CN108506177A - Solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector - Google Patents
Solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector Download PDFInfo
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- CN108506177A CN108506177A CN201810418139.6A CN201810418139A CN108506177A CN 108506177 A CN108506177 A CN 108506177A CN 201810418139 A CN201810418139 A CN 201810418139A CN 108506177 A CN108506177 A CN 108506177A
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- 238000010248 power generation Methods 0.000 title claims abstract description 73
- 239000007788 liquid Substances 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 157
- 238000009825 accumulation Methods 0.000 claims abstract description 60
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- MSSNHSVIGIHOJA-UHFFFAOYSA-N pentafluoropropane Chemical compound FC(F)CC(F)(F)F MSSNHSVIGIHOJA-UHFFFAOYSA-N 0.000 claims description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims 1
- 239000001294 propane Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 20
- 238000001816 cooling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000005338 heat storage Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
- F03G6/067—Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention relates to the solar energy overlapping organic Rankine cycle power generation systems based on gas-liquid two-phase heat collector.Including solar heat-collection and heat-accumulation circuit, level-one Organic Rankine Cycle power generation circuit and two level Organic Rankine Cycle power generation circuit.Daytime, solar irradiation was more than 400W/m2When, system is carried out at the same time thermal-arrest, stores three kinds of operational modes of heat and generating power；When night or cloudy day, system continues generating operating mode using the heat that high-temperature heat accumulation water pot stores.For two-stage Organic Rankine Cycle of the present invention all using steam turbine, 10MW or more scale applications may be implemented in system；Steam turbine, which uses, does organic working medium, and working medium is in an overheated state in expansion process, not will produce drop；Indirect heat exchange is used between heat collecting field and thermal storage unit and Organic Rankine Cycle unit, the vapor that heat collecting field generates is only heat transfer medium, does not enter turbine expansion acting, effectively reduces quality requirements of the system to thermal-arrest and accumulation of heat device of working medium.
Description
Technical field
The invention belongs to solar energy thermal-power-generating technical fields, and in particular to a kind of solar energy based on gas-liquid two-phase heat collector
Overlapping organic Rankine cycle power generation system.
Background technology
Photo-thermal power generation is an important channel for large-scale developing and utilizing solar energy.It is used different from conventional photo-thermal power station
The solar energy thermal-power-generating technology of the media such as conduction oil, fused salt, direct steam due to use water while being used as heat collecting field heat-absorbing medium,
Heat storage medium and heat to power output working medium, therefore have many advantages, such as that system structure is relatively easy, be easy to reduce cost.
There are two crucial problem is urgently to be resolved hurrily for the direct generating polynomial solar energy thermal-power-generating technology of steam：First, device of working medium exists
There are phase transformations for endothermic process in heat collector field, and the control of two-phase flow is more much more complex than single-phase flow, and the external world is too
Sun irradiation has apparent wave characteristic again.In this case, if it is desired that obtaining heat collecting field exports output superheated steam, then
The degree of superheat of steam is difficult control, therefore the stability of steam output is poor, and reliability is relatively low, so generally being adopted in practical application
Saturated vapor scheme is directly generated with relatively simple.Secondly, the heat accumulation design to match with superheated steam cycle is complex,
Generally include multistage accumulation of heat（Pre-thermal level, phase transformation grade and excessively thermal level）.The conventional hot and cold tank of fused salt, which switches operational mode, can cause very
Big heat transfer irreversible loss, and larger heat exchange area is needed, practicability is poor.Therefore still lack economical and efficient at present
Direct expanding solar heating power generation heat-storage technology.
Direct expanding solar heating generation technology based on screw expander can solve the above problems to a certain extent.With
Steam turbine is compared, and screw expander can handle gas-fluid two-phase mixture without causing mechanical damage, and start and stop are rapid.
In terms of thermodynamic behaviour, screw expander is its good variable parameter operation ability compared to the great advantage of steam turbine, this
Also it is proved by experiment by numerous scholars.For example, for the screw expander for being 5 than volume ratio built in one, when
When practical pressure ratio becomes the three times of built-in pressure ratio, reduction of the isentropic efficiency compared to maximum value only has 10%.Therefore when using spiral shell
When bar expanding machine, the steam that direct expanding solar heating electricity generation system heat collecting field generates may be at gas-liquid two-phase, and need not overheat.
Particularly, when using two-stage accumulation of heat water pot, direct expanding solar heating electricity generation system will carry out heat using different Heat release modes
Work(is converted；So that the year-round operation time of Organic Rankine Cycle increases, the heat storage capacity of system is greatly improved（With single tank system
System is compared, and heat storage capacity can be improved 5-8 times）, shorten system payback periods；And expanding machine is effectively prevented from serious inclined
From being run under conditions of design conditions, ensure system high efficiency operation.
On the other hand, screw expander has several significant drawbacks at this stage：First, single-machine capacity is smaller.Commercialized spiral shell
The single-machine capacity of bar expanding machine is generally less than 2.5 MW.It is hot if installed capacity is smaller for solar heat power generation system
The cost ratio of work(converting unit in the entire system will increase, and system economy can reduce.In consideration of it, solar energy thermal-power-generating system
System scale is usually 10MW or bigger, this brings challenge to screw expander.Second, the dry flue gas steam turbine phase with mainstream
It is more inefficient than, saturated vapor or moist steam screw expander.The isentropic efficiency of screw expander between 60%-75%, and
The isentropic efficiency of dry flue gas steam turbine is 80%-89%.
In view of the above problems, a potential solution is using based on dry organic working medium（dry organic
fluid）Steam turbine realize overlapping Rankine cycle top heat to power output.
Invention content
In order to further increase the thermodynamic property and technical feasibility of solar energy overlapping organic Rankine cycle power generation system,
The present invention provides a kind of solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector.
Solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector includes solar heat-collection and heat-accumulation
Circuit, level-one Organic Rankine Cycle power generation circuit and two level Organic Rankine Cycle power generation circuit；
The solar heat-collection and heat-accumulation circuit includes solar energy heat-collection field 1, high-temperature heat accumulation water pot 2, low-temperature heat accumulating water pot 3, low temperature
Collect heat-exchanger pump 12, middle warm water pump 13 and high temperature exchange heat water pump 14, the outlet of solar energy heat-collection field 1 is connected high-temperature heat accumulation water pot 2,
The inlet in series of solar energy heat-collection field 1 low-temperature heat accumulating water pot 3；
The level-one Organic Rankine Cycle power generation circuit include first evaporator 4, Intermediate Heat Exchanger 5, the first level steam turbine 8,
First order generator 10 and first order organic working medium pump 15, wherein first evaporator 4, the first level steam turbine 8, Intermediate Heat Exchanger
5 and the first order organic working medium pump 15 series connection form first order organic working medium circuit；
The two level Organic Rankine Cycle power generation circuit include Intermediate Heat Exchanger 5, second level condenser 6, second level evaporator 7,
Second level steam turbine 9, second level generator 11 and second level organic working medium pump 16, wherein Intermediate Heat Exchanger 5 and second level evaporation
Device 7 connects to form the organic work in the second level with the second level steam turbine 9, second level condenser 6 and the second level organic working medium pump 16 respectively
Matter circuit；
The side of the first evaporator 4 is device of working medium, and the other side of first evaporator 4 is organic working medium, device of working medium one
The first evaporator 4 of side is connected on 2 side of high-temperature heat accumulation water pot in solar heat-collection and heat-accumulation circuit, and the of organic working medium side
Level-one evaporator 4 is connected in level-one Organic Rankine Cycle power generation circuit；
The side of the second level evaporator 7 is device of working medium, and the other side of second level evaporator 7 is organic working medium, device of working medium one
The second level evaporator 7 of side is connected on 3 side of low-temperature heat accumulating water pot in solar heat-collection and heat-accumulation circuit, and the of organic working medium side
Secondary evaporimeter 7 is connected in two level Organic Rankine Cycle power generation circuit；
The both sides of the Intermediate Heat Exchanger 5 are organic working medium, and the side of Intermediate Heat Exchanger 5 is connected on level-one Organic Rankine Cycle
In power generation circuit, the other side of Intermediate Heat Exchanger 5 is connected in two level Organic Rankine Cycle power generation circuit；
Daytime, solar irradiation was more than 400W/m2When, the system is carried out at the same time thermal-arrest, stores three kinds of operational modes of heat and generating power；
When night or cloudy day, the system continues generating operating mode using the heat that high-temperature heat accumulation water pot 2 stores.
The technical solution further limited is as follows：
The entrance of the 2 lower part side of outlet connection high-temperature heat accumulation water pot of the solar energy heat-collection field 1,2 lower part of high-temperature heat accumulation water pot
The entrance of the outlet connection high temperature heat exchange water pump 14 of side, the outlet of high temperature heat exchange water pump 14 connects 4 water conservancy project of first evaporator
The entrance of matter side, the entrance of the 2 top side of outlet connection high-temperature heat accumulation water pot of 4 device of working medium side of first evaporator are high
The entrance of warm water pump 13 in the outlet connection of 2 bottom of intermediate temperature regenerator water pot, the outlet of middle warm water pump 13 is separately connected medium temperature collection hot water
The entrance of entrance and medium temperature the heat exchange water valve 19 of valve 18, the entrance of the outlet connection solar energy heat-collection field 1 of medium temperature collection hot water valve 18,
The entrance of the outlet 7 device of working medium side of connection second level evaporator of medium temperature heat exchange water valve 19,7 device of working medium side of second level evaporator
Outlet connection throttle valve 20 entrance, the entrance on 3 top of outlet connection low-temperature heat accumulating water pot of throttle valve 20, Low Temperature Storage hot water
The entrance of the outlet connection low-temperature heat collection water pump 12 of 3 bottom of tank, the outlet connection low-temperature heat collection water valve 17 of low-temperature heat collection water pump 12
Entrance, low-temperature heat collection water valve 17 outlet connection solar energy heat-collection field 1 entrance；
The entrance of the first level steam turbine 8 of outlet connection of the organic working medium side of the first evaporator 4, the first level steam turbine
The entrance of 8 outlet 5 side of connection Intermediate Heat Exchanger, the outlet connection first order organic working medium pump 15 of 5 side of Intermediate Heat Exchanger
Entrance, the entrance of the outlet connection first evaporator 4 organic working medium side of first order organic working medium pump 15；
The entrance of outlet connection the first heat exchange outlet valve 22 of 5 other side of the Intermediate Heat Exchanger, the first heat exchange outlet valve 22
The entrance of the second level steam turbine 9 of outlet connection, the organic working medium one of the outlet connection second level condenser 6 of the second level steam turbine 9
The entrance of side, the entrance of the outlet connection second level organic working medium pump 16 of the organic working medium side of second level condenser 6, the second level
Organic working medium pump 16 outlet be separately connected the first heat exchange inlet valve 21 entrance and second exchange heat inlet valve 23 entrance, first
The entrance of outlet 5 other side of connection Intermediate Heat Exchanger of heat exchange inlet valve 21, the outlet connection second of the second heat exchange inlet valve 23
The outlet connection second of the entrance of the organic working medium side of grade evaporator 7, the organic working medium side of second level evaporator 7 exchanges heat out
The entrance of mouth valve 24, the entrance of the second level steam turbine 9 of outlet connection of the second heat exchange outlet valve 24.
The solar energy heat-collection field 1 is one in paraboloid trough type heat collecting field, linear Fresnel heat collecting field, tower heat collecting field
Kind.
Organic working medium in the level-one Organic Rankine Cycle power generation circuit is one kind in toluene and pentane；The first order is steamed
Send out device 4 in 5 side of organic working medium and Intermediate Heat Exchanger organic working medium in level-one Organic Rankine Cycle power generation circuit
Organic working medium is identical.
Organic working medium in the two level Organic Rankine Cycle power generation circuit is trifluorobichloroethane（R123）With five fluorine third
Alkane（R245fa）In one kind；Organic working medium, the organic working medium in second level condenser 6 and of 5 other side of Intermediate Heat Exchanger
Organic working medium in secondary evaporimeter 7 is identical as the organic working medium in two level Organic Rankine Cycle power generation circuit.
The operating temperature of the high-temperature heat accumulation water pot 2 is 180~280 DEG C, the operating temperature of low-temperature heat accumulating water pot 3 is 30~
150℃。
The advantageous effects of the present invention compared with prior art embody in the following areas：
1. the present invention uses gas-liquid two-phase heat collector, the steam that heat collecting field generates to be condensed in high-temperature heat accumulation tank, the heat of release
For driving Organic Rankine Cycle to generate electricity.This heat collecting field direct steam generation, and generate steam enter steam turbine or
Other type expanders carry out the technical solution of heat to power output, and there is not been reported in existing solar heat power generation system.
2. the present invention is in the first stage of heat release power generation, the heat of high temperature water pot is for driving superposition type Organic Rankine Cycle
Power generation is flowed into the water of the second stage of heat release power generation, high temperature water pot in low temperature water pot, and heat is for driving bottom organic Rankine
Circulating generation.This direct-expansion-type solar heat power generation system with unique Heat release mode, only in patent application
It is had been reported that in CN201710608229.7.The present invention makes a marked difference with invention CN201710608229.7：（1 present invention
Top cycle is using steam turbine rather than screw expander, and heat to power output process has more efficient, and output power bigger etc. is excellent
Point.（2 steam turbines, which use, does organic working medium, and working medium is in an overheated state in expansion process, not will produce drop, therefore expanding machine
Efficiency be higher than wet steam turbine, and mechanical failure will not occur.There are essential distinctions in hot physical property for organic working medium and water.
It is bent in contrast to saturation temperature-entropy (T-s) of water by taking the organic working medium R123 in two level Organic Rankine Cycle power generation circuit as an example
Line is as shown in Figure 5：When since R123 expand being saturated gaseous state, hot gaseous was constantly in during acting（Black vertical line institute
Show）, and saturated vapor is constantly in gas-liquid two-phase state in expansion process（Shown in black vertical line）.Even if therefore high-temperature water
The temperature of tank fluctuates, then can also avoid generating drop in expansion process using the steam turbine for doing organic working medium.
3. the first order of the present invention and second level Organic Rankine Cycle are all using steam turbine, 10MW or more may be implemented in system
Scale application.For using wet steam turbine 10 MW systems, wet steam turbine outlet vapor humidity about 11-14%,
Isentropic efficiency of expansion reaches as high as 80% or so, and system overall power generation efficiency is about 21% when heat-collecting temperature is 250 DEG C；And work as top
When thermodynamic cycle uses the Organic Rankine Cycle based on dry working medium, steam turbine isentropic efficiency can maintain 85% or so, system hair
Electrical efficiency is 25% or more.
4. using indirect heat exchange between heat collecting field, thermal storage unit and Organic Rankine Cycle unit, the water that heat collecting field generates steams
Gas is only heat transfer medium, does not enter turbine expansion acting, effectively reduces quality of the system to thermal-arrest and accumulation of heat device of working medium
It is required that.Thermal-arrest and accumulation of heat use device of working medium, economic and environment-friendly.
Description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is that thermal-arrest, accumulation of heat and power generation mode are carried out at the same time schematic diagram.
Fig. 3 is first stage heat release power generation mode schematic diagram.
Fig. 4 is second stage heat release power generation mode schematic diagram.
Fig. 5 is saturation temperature-entropy of R123 and water（T-s curve graphs）.
Serial number in Fig. 1：Solar energy heat-collection field 1, high-temperature heat accumulation water pot 2, low-temperature heat accumulating water pot 3, first evaporator 4, in
Between heat exchanger 5, second level condenser 6, second level evaporator 7, the first level steam turbine 8, the second level steam turbine 9, the first order power generation
Machine 10, second level generator 11, low-temperature heat collection water pump 12, middle warm water pump 13, high temperature heat exchange water pump 14, first order organic working medium pump
15, the second level organic working medium pump 16, low-temperature heat collection water valve 17, medium temperature collection hot water valve 18, medium temperature heat exchange water valve 19, first exchange heat into
The mouth heat exchange heat exchange heat exchange of inlet valve 23, second of outlet valve 22, second of valve 21, first outlet valve 24, throttle valve 20.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention is further described by embodiment.
Referring to Fig. 1, the solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector includes solar energy
Heat-collection and heat-accumulation circuit, level-one Organic Rankine Cycle power generation circuit and two level Organic Rankine Cycle power generation circuit.
Solar heat-collection and heat-accumulation circuit includes solar energy heat-collection field 1, high-temperature heat accumulation water pot 2, low-temperature heat accumulating water pot 3, low temperature
It is paraboloid trough type heat collecting field to collect heat-exchanger pump 12, middle warm water pump 13 and high temperature heat exchange water pump 14, solar energy heat-collection field 1.
Level-one Organic Rankine Cycle power generation circuit include first evaporator 4, Intermediate Heat Exchanger 5, the first level steam turbine 8,
First order generator 10 and first order organic working medium pump 15, wherein first evaporator 4, the first level steam turbine 8, Intermediate Heat Exchanger
5 and the first order organic working medium pump 15 series connection form first order organic working medium circuit；The side of first evaporator 4 is device of working medium,
The other side of first evaporator 4 is organic working medium, and the first evaporator 4 of device of working medium side is connected on solar heat-collection and heat-accumulation
The first evaporator 4 of 2 side of high-temperature heat accumulation water pot in circuit, organic working medium side is connected on the power generation of level-one Organic Rankine Cycle
In circuit；Organic working medium in level-one Organic Rankine Cycle power generation circuit is toluene；Organic working medium in first evaporator 4 and
The organic working medium of 5 side of Intermediate Heat Exchanger is identical as the organic working medium in level-one Organic Rankine Cycle power generation circuit.
Two level Organic Rankine Cycle power generation circuit include Intermediate Heat Exchanger 5, second level condenser 6, second level evaporator 7,
Second level steam turbine 9, second level generator 11 and second level organic working medium pump 16, wherein Intermediate Heat Exchanger 5 and second level evaporation
Device 7 connects to form the organic work in the second level with the second level steam turbine 9, second level condenser 6 and the second level organic working medium pump 16 respectively
Matter circuit.The both sides of Intermediate Heat Exchanger 5 are organic working medium, and the side of Intermediate Heat Exchanger 5 is connected on level-one Organic Rankine Cycle
In power generation circuit, the other side of Intermediate Heat Exchanger 5 is connected in two level Organic Rankine Cycle power generation circuit.Second level evaporator 7
Side be device of working medium, the other side of second level evaporator 7 is organic working medium, and the second level evaporator 7 of device of working medium side is connected
3 side of low-temperature heat accumulating water pot in solar heat-collection and heat-accumulation circuit, the second level evaporator 7 of organic working medium side are connected on two level
In Organic Rankine Cycle power generation circuit；Organic working medium in two level Organic Rankine Cycle power generation circuit is R123；Intermediate Heat Exchanger 5
Organic working medium, the organic working medium in second level condenser 6 and the organic working medium in second level evaporator 7 of the other side are and two level
Organic working medium in Organic Rankine Cycle power generation circuit is identical.
The specific connection relation of each component of solar energy overlapping organic Rankine cycle power generation system is as follows：
The entrance of the 2 lower part side of outlet connection high-temperature heat accumulation water pot of solar energy heat-collection field 1,2 lower part side of high-temperature heat accumulation water pot
Outlet connection high temperature heat exchange water pump 14 entrance, high temperature exchange heat water pump 14 outlet connect 4 device of working medium one of first evaporator
The entrance of side, the entrance of the 2 top side of outlet connection high-temperature heat accumulation water pot of 4 device of working medium side of first evaporator, high temperature store
The entrance of warm water pump 13 in the outlet connection of 2 bottom of hot-water cylinder, the outlet of middle warm water pump 13 is separately connected medium temperature collection hot water valve 18
Entrance and medium temperature heat exchange water valve 19 entrance, medium temperature collection hot water valve 18 outlet connection solar energy heat-collection field 1 entrance, medium temperature
The entrance of the outlet 7 device of working medium side of connection second level evaporator of heat exchange water valve 19, evaporator 7 device of working medium side in the second level goes out
The entrance of mouth connection throttle valve 20, the entrance on 3 top of outlet connection low-temperature heat accumulating water pot of throttle valve 20, low-temperature heat accumulating water pot 3
The entrance of the outlet connection low-temperature heat collection water pump 12 of bottom, the outlet connection low-temperature heat collection water valve 17 of low-temperature heat collection water pump 12 enter
Mouthful, the entrance of the outlet connection solar energy heat-collection field 1 of low-temperature heat collection water valve 17；
The entrance of the first level steam turbine 8 of outlet connection of the organic working medium side of first evaporator 4, the first level steam turbine 8
The entrance of outlet 5 side of connection Intermediate Heat Exchanger, the outlet connection first order organic working medium pump 15 of 5 side of Intermediate Heat Exchanger enter
Mouthful, the entrance of the outlet 4 organic working medium side of connection first evaporator of first order organic working medium pump 15；
The entrance of outlet connection the first heat exchange outlet valve 22 of 5 other side of Intermediate Heat Exchanger, the outlet of the first heat exchange outlet valve 22
The entrance of the second level steam turbine 9 is connected, the organic working medium side of the outlet connection second level condenser 6 of the second level steam turbine 9
Entrance, the entrance of the outlet connection second level organic working medium pump 16 of the organic working medium side of second level condenser 6, the second level are organic
The outlet of working medium pump 16 is separately connected the entrance of the entrance and the second heat exchange inlet valve 23 of the first heat exchange inlet valve 21, the first heat exchange
It steams the outlet connection second level of the entrance of outlet 5 other side of connection Intermediate Heat Exchanger of inlet valve 21, the second heat exchange inlet valve 23
Send out the entrance of the organic working medium side of device 7, outlet connection the second heat exchange outlet valve of the organic working medium side of second level evaporator 7
24 entrance, the entrance of the second level steam turbine 9 of outlet connection of the second heat exchange outlet valve 24.
The operation principle of the present invention is described as follows：
（1）The such as larger than 400W/m when daytime, solar irradiation was more sufficient2, system is carried out at the same time thermal-arrest, three kinds of storage heat and generating power is transported
Row pattern is as shown in Figure 2.Low-temperature heat collection water pump 12, middle warm water pump 13, high temperature heat exchange water pump 14, first order organic working medium pump 15 and
16 operation of second level organic working medium pump, low-temperature heat collection water valve 17, medium temperature collection hot water valve 18, first stage heat exchange inlet valve 21 and the
One stage heat exchange outlet valve 22 is opened.Water at low temperature in low-temperature heat accumulating water pot 3 is via low-temperature heat collection water pump 12 and low-temperature heat collection water
Valve 17 is heated to entering high-temperature heat accumulation water pot 2 after set temperature into solar energy heat-collection field 1, a portion high-temperature water via
High temperature heat exchange water pump 14 returns to high-temperature heat accumulation water pot 2 after cooling down heat release into first evaporator 4 and is mixed with remaining high-temperature water,
The high-temperature water to cool down after mixing is heated to setting via middle warm water pump 13 and medium temperature collection hot-water valve 18 into solar energy heat-collection field 1
Again it is stored in high-temperature heat accumulation water pot 2 after temperature, by the coordinated operation of low-temperature heat collection water pump 12 and middle warm water pump 13, can begin
The high-temperature water in high-temperature heat accumulation water pot 2 is kept to maintain set temperature eventually.Dry organic working medium in first order Organic Rankine Cycle
It absorbs heat in first evaporator 4 evaporation, high temperature does organic working medium steam and enters 8 expansion work of the first level steam turbine and via the
Level-one generator 10 exports electric energy, and the first level steam turbine 8 after expansion cooling goes out dry organic working medium steam and enters intermediate heat transfer
Device 5 condenses heat release into liquid, and middle geothermal liquid is again introduced into first evaporator 4 via first order organic working medium pump 15 and completes first
Grade Organic Rankine Cycle.Dry organic working medium in the Organic Rankine Cycle of the second level is absorbed heat evaporation in Intermediate Heat Exchanger 5, and medium temperature is dry
Organic working medium steam enters 9 expansion work of the second level steam turbine and by second level generator through first stage heat exchange outlet valve 22
11 output electric energy, expansion cooling after the second level steam turbine 9 go out dry organic working medium steam enter second level condenser 6 condensation put
Heat enters Intermediate Heat Exchanger at liquid, cryogenic liquid via second level organic working medium pump 16 and first stage heat exchange imported valve 21
5 complete second level Organic Rankine Cycle.
（2）At cloudy day or night, system continues power generation mode using the heat that high-temperature heat accumulation water pot 2 stores.
As shown in figure 3, high temperature heat exchange water pump 14, first order organic working medium pump 15 and the second level are organic under first stage heat release power generation mode
Working medium pump 16 is run, and first stage heat exchange imported valve 21 and first stage heat exchange outlet valve 22 are opened.High-temperature heat accumulation water pot 2
In high-temperature water enter first evaporator 4 via high temperature heat exchange water pump 14 and cool down heat release, the middle warm water after cooling reenters
High-temperature heat accumulation water pot 2 enters the device of working medium flow of first evaporator 4 to maintain to change by adjusting the high temperature heat exchange control of water pump 14
Hot temperature drop is within 70 DEG C.The course of work of first order Organic Rankine Cycle and second level Organic Rankine Cycle and above-mentioned thermal-arrest,
It stores identical when heat and generating power Three models are operated together.
As shown in figure 4, middle warm water pump 13, second level organic working medium pump 16 are run under second stage heat release power generation mode,
Medium temperature heat exchange penstock 19,20 second stage of throttle valve heat exchange imported valve 23 and second stage heat exchange outlet valve 24 are opened.
The remaining middle warm water of high-temperature heat accumulation water pot 2 enters second level evaporator 7 and drops via middle warm water pump 13 and medium temperature heat exchange penstock 19
Warm heat release enters low-temperature heat accumulating water pot 3 via throttle valve 20, and the dry organic working medium in the Organic Rankine Cycle of the second level is in the second level
It absorbs heat and evaporates in evaporator 7, medium temperature does organic working medium steam and enters second level steamer via second stage heat exchange outlet valve 24
9 expansion work of machine simultaneously exports electric energy via second level generator 11, and 9 low exit temperature of the second level steam turbine after expansion cooling is organic
Working substance steam enters second level condenser 6 and condenses heat release into liquid, and cryogenic liquid pumps 16 and second via second level organic working medium
Stage heat exchange imported valve 23 is again introduced into second level evaporator 7, completes second level Organic Rankine Cycle.
When the present embodiment is in design conditions, relevant parameter is as follows：Direct sunlight irradiation intensity is 800W/m2, sun spoke
According to when it is 6 hours a length of, environment temperature be 25 DEG C, ambient wind velocity 2.5m/s, 8 rated generation power of the first level steam turbine be 10
The efficiency of MW, 9 rated generation power 15.3MW of the second level steam turbine, the first level steam turbine 8 and the second level steam turbine 9 is 85%, the
The efficiency of level-one generator 10 and second level generator 11 is 95%, and low-temperature heat collection water pump 12, medium temperature collection heat-exchanger pump 13, high temperature change
The efficiency of heat-exchanger pump 14, first order organic working medium pump 15 and second level organic working medium pump 16 is 80%, high-temperature heat accumulation water pot 2
Regenerator temperature is 250 DEG C, pressure 4.5MPa, and the regenerator temperature of low-temperature heat accumulating water pot 3 is 50 DEG C, pressure 1.5MPa, high temperature
A length of 4 hours when the accumulation of heat of accumulation of heat water pot 2 and low-temperature heat accumulating water pot 3, high-temperature heat accumulation water pot 2 under first stage heat release power generation mode
In water temperature be gradually down to 180 DEG C by 250 DEG C, the water temperature under second stage heat release power generation mode in high-temperature heat accumulation water pot 2 is by 180
DEG C gradually it is down to 50 DEG C, the evaporating temperature of first order Organic Rankine Cycle is 240 DEG C, the evaporation temperature of second level Organic Rankine Cycle
Degree is 150 DEG C, and the condensation temperature of first order Organic Rankine Cycle is 160 DEG C, the condensation temperature of second level Organic Rankine Cycle is
35℃；
According to the above parameter, and the European slot ET150 and Xiao Te PTR70 thermal-arrests for selecting current solar energy thermo-power station generally to use
Pipe forms solar energy heat-collection field, and result of calculation shows：The net power output of first order Organic Rankine Cycle is 9.6MW, power generation effect
Rate is 10.1%；The net power output of second level Organic Rankine Cycle is 14.6MW, generating efficiency 17.1%；Overlapping organic Rankine
The gross output of the circulatory system is 24.2MW, and total generating efficiency is 25.5%；System nominal needs solar energy heat-collection field when running
Water temperature is heated to 250 DEG C by 1 collection heat by 180 DEG C, collecting efficiency 75.7%, collector power 95.0MW, required thermal-arrest
Scene product is 156856m2.If in addition, first stage heat release power generation mode continuous service four hours, high-temperature heat accumulation water pot 2 needs
Store 4263 tons of high-temperature water；Under second stage heat release power generation mode, the remaining middle warm water of high-temperature heat accumulation water pot 2 can drive
Two level Organic Rankine Cycle is run 7.6 hours；When collecting the heat needed for accumulation of heat in four hours, additional solar energy heat-collection field is needed
50 DEG C of water at low temperature in low-temperature heat accumulating water pot 3 are heated to 250 DEG C by 1, collecting efficiency 76.1%, and required heat collecting field area is
281577m2。
Detailed result of calculation is as follows：
First order Organic Rankine Cycle：Rated generation power 10.0MW, first order organic working medium pump wasted work 414.4kW, toluene work
Mass flow amount 218.1kg/s, device of working medium flow 296.1kg/s, Endothermic power 95.0MW, generating efficiency 10.1%；
Second level Organic Rankine Cycle：Rated generation power 15.3MW, second level organic working medium pump wasted work 653.5KW, R123 work
Mass flow amount 381.6kg/s, device of working medium flow 154.9kg/s, Endothermic power 85.4MW, generating efficiency 17.1%.
Claims (6)
1. the solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector, it is characterised in that：Including the sun
It can heat-collection and heat-accumulation circuit, level-one Organic Rankine Cycle power generation circuit and two level Organic Rankine Cycle power generation circuit；
The solar heat-collection and heat-accumulation circuit includes solar energy heat-collection field（1）, high-temperature heat accumulation water pot（2）, low-temperature heat accumulating water pot
（3）, low-temperature heat collection water pump（12）, middle warm water pump（13）With high temperature heat exchange water pump（14）, solar energy heat-collection field（1）Outlet series connection
High-temperature heat accumulation water pot（2）, solar energy heat-collection field（1）Inlet in series low-temperature heat accumulating water pot（3）；
The level-one Organic Rankine Cycle power generation circuit includes first evaporator（4）, Intermediate Heat Exchanger（5）, first order steamer
Machine（8）, first order generator（10）It is pumped with first order organic working medium（15）, wherein first evaporator（4）, the first level steam turbine
（8）, Intermediate Heat Exchanger（5）It is pumped with first order organic working medium（15）Series connection forms first order organic working medium circuit；
The two level Organic Rankine Cycle power generation circuit includes Intermediate Heat Exchanger（5）, second level condenser（6）, the second level evaporation
Device（7）, the second level steam turbine（9）, second level generator（11）It is pumped with second level organic working medium（16）, wherein Intermediate Heat Exchanger
（5）With second level evaporator（7）Respectively with the second level steam turbine（9）, second level condenser（6）It is pumped with second level organic working medium
（16）Series connection forms second level organic working medium circuit；
The first evaporator（4）Side be device of working medium, first evaporator（4）The other side be organic working medium, water conservancy project
The first evaporator of matter side（4）It is connected on the high-temperature heat accumulation water pot in solar heat-collection and heat-accumulation circuit（2）Side, organic working medium
The first evaporator of side（4）It is connected in level-one Organic Rankine Cycle power generation circuit；
The second level evaporator（7）Side be device of working medium, second level evaporator（7）The other side be organic working medium, water conservancy project
The second level evaporator of matter side（7）It is connected on the low-temperature heat accumulating water pot in solar heat-collection and heat-accumulation circuit（3）Side, organic working medium
The second level evaporator of side（7）It is connected in two level Organic Rankine Cycle power generation circuit；
The Intermediate Heat Exchanger（5）Both sides be organic working medium, Intermediate Heat Exchanger（5）Side be connected on level-one organic Rankine
In circulating generation circuit, Intermediate Heat Exchanger（5）The other side be connected in two level Organic Rankine Cycle power generation circuit；
Daytime, solar irradiation was more than 400W/m2When, the system is carried out at the same time thermal-arrest, stores three kinds of operational modes of heat and generating power；
When night or cloudy day, the system utilizes high-temperature heat accumulation water pot（2）The heat of storage continues generating operating mode.
2. the solar energy overlapping organic Rankine cycle power generation system according to claim 1 based on gas-liquid two-phase heat collector,
It is characterized in that：The solar energy heat-collection field（1）Outlet connect high-temperature heat accumulation water pot（2）The entrance of lower part side, high temperature store
Hot-water cylinder（2）The outlet connection high temperature heat exchange water pump of lower part side（14）Entrance, high temperature exchange heat water pump（14）Outlet connection
First evaporator（4）The entrance of device of working medium side, first evaporator（4）The outlet of device of working medium side connects high-temperature heat accumulation water
Tank（2）The entrance of top side, high-temperature heat accumulation water pot（2）Warm water pump in the outlet connection of bottom（13）Entrance, middle warm water pump
（13）Outlet be separately connected medium temperature collection hot water valve（18）Entrance and medium temperature exchange heat water valve（19）Entrance, medium temperature collection hot water valve
（18）Outlet connect solar energy heat-collection field（1）Entrance, medium temperature exchange heat water valve（19）Outlet connect second level evaporator（7）
The entrance of device of working medium side, second level evaporator（7）The outlet of device of working medium side connects throttle valve（20）Entrance, throttle valve
（20）Outlet connect low-temperature heat accumulating water pot（3）The entrance on top, low-temperature heat accumulating water pot（3）The outlet of bottom connects low-temperature heat collection
Water pump（12）Entrance, low-temperature heat collection water pump（12）Outlet connect low-temperature heat collection water valve（17）Entrance, low-temperature heat collection water valve
（17）Outlet connect solar energy heat-collection field（1）Entrance；
The first evaporator（4）Organic working medium side outlet connect the first level steam turbine（8）Entrance, first order vapour
Turbine（8）Outlet connect Intermediate Heat Exchanger（5）The entrance of side, Intermediate Heat Exchanger（5）The outlet connection first order of side has
Machine working medium pump（15）Entrance, the first order organic working medium pump（15）Outlet connect first evaporator（4）Organic working medium side
Entrance；
The Intermediate Heat Exchanger（5）Outlet connection the first heat exchange outlet valve of the other side（22）Entrance, first heat exchange outlet valve
（22）Outlet connect the second level steam turbine（9）Entrance, the second level steam turbine（9）Outlet connect second level condenser（6）
Organic working medium side entrance, second level condenser（6）Organic working medium side outlet connection the second level organic working medium pump
（16）Entrance, the second level organic working medium pump（16）Outlet be separately connected the first heat exchange inlet valve（21）Entrance and second change
Hot inlet valve（23）Entrance, first heat exchange inlet valve（21）Outlet connect Intermediate Heat Exchanger（5）The entrance of the other side, second
Exchange heat inlet valve（23）Outlet connect second level evaporator（7）Organic working medium side entrance, second level evaporator（7）'s
Outlet connection the second heat exchange outlet valve of organic working medium side（24）Entrance, second heat exchange outlet valve（24）Outlet connection the
Second turbine（9）Entrance.
3. the solar energy overlapping organic Rankine cycle power generation system according to claim 1 based on gas-liquid two-phase heat collector,
It is characterized in that：The solar energy heat-collection field（1）For paraboloid trough type heat collecting field, linear Fresnel heat collecting field, tower heat collecting field
In one kind.
4. the solar energy overlapping organic Rankine cycle power generation system according to claim 1 based on gas-liquid two-phase heat collector,
It is characterized in that：Organic working medium in the level-one Organic Rankine Cycle power generation circuit is one kind in toluene and pentane；First
Grade evaporator（4）In organic working medium and Intermediate Heat Exchanger（5）The organic working medium of side generates electricity with level-one Organic Rankine Cycle
Organic working medium in circuit is identical.
5. the solar energy overlapping organic Rankine cycle power generation system according to claim 1 based on gas-liquid two-phase heat collector,
It is characterized in that：Organic working medium in the two level Organic Rankine Cycle power generation circuit is trifluorobichloroethane（R123）With five fluorine
Propane（R245fa）In one kind；Intermediate Heat Exchanger（5）The organic working medium of the other side, second level condenser（6）In organic work
Matter and second level evaporator（7）In organic working medium it is identical as the organic working medium in two level Organic Rankine Cycle power generation circuit.
6. the solar energy overlapping organic Rankine cycle power generation system according to claim 1 based on gas-liquid two-phase heat collector,
It is characterized in that：The high-temperature heat accumulation water pot（2）Operating temperature be 180~280 DEG C, low-temperature heat accumulating water pot（3）Work temperature
Degree is 30~150 DEG C.
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