger (8) realize the conversion of sublimation and desublimation functions under the control of all switching valves;
when the sublimation heat exchanger (4) has a sublimation function and the desublimation heat exchanger (8) has a desublimation function; the first switching valve (3) is opened to the first heat exchanger (4) and closed to the second heat exchanger (8); the second switching valve (5) is open to the passage from the first heat exchanger (4) and closed to the passage from the second heat exchanger (8); the third switching valve (7) is opened to the second heat exchanger (8) and closed to the first heat exchanger (4); the fourth switching valve (9) is closed to the passage from the first heat exchanger (4) and opened to the passage from the second heat exchanger (8); the fifth switching valve (10) and the second switching valve (5) are kept consistent; the sixth switching valve (15) and the third switching valve (7) are kept consistent; the seventh switching valve (16) and the fourth switching valve (9) are kept consistent;
when all the switching valves are reversed, the sublimation heat exchanger (4) is converted into a desublimation function, and the desublimation heat exchanger (8) is converted into a sublimation function.
3. Switched CO according to claim 2 2 The desublimation separation system is characterized in that when the sublimation heat exchanger (4) has a sublimation function, the desublimation heat exchanger (8) has a desublimation function;
the desublimation flow path comprises a dehumidification device (1), a gas booster (2), a first switching valve (3), an inlet a of a sublimation heat exchanger (4), an outlet a of the sublimation heat exchanger (4), a second switching valve (5), a first precooling heat exchange channel of a precooling heat exchanger (6), a third switching valve (7), a desublimation heat exchanger (8), a fourth switching valve (9) and a second precooling heat exchange channel of the precooling heat exchanger (6) which are communicated in sequence;
the sublimation flow path comprises a d outlet of the sublimation heat exchanger (4), a fifth switching valve (10), a compressor (11), a water cooling device (12) and liquid CO which are communicated in sequence 2 A tank (13).
4. Switched CO according to claim 1 2 The desublimation separation system is characterized in that all the switching valves adopt manual switching valves or electromagnetic switching valves.
5. Switched CO according to claim 1 2 The desublimation separation system is characterized in that flue gas to be treated enters the system through a dehumidifier (1), and separated CO 2 Into liquid CO 2 And the storage tank (13) is sealed, and the residual clean flue gas is discharged after passing through a second precooling heat exchange channel of the precooling heat exchanger (6).
6. Switched CO according to claim 5 2 The desublimation separation system is characterized in that the flue gas contains all CO-containing gas generated by a coal-fired power plant or a gas-fired power plant 2 The flue gas of (1).
7. Switched CO according to claim 1 2 DesublimationThe separation system is characterized in that the precooling heat exchanger (6), the sublimation heat exchanger (4) and the desublimation heat exchanger (8) adopt a dividing wall type or double-pipe type heat exchanger.
8. Switched CO according to claim 1 2 The desublimation separation system is characterized in that the cooling module comprises a refrigerating unit and a circulating flow path, or an external cold source is adopted.
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