CN116733559A - Carbon dioxide-to-brayton combined cooling and power system and method coupled with latent heat of fuel - Google Patents
Carbon dioxide-to-brayton combined cooling and power system and method coupled with latent heat of fuel Download PDFInfo
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- CN116733559A CN116733559A CN202310655918.9A CN202310655918A CN116733559A CN 116733559 A CN116733559 A CN 116733559A CN 202310655918 A CN202310655918 A CN 202310655918A CN 116733559 A CN116733559 A CN 116733559A
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- 239000000446 fuel Substances 0.000 title claims abstract description 351
- 238000001816 cooling Methods 0.000 title claims abstract description 84
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010168 coupling process Methods 0.000 claims abstract description 36
- 230000008878 coupling Effects 0.000 claims abstract description 31
- 238000005859 coupling reaction Methods 0.000 claims abstract description 31
- 239000002828 fuel tank Substances 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 98
- 239000001569 carbon dioxide Substances 0.000 claims description 49
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 49
- 239000002826 coolant Substances 0.000 claims description 19
- 238000002485 combustion reaction Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000009833 condensation Methods 0.000 claims description 14
- 230000005494 condensation Effects 0.000 claims description 14
- 239000011555 saturated liquid Substances 0.000 claims description 13
- 239000012071 phase Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
- 239000013526 supercooled liquid Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000007791 liquid phase Substances 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 8
- 238000007906 compression Methods 0.000 description 7
- 238000010248 power generation Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000004781 supercooling Methods 0.000 description 6
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 4
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- 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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- 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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/12—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engines being mechanically coupled
- F01K23/14—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engines being mechanically coupled including at least one combustion engine
-
- 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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The application discloses a carbon dioxide-to-brayton combined cooling and power system and method for coupling latent heat of fuel, comprising a working medium pump, a preheater, a regenerator, a wall heat exchanger, an expander, a generator, a cooler, a condenser, a compressor, a throttle valve, a fuel pump, a fuel turbine and a fuel storage tank; the number of the condensers is one or two in series; a throttle valve is provided on a line connecting the fuel inlet of the condenser and the fuel outlet of the fuel tank for supplying fuel from the fuel tankThe fuel of the material storage tank is throttled and depressurized, so that the fuel reaches a gas-liquid two-phase state, and the number of throttle valves is consistent with the number of condensers and corresponds to the number of condensers one by one. The application utilizes the latent heat of fuel to convert CO 2 Is reduced to below the critical temperature to build up CO 2 The variable Brayton combined cooling and power system is used for cooling a high-temperature wall surface in the hypersonic aircraft and generating power by utilizing high-temperature heat load.
Description
Technical Field
The application relates to the technical field of wall heat protection, in particular to a carbon dioxide-to-Brayton combined cooling and power system and method for coupling latent heat of fuel.
Background
In the technical field of aircraft heat protection, the fuselage and the engine of an aircraft are heated by a high Wen Lailiu in the flight process to generate a large amount of pneumatic heat, the wall surface is extremely high in temperature under the pneumatic heating effect, the operation of an internal system of the aircraft is seriously influenced, and an efficient wall surface cooling technology needs to be developed.
In addition, long-endurance and reusable technology direction of future aircraft development is an important technical direction, higher requirements are also put on the power generation capacity of the aircraft, and development of an efficient aircraft combined cooling and power system is one of important contents of future aircraft development.
Fuel is currently the only available and limited source of cooling in aircraft. When the fuel is used as a coolant, the upper temperature limit is the problem that coking and carbon deposition are easy to occur when the temperature of the fuel exceeds about 700 ℃, so that the wall cooling channels are blocked, and the cooling effect is weakened. In addition, the fuel is stored at normal temperature in the storage tank, and the storage temperature is generally 293K, so that the sensible heat of the fuel is limited, and when the sensible heat of the fuel is used as a cold source heat sink in an aircraft combined cooling and power system, the fuel flow required for cooling the wall surface gradually increases along with the rise of the wall surface temperature of the aircraft, and even exceeds the fuel flow required for propulsion of the aircraft, so that quality penalty is caused. When the aircraft is in a high temperature environment, the storage temperature of the fuel in the storage tank rises, so that the sensible heat sink of the fuel is further reduced, and even CO cannot be caused 2 Condensation, which results in the problem of difficult condensation of the combined cooling and power system based on thermodynamic cycle.
CO 2 The near critical area has the characteristics of high density, high specific heat capacity, high heat conductivity coefficient and the likeCO is adopted 2 As a circulating working medium of a combined cooling and power system, and CO 2 The temperature is reduced below the critical temperature, which is beneficial to reducing the compression work and the volume of the system.
The patent specification with publication number CN 115539216A discloses a comprehensive heat management system of a hypersonic aircraft based on Brayton cycle, which adopts fuel and carbon dioxide as coolant, and exchanges heat with high-temperature carbon dioxide after the heat load of fuel absorption equipment, and exchanges heat with low-temperature carbon dioxide after temperature rise. Compared with the direct heat exchange of high-temperature carbon dioxide and low-temperature carbon dioxide in the traditional heat regenerator, the technology adopts fuel as an intermediate medium, reduces the temperature difference of cold and hot fluid in the heat regenerator, and avoids the problem of pinch points in the heat regenerator.
The latent heat of vaporization of the fuel is greater than the sensible heat, taking into account that the fuel is the only available cold source in the combined cooling and power system of the aircraft and storing temperature versus CO 2 Has larger condensation influence, and uses the latent heat after fuel throttling as CO 2 The cold source of the combined cooling and power system can reduce the initial temperature of the fuel and obtain a large amount of gasification latent heat so that the fuel can convert CO 2 The problem that the cooling and power supply system of the aircraft is difficult to condense is solved when the cooling and power supply system is condensed to below the critical temperature, and the heat efficiency and the power generation capacity of the system are improved.
Disclosure of Invention
In view of the above technical problems and the shortcomings in the art, the present application provides a combined carbon dioxide-to-brayton-CO-power system and method coupled with latent heat of fuel, which uses the latent heat of fuel to convert CO 2 Is reduced to below the critical temperature to build up CO 2 The variable Brayton combined cooling and power system is used for cooling a high-temperature wall surface in a hypersonic aircraft, generating power by utilizing high-temperature heat load, solving the combined cooling and power requirement of the aircraft and limiting fuel heat sinking CO 2 And the cooling and power combined supply system is difficult to condense.
The application performs active cooling and expansion work and power generation. The application aims to fully utilize limited fuel latent heat and CO 2 Is characterized by physical property change, realizes the variable brayton cycle, and improvesHigh CO 2 The brayton system provides cooling capacity and work output per unit mass of working fluid.
A carbon dioxide-to-Brayton combined cooling and power system for coupling latent heat of fuel comprises a working medium pump, a preheater, a regenerator, a wall heat exchanger, an expander, a generator, a cooler, a condenser, a compressor, a throttle valve, a fuel pump, a fuel turbine and a fuel storage tank; the number of the condensers is one or two in series; the throttle valve is arranged on a pipeline connecting the fuel inlet of the condenser and the fuel outlet of the fuel storage tank and is used for throttling and reducing the pressure of the fuel from the fuel storage tank to enable the fuel to reach a gas-liquid two-phase state, and the number of the throttle valve is consistent with that of the condenser and corresponds to that of the condenser one by one;
the working medium pump, the preheater, the heat regenerator, the wall heat exchanger, the expander, the heat regenerator, the cooler and the condenser are sequentially connected to form a carbon dioxide circulation loop;
the fuel storage tank, the throttle valve, the condenser, the compressor and the wall heat exchanger are sequentially connected to form a first fuel pipeline;
the fuel storage tank, the fuel pump, the cooler, the preheater, the wall heat exchanger and the fuel turbine are sequentially connected to form a second fuel pipeline;
the generator is connected with the expander and converts output work of the expander into electric energy. In particular, the generator and expander may be selected to be coaxially or non-coaxially connected depending on the particular spatial layout of the system.
The working medium of the carbon dioxide-to-Brayton combined cooling and power system coupled with the latent heat of fuel is CO 2 The method comprises the steps of carrying out a first treatment on the surface of the The fuel in the fuel storage tank is split at the outlet of the storage tank and is respectively connected with the throttle valve and the fuel pump; a part of fuel is throttled and depressurized through the throttle valve, and the other part of fuel is pressurized through the fuel pump; the throttle valve is connected with the condenser, and the fuel absorbs CO in the condenser by utilizing latent heat 2 Is then fed into the compressor; the fuel pump is connected with the cooler, and the fuel is connected with CO in the cooler 2 Heat exchange, and then part of heat is input into the preheater and is input into CO at the outlet of the working medium pump 2 In (1)The fuel at the outlet of the heater and the fuel at the outlet of the compressor are taken as a coolant of the high-temperature wall surface to enter the wall surface heat exchanger to absorb the heat load of the high-temperature wall surface; CO 2 The inlet of the working medium pump is in a state that the temperature and the pressure are lower than the critical point (the critical temperature is 304K, and the critical pressure is 7.38 MPa); the working medium pump outlet is connected with the carbon dioxide inlet of the preheater and is used for inputting the heat of the high-temperature fuel to the CO 2 In (a) and (b); the carbon dioxide outlet of the preheater is connected with the high-pressure side inlet of the heat regenerator; the outlet of the high-pressure side of the heat regenerator is connected with the inlet of the wall heat exchanger; CO 2 As a coolant for the high-temperature wall surface, absorbing the heat load of the high-temperature wall surface in the wall surface heat exchanger; the outlet of the wall heat exchanger is connected with the inlet of the expander and is used for converting CO 2 Performing heat-power conversion; the generator and the expander can be coaxially or non-coaxially connected according to the specific space layout of the system, and the output work of the expander is converted into electric energy; the outlet of the expander is connected with the low-pressure side inlet of the heat regenerator and is used for connecting CO at the outlet of the expander 2 CO with heat input to the high pressure side of the regenerator 2 In (a) and (b); the outlet of the low-pressure side of the heat regenerator is sequentially connected with the cooler and the condenser; the throttle valve is connected with the fuel storage tank and is used for throttling and reducing the pressure of a part of fuel from the fuel storage tank so that the fuel reaches a gas-liquid two-phase state; the fuel pump is used for pressurizing the other part of fuel from the fuel storage tank to be above the critical point pressure and then discharging the fuel; CO in the condenser 2 Heat exchange is carried out with the fuel at the outlet of the throttle valve, and CO 2 Condensing is achieved by utilizing the latent heat of fuel gasification, and the fuel enters a working medium pump. The fuel outlet of the condenser is connected with the compressor, and the fuel is used for raising the pressure to a supercritical state through the compressor, but is still lower than the pressure of the fuel flowing out of the preheater; fuel absorption CO in a cooler 2 After heat load of (2) the temperature rises and part of the heat is input into the CO in the preheater 2 In (a) and (b); the fuel flowing out of the preheater enters a wall heat exchanger, absorbs heat and heats up, and then enters a fuel turbine for heat-power conversion; the fuel flowing out of the compressor enters the wall heat exchanger, absorbs heat and heats up, and then directly enters the combustion chamber for combustion propulsion.
In a preferred embodiment, the carbon dioxide-to-brayton combined cooling and power system coupled with the latent heat of the fuel is one condenser and one throttle valve.
In a preferred embodiment, the carbon dioxide-to-brayton combined cooling and power system coupled with the latent heat of the fuel includes two condensers and two throttle valves, and the first fuel pipeline is split before the two throttle valves and is converged at the fuel outlets of the two condensers.
In a preferred embodiment, the carbon dioxide-to-brayton combined cooling and power system coupled with latent heat of fuel is such that fuel from a fuel storage tank reaches a temperature lower than that of CO after being throttled by the throttle valve 2 The state of condensing temperature, then reaching a saturated gas phase state or a superheated gas state at a fuel outlet of the condenser after absorbing heat in the condenser; the fuel at the outlet of the compressor reaches a supercritical state;
the fuel from the fuel storage tank reaches a supercritical state at the fuel pump outlet; the fuel pressure at the fuel pump outlet is higher than the fuel pressure at the compressor outlet to avoid excessive compressor load.
In a preferred embodiment, the carbon dioxide-to-brayton combined cooling and power system coupled with the latent heat of the fuel comprises a flow passage taking the fuel at the outlet of the compressor as a coolant, a flow passage taking the fuel at the fuel outlet of the preheater as a coolant and CO 2 The three flow channels are fixedly embedded into a high-temperature wall surface to be cooled and are integrally formed with a wall surface of a device to be cooled.
Further preferably, the high temperature wall is an aircraft engine wall and/or an aircraft head wall. The high temperature wall surface is heated and warmed by the high Wen Lailiu in the flying process, and the wall surface heat is generated by the fuel and CO in the flow channel 2 And the temperature of the wall surface is reduced by taking away, so that the aim of cooling is fulfilled.
In a preferred embodiment, the carbon dioxide-to-brayton combined cooling and power system coupled with latent heat of fuel is CO 2 The temperature at the carbon dioxide outlet of the cooler is above the critical temperature (304K), is condensed by the fuel in the condenser below the critical temperature, and is oxidized in the condenserThe carbon outlet is in a saturated or supercooled liquid state.
In a preferred embodiment, the temperature of the fuel in the cooler increases after absorbing the heat load of the carbon dioxide, and then part of the heat is input into the carbon dioxide in the preheater, so that the temperature of the fuel entering the wall heat exchanger is reduced, and the CO is increased 2 Work doing capability and cyclic thermal efficiency. According to the application, the arrangement of the preheater and the heat exchange of the fuel and the carbon dioxide in the preheater are found, and although the influence on the total heat is small, the whole work of the system can be obviously improved, the temperature of the carbon dioxide is higher, and the output power of the system is higher.
In a preferred embodiment, the carbon dioxide-to-brayton combined cooling and power system coupled with the latent heat of the fuel is an expansion machine, and the expansion machine is a positive displacement expansion machine selected from a piston expansion machine or a vortex expansion machine.
The application also provides a carbon dioxide-to-Brayton combined cooling and power supply method for coupling the latent heat of the fuel, wherein the carbon dioxide-to-Brayton combined cooling and power supply system for coupling the latent heat of the fuel is adopted, and the condenser and the throttle valve are both one;
the carbon dioxide cloth Lei Duleng electricity-coupling method for coupling the latent heat of fuel comprises the following steps:
after a part of the fuel flowing out of the fuel storage tank is throttled by a throttle valve, the latent heat of the fuel is used as CO 2 Cryogenic cold source for condensation process in variable brayton system, and fuel absorbs CO in condenser 2 Forming saturated gas after condensing the heat load, and pressurizing to a supercritical state through a compressor; the fuel at the outlet of the compressor is taken as a coolant of the high-temperature wall surface to enter the wall surface heat exchanger to absorb the heat load of the high-temperature wall surface, and then enters the combustion chamber for combustion propulsion;
another part of fuel flowing out of the fuel storage tank is pressurized to a supercritical state by a fuel pump and then is used as CO 2 A cold source for cooling process, and CO in a cooler 2 Exchanging heat, then entering a preheater to re-input part of heat into CO flowing out of a working medium pump 2 In (a) and (b); the fuel at the fuel outlet of the preheater is taken as coolant of the high-temperature wall surface to enter the wall surface heat exchanger to absorb the heat load of the high-temperature wall surface, and then the fuel is combustedThe material enters a fuel turbine to perform expansion and heat-power conversion, so that high-temperature fuel is utilized to generate electricity;
CO 2 after being pressurized by a working medium pump, the working medium pump absorbs heat and heats up in a preheater, a regenerator and a wall heat exchanger, then enters an expander to perform heat-work conversion to output electric energy, and CO at the outlet of the expander 2 The condensed water enters a working medium pump after passing through a heat regenerator, a cooler and a condenser, and one working cycle is completed.
The application also provides a carbon dioxide changing Brayton combined cooling and power supply method for coupling the latent heat of the fuel, wherein the carbon dioxide changing Brayton combined cooling and power supply system for coupling the latent heat of the fuel is adopted, two condensers and two throttle valves are adopted, the first fuel pipeline is divided before the two throttle valves, and the two fuel pipelines are converged at the fuel outlets of the two condensers;
the carbon dioxide cloth Lei Duleng electricity-coupling method for coupling the latent heat of fuel comprises the following steps:
the fuel flowing out of the fuel storage tank is divided into three parts, wherein one part of the fuel is throttled by a first throttle valve and then is cooled to a state lower than the condensing temperature of carbon dioxide, and enters a first condenser to condense the carbon dioxide to a saturated liquid state, and the other part of the fuel is throttled by a second throttle valve and then is cooled to a temperature lower than the carbon dioxide outlet temperature of a second condenser, and enters the second condenser to further cool the saturated liquid carbon dioxide at the carbon dioxide outlet of the first condenser to a supercooled liquid state, and the other part of the fuel is pressurized to a supercritical state by a fuel pump and then enters a cooler;
the fuel absorbs heat in the first condenser and the second condenser and then reaches a saturated liquid phase state, the fuel flowing out of the first condenser and the second condenser is mixed and then enters the compressor to be boosted to supercritical pressure, then enters the wall heat exchanger to be used as a wall coolant to absorb heat load, and finally directly enters the combustion chamber for combustion propulsion after flowing out of a fuel outlet of the wall heat exchanger;
the temperature of the fuel flowing out of the cooler is higher after absorbing heat, and the fuel enters the preheater to input part of heat into the CO in the preheater 2 In (a) and (b); fuel discharge from preheaterThe port is connected with the wall heat exchanger, and fuel flowing out of the preheater absorbs heat in the wall heat exchanger and heats up, and then enters the fuel turbine to perform heat-work conversion to output electric energy;
CO 2 after being pressurized by a working medium pump, the working medium pump absorbs heat and heats up in a preheater, a regenerator and a wall heat exchanger, then enters an expander to perform heat-work conversion to output electric energy, and CO at the outlet of the expander 2 The condensed water enters the working medium pump after passing through the heat regenerator, the cooler, the first condenser and the second condenser, and one working cycle is completed.
Compared with the prior art, the application has the beneficial effects that:
1. the application provides a CO coupling the latent heat of fuel 2 Variable Brayton combined cooling and power system and method for realizing CO by utilizing latent heat after fuel throttling 2 Is condensed to construct CO 2 The variable Brayton cycle combined cooling and power system solves the problem of condensation difficulty existing in the existing aircraft combined cooling and power system under the background of limited fuel heat sink.
2. The application provides a CO coupling the latent heat of fuel 2 The variable Brayton combined cooling and power system and method adopt a fuel split mode to improve the fuel and CO 2 To reduce CO 2 The fuel flow required for the cooling and condensing process. Compared with CO utilizing sensible heat of fuel 2 The application provides a CO coupling latent heat of fuel in a variable Brayton cycle 2 Variable Brayton combined cooling and power system capable of converting CO in the system 2 The flow ratio with the fuel is increased from 0.15 to 1.14, the average heat exchange temperature difference in the cooling process is reduced by 106K, the quality penalty problem caused by excessive carrying of the cooling fuel of the aircraft can be reduced by the efficient utilization of the fuel heat sink, and the hypersonic aircraft is in line with the lightweight and compact development of the hypersonic aircraft.
The flow ratio is defined as follows:
wherein,,is CO 2 The mass flow rate of (2) is expressed in kg/s; q m,f Is the mass flow rate of fuel, and the unit is kg/s.
3. The application provides a CO coupling the latent heat of fuel 2 Variable Brayton combined cooling and power system and method for implementing CO in limited fuel heat sink background 2 Is reduced in CO 2 Compression work of (a); increase fuel and CO 2 Further coupling in the preheater, such that the CO 2 The work capacity in the expander is increased. Under the condition that the fuel storage temperature is 318K, the high-temperature wall surface temperature is in the range of 950-1600K, compared with the traditional CO 2 Backheating brayton cycle, CO coupled with latent heat of fuel 2 The unit mass working fluid generating capacity of the variable Brayton combined cooling and power system is improved by 1.6% -12.0%, the temperature of fuel entering the wall heat exchanger is reduced, and the cooling capacity of the fuel is improved.
4. The application provides a CO coupling the latent heat of fuel 2 Variable Brayton combined cooling and power system and method, fuel is further split at an inlet of a condenser, and CO is absorbed in a first condenser and a second condenser respectively after the fuel is throttled and cooled 2 Heat load is increased by CO 2 Supercooling degree at the inlet of working medium pump and optimizing CO 2 Heat exchange matching with fuel; improve CO 2 When the supercooling degree is large, the fuel flow rate consumed in a single condenser is large and the fuel and CO are mixed 2 The heat exchange is not matched; increase fuel and CO 2 Further coupling in the preheater, such that the CO 2 The work capacity in the expander is increased. Under the condition that the fuel storage temperature is 318K, the high-temperature wall surface temperature is in the range of 950-1600K, compared with the traditional CO 2 Backheating brayton cycle, CO coupled with latent heat of fuel 2 The unit mass working fluid generating capacity of the variable Brayton combined cooling and power system is improved by 5.6% -21.5%, the temperature of fuel entering the wall heat exchanger is reduced, and the cooling capacity of the fuel is improved.
Drawings
FIG. 1 is a CO coupling the latent heat of fuel of example 1 2 Variable brayton combined cooling and power system and working flow schematic diagram thereof;
FIG. 2 is CO of example 1 2 A flow ratio change chart in a condenser and a cooler of the variable Brayton combined cooling and power system;
FIG. 3 is CO of example 1 2 A comparison chart of the generated energy of the working fluid in unit mass of the variable Brayton combined cooling and power system;
FIG. 4 is CO of example 1 2 A change chart of the thermal efficiency of the variable Brayton combined cooling and power system at different fuel storage temperatures;
FIG. 5 is a CO coupling the latent heat of fuel of example 2 2 Variable brayton combined cooling and power system and working flow schematic diagram thereof;
FIG. 6 is CO of example 2 2 A comparison graph of the power generation amount of working fluid in unit mass of a variable Brayton combined cooling and power system.
Detailed Description
The application will be further elucidated with reference to the drawings and to specific embodiments. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application.
Example 1
CO 2 The critical temperature is about 304K and the critical pressure is about 7.38MPa. CO 2 The density and specific heat capacity below the critical point are higher, and the CO is reduced 2 The lowest temperature in the cycle can reduce the work consumption of the compression process and improve the CO 2 Cooling capacity on the high pressure side. Sensible heat of fuel to CO 2 CO from condensation 2 The variable brayton system consumes a larger fuel flow during condensation and requires a higher storage temperature for the fuel when the fuel storage temperature is higher than the CO 2 At condensing temperature, the fuel cannot meet the CO 2 The condensation requirement of the variable Brayton combined cooling and power system is that the condensation is difficult.
In this example, the fuel split system shown in fig. 1 is adopted, and since the fuel absorbs heat to produce a cracking gas containing a large amount of components, the calculation of flow and thermodynamic characteristics is complex, and n-decane is generally used instead of the fuel, in this example, n-decane is used instead of the fuel for analysis. Using fuelLatent heat to CO 2 Condensing CO by utilizing sensible heat of fuel 2 Cooling is performed. When CO 2 After the temperature in the cooler 7 has decreased, it enters the condenser 8 where it transfers the heat load to the fuel in a two-phase state, effecting a variable brayton cycle.
The carbon dioxide-to-brayton combined cooling and power system for coupling latent heat of fuel comprises a working medium pump 1, a preheater 2, a regenerator 3, a wall heat exchanger 4, an expander 5, a generator 6, a cooler 7, a condenser 8, a compressor 12, a throttle valve 10, a fuel pump 11, a fuel turbine 13 and a fuel storage tank 9 as shown in fig. 1.
A throttle valve 10 is provided on a line connecting the fuel inlet of the condenser 8 and the fuel outlet of the fuel tank 9 for throttling and depressurizing the fuel from the fuel tank 9 to bring the fuel into a gas-liquid two-phase state.
The working medium pump 1, the preheater 2, the heat regenerator 3, the wall heat exchanger 4, the expander 5, the heat regenerator 3, the cooler 7 and the condenser 8 are sequentially connected to form a carbon dioxide circulation loop.
The fuel storage tank 9, the throttle valve 10, the condenser 8, the compressor 12 and the wall heat exchanger 4 are sequentially connected to form a first fuel pipeline.
The fuel storage tank 9, the fuel pump 11, the cooler 7, the preheater 2, the wall heat exchanger 4 and the fuel turbine 11 are sequentially connected to form a second fuel pipeline.
The generator 6 and the expander 5 may be connected coaxially or non-coaxially according to the specific spatial layout of the system, and the work output by the expander 5 is converted into electric energy.
The fuel from the fuel tank 9 reaches a temperature below that of CO after being throttled by the throttle valve 10 2 The state of condensing temperature, and then reaching a saturated gas phase state or an superheated gas state at the fuel outlet of the condenser 8 after absorbing heat in the condenser 8. The fuel at the outlet of the compressor 12 reaches a supercritical state.
The fuel from the fuel tank 9 reaches a supercritical state at the outlet of the fuel pump 11.
The fuel pressure at the outlet of the fuel pump 11 is higher than the fuel pressure at the outlet of the compressor 12.
The flow passage of the wall heat exchanger 4 comprises a compressor12 outlet fuel as coolant flow path, preheater 2 fuel outlet fuel as coolant flow path and CO 2 The three flow channels are fixedly embedded into a high-temperature wall surface to be cooled and are integrally formed with a wall surface of a device to be cooled.
The high temperature wall may be an aircraft engine wall and/or an aircraft nose wall. The high temperature wall surface is heated and warmed by the high Wen Lailiu in the flying process, and the wall surface heat is generated by the fuel and CO in the flow channel 2 And the temperature of the wall surface is reduced by taking away, so that the aim of cooling is fulfilled.
CO 2 The temperature at the carbon dioxide outlet of the cooler 7 is higher than the critical temperature, is condensed by the fuel in the condenser 8 to below the critical temperature, and is in a saturated or supercooled liquid state at the carbon dioxide outlet of the condenser 8.
The expander 5 may be a positive displacement expander, and may be specifically selected from a piston expander or a scroll expander.
The carbon dioxide changing Brayton combined cooling and power supply system for coupling the latent heat of the fuel comprises the following steps:
a part of the fuel flowing out from the fuel tank 9 is throttled by the throttle valve 10, and then the latent heat of the fuel is used as CO 2 Cryogenic cold source of condensation process in variable brayton system, and fuel absorbs CO in condenser 8 2 Is saturated after the condensation heat load and is pressurized to a supercritical state by the compressor 12; the fuel at the outlet of the compressor 12 is taken as a coolant of a high-temperature wall surface to enter the wall surface heat exchanger 4 to absorb the heat load of the high-temperature wall surface, and then enters a combustion chamber for combustion propulsion;
another part of the fuel flowing out of the fuel storage tank 9 is pressurized to a supercritical state by the fuel pump 11 and then used as CO 2 The cold source of the cooling process is cooled in the cooler 7 together with CO 2 Heat exchange is carried out, and then part of heat is input into the preheater 2 and is input into CO flowing out of the working medium pump 1 2 In (a) and (b); the fuel at the fuel outlet of the preheater 2 is taken as a coolant of the high temperature wall surface to be introduced into the wall surface heat exchanger 4 to absorb the heat load of the high temperature wall surface, and then the fuel is introduced into the combustion chamberExpansion and heat-power conversion are performed in the material turbine 13, thereby generating electricity using high-temperature fuel;
CO 2 after being pressurized by a working medium pump 1, the working medium pump absorbs heat in a preheater 2, a heat regenerator 3 and a wall heat exchanger 4 to raise temperature, and then enters an expander 5 to perform heat-work conversion to output electric energy, and CO at the outlet of the expander 5 2 The condensed water enters the working medium pump 1 after passing through the heat regenerator 3, the cooler 7 and the condenser 8, and one working cycle is completed.
As shown in fig. 2, when the storage temperature of the fuel in the tank increases, the CO is cooled 2 The required fuel flow increases and the flow ratio in the cooler 7 and the condenser 8 decreases. Compared to using the sensible heat of fuel CO 2 Variable Brayton combined cooling and power system, CO coupling latent heat of fuel according to the embodiment 2 The variable Brayton combined cooling and power system increases the flow ratio of carbon dioxide to fuel in the condenser from 0.15 to 1.96 when the fuel storage temperature is increased from 293K to 298K; as the fuel storage temperature gradually increases, CO utilizing the sensible heat of the fuel 2 The variable brayton combined cooling and power system can not realize CO 2 But the application provides the CO coupled with the latent heat of the fuel 2 The variable Brayton combined cooling and power system can adapt to higher fuel storage temperature, and can realize CO within the fuel storage temperature range of 293-333K 2 The flow ratio in the condenser is reduced to 1.52 after increasing from 0.15 to 1.96, compared to the CO utilizing the sensible heat of the fuel 2 The variable brayton combined cooling and power system still has advantages in reducing fuel flow consumption.
As shown in FIG. 3, the CO of example 1 coupled with the latent heat of the fuel 2 Compression work of the variable brayton combined cooling and power system is remarkably reduced compared with that of the traditional brayton system, and fuel and CO are increased 2 Coupling process in preheater, CO 2 The work capacity in the expander is improved. In the range of 293-318K, the embodiment provides the CO coupling the latent heat of the fuel 2 The power generation capability of the variable brayton combined cooling and power system is advantageous. The high temperature wall temperature is in the range of 950 to 1600K under the condition of 318K fuel storage temperature, the system unit of the embodimentCompared with the traditional regenerative brayton system, the generating capacity of the mass working fluid is improved by 1.6% -12.0%.
As shown in FIG. 4, the CO of example 1 coupled with the latent heat of the fuel at a fuel storage temperature of 293-318K 2 Compared with the traditional regenerative Brayton system, the thermal efficiency of the variable Brayton combined cooling and power system is improved by 0.05-14.62%. As the fuel storage temperature increases from 293K to 298K, the additional compression work of the fuel reduces the thermal efficiency of the variable brayton system from 32.8% to 19.2%, but still has advantages over the regenerative brayton system.
Example 2
CO enhancement 2 The supercooling degree at the inlet of the working medium pump 1 can further reduce CO 2 But the temperature requirements for the fuel are also increased. When CO 2 When the supercooling degree is large, the temperature required by the throttled fuel is further reduced, and the two-phase fuel is directly combined with the supercooled liquid CO 2 The flow rate consumption of the fuel increases and the heat exchange matching property becomes poor.
For CO 2 The present application proposes a carbon dioxide-to-brayton combined cooling and power system of embodiment 2, which is similar to embodiment 1, except that the two condensers and the two throttle valves are all provided, the first fuel line is split before the two throttle valves, and the fuel outlets of the two condensers are merged, as shown in fig. 4.
The operation is substantially similar to that of example 1, in particular:
the fuel flowing out of the fuel storage tank 9 is divided into three parts, wherein one part of the fuel is throttled by a first throttle valve 10 and then is cooled to a temperature which is more than 1 ℃ lower than the condensation temperature of carbon dioxide, and enters a first condenser 8 to condense the carbon dioxide to a saturated liquid state, the other part of the fuel is throttled by a second throttle valve 14 and then is cooled to a temperature which is lower than the carbon dioxide outlet temperature of a second condenser 15, and enters the second condenser 15 to further cool the saturated liquid carbon dioxide at the carbon dioxide outlet of the first condenser 8 to a supercooled liquid state, and the other part of the fuel is pressurized to a supercritical state by a fuel pump 11 and then enters a cooler 7;
the fuel absorbs heat in the first condenser 8 and the second condenser 15 and reaches a saturated liquid phase state, the fuel flowing out of the first condenser 8 and the second condenser 15 is mixed and then enters the compressor 12 to be boosted to supercritical pressure, then enters the wall heat exchanger 4 to be used as a wall coolant to absorb heat load, and finally directly enters the combustion chamber for combustion and propulsion after flowing out of a fuel outlet of the wall heat exchanger 4;
the fuel flowing out of the cooler 7 has higher temperature after absorbing heat, and enters the preheater 2 to input part of heat into the CO in the preheater 2 2 In (a) and (b); the fuel outlet of the preheater 2 is connected with the wall heat exchanger 4, and the fuel flowing out of the preheater 2 absorbs heat in the wall heat exchanger 4 and rises temperature and then enters the fuel turbine 13 to perform heat-work conversion to output electric energy;
CO 2 after being pressurized by a working medium pump 1, the working medium pump absorbs heat in a preheater 2, a heat regenerator 3 and a wall heat exchanger 4 to raise temperature, and then enters an expander 5 to perform heat-work conversion to output electric energy, and CO at the outlet of the expander 5 2 The condensed refrigerant passes through the heat regenerator 3, the cooler 7, the first condenser 8 and the second condenser 15 and then enters the working medium pump 1 to complete one working cycle.
As shown in FIG. 5, the CO of example 2 coupled with the latent heat of the fuel 2 Variable brayton combined cooling and power system for further reduction of CO 2 Compression work to improve CO 2 Supercooling degree at the inlet of working medium pump for simultaneously ensuring CO 2 The example 2 adds a second condenser 15 and splits the fuel again, matching the heat exchange of the fuel. A part of the fuel after the split flow is used for separating CO in a first condenser 8 2 Condensing to saturated liquid state, and introducing a part of fuel into a second condenser 15 to convert CO 2 Cooling from saturated liquid to supercooled liquid.
As shown in FIG. 6, CO is further reduced 2 After compression work of (a), the embodiment provides CO coupling latent heat of fuel 2 Variable Brayton combined cooling and power system, and CO is improved through further diversion of fuel at condenser inlet 2 While optimizing the degree of supercooling 2 And the heat exchange of the fuel is matched with that of the fuel, so that the power generation capacity of the system is further improved. Under the condition that the fuel storage temperature is 318K, the high-temperature wall surface temperature is 950-1600In the range of K, the power generation amount of the working fluid in unit mass of the embodiment 2 is improved by 5.6-21.5% compared with that of the traditional regenerative Brayton system.
Further, it is to be understood that various changes and modifications of the present application may be made by those skilled in the art after reading the above description of the application, and that such equivalents are intended to fall within the scope of the application as defined in the appended claims.
Claims (10)
1. The carbon dioxide-to-brayton combined cooling and power system is characterized by comprising a working medium pump (1), a preheater (2), a regenerator (3), a wall heat exchanger (4), an expander (5), a generator (6), a cooler (7), a condenser, a compressor (12), a throttle valve, a fuel pump (11), a fuel turbine (13) and a fuel storage tank (9); the number of the condensers is one or two in series; the throttle valve is arranged on a pipeline connecting the fuel inlet of the condenser and the fuel outlet of the fuel storage tank (9) and is used for throttling and reducing the pressure of the fuel from the fuel storage tank (9) to enable the fuel to reach a gas-liquid two-phase state, and the number of the throttle valve is consistent with the number of the condensers and corresponds to one;
the working medium pump (1), the preheater (2), the heat regenerator (3), the wall heat exchanger (4), the expander (5), the heat regenerator (3) and the cooler (7) are sequentially connected with each other to form a carbon dioxide circulation loop;
the fuel storage tank (9), the throttle valve, the condenser, the compressor (12) and the wall heat exchanger (4) are sequentially connected to form a first fuel pipeline;
the fuel storage tank (9), the fuel pump (11), the cooler (7), the preheater (2), the wall heat exchanger (4) and the fuel turbine (11) are sequentially connected to form a second fuel pipeline;
the generator (6) is connected with the expander (5) and converts the output work of the expander (5) into electric energy.
2. The combined fuel latent heat coupled carbon dioxide and brayton cooling system of claim 1, wherein the condenser and the throttle valve are one.
3. The combined fuel latent heat coupled carbon dioxide and brayton cycle power system of claim 1, wherein said condenser and said throttle valve are two, said first fuel line splits before said two throttle valves and merges at the fuel outlets of said two condensers.
4. The combined carbon dioxide-to-brayton-CO-power system coupled with latent heat of fuel according to claim 1, characterized in that the fuel from the fuel tank (9) reaches a temperature lower than CO after being throttled by the throttle valve 2 The state of condensing temperature, then reaching a saturated gas phase state or a superheated gas state at a fuel outlet of the condenser after absorbing heat in the condenser; the fuel at the outlet of the compressor (12) reaches a supercritical state;
the fuel from the fuel storage tank (9) reaches a supercritical state at the outlet of the fuel pump (11); the fuel pressure at the outlet of the fuel pump (11) is higher than the fuel pressure at the outlet of the compressor (12).
5. The combined fuel latent heat coupled carbon dioxide and brayton cooling system according to claim 1, wherein the flow passage of the wall heat exchanger (4) comprises a flow passage with fuel at the outlet of the compressor (12) as a coolant, a flow passage with fuel at the fuel outlet of the preheater (2) as a coolant, and CO 2 The three flow channels are fixedly embedded into a high-temperature wall surface to be cooled and are integrally formed with a wall surface of a device to be cooled.
6. The combined fuel latent heat coupled carbon dioxide and brayton cooling system of claim 5, wherein the high temperature wall is an aircraft engine wall and/or an aircraft head wall.
7. The combined fuel latent heat coupled carbon dioxide-to-brayton-CO-power system of claim 1, wherein CO 2 The temperature at the carbon dioxide outlet of the cooler (7) is higher than that of the next temperatureThe boundary temperature is condensed by the fuel in the condenser to below the critical temperature, and is in a saturated or supercooled liquid state at a carbon dioxide outlet of the condenser.
8. The combined fuel latent heat coupled carbon dioxide and brayton cooling system according to claim 1, wherein the fuel in the cooler (7) absorbs the heat load of carbon dioxide and then increases in temperature, and then part of the heat is input into the carbon dioxide in the preheater (2).
9. A method for carbon dioxide-to-brayton co-power coupling with latent heat of fuel, characterized in that the carbon dioxide-to-brayton co-power coupling system coupling with latent heat of fuel according to claim 2 is adopted;
the carbon dioxide cloth Lei Duleng electricity-coupling method for coupling the latent heat of fuel comprises the following steps:
after a part of the fuel flowing out from the fuel storage tank (9) is throttled by a throttle valve (10), the latent heat of the fuel is used as CO 2 Cryogenic cold source of condensation process in variable brayton system, fuel absorbs CO in condenser (8) 2 Forming saturated gas after condensing the heat load, and pressurizing to a supercritical state through a compressor (12); the fuel at the outlet of the compressor (12) is taken as a coolant of a high-temperature wall surface to enter a wall surface heat exchanger (4) to absorb the heat load of the high-temperature wall surface, and then enters a combustion chamber for combustion propulsion;
another part of the fuel flowing out from the fuel storage tank (9) is pressurized to a supercritical state by the fuel pump (11) and then used as CO 2 The cold source of the cooling process is cooled in a cooler (7) together with CO 2 Exchanging heat, then entering a preheater (2) to re-input part of heat into CO flowing out of a working medium pump (1) 2 In (a) and (b); the fuel at the fuel outlet of the preheater (2) is taken as a coolant of a high-temperature wall surface to enter the wall surface heat exchanger (4) to absorb the heat load of the high-temperature wall surface, and then the fuel enters the fuel turbine (13) to perform expansion and heat work conversion, so that the high-temperature fuel is utilized to generate electricity;
CO 2 is pressurized by a working medium pump (1) and then is sucked in a preheater (2), a heat regenerator (3) and a wall heat exchanger (4)Heating, then entering an expander (5) to perform heat-power conversion to output electric energy, and outputting CO at the outlet of the expander (5) 2 The condensed water enters the working medium pump (1) after passing through the heat regenerator (3), the cooler (7) and the condenser (8) to finish one working cycle.
10. A method for carbon dioxide-to-brayton co-power coupling with latent heat of fuel, characterized in that the carbon dioxide-to-brayton co-power coupling system coupling with latent heat of fuel according to claim 3 is adopted;
the carbon dioxide cloth Lei Duleng electricity-coupling method for coupling the latent heat of fuel comprises the following steps:
the fuel flowing out of the fuel storage tank (9) is divided into three parts, one part of the fuel is throttled by a first throttle valve (10) and then is cooled to a state lower than the condensation temperature of carbon dioxide, the fuel enters a first condenser (8) to condense the carbon dioxide to a saturated liquid state, the temperature of the fuel is cooled to a state lower than the carbon dioxide outlet temperature of a second condenser (15) after being throttled by a second throttle valve (14), the saturated liquid-phase carbon dioxide at the carbon dioxide outlet of the first condenser (8) is further cooled to a supercooled liquid-phase state in the second condenser (15), and the other part of the fuel enters a cooler (7) after being pressurized to a supercritical state by a fuel pump (11);
the fuel absorbs heat in the first condenser (8) and the second condenser (15) and reaches a saturated liquid phase state, the fuel flowing out of the first condenser (8) and the second condenser (15) is mixed and then enters the compressor (12) to be pressurized to supercritical pressure, then enters the wall heat exchanger (4) to be used as a wall coolant to absorb heat load, and finally directly enters the combustion chamber for combustion and propulsion after flowing out of a fuel outlet of the wall heat exchanger (4);
the temperature of the fuel flowing out of the cooler (7) is higher after absorbing heat, and the fuel enters the preheater (2) to input part of heat into the CO in the preheater (2) 2 In (a) and (b); the fuel outlet of the preheater (2) is connected with the wall heat exchanger (4), and the fuel flowing out of the preheater (2) absorbs heat in the wall heat exchanger (4) and then enters the fuel turbine (13) for heat power conversion to output electric energy;
CO 2 pressurizing by a working medium pump (1)Then absorbs heat and heats up in the preheater (2), the heat regenerator (3) and the wall heat exchanger (4), and then enters the expander (5) to perform heat-work conversion to output electric energy, and CO at the outlet of the expander (5) 2 The condensed water enters the working medium pump (1) after passing through the heat regenerator (3), the cooler (7), the first condenser (8) and the second condenser (15), and one working cycle is completed.
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