CN105673107A - Trough and tower collecting compound driven supercritical carbon dioxide generating system and method - Google Patents

Trough and tower collecting compound driven supercritical carbon dioxide generating system and method Download PDF

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Publication number
CN105673107A
CN105673107A CN201610036862.9A CN201610036862A CN105673107A CN 105673107 A CN105673107 A CN 105673107A CN 201610036862 A CN201610036862 A CN 201610036862A CN 105673107 A CN105673107 A CN 105673107A
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supercritical carbon
working medium
pressure
carbon dioxide
temperature
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CN105673107B (en
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韩巍
金红光
姜迎春
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Institute of Engineering Thermophysics of CAS
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Institute of Engineering Thermophysics of CAS
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08Plants 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
    • F01K25/10Plants 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03GSPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00Devices for producing mechanical power from solar energy
    • F03G6/06Devices for producing mechanical power from solar energy with solar energy concentrating means
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

Abstract

The invention relates to a trough and tower collecting compound driven supercritical carbon dioxide generating system and method. The system comprises a high-temperature tower type collecting subsystem, a low-temperature trough type collecting subsystem and a supercritical carbon dioxide Brayton cycle generating subsystem, wherein the high-temperature tower type collecting subsystem which is used as a high-temperature heat source is a main source of system input energy and is used for heating supercritical carbon dioxide fluid and increasing the working capability of supercritical carbon dioxide; the low-temperature trough type collecting subsystem is used as an auxiliary heat source and is used for making up the backheating insufficiency of a working medium on the high-pressure side and improving the heat exchange efficiency of the system; the supercritical carbon dioxide Brayton cycle generating subsystem is used for improving the heat exchange efficiency of the system by utilizing a low-grade heat source and reducing heat loss caused by large heat exchange temperature difference between the high-pressure side and the low-pressure side in a regenerator. According to the system, the characteristic that compression work of the supercritical working medium is less near a critical point is fully utilized, and the compression work consumption is reduced; compared with recompression Brayton cycle, a recompressor is omitted, and the system structure is simplified.

Description

The supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower and method
Technical field
The present invention relates to regenerative resource applied technical field, the supercritical carbon dioxide electricity generation system of especially a kind of heat collection combined driving of groove tower and method.
Background technology
The method improving solar energy power plant efficiency has a lot, and most effective of which method is to improve power cycle, and supercritical carbon dioxide Brayton cycle is arisen at the historic moment.
Supercritical carbon dioxide is a kind of desirably working medium for enclosed TRT, it very low cost, non-combustible, non-corrosiveness, stable chemical nature, can be applied not only to solar energy thermal-power-generating power cycle, it is also possible to be applied to the dynamical system being thermal source with nuclear energy, geothermal energy and Fossil fuel.
The density of supercritical carbon dioxide is relatively big, turbomachinery smaller, compares traditional power circulating device, with supercritical carbon dioxide be working medium power cycle structure closely, it will reduce the floor space of power set. Additionally, due to supercritical carbon dioxide does not have phase transition process in the circulating cycle, the Temperature Matching degree with thermal source is good, improves heat exchange efficiency; Meanwhile, turbomachinery is also because working medium increases the service life without phase transition process. Owing to carbon dioxide density of (31.1 DEG C, 7.39MPa) near point of proximity is very big, compressibility is less, and the power of compressor is relatively low, and the power consumption of compressor less be the main cause that supercritical carbon dioxide Brayton cycle efficiency is higher; When turbine-inlet temperature is 650 DEG C, the thermal efficiency of cycle of system can reach 50%. Expecting future, along with the application of high-temperature material, the inlet temperature of high-performance turbine can reach 700 DEG C, and system thermal efficiency of cycle will close to 53% when the time comes.
Current supercritical carbon dioxide Brayton cycle mainly has two kinds of endless form, is simple Brayton cycle and recompression Brayton cycle respectively. Simple Brayton cycle is relatively big due to the regenerator internal heat temperature difference, and irreversible loss is relatively big, compares traditional endless form, and the raising of cycle efficieny is also inconspicuous. Recompressing Brayton cycle is then a part of work done during compression of many consumption, greatly reduces heat recovery process irreversible loss. The cycle efficieny of system is obviously improved, but the introducing of recompression machine, make the structure relative complex of system, system building cost up.
The supercritical carbon dioxide electricity generation system of a kind of heat collection combined driving of groove tower that the present invention proposes and method, the mode that different grade external heat source complementation utilizes is adopted to solve regenerator heat exchange mismatch problem, while improve the thermal efficiency, simplify the structure of system, reduce the equipment investment of system and the land area of solar energy thermal-power-generating factory.The present invention provides theoretical basis for reducing solar energy thermal-power-generating cost further, and solar energy thermal-power-generating development is had important function.
Summary of the invention
(1) to solve the technical problem that
At present, although the structure of simple supercritical carbon dioxide Brayton cycle is closely, economy is higher, but the thermal efficiency improves and inconspicuous, and this is to cause owing to the heat transfer temperature difference of regenerator mesohigh side and low-pressure side working medium is excessive; Recompression Bretton is provided with high/low temperature regenerator, and sets up recompression machine, solves the problem that regenerator heat transfer temperature difference is big, but consumes Partial shrinkage merit more, and system is more complicated. The present invention is directed to the problems referred to above, propose supercritical carbon dioxide electricity generation system and the method for a kind of heat collection combined driving of groove tower, adopt different grade solar heat-collection complementation Application way, energy release side and reception side in regenerator is made more to mate, while keeping system structure compactedness, improve cycle efficieny.
(2) technical scheme
For solving above-mentioned technical problem, the invention provides the supercritical carbon dioxide electricity generation system of a kind of heat collection combined driving of groove tower and method, this system includes the tower thermal-arrest subsystem of high temperature, low temperature slot type thermal-arrest subsystem and supercritical carbon dioxide Brayton cycle power generation sub-system, wherein: the tower thermal-arrest subsystem of high temperature, as high temperature heat source, it is the main source of system input energy, is used for heating supercritical carbon dioxide fluid, promote the acting ability of supercritical carbon dioxide; Low temperature slot type thermal-arrest subsystem, as auxiliary thermal source, the backheat for making up high-pressure side working medium is not enough, improves the heat exchange efficiency of system; Supercritical carbon dioxide Brayton cycle power generation sub-system, for utilizing low-grade thermal source to promote the heat exchange efficiency of system, reduces the heat loss caused greatly in regenerator due to high-pressure side and low-pressure side heat transfer temperature difference.
In such scheme, the tower thermal-arrest subsystem of described high temperature includes heliostat field 1, tower 2 and heat extractor 3, wherein, heat extractor 3 is positioned at the top of tower 2, entrance is connected to the high pressure side outlet of the high temperature regenerator 6 of supercritical carbon dioxide Brayton cycle power generation sub-system, and outlet is connected to the turbine 4 of supercritical carbon dioxide Brayton cycle power generation sub-system; Heat extractor 3 absorbs the solar energy from heliostat field 1, heats the supercritical carbon dioxide working medium through therein to the inlet temperature of the turbine 4 of supercritical carbon dioxide Brayton cycle power generation sub-system.
In such scheme, described low temperature slot type thermal-arrest subsystem includes endothermic tube 13 and parabola groove mirror field 12, and wherein, endothermic tube 13 absorbs the solar energy from parabolic groove type mirror field 12, adds the supercritical carbon dioxide working medium of thermal shunt; The entrance of endothermic tube 13 is connected to the diverter 11 of supercritical carbon dioxide Brayton cycle power generation sub-system, and outlet is connected to the entrance of the blender 8 of supercritical carbon dioxide Brayton cycle power generation sub-system.
In such scheme, described supercritical carbon dioxide Brayton cycle power generation sub-system includes turbine 4, electromotor 5, high temperature regenerator 6, cryogenic regenerator 7, blender 8, cooler 9, compressor 10 and diverter 11 wherein, supercritical carbon dioxide working medium after being heated by heat extractor 3, enter turbine 4 and in turbine 4 expansion work, then sequentially enter the low-pressure side of high temperature regenerator 6, the low-pressure side of cryogenic regenerator 7 and cooler 9 and cool down; Through above-mentioned a series of coolings, supercritical carbon dioxide working medium, close to critical state, forms High-pressure supercritical carbon dioxide working medium after entering back into compressor 10 compression;The outlet of compressor 10 is connected with diverter 11, High-pressure supercritical carbon dioxide working medium is after diverter 11 taps, one tunnel enters the high-pressure side of cryogenic regenerator 7, one tunnel enters blender 8 after the endothermic tube 13 of low temperature slot type collecting system heats, and the high pressure side outlet of cryogenic regenerator 7 is connected to blender 8; The mixed High-pressure supercritical carbon dioxide working medium of blended device 8 carries out backheat through the high pressure side inlet entrance high temperature regenerator 6 of high temperature regenerator 6, and then the supercritical carbon dioxide working medium after backheat is again introduced into the heat extractor 3 of the tower thermal-arrest subsystem of high temperature.
In such scheme, described endothermic tube 13 is for adding the supercritical carbon dioxide working medium of thermal shunt so that it is temperature is identical with the temperature of the supercritical carbon dioxide working medium heated through cryogenic regenerator 7.
In such scheme, the entrance of described compressor 10 is connected to cooler 9, and outlet is connected to diverter 11, for promoting the pressure of supercritical carbon dioxide working medium, forms High-pressure supercritical carbon dioxide working medium; It is compressed by compressor 10 at the Near The Critical Point of carbon dioxide working medium, makes full use of carbon dioxide and compresses little advantage at Near The Critical Point, reduces compressor power consumption.
In such scheme, described diverter 11 is for being divided into two-way by High-pressure supercritical carbon dioxide working medium, one tunnel is directly entered the high-pressure side of cryogenic regenerator 7 and carries out backheat, and another road enters endothermic tube 13, it is ensured that the working medium mass flow ratio of cryogenic regenerator high-pressure side and low-pressure side meets heat transfer requirements.
In such scheme, the outlet of described blender 8 is connected to the entrance of high temperature regenerator 6, for working medium mix homogeneously working medium and the endothermic tube 13 of cryogenic regenerator 7 high pressure side outlet exported.
For reaching above-mentioned purpose, present invention also offers the supercritical carbon dioxide electricity-generating method of a kind of heat collection combined driving of groove tower, the method includes: heat extractor 3 absorbs the solar energy from heliostat field 1, heats the supercritical carbon dioxide working medium through therein; Supercritical carbon dioxide working medium after being heated by heat extractor 3, enter turbine 4 and in turbine 4 expansion work, then sequentially enter the low-pressure side of high temperature regenerator 6, the low-pressure side of cryogenic regenerator 7 and cooler 9 and cool down; After supercooling, supercritical carbon dioxide working medium, close to critical state, forms High-pressure supercritical carbon dioxide working medium after entering back into compressor 10 compression; High-pressure supercritical carbon dioxide working medium is after diverter 11 taps, and a road enters the high-pressure side of cryogenic regenerator 7, and a road enters blender 8 after the endothermic tube 13 of low temperature slot type collecting system heats; The mixed High-pressure supercritical carbon dioxide working medium of blended device 8 carries out backheat through the high pressure side inlet entrance high temperature regenerator 6 of high temperature regenerator 6, and then the supercritical carbon dioxide working medium after backheat is again introduced into the heat extractor 3 of the tower thermal-arrest subsystem of high temperature.
In such scheme, described endothermic tube 13 absorbs the solar energy from parabolic groove type mirror field 12, adds the supercritical carbon dioxide working medium of thermal shunt.
(3) beneficial effect
It can be seen that the method have the advantages that from above-mentioned technical scheme
The supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower 1, proposed by the invention and method, using tower for the high temperature collecting system high temperature heat source as carbon dioxide Brayton cycle electricity generation system, be the main source of system dynamic circulation; Using the low temperature slot type collecting system auxiliary thermal source as system, for adding after thermal shunt for the working medium stream through cryogenic regenerator backheat, maintaining the heat balance of cryogenic regenerator, embodying can cascade utilization theory.
The supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower 2, proposed by the invention and method, eliminate recompression machine, compares existing recompression Brayton Cycle system, and working medium does not tap before entering cooler, but taps at compressor outlet. So all of working medium is all enter compressor compresses at Near The Critical Point, take full advantage of the supercritical carbon dioxide characteristic in " high density " of Near The Critical Point and " being close to incompressible ", reduce compression power consumption, improve the acting ability of system, generated energy is improved obviously, and optimizes systematic function.
The supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower 3, proposed by the invention and method, low temperature slot type collecting system is adopted to replace recompression machine, reduce compression power consumption, the problem simultaneously solving cryogenic regenerator energy release side shortage of heat, it is thus achieved that the heat exchange efficiency identical with the cryogenic regenerator of recompression Brayton Cycle system. The advantage that the present invention takes full advantage of parabola groove collecting system, tower collecting system, and the solar energy heating of different grades has been carried out cascade utilization, the solar energy that namely parabola groove Jing Chang and heliostat field are collected is respectively used to low temperature backheat and the superheating process of supercritical carbon dioxide.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to the embodiment of the present invention 1.
Fig. 2 is the schematic diagram of the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to the embodiment of the present invention 2.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
As shown in Figure 1, Fig. 1 is the schematic diagram of the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to the embodiment of the present invention 1, this system includes low temperature slot type thermal-arrest subsystem, the tower thermal-arrest subsystem of high temperature and supercritical carbon dioxide Brayton cycle power generation sub-system, wherein: low temperature slot type thermal-arrest subsystem, as auxiliary thermal source, backheat for making up high-pressure side working medium is not enough, the heat exchange efficiency of raising system, reduces the heat loss caused greatly in regenerator due to high-pressure side and low-pressure side heat transfer temperature difference; The tower thermal-arrest subsystem of high temperature, as high temperature heat source, is the main source of system input energy, is used for heating supercritical carbon dioxide fluid, promote the acting ability of supercritical carbon dioxide; Supercritical carbon dioxide Brayton cycle power generation sub-system, for being converted to electric energy by the interior of high-temperature supercritical carbon dioxide.
The tower thermal-arrest subsystem of high temperature includes heliostat field 1, tower 2 and heat extractor 3, wherein, heat extractor 3 is positioned at the top of tower 2, entrance is connected to the high pressure side outlet of the high temperature regenerator 6 of supercritical carbon dioxide Brayton cycle power generation sub-system, and outlet is connected to the turbine 4 of supercritical carbon dioxide Brayton cycle power generation sub-system; Heat extractor 3 absorbs the solar energy from heliostat field 1, heats the supercritical carbon dioxide working medium through therein to the inlet temperature of the turbine 4 of supercritical carbon dioxide Brayton cycle power generation sub-system.
Low temperature slot type thermal-arrest subsystem includes endothermic tube 13 and parabola groove mirror field 12, and wherein, endothermic tube 13 absorbs the solar energy from parabolic groove type mirror field 12, adds the supercritical carbon dioxide working medium of thermal shunt; The entrance of endothermic tube 13 is connected to the diverter 11 of supercritical carbon dioxide Brayton cycle power generation sub-system, and outlet is connected to the entrance of the blender 8 of supercritical carbon dioxide Brayton cycle power generation sub-system.
Supercritical carbon dioxide Brayton cycle power generation sub-system includes turbine 4, electromotor 5, high temperature regenerator 6, cryogenic regenerator 7, blender 8, cooler 9, compressor 10 and diverter 11, wherein, supercritical carbon dioxide working medium after being heated by heat extractor 3, enter turbine 4 and in turbine 4 expansion work, then sequentially enter the low-pressure side of high temperature regenerator 6, the low-pressure side of cryogenic regenerator 7 and cooler 9 and cool down; Through above-mentioned a series of coolings, supercritical carbon dioxide working medium, close to critical state, forms High-pressure supercritical carbon dioxide working medium after entering back into compressor 10 compression; The outlet of compressor 10 is connected with diverter 11, High-pressure supercritical carbon dioxide working medium is after diverter 11 taps, one tunnel enters the high-pressure side of cryogenic regenerator 7, one tunnel enters blender 8 after the endothermic tube 13 of low temperature slot type collecting system heats, and the high pressure side outlet of cryogenic regenerator 7 is connected to blender 8; The mixed High-pressure supercritical carbon dioxide working medium of blended device 8 carries out backheat through the high pressure side inlet entrance high temperature regenerator 6 of high temperature regenerator 6, and then the supercritical carbon dioxide working medium after backheat is again introduced into the heat extractor 3 of the tower thermal-arrest subsystem of high temperature.
In Fig. 1, endothermic tube 13 is for adding the supercritical carbon dioxide working medium of thermal shunt so that it is temperature is identical with the temperature of the supercritical carbon dioxide working medium heated through cryogenic regenerator 7. The entrance of compressor 10 is connected to condenser 9, and outlet is connected to diverter 11, for promoting the pressure of supercritical carbon dioxide working medium, forms High-pressure supercritical carbon dioxide working medium; It is compressed by compressor 10 at the Near The Critical Point of carbon dioxide working medium, makes full use of carbon dioxide and compresses little advantage at Near The Critical Point, reduces compressor power consumption. Diverter 11 is for being divided into two-way by High-pressure supercritical carbon dioxide working medium, one tunnel is directly entered the high-pressure side of cryogenic regenerator 7 and carries out backheat, another road enters endothermic tube 13, it is ensured that the working medium mass flow ratio of cryogenic regenerator high-pressure side and low-pressure side meets heat transfer requirements. The outlet of blender 8 is connected to the high pressure side inlet of high temperature regenerator 6, for the working medium mix homogeneously that the working medium exported by cryogenic regenerator 7 and endothermic tube 13 export.
The schematic diagram of supercritical carbon dioxide electricity generation system based on the heat collection combined driving of groove tower of the foundation embodiment of the present invention 1 shown in Fig. 1, present invention also offers a kind of slot type and tower collecting system combines the supercritical carbon dioxide Brayton cycle electricity-generating method of driving, the method includes following technological process: heat extractor 3 absorbs the solar energy from heliostat field 1, heats the supercritical carbon dioxide working medium through therein; Supercritical carbon dioxide working medium after being heated by heat extractor 3, enter turbine 4 and in turbine 4 expansion work, then sequentially enter the low-pressure side of high temperature regenerator 6, the low-pressure side of cryogenic regenerator 7 and cooler 9 and cool down; After supercooling, supercritical carbon dioxide working medium, close to critical state, forms High-pressure supercritical carbon dioxide working medium after entering back into compressor 10 compression; High-pressure supercritical carbon dioxide working medium is after diverter 11 taps, and a road enters the high-pressure side of cryogenic regenerator 7, enters blender 8 after backheat, and a road enters blender 8 after the endothermic tube 13 of low temperature slot type collecting system heats; The mixed High-pressure supercritical carbon dioxide working medium of blended device 8 carries out backheat through the high pressure side inlet entrance high temperature regenerator 6 of high temperature regenerator 6, and then the supercritical carbon dioxide working medium after backheat is again introduced into the heat extractor 3 of the tower thermal-arrest subsystem of high temperature.Wherein, endothermic tube 13 absorbs the solar energy from parabolic groove type mirror field 13, adds the supercritical carbon dioxide working medium of thermal shunt.
Referring once again to Fig. 1, Fig. 1 is the schematic diagram of the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to the embodiment of the present invention 1, and this system includes: heliostat field 1, tower 2, heat extractor 3, turbine 4, electromotor 5, high temperature regenerator 6, cryogenic regenerator 7, blender 8, cooler 9, compressor 10, diverter 11, parabola groove mirror field 12 and endothermic tube 13. idiographic flow is: heliostat field 1 collect too can radiant energy, absorbed by heat extractor 3 and be converted into heat energy, supercritical carbon dioxide working medium in heating heat extractor 3, the working medium of High Temperature High Pressure enters turbine 4 expansion work, supercritical working medium after expansion sequentially enters the low-pressure side of high temperature regenerator 6, the low-pressure side of cryogenic regenerator 7, cooler 9, through a series of coolings, supercritical working medium is close to critical state, enter back into compressor 10 to compress, the outlet of compressor 10 is connected with diverter 11, High-pressure supercritical working medium is after diverter 11 taps, one tunnel enters the high-pressure side backheat of cryogenic regenerator 7 and heats up, one tunnel is heated through the endothermic tube 13 of low temperature slot type collecting system, the two reaches identical temperature at the entrance of blender 8, after the mixing of blended device 8, enter the high-pressure side backheat of high temperature regenerator 6, working medium after backheat enters back into heat extractor 3 and absorbs heat, complete a circulation.
Refer to the schematic diagram of the supercritical carbon dioxide electricity generation system that Fig. 2, Fig. 2 are the heat collection combined driving of groove tower according to the embodiment of the present invention 2. This system includes: heliostat field 1, tower 2, heat extractor 3, turbine 4, electromotor 5, high temperature regenerator 6, cryogenic regenerator 7, blender 8, cooler 9, compressor 10, diverter 11, parabola groove mirror field 12, endothermic tube 13, cryogenic heat exchanger 14, high-temperature heat-exchanging 15, the cold tank 16 of high-temperature heat accumulation device, the hot tank 17 of high-temperature heat accumulation device, the hot tank 18 of low-temperature heat accumulating device, the cold tank 19 of low-temperature heat accumulating device and pump 20,21,22,23. Idiographic flow is: solar radiation gathers on heat extractor 3 and endothermic tube 13 through heliostat field 1 and parabola groove mirror field 12, and 3 and 13 respectively with fused salt and conduction oil (or fused salt) for heat absorption working medium. High-temperature molten salt enters high-temperature heat-exchanging 15 after flowing through the hot tank 17 of high-temperature heat accumulation device, enters the cold tank 16 of high-temperature heat accumulation device after heat release; The conduction oil (or fused salt) flowed out from endothermic tube 13 enters into cryogenic heat exchanger 14 through the hot tank 18 of low-temperature heat accumulating device, enters the cold tank 19 of low-temperature heat accumulating device after heat release. Fused salt and conduction oil (or fused salt) after heat release enter in heat extractor 3 and endothermic tube 13 respectively after pump pressure-raising, the solar energy that absorption heliostat field and parabola groove Jing Chang collect. Supercritical carbon dioxide in supercritical carbon dioxide Brayton cycle electricity generation system in high-temperature heat-exchanging 15 with fused salt generation heat exchange, working medium is heated to the inlet temperature 550 DEG C of turbine 4; The supercritical carbon dioxide of High Temperature High Pressure is expansion work in turbine 4, a part of merit drives electromotor 5 to generate electricity, another part is for the compression power consumption of compressor 10, high temperature refrigerant after expansion respectively enters high temperature regenerator 6 and the low-pressure side of cryogenic regenerator 7, high-pressure side carbon dioxide is carried out backheat, cool down then through cooler 9, make the temperature of supercritical carbon dioxide close to critical temperature, enter back into compressor 10; In compressor 10, supercritical carbon dioxide is compressed to 20MPa.In order to cryogenic regenerator 7 is carried out heat balance, improve heat exchange efficiency, control cryogenic regenerator 7 high-pressure side and the mass flow of low-pressure side working medium, thus the working medium after compression was tapped by diverter 11 before entering cryogenic regenerator 7, wherein the working medium of about 64% enters the high-pressure side of cryogenic regenerator 7, and carrying out heat exchange with low-pressure side working medium, remaining working medium enters the same conduction oil of cryogenic heat exchanger 14 (or fused salt) and carries out heat exchange. In the outlet of cryogenic regenerator 7, the supercritical carbon dioxide of two stock streams reaches identical temperature, enters the further backheat of high temperature regenerator 6, enter back into high-temperature heat-exchanging 15 and realize a circulation after blended device 8 mix homogeneously.
Embodiment 1 and 2 is simulated, and in system, the thermodynamic parameter of main streams is as shown in table 1, and when turbine entrance is 550 DEG C, the clean generating efficiency of solar energy reaches 26.9%.
Major parameter in table 1 embodiment
Slot type proposed by the invention and tower collecting system combine supercritical carbon dioxide Brayton cycle electricity generation system and the method for driving, simple Brayton cycle and recompression Brayton cycle have been improved, add low temperature slot type thermal-arrest and heating system, instead of recompression machine, while reducing compression power consumption, make heat recovery process cold and hot side coupling more reasonable, significantly reduce heat recovery process irreversible loss.
Particular embodiments described above; the purpose of the present invention, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only specific embodiments of the invention; it is not limited to the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.

Claims (10)

1. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower, it is characterised in that this system includes the tower thermal-arrest subsystem of high temperature, low temperature slot type thermal-arrest subsystem and supercritical carbon dioxide Brayton cycle power generation sub-system, wherein:
The tower thermal-arrest subsystem of high temperature, as high temperature heat source, is the main source of system input energy, is used for heating supercritical carbon dioxide fluid, promote the acting ability of supercritical carbon dioxide;
Low temperature slot type thermal-arrest subsystem, as auxiliary thermal source, the backheat for making up high-pressure side working medium is not enough, improves the heat exchange efficiency of system;
Supercritical carbon dioxide Brayton cycle power generation sub-system, for utilizing low-grade thermal source to promote the heat exchange efficiency of system, reduces the heat loss caused greatly in regenerator due to high-pressure side and low-pressure side heat transfer temperature difference.
2. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 1, it is characterized in that, the tower thermal-arrest subsystem of described high temperature includes heliostat field (1), tower (2) and heat extractor (3), wherein, heat extractor (3) is positioned at the top of tower (2), entrance is connected to the high pressure side outlet of the high temperature regenerator (6) of supercritical carbon dioxide Brayton cycle power generation sub-system, and outlet is connected to the turbine (4) of supercritical carbon dioxide Brayton cycle power generation sub-system; Heat extractor (3) absorbs from the solar energy of heliostat field (1), heats the supercritical carbon dioxide working medium through therein to the inlet temperature of the turbine (4) of supercritical carbon dioxide Brayton cycle power generation sub-system.
3. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 1, it is characterized in that, described low temperature slot type thermal-arrest subsystem includes endothermic tube (13) and parabola groove Jing Chang (12), wherein, endothermic tube (13) absorbs the solar energy from parabolic groove type mirror field (12), adds the supercritical carbon dioxide working medium of thermal shunt;The entrance of endothermic tube (13) is connected to the diverter (11) of supercritical carbon dioxide Brayton cycle power generation sub-system, and outlet is connected to the entrance of the blender (8) of supercritical carbon dioxide Brayton cycle power generation sub-system.
4. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 1, it is characterized in that, described supercritical carbon dioxide Brayton cycle power generation sub-system includes turbine (4), electromotor (5), high temperature regenerator (6), cryogenic regenerator (7), blender (8), cooler (9), compressor (10) and diverter (11), wherein, supercritical carbon dioxide working medium after being heated by heat extractor (3), enter turbine (4) and in turbine (4) expansion work, then the low-pressure side of high temperature regenerator (6) is sequentially entered, low-pressure side and the cooler (9) of cryogenic regenerator (7) cool down, through above-mentioned a series of coolings, supercritical carbon dioxide working medium, close to critical state, forms High-pressure supercritical carbon dioxide working medium after entering back into compressor (10) compression, the same diverter of the outlet (11) of compressor (10) is connected, High-pressure supercritical carbon dioxide working medium is after diverter (11) taps, one tunnel enters the high-pressure side of cryogenic regenerator (7), one tunnel enters blender (8) after the endothermic tube (13) of low temperature slot type collecting system heats, and the high pressure side outlet of cryogenic regenerator (7) is connected to blender (8), the mixed High-pressure supercritical carbon dioxide working medium of blended device (8) carries out backheat through high pressure side inlet entrance high temperature regenerator (6) of high temperature regenerator (6), and the supercritical carbon dioxide working medium after backheat is again introduced into the heat extractor (3) of the tower thermal-arrest subsystem of high temperature.
5. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 4, it is characterized in that, described endothermic tube (13) is for adding the supercritical carbon dioxide working medium of thermal shunt so that it is temperature is identical with the temperature of the supercritical carbon dioxide working medium heated through cryogenic regenerator (7).
6. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 4, it is characterized in that, the entrance of described compressor (10) is connected to cooler (9), outlet is connected to diverter (11), for promoting the pressure of supercritical carbon dioxide working medium, form High-pressure supercritical carbon dioxide working medium; It is compressed by compressor (10) at the Near The Critical Point of carbon dioxide working medium, makes full use of carbon dioxide in the little advantage of Near The Critical Point compressibility, reduces compressor power consumption.
7. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 4, it is characterized in that, described diverter (11) is for being divided into two-way by High-pressure supercritical carbon dioxide working medium, one tunnel is directly entered the high-pressure side of cryogenic regenerator (7) and carries out backheat, another road enters endothermic tube (13), it is ensured that the ratio of the mass flow of cryogenic regenerator (7) high-pressure side working medium and the mass flow of low-pressure side working medium meets heat transfer requirements.
8. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 4, it is characterized in that, the outlet of described blender (8) is connected to the high pressure side inlet of high temperature regenerator (6), for working medium mix homogeneously working medium and the endothermic tube (13) of cryogenic regenerator (7) high pressure side outlet exported.
9. a supercritical carbon dioxide electricity-generating method for the heat collection combined driving of groove tower, is applied to the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to any one of claim 1 to 8, it is characterised in that the method includes:
Heat extractor (3) absorbs the solar energy from heliostat field (1), heats the supercritical carbon dioxide working medium through therein;
Supercritical carbon dioxide working medium after being heated by heat extractor (3), enter turbine (4) and in turbine (4) expansion work, then sequentially enter the low-pressure side of high temperature regenerator (6), the low-pressure side of cryogenic regenerator (7) and cooler (9) and cool down;
After supercooling, supercritical carbon dioxide working medium, close to critical state, forms High-pressure supercritical carbon dioxide working medium after entering back into compressor (10) compression;
High-pressure supercritical carbon dioxide working medium is after diverter (11) taps, one tunnel enters the high-pressure side of cryogenic regenerator (7), and a road enters blender (8) after the endothermic tube (13) of low temperature slot type collecting system heats;
The mixed High-pressure supercritical carbon dioxide working medium of blended device (8) carries out backheat through high pressure side inlet entrance high temperature regenerator (6) of high temperature regenerator (6), and then the supercritical carbon dioxide working medium after backheat is again introduced into the heat extractor (3) of the tower thermal-arrest subsystem of high temperature.
10. the supercritical carbon dioxide electricity-generating method of the heat collection combined driving of groove tower according to claim 9, it is characterized in that, described endothermic tube (13) absorbs the solar energy from parabolic groove type mirror field (12), adds the supercritical carbon dioxide working medium of thermal shunt.
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CN107131017A (en) * 2017-04-27 2017-09-05 西安交通大学 Circulation therrmodynamic system and control method based on supercritical carbon dioxide axial flow compressor Yu axial-flow turbine coaxial configuration
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CN112832882A (en) * 2021-01-27 2021-05-25 中冶华天南京工程技术有限公司 Heating furnace energy-saving system based on supercritical carbon dioxide and operation method

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