CN105673107B - The supercritical carbon dioxide electricity generation system and method for the heat collection combined driving of groove tower - Google Patents
The supercritical carbon dioxide electricity generation system and method for the heat collection combined driving of groove tower Download PDFInfo
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- CN105673107B CN105673107B CN201610036862.9A CN201610036862A CN105673107B CN 105673107 B CN105673107 B CN 105673107B CN 201610036862 A CN201610036862 A CN 201610036862A CN 105673107 B CN105673107 B CN 105673107B
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- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
A kind of the supercritical carbon dioxide electricity generation system and method for the heat collection combined driving of groove tower, the system include 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.The tower thermal-arrest subsystem of high temperature is the main source of system input energy, for heating supercritical carbon dioxide fluid, lifts the acting ability of supercritical carbon dioxide as high temperature heat source；Low temperature slot type thermal-arrest subsystem, for making up the backheat deficiency of high-pressure side working medium, improves the heat exchange efficiency of system as auxiliary thermal source；Supercritical carbon dioxide Brayton cycle power generation sub-system is used for the heat exchange efficiency using low-grade thermal source lifting system, reduce in regenerator due to high-pressure side and low-pressure side heat transfer temperature difference are big and caused by heat loss.The present invention takes full advantage of overcritical working medium and lacks this characteristic in Near The Critical Point work done during compression, reduces compression power consumption；Compared to recompression Brayton cycle, recompression machine is eliminated, simplifies system architecture.
Description
Technical field
The present invention relates to regenerative resource applied technical field, overcritical the two of especially a kind of heat collection combined driving of groove tower
Carbonoxide electricity generation system and method.
Background technology
The method for improving solar energy power plant efficiency has a lot, and most effective of which method is to improve power cycle, super to face
Boundary's carbon dioxide Brayton cycle is arisen at the historic moment.
Supercritical carbon dioxide is a kind of preferable working medium for enclosed TRT, and its cost is very low, non-combustible, nothing
Corrosivity, chemical property are stable, can be applied not only to solar energy thermal-power-generating power cycle, can also be applied to nuclear energy,
Heat energy and the dynamical system that fossil fuel is thermal source.
The density of supercritical carbon dioxide is larger, and the size of turbomachinery is smaller, compared to traditional power circulating device, with
Supercritical carbon dioxide for working medium power cycle structure closely, it will reduce the floor space of power set.In addition,
Because supercritical carbon dioxide is not in phase transition process in the circulating cycle, the Temperature Matching degree with thermal source is good, improves heat exchange effect
Rate；Meanwhile turbomachinery is also because working medium increases the service life without phase transition process.Because carbon dioxide is near point of proximity
The density of (31.1 DEG C, 7.39MPa) is very big, and compressibility is smaller, and the power of compressor is relatively low, and it is super that the power consumption of compressor is smaller
The main reason for critical carbon dioxide Brayton cycle efficiency is higher；When turbine-inlet temperature is 650 DEG C, the cycling hot of system
Efficiency can reach 50%.It is expected that future, with the application of high-temperature material, the inlet temperature of high-performance turbine can reach 700
DEG C, the system circulation thermal efficiency will be close to 53% at that time.
Supercritical carbon dioxide Brayton cycle mainly has two kinds of endless form at present, be respectively simple Brayton cycle and
Recompress Brayton cycle.For simple Brayton cycle because the regenerator internal heat temperature difference is larger, irreversible loss is larger, compares
Traditional endless form, the raising of cycle efficieny and unobvious.And it is then more consumption part compressions to recompress Brayton cycle
Work(, greatly reduce heat recovery process irreversible loss.The cycle efficieny of system is obviously improved, but recompresses drawing for machine
Enter, make the structure of system relative complex, system building cost increases.
The supercritical carbon dioxide electricity generation system and method for a kind of heat collection combined driving of groove tower proposed by the present invention, using not
The mode utilized with grade external heat source complementation solves regenerator heat exchange mismatch problem, while improving the thermal efficiency, letter
Change the structure of system, reduce the equipment investment of system and the land area of solar energy thermal-power-generating factory.The present invention is further
Reduce solar energy thermal-power-generating cost and provide theoretical foundation, play an important roll to solar energy thermal-power-generating development.
The content of the invention
(1) technical problems to be solved
At present, although simply closely, economy is higher, thermal effect for the structure of supercritical carbon dioxide Brayton cycle
Rate improves and unobvious, this be due to the heat transfer temperature difference of regenerator mesohigh side and low-pressure side working medium it is excessive caused by；Recompression
Bretton is provided with high/low temperature regenerator, and sets up recompression machine, solves the problems, such as that regenerator heat transfer temperature difference is big, but disappear more
Partial shrinkage work(is consumed, system is more complicated.The present invention is in view of the above-mentioned problems, propose a kind of the super of heat collection combined driving of groove tower
Critical carbon dioxide electricity generation system and method, using different grade solar heat-collection complementation Application ways, release energy in regenerator
Put side and receiving side more matches, while system structural compactness is kept, improve cycle efficieny.
(2) technical scheme
In order to solve the above technical problems, the invention provides a kind of supercritical carbon dioxide of heat collection combined driving of groove tower hair
Electric system and method, the system include 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, it is the master of system input energy as high temperature heat source
Source is wanted, for heating supercritical carbon dioxide fluid, lifts the acting ability of supercritical carbon dioxide；Low temperature slot type thermal-arrest
System, as auxiliary thermal source, for making up the backheat deficiency of high-pressure side working medium, improve the heat exchange efficiency of system；Overcritical dioxy
Change carbon Bretton circulating generation subsystem, for the heat exchange efficiency using low-grade thermal source lifting system, reduce in regenerator
Due to high-pressure side and low-pressure side heat transfer temperature difference are big and caused by heat loss.
In such scheme, the tower thermal-arrest subsystem of high temperature includes heliostat field 1, tower 2 and heat dump 3, wherein, heat absorption
Device 3 is located at the top of tower 2, and entrance is connected to the high temperature regenerator 6 of supercritical carbon dioxide Brayton cycle power generation sub-system
High pressure side outlet, outlet are connected to the turbine 4 of supercritical carbon dioxide Brayton cycle power generation sub-system；Heat dump 3, which absorbs, to be come
From the solar energy of heliostat field 1, heating is by the supercritical carbon dioxide working medium of therein to supercritical carbon dioxide mine-laying
The inlet temperature of the turbine 4 of circulating generation subsystem.
In such scheme, the low temperature slot type thermal-arrest subsystem includes endothermic tube 13 and parabola groove mirror field 12, wherein, heat absorption
Pipe 13 absorbs the solar energy from parabolic groove type mirror field 12, heats the supercritical carbon dioxide working medium of shunting；Endothermic tube 13 enters
Mouth is connected to the current divider 11 of supercritical carbon dioxide Brayton cycle power generation sub-system, and outlet is connected to supercritical carbon dioxide
The entrance of the blender 8 of Brayton cycle power generation sub-system.
In such scheme, the supercritical carbon dioxide Brayton cycle power generation sub-system includes turbine 4, generator 5, height
Warm regenerator 6, cryogenic regenerator 7, blender 8, cooler 9, compressor 10 and current divider 11 wherein, after being heated by heat dump 3
Supercritical carbon dioxide working medium, into turbine 4 and the expansion work in turbine 4, then sequentially enter the low of high temperature regenerator 6
Pressure side, the low-pressure side of cryogenic regenerator 7 and cooler 9 are cooled down；By a series of above-mentioned coolings, supercritical carbon dioxide work
Matter enters back into after compressor 10 compresses close to critical condition and forms High-pressure supercritical carbon dioxide working medium；The outlet of compressor 10
It is connected with current divider 11, High-pressure supercritical carbon dioxide working medium is after the shunting of current divider 11, all the way into cryogenic regenerator 7
High-pressure side, enter blender 8, the high pressure of cryogenic regenerator 7 after the endothermic tube 13 of low temperature slot type collecting system heats all the way
Side outlet is connected to blender 8；Blended mixed height of the High-pressure supercritical carbon dioxide working medium through high temperature regenerator 6 of device 8
Press side entrance to enter high temperature regenerator 6 and carry out backheat, then the supercritical carbon dioxide working medium after backheat is again introduced into high temperature tower
The heat dump 3 of formula collection thermal sub-system.
In such scheme, the endothermic tube 13 is used for the supercritical carbon dioxide working medium for heating shunting, makes its temperature with warp
The temperature for crossing the supercritical carbon dioxide working medium of the heating of cryogenic regenerator 7 is identical.
In such scheme, the entrance of the compressor 10 is connected to cooler 9, and outlet is connected to current divider 11, for carrying
The pressure of supercritical carbon dioxide working medium is risen, forms High-pressure supercritical carbon dioxide working medium；Compressor 10 is in carbon dioxide working medium
Near The Critical Point it is compressed, make full use of carbon dioxide to compress small advantage in Near The Critical Point, reduce compressor
Power consumption.
In such scheme, the current divider 11 is used to High-pressure supercritical carbon dioxide working medium being divided into two-way, all the way directly
Backheat is carried out into the high-pressure side of cryogenic regenerator 7, another way enters endothermic tube 13, ensures cryogenic regenerator high-pressure side and low pressure
The working medium mass flow ratio of side meets heat transfer requirements.
In such scheme, the outlet of the blender 8 is connected to the entrance of high temperature regenerator 6, for by cryogenic regenerator 7
The working medium of working medium and endothermic tube 13 outlet of high pressure side outlet is well mixed.
To reach above-mentioned purpose, present invention also offers a kind of generating of the supercritical carbon dioxide of heat collection combined driving of groove tower
Method, this method include：Heat dump 3 absorbs the solar energy from heliostat field 1, and the overcritical dioxy of therein is passed through in heating
Change carbon working medium；Supercritical carbon dioxide working medium after being heated by heat dump 3, into turbine 4 and the expansion work in turbine 4, so
The low-pressure side of high temperature regenerator 6, the low-pressure side of cryogenic regenerator 7 and cooler 9 is sequentially entered afterwards to be cooled down；Through supercooling
Afterwards, supercritical carbon dioxide working medium enters back into after compressor 10 compresses close to critical condition and forms High-pressure supercritical carbon dioxide
Working medium；High-pressure supercritical carbon dioxide working medium is after the shunting of current divider 11, all the way into the high-pressure side of cryogenic regenerator 7, all the way
Enter blender 8 after the endothermic tube 13 of low temperature slot type collecting system heats；The blended mixed High-pressure supercritical two of device 8
High pressure side inlet of the carbonoxide working medium through high temperature regenerator 6 enters high temperature regenerator 6 and carries out backheat, then overcritical after backheat
Carbon dioxide working medium is again introduced into the heat dump 3 of the tower thermal-arrest subsystem of high temperature.
In such scheme, the endothermic tube 13 absorbs the solar energy from parabolic groove type mirror field 12, heats the super of shunting and faces
Boundary's carbon dioxide working medium.
(3) beneficial effect
From above-mentioned technical scheme as can be seen that the invention has the advantages that：
1st, the supercritical carbon dioxide electricity generation system and method for the heat collection combined driving of groove tower proposed by the invention, by high temperature
High temperature heat source of the tower collecting system as carbon dioxide Brayton cycle electricity generation system, it is the main next of system dynamic circulation
Source；Auxiliary thermal source using low temperature slot type collecting system as system, it is the work through cryogenic regenerator backheat after being shunted for heating
Mass flow, the heat balance of cryogenic regenerator is maintained, embodying can cascade utilization theory.
2nd, the supercritical carbon dioxide electricity generation system and method for the heat collection combined driving of groove tower proposed by the invention, is eliminated
Recompression machine, compared to existing recompression Brayton Cycle system, working medium does not shunt before cooler is entered, but is compressing
Machine outlet manifold.So all working medium is all to enter compressor compresses in Near The Critical Point, takes full advantage of overcritical dioxy
Change characteristic of the carbon in " high density " and " intimate incompressible " of Near The Critical Point, reduce compression power consumption, improve system
Acting ability, generated energy are improved obviously, and optimize systematic function.
3rd, the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower proposed by the invention and method, use are low
Warm slot type collecting system replaces recompression machine, reduces compression power consumption, while solves cryogenic regenerator energy release side heat
The problem of insufficient, obtain the cryogenic regenerator identical heat exchange efficiency with recompression Brayton Cycle system.It is of the invention abundant
The advantages of make use of parabola groove collecting system, tower collecting system, and the solar energy heating to different grades has carried out step profit
With i.e. parabola groove Jing Chang is respectively used to the low temperature backheat and overheat of supercritical carbon dioxide with the solar energy that heliostat field is collected into
Process.
Brief description of the drawings
Fig. 1 is showing for 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
It is intended to.
Fig. 2 is showing for 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
It is intended to.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.
As shown in figure 1, Fig. 1 is the supercritical carbon dioxide hair of the heat collection combined driving of groove tower according to the embodiment of the present invention 1
The schematic diagram of electric system, the system include low temperature slot type thermal-arrest subsystem, the tower thermal-arrest subsystem of high temperature and overcritical titanium dioxide
Carbon Bretton circulating generation subsystem, wherein：Low temperature slot type thermal-arrest subsystem, as auxiliary thermal source, for making up high-pressure side work
The backheat deficiency of matter, the heat exchange efficiency of system is improved, reduced in regenerator because high-pressure side and low-pressure side heat transfer temperature difference are made greatly
Into heat loss；The tower thermal-arrest subsystem of high temperature, it is the main source of system input energy, for heating as high temperature heat source
Supercritical carbon dioxide fluid, lift the acting ability of supercritical carbon dioxide；Supercritical carbon dioxide Brayton cycle generates electricity
Subsystem, for the interior energy of high-temperature supercritical carbon dioxide to be converted into electric energy.
The tower thermal-arrest subsystem of high temperature includes heliostat field 1, tower 2 and heat dump 3, wherein, heat dump 3 is located at the top of tower 2
Portion, entrance are connected to the high pressure side outlet of the high temperature regenerator 6 of supercritical carbon dioxide Brayton cycle power generation sub-system, outlet
It is connected to the turbine 4 of supercritical carbon dioxide Brayton cycle power generation sub-system；Heat dump 3 is absorbed from heliostat field 1 too
It is positive can, heating is by the supercritical carbon dioxide working medium of therein to supercritical carbon dioxide Brayton cycle power generation sub-system
Turbine 4 inlet temperature.
Low temperature slot type thermal-arrest subsystem includes endothermic tube 13 and parabola groove mirror field 12, wherein, endothermic tube 13 is absorbed from throwing
The solar energy of thing slot type mirror field 12, heat the supercritical carbon dioxide working medium of shunting；The entrance of endothermic tube 13 is connected to overcritical
The current divider 11 of carbon dioxide Brayton cycle power generation sub-system, outlet are connected to the generating of supercritical carbon dioxide Brayton cycle
The entrance of the blender 8 of subsystem.
Supercritical carbon dioxide Brayton cycle power generation sub-system includes turbine 4, generator 5, high temperature regenerator 6, low temperature
Regenerator 7, blender 8, cooler 9, compressor 10 and current divider 11, wherein, the overcritical titanium dioxide after being heated by heat dump 3
Carbon working medium, into turbine 4 and the expansion work in turbine 4, then sequentially enter low-pressure side, the low temperature backheat of high temperature regenerator 6
The low-pressure side and cooler 9 of device 7 are cooled down；By a series of above-mentioned coolings, supercritical carbon dioxide working medium is close to critical shape
State, enter back into after compressor 10 compresses and form High-pressure supercritical carbon dioxide working medium；The outlet of compressor 10 is the same as the phase of current divider 11
Connection, High-pressure supercritical carbon dioxide working medium is after the shunting of current divider 11, all the way into the high-pressure side of cryogenic regenerator 7, all the way
Enter blender 8 after the endothermic tube 13 of low temperature slot type collecting system heats, the high pressure side outlet of cryogenic regenerator 7 is connected to
Blender 8；High pressure side inlet of the blended mixed High-pressure supercritical carbon dioxide working medium of device 8 through high temperature regenerator 6 enters
High temperature regenerator 6 carries out backheat, and then the supercritical carbon dioxide working medium after backheat is again introduced into the tower thermal-arrest subsystem of high temperature
Heat dump 3.
In Fig. 1, endothermic tube 13 is used for the supercritical carbon dioxide working medium for heating shunting, makes its temperature is same to pass through low temperature backheat
The temperature for the supercritical carbon dioxide working medium that device 7 heats is identical.The entrance of compressor 10 is connected to condenser 9, and outlet is connected to
Current divider 11, for lifting the pressure of supercritical carbon dioxide working medium, form High-pressure supercritical carbon dioxide working medium；Compressor 10
It is compressed in the Near The Critical Point of carbon dioxide working medium, makes full use of carbon dioxide to be compressed in Near The Critical Point small excellent
Gesture, reduce compressor power consumption.Current divider 11 is used to High-pressure supercritical carbon dioxide working medium being divided into two-way, is directly entered all the way low
The high-pressure side of warm regenerator 7 carries out backheat, and another way enters endothermic tube 13, ensures the work of cryogenic regenerator high-pressure side and low-pressure side
Matter mass flow ratio meets heat transfer requirements.The outlet of blender 8 is connected to the high pressure side inlet of high temperature regenerator 6, for inciting somebody to action
The working medium that the working medium and endothermic tube 13 that cryogenic regenerator 7 exports export is well mixed.
The supercritical carbon dioxide of the heat collection combined driving of groove tower based on the foundation embodiment of the present invention 1 shown in Fig. 1 generates electricity
The schematic diagram of system, present invention also offers a kind of slot type and the supercritical carbon dioxide mine-laying of tower collecting system joint driving
Circulating generation method, this method include following technological process：Heat dump 3 absorbs the solar energy from heliostat field 1, heating warp
Cross the supercritical carbon dioxide working medium of therein；Supercritical carbon dioxide working medium after being heated by heat dump 3, into turbine 4
And the expansion work in turbine 4, then sequentially enter the low-pressure side of high temperature regenerator 6, the low-pressure side of cryogenic regenerator 7 and cooling
Device 9 is cooled down；After supercooling, supercritical carbon dioxide working medium enters back into shape after compressor 10 compresses close to critical condition
Into High-pressure supercritical carbon dioxide working medium；High-pressure supercritical carbon dioxide working medium is after the shunting of current divider 11, all the way into low temperature
The high-pressure side of regenerator 7, enter blender 8 after backheat, heated all the way by the endothermic tube 13 of low temperature slot type collecting system laggard
Enter blender 8；Blended mixed high pressure side inlet of the High-pressure supercritical carbon dioxide working medium through high temperature regenerator 6 of device 8 enters
Enter high temperature regenerator 6 and carry out backheat, then the supercritical carbon dioxide working medium after backheat is again introduced into the tower thermal-arrest subsystem of high temperature
The heat dump 3 of system.Wherein, endothermic tube 13 absorbs the solar energy from parabolic groove type mirror field 13, heats the overcritical dioxy of shunting
Change carbon working medium.
Referring once again to Fig. 1, Fig. 1 is the overcritical titanium dioxide of the heat collection combined driving of groove tower according to the embodiment of the present invention 1
The schematic diagram of carbon electricity generation system, the system include：Heliostat field 1, tower 2, heat dump 3, turbine 4, generator 5, high temperature regenerator
6th, cryogenic regenerator 7, blender 8, cooler 9, compressor 10, current divider 11, parabola groove mirror field 12 and endothermic tube 13.Specific stream
Cheng Wei：Heliostat field 1 collect too can radiation energy, absorbed by heat dump 3 and be converted into heat energy, heat super facing in heat dump 3
Boundary's carbon dioxide working medium, the working medium of HTHP enter the expansion work of turbine 4, and the overcritical working medium after expansion sequentially enters high temperature
The low-pressure side of regenerator 6, the low-pressure side of cryogenic regenerator 7, cooler 9, by a series of coolings, overcritical working medium is close to critical
State, enter back into compressor 10 and compress, the outlet of compressor 10 is connected with current divider 11, and High-pressure supercritical working medium is through current divider 11
After shunting, all the way into the high-pressure side backheat heating of cryogenic regenerator 7, all the way by the endothermic tube 13 of low temperature slot type collecting system
Heating, the two reaches identical temperature in the entrance of blender 8, after blended device 8 mixes, into the high pressure of high temperature regenerator 6
Side backheat, the working medium after backheat enter back into heat dump 3 and absorbed heat, and complete a circulation.
Fig. 2 is refer to, Fig. 2 is the supercritical carbon dioxide hair of the heat collection combined driving of groove tower according to the embodiment of the present invention 2
The schematic diagram of electric system.The system includes：It is heliostat field 1, tower 2, heat dump 3, turbine 4, generator 5, high temperature regenerator 6, low
Warm regenerator 7, blender 8, cooler 9, compressor 10, current divider 11, parabola groove mirror field 12, endothermic tube 13, cryogenic heat exchanger
14th, 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, hot tank 18, the low temperature of low-temperature heat accumulating device
The cold tank 19 and pump 20,21,22,23 of storage heater.Idiographic flow is：Solar radiation is poly- through heliostat field 1 and parabola groove mirror field 12
Collect on heat dump 3 and endothermic tube 13,3 and 13 be respectively heat absorption working medium with fused salt and conduction oil (or fused salt).High-temperature molten salt stream
Enter high-temperature heat-exchanging 15 after the hot tank 17 of high-temperature heat accumulation device, the cold tank 16 of high-temperature heat accumulation device is entered after heat release；From endothermic tube
Hot tank 18 of the conduction oil (or fused salt) through low-temperature heat accumulating device of 13 outflows enters cryogenic heat exchanger 14, and Low Temperature Storage is entered after heat release
The cold tank 19 of hot device.Fused salt and conduction oil (or fused salt) after heat release enter heat dump 3 and endothermic tube 13 after pump pressure-raising respectively
In, absorb the solar energy that heliostat field and parabola groove Jing Chang are collected into.In supercritical carbon dioxide Brayton cycle electricity generation system
Supercritical carbon dioxide heat exchange occurs with fused salt in high-temperature heat-exchanging 15, working medium is heated to the inlet temperature of turbine 4
550℃；The supercritical carbon dioxide of HTHP expansion work in turbine 4, a part of work(driving generator 5 generates electricity, another
Part is used for the compression power consumption of compressor 10, and the high temperature refrigerant after expansion respectively enters high temperature regenerator 6 and cryogenic regenerator 7
Low-pressure side, backheat is carried out to high-pressure side carbon dioxide, then cooled down through cooler 9, make the temperature of supercritical carbon dioxide is close to face
Boundary's temperature, enter back into compressor 10；In compressor 10, supercritical carbon dioxide is compressed to 20MPa.In order to low temperature backheat
Device 7 carries out heat balance, improves heat exchange efficiency, to control the mass flow of the high-pressure side of cryogenic regenerator 7 and low-pressure side working medium, because
And the working medium after compressing is shunted before cryogenic regenerator 7 is entered by current divider 11, wherein about 64% working medium enters
The high-pressure side of cryogenic regenerator 7, and exchanged heat with low-pressure side working medium, remaining working medium enters 14 same conduction oil of cryogenic heat exchanger
(or fused salt) is exchanged heat.In the outlet of cryogenic regenerator 7, the supercritical carbon dioxide of two stock streams reaches identical temperature,
Enter 6 further backheat of high temperature regenerator after blended device 8 is well mixed, enter back into high-temperature heat-exchanging 15 and realize a circulation.
Examples 1 and 2 are simulated, the thermodynamic parameter of main streams is as shown in table 1 in system, when turbine entrance is
At 550 DEG C, the net generating efficiency of solar energy reaches 26.9%.
Major parameter in the embodiment of table 1
Slot type proposed by the invention and the supercritical carbon dioxide Brayton cycle hair of tower collecting system joint driving
Electric system and method, simple Brayton cycle and recompression Brayton cycle are improved, add low temperature slot type thermal-arrest
With heating system, recompression machine is instead of, while compression power consumption is reduced, makes the cold and hot side matching of heat recovery process more reasonable,
Significantly reduce heat recovery process irreversible loss.
Particular embodiments described above, the purpose of the present invention, technical scheme and beneficial effect are carried out further in detail
Describe in detail it is bright, should be understood that the foregoing is only the present invention specific embodiment, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., it should be included in the guarantor of the present invention
Within the scope of shield.
Claims (8)
1. a kind of supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower, it is characterised in that the system includes high temperature
Tower collection thermal sub-system, 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, it is the main source of system input energy, for heating overcritical two as high temperature heat source
Carbon oxide fluid, lift the acting ability of supercritical carbon dioxide；
Low temperature slot type thermal-arrest subsystem, as auxiliary thermal source, for making up the backheat deficiency of high-pressure side working medium, improve changing for system
The thermal efficiency；
Supercritical carbon dioxide Brayton cycle power generation sub-system, for being imitated using the heat exchange of low-grade thermal source lifting system
Rate, reduce in regenerator due to high-pressure side and low-pressure side heat transfer temperature difference are big and caused by heat loss；
Wherein, low temperature slot type thermal-arrest subsystem converts solar energy into low temperature heat energy, with heating part stream of supercritical carbon dioxide
Body, make its temperature identical with the Temperature of Working of cryogenic regenerator high pressure side outlet；The tower thermal-arrest subsystem of high temperature turns solar energy
High temperature heat is turned to, the on high-tension side supercritical carbon dioxide fluid of high temperature regenerator is come from heating；
The supercritical carbon dioxide Brayton cycle power generation sub-system includes turbine (4), generator (5), high temperature regenerator
(6), cryogenic regenerator (7), blender (8), cooler (9), compressor (10) and current divider (11), wherein, by heat dump (3)
Supercritical carbon dioxide working medium after heating, into turbine (4) and the expansion work in turbine (4), then sequentially enter high temperature
The low-pressure side of regenerator (6), the low-pressure side of cryogenic regenerator (7) and cooler (9) are cooled down；By above-mentioned a series of cold
But, supercritical carbon dioxide working medium forms High-pressure supercritical titanium dioxide close to critical condition after entering back into compressor (10) compression
Carbon working medium；The same current divider in outlet (11) of compressor (10) is connected, and High-pressure supercritical carbon dioxide working medium is through current divider (11)
After shunting, all the way into the high-pressure side of cryogenic regenerator (7), heated all the way by the endothermic tube (13) of low temperature slot type collecting system
Enter blender (8) afterwards, the high pressure side outlet of cryogenic regenerator (7) is connected to blender (8)；Blended device (8) is mixed
High pressure side inlet of the High-pressure supercritical carbon dioxide working medium through high temperature regenerator (6) enters high temperature regenerator (6) and carries out backheat, warp
Supercritical carbon dioxide working medium after backheat is again introduced into the heat dump (3) of the tower thermal-arrest subsystem of high temperature.
2. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 1, it is characterised in that
The tower thermal-arrest subsystem of high temperature includes heliostat field (1), tower (2) and heat dump (3), wherein, heat dump (3) is located at tower
(2) top, entrance are connected to the high-pressure side of the high temperature regenerator (6) of supercritical carbon dioxide Brayton cycle power generation sub-system
Outlet, outlet are connected to the turbine (4) of supercritical carbon dioxide Brayton cycle power generation sub-system；Heat dump (3), which absorbs, to be come from
The solar energy of heliostat field (1), heating is by the supercritical carbon dioxide working medium of therein to supercritical carbon dioxide mine-laying
The inlet temperature of the turbine (4) of circulating generation subsystem.
3. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 1, it is characterised in that
The low temperature slot type thermal-arrest subsystem includes endothermic tube (13) and parabola groove Jing Chang (12), wherein, endothermic tube (13), which absorbs, to be come from
The solar energy of parabolic groove type mirror field (12), heat the supercritical carbon dioxide working medium of shunting；The entrance of endothermic tube (13) is connected to
The current divider (11) of supercritical carbon dioxide Brayton cycle power generation sub-system, outlet are connected to supercritical carbon dioxide Bretton
The entrance of the blender (8) of circulating generation subsystem.
4. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 1, it is characterised in that
Supercritical carbon dioxide working medium of the endothermic tube (13) for heating shunting, makes its temperature add with by cryogenic regenerator (7)
The temperature of the supercritical carbon dioxide working medium of heat is identical.
5. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 1, it is characterised in that
The entrance of the compressor (10) is connected to cooler (9), and outlet is connected to current divider (11), for lifting overcritical titanium dioxide
The pressure of carbon working medium, form High-pressure supercritical carbon dioxide working medium；Near The Critical Point of the compressor (10) in carbon dioxide working medium
It is compressed, makes full use of carbon dioxide in the small advantage of Near The Critical Point compressibility, reduction compressor power consumption.
6. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 1, it is characterised in that
The current divider (11) is used to High-pressure supercritical carbon dioxide working medium being divided into two-way, is directly entered cryogenic regenerator (7) all the way
High-pressure side carry out backheat, another way enters endothermic tube (13), ensure the mass flow of cryogenic regenerator (7) high-pressure side working medium with
The ratio of the mass flow of low-pressure side working medium meets heat transfer requirements.
7. the supercritical carbon dioxide electricity generation system of the heat collection combined driving of groove tower according to claim 1, it is characterised in that
The outlet of the blender (8) is connected to the high pressure side inlet of high temperature regenerator (6), for by cryogenic regenerator (7) high-pressure side
The working medium of working medium and endothermic tube (13) outlet of outlet is well mixed.
A kind of 8. supercritical carbon dioxide electricity-generating method of the heat collection combined driving of groove tower, applied to any one of claim 1 to 7
The supercritical carbon dioxide electricity generation system of the described heat collection combined driving of groove tower, it is characterised in that this method includes：
Heat dump (3) absorbs the solar energy from heliostat field (1), and the supercritical carbon dioxide work of therein is passed through in heating
Matter；
Supercritical carbon dioxide working medium after being heated by heat dump (3), into turbine (4) and the expansion work in turbine (4), so
The low-pressure side of high temperature regenerator (6), the low-pressure side of cryogenic regenerator (7) and cooler (9) is sequentially entered afterwards to be cooled down；
After supercooling, supercritical carbon dioxide working medium forms high pressure close to critical condition after entering back into compressor (10) compression
Supercritical carbon dioxide working medium；
High-pressure supercritical carbon dioxide working medium is after current divider (11) shunting, all the way into the high-pressure side of cryogenic regenerator (7), one
Road enters blender (8) after endothermic tube (13) heating of low temperature slot type collecting system；The endothermic tube (13), which absorbs, to be come from
The solar energy of parabolic groove type mirror field (12), heat the supercritical carbon dioxide working medium of shunting；
High pressure side inlet of the blended mixed High-pressure supercritical carbon dioxide working medium of device (8) through high temperature regenerator (6) enters
High temperature regenerator (6) carries out backheat, and then the supercritical carbon dioxide working medium after backheat is again introduced into the tower thermal-arrest subsystem of high temperature
The heat dump (3) of system.
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