CN208347995U - 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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- CN208347995U CN208347995U CN201820655200.4U CN201820655200U CN208347995U CN 208347995 U CN208347995 U CN 208347995U CN 201820655200 U CN201820655200 U CN 201820655200U CN 208347995 U CN208347995 U CN 208347995U
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- 238000010248 power generation Methods 0.000 title claims abstract description 70
- 239000007788 liquid Substances 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 161
- 238000009825 accumulation Methods 0.000 claims abstract description 62
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 8
- 230000008020 evaporation Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 5
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- MSSNHSVIGIHOJA-UHFFFAOYSA-N pentafluoropropane Chemical compound FC(F)CC(F)(F)F MSSNHSVIGIHOJA-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 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 4
- 238000005338 heat storage Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit 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
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007789 gas 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
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine 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
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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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Abstract
The utility model 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 second level Organic Rankine Cycle power generation circuit.Solar irradiation on daytime is greater than 400W/m2When, system carries out thermal-arrest simultaneously, 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.The utility model two-stage Organic Rankine Cycle all uses steam turbine, and 10MW or more scale application may be implemented in system；For steam turbine using organic working medium is done, working medium is in an overheated state in expansion process, will not generate 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 system to the quality requirements of thermal-arrest and accumulation of heat device of working medium.
Description
Technical field
The utility model belongs to solar energy thermal-power-generating technical field, and in particular to it is a kind of based on gas-liquid two-phase heat collector too
Positive energy overlapping organic Rankine cycle power generation system.
Background technique
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 for the direct generating polynomial solar energy thermal-power-generating technology of steam: firstly, 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 to control, therefore the stability of steam output is poor, and reliability is lower, so generally adopting in practical application
Saturated vapor scheme is directly generated with relatively simple.Secondly, with superheated steam circulation match heat accumulation design it 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, will cause very
Big heat transfer irreversible loss, and biggish 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 will cause 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 numerous scholars by experiment.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
Function conversion；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 running under conditions of design conditions, guarantee 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 function 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) realizes the top heat to power output of overlapping Rankine cycle.
Utility model content
In order to further increase the thermodynamic property and technical feasibility of solar energy overlapping organic Rankine cycle power generation system,
The utility model 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 second level Organic Rankine Cycle power generation circuit；
The solar heat-collection and heat-accumulation circuit include 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 and high temperature exchange heat water pump 14, and the outlet of solar energy heat-collection field 1 is connected high-temperature heat accumulation water
Tank 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 includes first evaporator 4, Intermediate Heat Exchanger 5, first order steamer
Machine 8, first order generator 10 and first order organic working medium pump 15, wherein first evaporator 4, the first level steam turbine 8, centre are changed
Hot device 5 and 15 series connection of first order organic working medium pump form first order organic working medium circuit；
The second level Organic Rankine Cycle power generation circuit includes Intermediate Heat Exchanger 5, second level condenser 6, second level evaporation
Device 7, the second level steam turbine 9, second level generator 11 and second level organic working medium pump 16, wherein Intermediate Heat Exchanger 5 and the second level
Evaporator 7 connects to form the second level and have with the second level steam turbine 9, second level condenser 6 and the second level organic working medium pump 16 respectively
Machine working medium 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, water conservancy project
The first evaporator 4 of matter side is connected on 2 side of high-temperature heat accumulation water pot in solar heat-collection and heat-accumulation circuit, organic working medium side
First evaporator 4 be 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, water conservancy project
The second level evaporator 7 of matter side is connected on 3 side of low-temperature heat accumulating water pot in solar heat-collection and heat-accumulation circuit, organic working medium side
Second level evaporator 7 be connected in second level Organic Rankine Cycle power generation circuit；
The two 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
In circulating generation circuit, the other side of Intermediate Heat Exchanger 5 is connected in second level Organic Rankine Cycle power generation circuit；
Solar irradiation on daytime is greater than 400W/m2When, the system carries out thermal-arrest simultaneously, stores three kinds of operation moulds of heat and generating power
Formula；
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 outlet connection 2 lower part side of high-temperature heat accumulation water pot of the solar energy heat-collection field 1, high-temperature heat accumulation water pot 2
The entrance of the outlet connection high temperature heat exchange water pump 14 of lower part side, the outlet of high temperature heat exchange water pump 14 connects first evaporator 4
The entrance of device of working medium side, the outlet connection 2 top side of high-temperature heat accumulation water pot of 4 device of working medium side of first evaporator enter
Mouthful, the entrance of warm water pump 13 in the outlet connection of 2 bottom of high-temperature heat accumulation water pot, the outlet of middle warm water pump 13 is separately connected medium temperature collection
The entrance of entrance and medium temperature the heat exchange water valve 19 of hot water valve 18, the outlet connection solar energy heat-collection field 1 of medium temperature collection hot water valve 18
Entrance, the entrance of the outlet connection 7 device of working medium side of second level evaporator of medium temperature heat exchange water valve 19,7 water conservancy project of second level evaporator
The entrance of the outlet connection throttle valve 20 of matter side, the entrance on outlet connection 3 top of low-temperature heat accumulating water pot of throttle valve 20, low temperature
The entrance of the outlet connection low-temperature heat collection water pump 12 of 3 bottom of accumulation of heat water pot, the outlet of low-temperature heat collection water pump 12 connects low-temperature heat collection
The entrance of water valve 17, 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 the first evaporator 4, first order vapour
The entrance of outlet connection 5 side of Intermediate Heat Exchanger of turbine 8, the outlet of 5 side of Intermediate Heat Exchanger connects first order organic working medium
The entrance of pump 15, the entrance of the outlet connection 4 organic working medium side of 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 first heat exchange outlet valve
The entrance of 22 the second level steam turbine 9 of outlet connection, organic work of the outlet connection second level condenser 6 of the second level steam turbine 9
The entrance of matter 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
The outlet of second level organic working medium pump 16 is separately connected the entrance of the first heat exchange inlet valve 21 and the entrance of the second heat exchange inlet valve 23,
The entrance of outlet connection 5 other side of Intermediate Heat Exchanger of first heat exchange inlet valve 21, the outlet connection of the second heat exchange inlet valve 23
The outlet connection second of the entrance of the organic working medium side of second level evaporator 7, the organic working medium side of second level evaporator 7 is changed
The entrance of hot outlet 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 paraboloid trough type heat collecting field, linear Fresnel heat collecting field, one in tower heat collecting field
Kind.
Organic working medium in the level-one Organic Rankine Cycle power generation circuit is one of toluene and pentane；The first order is steamed
The organic working medium of 5 side of organic working medium and Intermediate Heat Exchanger in device 4 is sent out and in level-one Organic Rankine Cycle power generation circuit
Organic working medium is identical.
Organic working medium in the second level Organic Rankine Cycle power generation circuit is trifluorobichloroethane (R123) and five fluorine third
One of alkane (R245fa)；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 second 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 utility model compared with prior art embody in the following areas:
1. the utility model uses gas-liquid two-phase heat collector, the steam that heat collecting field generates is condensed in high-temperature heat accumulation tank, is released
The heat put is for driving Organic Rankine Cycle to generate electricity.This heat collecting field direct steam generation, and the steam generated does not enter
Steam turbine or other type expanders carry out the technical solution of heat to power output, in existing solar heat power generation system there is not yet
Report.
2. the first stage that the utility model generates electricity in heat release, the heat of high temperature water pot is for driving superposition type organic Rankine
Circulating generation flows into low temperature water pot in the water of the second stage of heat release power generation, high temperature water pot, and heat is for driving bottom organic
Rankine cycle power generation.This direct-expansion-type solar heat power generation system with unique Heat release mode, only in utility model
It is had been reported that in application CN201710608229.7.The utility model and utility model CN201710608229.7 have significantly not
It is same: (at the top of 1 the utility model circulation using steam turbine rather than screw expander, heat to power output process have it is more efficient, it is defeated
The advantages that more powerful out.(for 2 steam turbines using organic working medium is done, working medium is in an overheated state in expansion process, will not generate liquid
Drop, therefore the efficiency of expanding machine is higher than wet steam turbine, and mechanical failure will not occur.Organic working medium and water are in hot physical property
There are essential distinctions.By taking the organic working medium R123 in second level Organic Rankine Cycle power generation circuit as an example, in contrast to the saturation of water
Temperature-entropy (T-s) curve is as shown in Figure 5: when since R123 expand being saturated gaseous state, hot gas was constantly in during acting
State (shown in black vertical line), and saturated vapor is constantly in gas-liquid two-phase state in expansion process (shown in black vertical line).
Even if therefore the temperature of high temperature water pot fluctuates, then can also be to avoid in expansion process using the steam turbine of dry organic working medium
Generate drop.
3. the utility model first order and second level Organic Rankine Cycle all use steam turbine, 10MW is may be implemented in system
The above scale application.For the 10 MW systems using wet steam turbine, 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
When top thermal circulation uses the Organic Rankine Cycle based on dry working medium, steam turbine isentropic efficiency can maintain 85% or so, be
Generating efficiency of uniting 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 system to the quality of 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.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model.
Fig. 2 is that thermal-arrest, accumulation of heat and power generation mode carry out schematic diagram simultaneously.
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 (T-s curve graph) of R123 and water.
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
Mouth valve 21, first heat exchange outlet valve 22, second heat exchange inlet valve 23, second heat exchange outlet valve 24, throttle valve 20.
Specific embodiment
With reference to the accompanying drawing, the utility model 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 second 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
Collecting heat-exchanger pump 12, middle warm water pump 13 and high temperature heat exchange water pump 14, solar energy heat-collection field 1 is paraboloid trough type heat collecting field.
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
2 side of high-temperature heat accumulation water pot in circuit, the first evaporator 4 of organic working medium side are 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.
Second 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 two 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 second 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
In 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 is connected on second level
In Organic Rankine Cycle power generation circuit；Organic working medium in second 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 second level
Organic working medium in Organic Rankine Cycle power generation circuit is identical.
The specific connection relationship of each component of solar energy overlapping organic Rankine cycle power generation system is as follows:
The entrance of the outlet connection 2 lower part side of high-temperature heat accumulation water pot of 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 outlet connection 2 top side of 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 connection 7 device of working medium side of 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, throttle valve 20 outlet connection 3 top of low-temperature heat accumulating water pot entrance, 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 of low-temperature heat collection water pump 12 connects low-temperature heat collection water valve 17
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 first evaporator 4, the first level steam turbine
The entrance of 8 outlet connection 5 side of Intermediate Heat Exchanger, the outlet connection first order organic working medium pump 15 of 5 side of Intermediate Heat Exchanger
Entrance, the first order organic working medium pump 15 outlet connection 4 organic working medium side of first evaporator entrance；
The entrance of outlet connection the first heat exchange outlet valve 22 of 5 other side of 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 connection 5 other side of 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 working principle of the utility model is described as follows:
(1) the such as larger than 400W/m when daytime, solar irradiation was more sufficient2, system carry out simultaneously thermal-arrest, store heat and generating power three
Kind operational mode 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 the second level organic working medium pump 16 operation, low-temperature heat collection water valve 17, medium temperature collection hot water valve 18, the first stage exchange heat inlet valve 21
It is opened with first stage heat exchange outlet valve 22.Water at low temperature in low-temperature heat accumulating water pot 3 is via low-temperature heat collection water pump 12 and low temperature collection
Hot-water valve 17 enters high-temperature heat accumulation water pot 2, a portion high-temperature water after being heated to set temperature into solar energy heat-collection field 1
High-temperature heat accumulation water pot 2 and remaining high-temperature water are returned to after entering the cooling heat release of first evaporator 4 via high temperature heat exchange water pump 14
Mixing, the high-temperature water to cool down after mixing enter solar energy heat-collection field 1 via middle warm water pump 13 and medium temperature collection hot-water valve 18 and heat
Again high-temperature heat accumulation water pot 2 is stored in after to set temperature, by the coordinated operation of low-temperature heat collection water pump 12 and middle warm water pump 13,
It can remain that the high-temperature water in high-temperature heat accumulation water pot 2 maintains set temperature.Dry in first order Organic Rankine Cycle has
Machine working medium is absorbed heat evaporation in first evaporator 4, and high temperature does organic working medium steam and enters 8 expansion work of the first level steam turbine simultaneously
Electric energy is exported via first order generator 10, the first level steam turbine 8 after expansion cooling goes out in the entrance of dry organic working medium steam
Between heat exchanger 5 condense heat release into liquid, it is complete that middle geothermal liquid via first order organic working medium pump 15 is again introduced into first evaporator 4
At first order 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,
Medium temperature does organic working medium steam and enters 9 expansion work of the second level steam turbine and by the second level through first stage heat exchange outlet valve 22
Generator 11 exports electric energy, and the second level steam turbine 9 after expansion cooling goes out dry organic working medium steam and enters second level condenser 6
Heat release is condensed into liquid, cryogenic liquid enters intermediate via second level organic working medium pump 16 and first stage heat exchange imported valve 21
Heat exchanger 5 completes 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 by adjusting the high temperature heat exchange control of water pump 14 to maintain to change
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 is via second level organic working medium pump 16 and second
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
50 DEG C DEG C are gradually down to, the evaporating temperature of first order Organic Rankine Cycle is the evaporation temperature of 240 DEG C, 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 for selecting current solar energy thermo-power station to generally use
Thermal-collecting tube forms solar energy heat-collection field, and calculated result shows: the net power output of first order Organic Rankine Cycle is 9.6MW, hair
Electrical efficiency is 10.1%；The net power output of second level Organic Rankine Cycle is 14.6MW, generating efficiency 17.1%；Overlapping is organic
The gross output of Rankine cycle system is 24.2MW, and total generating efficiency is 25.5%；System nominal needs solar energy collection when running
Thermal field 1 collects heat and water temperature is heated to 250 DEG C by 180 DEG C, collecting efficiency 75.7%, collector power 95.0MW, required
Heat collecting field area is 156856m2.In addition, if first stage heat release power generation mode continuous service four hours, high-temperature heat accumulation water pot 2
Need to 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 be driven
Dynamic second level Organic Rankine Cycle is run 7.6 hours；When heat needed for collecting accumulation of heat in four hours, additional solar energy collection 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 thermal field 1, collecting efficiency 76.1%, required heat collecting field area
For 281577m2。
Detailed calculated result is as follows:
First order Organic Rankine Cycle: rated generation power 10.0MW, first order organic working medium pump wasted work 414.4kW, first
Benzene working medium flow 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, the second level organic working medium pump wasted work 653.5KW,
R123 working medium flow 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 second 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) and high temperature heat exchange water pump (14), the outlet series connection of solar energy heat-collection field (1)
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 includes first evaporator (4), Intermediate Heat Exchanger (5), first order steamer
Machine (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 first order organic working medium pump (15) series connection form first order organic working medium circuit；
The second level Organic Rankine Cycle power generation circuit includes Intermediate Heat Exchanger (5), second level condenser (6), second level evaporation
Device (7), the second level steam turbine (9), second level generator (11) and second level organic working medium pump (16), wherein Intermediate Heat Exchanger
(5) it is pumped respectively with the second level steam turbine (9), second level condenser (6) and second level organic working medium with second level evaporator (7)
(16) series connection forms second level organic working medium 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, water conservancy project
The first evaporator (4) of matter side is connected on high-temperature heat accumulation water pot (2) side in solar heat-collection and heat-accumulation circuit, organic working medium
The first evaporator (4) of side 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, water conservancy project
The second level evaporator (7) of matter side is connected on low-temperature heat accumulating water pot (3) side in solar heat-collection and heat-accumulation circuit, organic working medium
The second level evaporator (7) of side is connected in second level Organic Rankine Cycle power generation circuit；
The two 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
In circulating generation circuit, the other side of Intermediate Heat Exchanger (5) is connected in second level Organic Rankine Cycle power generation circuit；
Solar irradiation on daytime is greater than 400W/m2When, the system carries out thermal-arrest simultaneously, 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 of high-temperature heat accumulation water pot (2) storage.
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 by: the entrance of outlet connection high-temperature heat accumulation water pot (2) lower part side of the solar energy heat-collection field (1), high temperature store
The entrance of outlet connection high temperature heat exchange water pump (14) of hot-water cylinder (2) lower part side, the outlet connection of high temperature heat exchange water pump (14)
The outlet of the entrance of first evaporator (4) device of working medium side, first evaporator (4) device of working medium side connects high-temperature heat accumulation water
The entrance of tank (2) top side, high-temperature heat accumulation water pot (2) bottom outlet connection in warm water pump (13) entrance, middle warm water pump
(13) outlet is separately connected the entrance of medium temperature collection hot water valve (18) and the entrance of medium temperature heat exchange water valve (19), medium temperature collection hot water valve
(18) outlet of the entrance of outlet connection solar energy heat-collection field (1), medium temperature heat exchange water valve (19) connects second level evaporator (7)
The entrance of device of working medium side, the entrance of outlet connection throttle valve (20) of second level evaporator (7) device of working medium side, throttle valve
(20) entrance on outlet connection low-temperature heat accumulating water pot (3) top, the outlet of low-temperature heat accumulating water pot (3) bottom connects low-temperature heat collection
The entrance of water pump (12), the entrance of outlet connection low-temperature heat collection water valve (17) of low-temperature heat collection water pump (12), low-temperature heat collection water valve
(17) entrance of outlet connection solar energy heat-collection field (1)；
The entrance of the outlet connection the first level steam turbine (8) of the organic working medium side of the first evaporator (4), first order vapour
The outlet connection first order of the entrance of outlet connection Intermediate Heat Exchanger (5) side of turbine (8), Intermediate Heat Exchanger (5) side has
The entrance of machine working medium pump (15), the outlet that first order organic working medium pumps (15) connect first evaporator (4) organic working medium side
Entrance；
The entrance of the first heat exchange outlet valve (22) of outlet connection of Intermediate Heat Exchanger (5) other side, the first heat exchange outlet valve
(22) outlet of the entrance of outlet connection the second level steam turbine (9), the second level steam turbine (9) connects second level condenser (6)
Organic working medium side entrance, the organic working medium side of second level condenser (6) outlet connection the second level organic working medium pump
(16) entrance, the entrance and second that the outlet of second level organic working medium pump (16) is separately connected the first heat exchange inlet valve (21) change
The entrance of hot inlet valve (23), the entrance of outlet connection Intermediate Heat Exchanger (5) other side of the first heat exchange inlet valve (21), second
The entrance of the organic working medium side of outlet connection second level evaporator (7) of heat exchange inlet valve (23), second level evaporator (7)
The entrance of the second heat exchange outlet valve (24) of outlet connection of organic working medium side, the outlet connection the of the second heat exchange outlet valve (24)
The entrance of second turbine (9).
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 by: the solar energy heat-collection field (1) is paraboloid trough type heat collecting field, linear Fresnel heat collecting field, tower heat collecting field
One of.
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 by: the organic working medium in the level-one Organic Rankine Cycle power generation circuit is one of toluene and pentane；First
The organic working medium of organic working medium and Intermediate Heat Exchanger (5) side in grade evaporator (4) 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 by: the organic working medium in the second level Organic Rankine Cycle power generation circuit is in trifluorobichloroethane and pentafluoropropane
One kind；The organic working medium, the organic working medium in second level condenser (6) and second level evaporation of Intermediate Heat Exchanger (5) other side
Organic working medium in device (7) is identical as the organic working medium in second 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 by: the operating temperature of the high-temperature heat accumulation water pot (2) is 180~280 DEG C, the work temperature of low-temperature heat accumulating water pot (3)
Degree is 30~150 DEG C.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506177A (en) * | 2018-05-04 | 2018-09-07 | 中国科学技术大学 | Solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector |
| CN111287813A (en) * | 2020-02-26 | 2020-06-16 | 中国华能集团清洁能源技术研究院有限公司 | Solar supercritical carbon dioxide triple-cycle power generation system and method |
-
2018
- 2018-05-04 CN CN201820655200.4U patent/CN208347995U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506177A (en) * | 2018-05-04 | 2018-09-07 | 中国科学技术大学 | Solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector |
| CN108506177B (en) * | 2018-05-04 | 2024-01-05 | 中国科学技术大学 | Solar cascade organic Rankine cycle power generation system based on gas-liquid two-phase heat collector |
| CN111287813A (en) * | 2020-02-26 | 2020-06-16 | 中国华能集团清洁能源技术研究院有限公司 | Solar supercritical carbon dioxide triple-cycle power generation system and method |
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