CN116146451A - CO (carbon monoxide) 2 Transcritical coupling circulation system and working method thereof - Google Patents

CO (carbon monoxide) 2 Transcritical coupling circulation system and working method thereof Download PDF

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Publication number
CN116146451A
CN116146451A CN202211630112.6A CN202211630112A CN116146451A CN 116146451 A CN116146451 A CN 116146451A CN 202211630112 A CN202211630112 A CN 202211630112A CN 116146451 A CN116146451 A CN 116146451A
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China
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working medium
precompressor
circulation system
transcritical
waste heat
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CN202211630112.6A
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Chinese (zh)
Inventor
廖健鑫
田瑞青
张粉
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DEC Dongfang Turbine Co Ltd
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DEC Dongfang Turbine Co Ltd
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Priority to CN202211630112.6A priority Critical patent/CN116146451A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F02G1/055—Heaters or coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/18—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use for specific elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/06—Combinations of two or more pumps

Abstract

The invention discloses a CO 2 Transcritical coupling circulation system and working method thereof, belonging to power generation and power technology deviceA field; the system includes CO 2 System and CO 2 Waste heat utilization system with system matched coupling, and CO 2 The system comprises a re-compression circulation system, a low-pressure turbine is arranged at the rear end of a high-pressure turbine of the re-compression circulation system, a precompressor is further arranged at the air inlet end of the re-compression circulation system, and a waste heat utilization system is further arranged at the air outlet of the precompressor; the invention can effectively improve the circulation efficiency of the system by further optimizing the design on the basis of the traditional recompression circulation system, and can be further coupled with a waste heat utilization system on the basis of the improvement of the structure, even the waste heat utilization system can be a heat user, which fully utilizes the waste heat, realizes the utilization rate of energy consumption and reduces the loss, thereby further improving the utilization of resources.

Description

CO (carbon monoxide) 2 Transcritical coupling circulation system and working method thereof
Technical Field
The invention relates to a CO 2 A transcritical coupling circulation system and a working method thereof belong to the technical device field of power generation and power.
Background
Transcritical CO 2 Closed cycle refers to CO 2 As a circulating working medium, the highest parameter of the circulation is CO 2 Is above the critical point of the above is a supercritical state; the lowest parameter of the cycle is CO 2 Below the critical point, is in a gaseous state. Due to CO 2 Is easily compressed near the critical point, and the CO is generally cooled by a cooler 2 Pressurizing to the vicinity of a critical point through a precompressor after the temperature is reduced; passing the CO through a precooler 2 The temperature is reduced to a critical point; then the design parameters are achieved after the compression of the main compressor; after passing through a heat regenerator, a heater and the like, the temperature reaches the design temperature; the working medium pushes the turbine to do work, so that the external output is realized. Because the outlet temperature of the precompressor is higher, the heat at the outlet of the precompressor can be recovered through coupling with an organic Rankine cycle and a Stirling cycle, so that the power generation efficiency of the system is improved. If heating is needed, the system can supply heat to the outside through recovering waste heat.
Disclosure of Invention
The invention aims at: in order to solve the problems, a CO is provided 2 And the transcritical coupling circulation system realizes the high efficiency of the circulation system by recovering the waste heat of the precompressor.
The technical scheme adopted by the invention is as follows:
CO (carbon monoxide) 2 Transcritical coupled circulation system comprising CO 2 System and CO 2 The system is matched with a coupled waste heat utilization system;
the CO 2 The system comprises a re-compression circulation system, wherein a low-pressure turbine is arranged at the rear end of a high-pressure turbine of the re-compression circulation system, a precompressor is further arranged at the air inlet end of the re-compression circulation system, a waste heat utilization system is further arranged at the air outlet of the precompressor, and the waste heat utilization system is used as air inlet of the re-compression circulation system after passing through the waste heat utilization system.
Further, the recompression circulating system comprises a main compressor, a recompression machine, a high-pressure turbine, a precooler, a low-temperature heat regenerator, a high-temperature heat regenerator and a heat source.
Further, an air inlet of the precooler is communicated with an air outlet of the precompressor through a waste heat utilization system, and the precooler, the main compressor, the low-temperature heat regenerator, the high-temperature heat regenerator, the heat source, the high-pressure turbine and the low-pressure turbine are sequentially connected in series;
the air inlet of the recompression is communicated with the air outlet of the precompressor through the waste heat utilization system, and the air outlet of the recompression is communicated with the air inlet of the high-temperature heat regenerator;
the low-pressure turbine is sequentially connected with the high-temperature heat regenerator and the low-temperature heat regenerator in series to the precompressor.
Further, the waste heat utilization system is an organic Rankine cycle system or a Stirling cycle system.
Further, the waste heat utilization system is an organic Rankine cycle system;
the organic Rankine cycle system comprises a circulating expander, an evaporator, a working medium pump and a condenser which are sequentially communicated, wherein an air inlet of the condenser is communicated to an air outlet of the circulating expander, an air outlet of the precompressor is communicated to an air inlet of the evaporator, and the working medium is sent out through the air outlet of the evaporator.
Further, a reheater is arranged between the high-pressure turbine and the low-pressure turbine.
Further, the waste heat utilization system is a Stirling cycle system;
the Stirling cycle system comprises a hot cylinder, a cold cylinder, a heat regenerator, a heat exchanger and a cooler, wherein a heat source of the heat exchanger is derived from the air outlet of the precompressor, the heated medium outflow end of the heat exchanger is communicated with the hot cylinder, and the medium inflow end of the heat exchanger is sequentially connected with the heat regenerator, the cooler and the cold cylinder in series.
CO (carbon monoxide) 2 The working method of the transcritical coupling circulation system adopts the CO 2 A transcritical coupling circulation system comprising the steps of:
the precompressor performs waste heat utilization on the compressed working medium through a waste heat utilization system, then enters a recompression circulation system in two paths, wherein one path enters a main compressor after being cooled to the vicinity of a critical point through a precooler, and then passes through a low-temperature heat regenerator after being pressurized to a design pressure; the other path directly enters a recompressor, and is mixed with working medium at the outlet of the low-temperature heat regenerator after being pressurized to the design pressure; the mixed working medium sequentially enters a high-temperature heat regenerator and a heat source and then enters a high-pressure turbine to do work; the working medium at the outlet of the high-pressure turbine is further expanded to do work through the low-pressure turbine;
the pressure of the working medium after the expansion of the low-pressure turbine is far lower than that of CO after passing through the high-temperature heat regenerator and the low-temperature heat regenerator 2 And the pressure of the critical point is increased by a precompressor, so that the pressure of the working medium reaches the vicinity of the critical point.
Further, when the waste heat utilization system is an organic Rankine cycle system, heat at the outlet of the precompressor is transferred to an organic working medium through an evaporator, the working medium outputs shaft work to the outside through an expander, the expanded working medium enters a condenser to be condensed into liquid state, enters a working medium pump to be pressurized to target pressure, then enters the evaporator to be absorbed and evaporated into gas state, and the next cycle is started.
Further, when the waste heat utilization system is a Stirling cycle system, the heat is absorbed from the outlet of the precompressor of the heat exchanger to heat the working medium, the working medium enters the hot cylinder to push the piston to do work outwards, the expanded working medium passes through the heat regenerator to store heat in the heat regenerator, then enters the cold cylinder after reaching a preset temperature through the cooler, is compressed through the working medium of the piston team, the compressed working medium passes through the heat regenerator again, the temperature of the working medium is raised through the stored heat, and the next cycle is started after the working medium is continuously heated through the heater.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. CO of the invention 2 The transcritical coupling circulation system and the working method thereof can effectively improve the circulation efficiency of the system by further optimizing the design on the basis of the traditional recompression circulation system, and can further couple a waste heat utilization system on the basis of the structural improvement, even the waste heat utilization system can be a heat user, which fully utilizes the waste heat, realizes the utilization rate of energy consumption and reduces the loss, thereby further improving the utilization of resources;
2. CO of the invention 2 The transcritical coupling circulation system and the working method thereof adopt the modularized design on the structural design of the whole system, so that the structure of the whole system is clearer and simpler, and the switching of the modules can be realized rapidly and effectively when the optimization or the change is carried out on part of the modules of the system.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is CO 2 A transcritical circulation system is coupled to the organic Rankine circulation system diagram;
FIG. 2 is CO 2 A transcritical circulatory system coupled Stirling circulatory system schematic;
FIG. 3 is a schematic diagram of the structure of a recompression cycle;
FIG. 4 is CO 2 The transcritical cycle system is coupled to an organic rankine cycle system diagram (without reheat).
The marks in the figure: A-CO 2 System, B-organic Rankine cycle system, C-Stirling cycle system, D-recompression cycle system, 1-precompressor, 2-main compressor, 3-recompressor, 4-The device comprises a high-pressure turbine, a 4' -low-pressure turbine, a 5-precooler, a 6-low-temperature heat regenerator, a 7-high-temperature heat regenerator, an 8-heat source, a 9-reheater, an I-circulating expander, a II-working medium pump, a III-condenser, an IV-evaporator, an a-hot cylinder, a b-cold cylinder, a c-heat regenerator, a d-heat exchanger and an e-cooler.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Example 1
CO (carbon monoxide) 2 Transcritical coupling circulation system, as shown in FIGS. 1-4, includes CO 2 System A and CO 2 System A (CO) 2 A transcritical circulation system) is matched with the coupled waste heat utilization system;
the CO 2 The system A comprises a recompression circulating system D, a low-pressure turbine 4' is arranged at the rear end of a high-pressure turbine 4 of the recompression circulating system D, a precompressor 1 is further arranged at the air inlet end of the recompression circulating system, a waste heat utilization system is further arranged at the air outlet of the precompressor 1, and the waste heat utilization system is used as air inlet of the recompression circulating system D after passing through the waste heat utilization system.
In this embodiment, as a specific design, on the basis of the recompression circulation system, the structural designs of the precompressor 1 and the low-pressure turbine 4' arranged at the rear end are further increased, which is mainly used for realizing the coupling of the waste heat utilization system, and simultaneously, the working efficiency and the circulation efficiency are further improved, so that the waste heat reutilization and the circulation effect of the whole system are effectively realized. In addition, in the design of the waste heat utilization system, not only other systems for heat energy consumption, but also heat supply to heat utilization users can be realized, so that the waste heat is better utilized.
Based on the above specific design, the recompression circulation system comprises a main compressor 2, a recompression 3, a high pressure turbine 4, a precooler 5, a low temperature regenerator 6, a high temperature regenerator 7 and a heat source 8 as shown in fig. 3.
Based on the design of the specific structure, the air inlet of the precooler 5 is communicated with the air outlet of the precompressor 1 through a waste heat utilization system, and the precooler 5, the main compressor 2, the low-temperature heat regenerator 6, the high-temperature heat regenerator 7, the heat source 8, the high-pressure turbine 4 and the low-pressure turbine 4' are sequentially connected in series;
the air inlet of the recompression machine 3 is communicated with the air outlet of the precompressor 1 through a waste heat utilization system, and the air outlet of the recompression machine 3 is communicated with the air inlet of the high-temperature heat regenerator 7;
the low-pressure turbine 4' is sequentially connected with the high-temperature heat regenerator 7 and the low-temperature heat regenerator 6 in series to the precompressor 1.
Based on the design of the specific structure, the gas flow direction and the circulation path are further controlled in the connection relation.
Based on the design of the specific structure, the waste heat utilization system is an organic Rankine cycle system B or a Stirling cycle system C.
In this embodiment, as a specific explanation, as shown in fig. 4, the waste heat utilization system is an organic rankine cycle system B; the organic Rankine cycle system B comprises a circulating expander I, an evaporator IV, a working medium pump II and a condenser III which are sequentially communicated, wherein an air inlet of the condenser III is communicated to an air outlet of the circulating expander I, and an air outlet of the precompressor 1 is communicated to an air inlet of the evaporator IV and sends out working medium through an air outlet of the evaporator IV.
Further, as shown in fig. 1, a reheater 9 is provided between the high pressure turbine 4 and the low pressure turbine 4'.
Example 2
On the basis of the design of embodiment 1, unlike embodiment 1, as shown in fig. 2, the waste heat utilization system is a stirling cycle system C;
the Stirling cycle system C comprises a hot cylinder a, a cold cylinder b, a heat regenerator C, a heat exchanger d and a cooler e, wherein a heat source 8 of the heat exchanger d is derived from the air outlet of the precompressor 1, a heated medium outflow end of the heat exchanger d is communicated with the hot cylinder a, and a medium inflow end of the heat exchanger d is sequentially connected with the heat regenerator, the cooler e and the cold cylinder b in series.
Example 3
On the basis of the structural design of the embodiment 1 and the embodiment 2, the working principle of the CO is further explained, namely the CO is formed by the following steps of 2 The working method of the transcritical coupling circulation system comprises the following steps:
the precompressor 1 utilizes the waste heat of the compressed working medium through a waste heat utilization system, then enters a recompression circulating system D in two paths, wherein one path enters a main compressor 2 after being cooled to the vicinity of a critical point through a precooler 5, and then passes through a low-temperature heat regenerator 6 after being pressurized to the design pressure; the other path directly enters the recompression machine 3, and is mixed with working medium at the outlet of the low-temperature heat regenerator 6 after being pressurized to the design pressure; the mixed working medium sequentially enters a high-temperature heat regenerator 7 and a heat source 8 and then enters a high-pressure turbine 4 to do work; the working medium at the outlet of the high-pressure turbine 4 is further expanded and works through the low-pressure turbine 4';
the pressure of the working medium expanded by the low-pressure turbine 4' is far lower than that of CO after passing through the high-temperature heat regenerator 7 and the low-temperature heat regenerator 6 2 The working medium is pressurized by the precompressor 1 to make the pressure reach the critical point.
Based on the specific design, more specifically: when the waste heat utilization system is an organic Rankine cycle system B, heat at the outlet of the precompressor 1 is transmitted to an organic working medium through an evaporator IV, the working medium outputs shaft work to the outside through an expander, the expanded working medium enters a condenser III to be condensed into liquid state, enters a working medium pump II to be pressurized to target pressure, then enters the evaporator IV to be absorbed and evaporated into gas state, and the next cycle is started.
When the waste heat utilization system is a Stirling cycle system C, the heat is absorbed by the heat exchanger d from the outlet of the precompressor 1 to heat the working medium, the working medium enters the hot cylinder a to push the piston to do work outwards, the expanded working medium passes through the heat regenerator to store heat in the heat regenerator C, then enters the cold cylinder b after reaching a preset temperature through the cooler e, the working medium is compressed through the piston team, the compressed working medium passes through the heat regenerator again, the temperature of the working medium is increased through the stored heat, and the working medium continues to be heated through the heater to start the next cycle.
To sum up:
1. CO of the invention 2 The transcritical coupling circulation system and the working method thereof can effectively improve the circulation efficiency of the system by further optimizing the design on the basis of the traditional recompression circulation system, and can further couple a waste heat utilization system on the basis of the structural improvement, even the waste heat utilization system can be a heat user, which fully utilizes the waste heat, realizes the utilization rate of energy consumption and reduces the loss, thereby further improving the utilization of resources;
2. CO of the invention 2 The transcritical coupling circulation system and the working method thereof adopt the modularized design on the structural design of the whole system, so that the structure of the whole system is clearer and simpler, and the switching of the modules can be realized rapidly and effectively when the optimization or the change is carried out on part of the modules of the system.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.

Claims (10)

1. CO (carbon monoxide) 2 The transcritical coupling circulation system is characterized in that: comprising CO 2 System and CO 2 The system is matched with a coupled waste heat utilization system;
the CO 2 The system comprises a re-compression circulation system, a low-pressure turbine is arranged at the rear end of a high-pressure turbine of the re-compression circulation system, a precompressor is also arranged at the air inlet end of the re-compression circulation system, a waste heat utilization system is also arranged at the air outlet of the precompressor, and the waste heat utilization system is used for recycling waste heatAnd then serves as the intake air for the re-compression cycle.
2. A CO according to claim 1 2 The transcritical coupling circulation system is characterized in that: the recompression circulating system comprises a main compressor, a recompression machine, a high-pressure turbine, a precooler, a low-temperature heat regenerator, a high-temperature heat regenerator and a heat source.
3. A CO according to claim 2 2 The transcritical coupling circulation system is characterized in that: the air inlet of the precooler is communicated with the air outlet of the precompressor through a waste heat utilization system, and the precooler, the main compressor, the low-temperature heat regenerator, the high-temperature heat regenerator, the heat source, the high-pressure turbine and the low-pressure turbine are sequentially connected in series;
the air inlet of the recompression is communicated with the air outlet of the precompressor through the waste heat utilization system, and the air outlet of the recompression is communicated with the air inlet of the high-temperature heat regenerator;
the low-pressure turbine is sequentially connected with the high-temperature heat regenerator and the low-temperature heat regenerator in series to the precompressor.
4. A CO according to claim 1 2 The transcritical coupling circulation system is characterized in that: the waste heat utilization system is an organic Rankine cycle system or a Stirling cycle system.
5. A CO as in claim 4 2 The transcritical coupling circulation system is characterized in that: the waste heat utilization system is an organic Rankine cycle system;
the organic Rankine cycle system comprises a circulating expander, an evaporator, a working medium pump and a condenser which are sequentially communicated, wherein an air inlet of the condenser is communicated to an air outlet of the circulating expander, an air outlet of the precompressor is communicated to an air inlet of the evaporator, and the working medium is sent out through the air outlet of the evaporator.
6. A CO as in claim 5 2 The transcritical coupling circulation system is characterized in that: at the position ofAnd a reheater is arranged between the high-pressure turbine and the low-pressure turbine.
7. A CO as in claim 4 2 The transcritical coupling circulation system is characterized in that: the waste heat utilization system is a Stirling cycle system;
the Stirling cycle system comprises a hot cylinder, a cold cylinder, a heat regenerator, a heat exchanger and a cooler, wherein a heat source of the heat exchanger is derived from the air outlet of the precompressor, the heated medium outflow end of the heat exchanger is communicated with the hot cylinder, and the medium inflow end of the heat exchanger is sequentially connected with the heat regenerator, the cooler and the cold cylinder in series.
8. CO (carbon monoxide) 2 Working method of transcritical coupling circulation system using a CO as set forth in any one of claims 1 to 6 2 The transcritical coupling circulation system is characterized in that: the method comprises the following steps:
the precompressor performs waste heat utilization on the compressed working medium through a waste heat utilization system, then enters a recompression circulation system in two paths, wherein one path enters a main compressor after being cooled to the vicinity of a critical point through a precooler, and then passes through a low-temperature heat regenerator after being pressurized to a design pressure; the other path directly enters a recompressor, and is mixed with working medium at the outlet of the low-temperature heat regenerator after being pressurized to the design pressure; the mixed working medium sequentially enters a high-temperature heat regenerator and a heat source and then enters a high-pressure turbine to do work; the working medium at the outlet of the high-pressure turbine is further expanded to do work through the low-pressure turbine;
the pressure of the working medium after the expansion of the low-pressure turbine is far lower than that of CO after passing through the high-temperature heat regenerator and the low-temperature heat regenerator 2 And the pressure of the critical point is increased by a precompressor, so that the pressure of the working medium reaches the vicinity of the critical point.
9. A CO according to claim 8 2 The working method of the transcritical coupling circulation system is characterized in that: when the waste heat utilization system is an organic Rankine cycle system, heat at the outlet of the precompressor is transferred to an organic working medium through an evaporator, the working medium outputs shaft work to the outside through an expander, and the expanded working medium is subjected to expansionThe working medium enters a condenser to be condensed into liquid state, enters a working medium pump to be pressurized to target pressure, then enters an evaporator to be absorbed and evaporated into gas state, and starts the next cycle.
10. A CO according to claim 8 2 The working method of the transcritical coupling circulation system is characterized in that: when the waste heat utilization system is a Stirling cycle system, the heat is absorbed by an outlet of the precompressor from the heat exchanger to heat the working medium, the working medium enters the hot cylinder to push the piston to do work outwards, the expanded working medium further passes through the heat regenerator to store heat in the heat regenerator, then enters the cold cylinder after reaching a preset temperature through the cooler, is compressed through the working medium of the piston team, the compressed working medium further passes through the heat regenerator to heat the working medium again, and the working medium is heated continuously through the heater to start the next cycle.
CN202211630112.6A 2022-12-19 2022-12-19 CO (carbon monoxide) 2 Transcritical coupling circulation system and working method thereof Pending CN116146451A (en)

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