CN105464914A - Direct-expansion solar thermal power generation system based on cascade Rankine cycle - Google Patents

Direct-expansion solar thermal power generation system based on cascade Rankine cycle Download PDF

Info

Publication number
CN105464914A
CN105464914A CN201510948417.5A CN201510948417A CN105464914A CN 105464914 A CN105464914 A CN 105464914A CN 201510948417 A CN201510948417 A CN 201510948417A CN 105464914 A CN105464914 A CN 105464914A
Authority
CN
China
Prior art keywords
rankine cycle
entrance
power generation
outlet
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510948417.5A
Other languages
Chinese (zh)
Inventor
季杰
李晶
李鹏程
裴刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Fivestar Solar Energy Co Ltd
Original Assignee
Guangdong Fivestar Solar Energy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Fivestar Solar Energy Co Ltd filed Critical Guangdong Fivestar Solar Energy Co Ltd
Priority to CN201510948417.5A priority Critical patent/CN105464914A/en
Publication of CN105464914A publication Critical patent/CN105464914A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • 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
    • 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

Abstract

The invention belongs to the technical field of thermal power generation and in particular relates to a direct-expansion solar thermal power generation system based on a cascade Rankine cycle. The direct-expansion solar thermal power generation system based on the cascade Rankine cycle comprises a parabolic trough collector array and the cascade Rankine cycle; the cascade Rankine cycle comprises a steam Rankine cycle located at the top and an organic Rankine cycle located at the bottom. Compared with the prior art, the direct-expansion solar thermal power generation system based on the cascade Rankine cycle has the following advantages at the same time: ability of well running at low environmental temperatures, higher power generation efficiency, suitability for small-scale distributed construction, extremely low technical requirements on heat collection and heat accumulation, and high stability and high reliability.

Description

A kind of direct expanding solar heating power generation system based on overlapping Rankine cycle
Technical field
The invention belongs to hot technical field of power generation, particularly relate to a kind of direct expanding solar heating power generation system based on overlapping Rankine cycle.
Background technique
Hot generation technology is one of important channel utilizing solar energy.According to the data at concentration solar generating market research center, global solar power generation system (SEGS) electric motor power in 2014 increases by 32%, reaches 4533MW.In the solar power system of all business, the system based on parabolic trough collector (PTC) is the most ripe and most main flow, accounts for greatly 90% of all operations and power station under development electric motor power.
Usual paraboloid trough type heat generating system (PTC-SEGS) adopts the steam Rankine cycle based on turbo-expander, it has following defect: first, there is water vapor in condensation in expansion, only has superheated vapor (being close to or higher than 673K) just can enter turbine.Because water droplet, once be formed, can clash into the blade of turbine at high speed, causes damage and reduce mechanical efficiency.Secondly, steam Rankine cycle is in order to obtain high temperature heat source, very high to the requirement of heat collection technology.In groove type heat collector, the glass to metal seal of receiver is a kind of tubular seals, and this not only needs suitable mechanical strength, tightness good under also needing vacuum state.Due to metal and the diverse feature of glass (as thermal expansion coefficient and moisture index), when running temperature from daytime be about 673K suddenly drop to be about 300K night time, receiver there will be seal failure or degradation phenomena.In solar power station in early days, this inefficacy or degeneration are difficult problems.In order to reach the high temperature of 673K, groove type heat collector focusing ratio is usually more than 60.Large focusing ratio needs high-precision tracking system, safeguards frequently, the maintenance of moving element and gear and replacing.3rd, store high-grade heat very difficult.Heat-stored device is to ensureing that the continuity of solar electrical energy generation is very important.U.S. SEGSI power station adopts mineral oil can accumulation of heat 3 hours as thermal fluid.Below 573K temperature, this technology successfully can be distributed the electric power produced, and meets without public peak load during solar irradiance.But for the more efficient thermal power station operated under higher heat-collecting temperature, mineral oil can be highly combustible, and can not use.4th, from cost consideration, thermal power station will be the bigger the better.Usually along with the increase of electric motor power, the construction cost of every kilowatt can decline.Reason is those fixed costs in extensive power station and the similar of on a small scale power station, and picture turbine, pump, efficiency is higher at high power for generator.Usual paraboloid trough type heat generating system scale is in a few to tens of megawatts, and some even reaches 100 megawatts.This needs leveling land of square meter up to a million, thus can only at desert or lonely regional Construction.
Above problem can solve by using screw expander.Screw expander is a kind of positive-displacement expansion engine, and it uses the principle of rotary displacement, avoids fluid at a high speed.Usually, it is made up of a pair of helical screw and a valve jacket.Fluid flows to other grooves of large volume from the groove of import small volume, oppositely drives twin-screw.In this process, the temperature and pressure of fluid declines, and merit is exported by transmission shaft.Compare with turbo-expander, screw expander can process gas-liquid mixture, saturated vapour and liquid.It has rapid starting/stopping, and allow thermal source pressure and volume flowrate wide fluctuations, rotating speed is low, and structure is simple, and maintenance cost is low, and assembling is easy, the features such as mobility is excellent.Screw expander just uses as far back as 20 century 70s in geothermal power generation, and present technology is quite ripe.Have much based on the steam Rankine cycle power station of screw expander in iron and steel and vapor plume waste heat, industrial radiation heat, geothermal energy utilization at present.Existing business-like 50kW-1.5MW on market, take water as the screw expander of working medium, isentropic efficiency is at 0.7-0.85.Owing to avoiding superheater, be used in solar electrical energy generation and will be had prospect very much.Solar energy heating temperature controls at below 573K, and the power station based on turbo-expander of generating efficiency and main flow is similar.
Consider cost benefit, a large defect of screw expander is low Design compression ratio.Existing Power Plant Design pressure ratio is generally at 2.5-8.This means that corresponding saturation pressure is 3.98MPa if given saturated-steam temperature is 523K(), design condensing temperature should be 0.49MPa higher than the corresponding saturation pressure of 424K().Available energy in high-temperature steam cannot by the abundant conversion of single screw expander.A solution is two or more screw machine assembled in series.But complicated design (especially the Percent of contact area in axle center) like this.The feasibility of screw expander series connection is not also proved at present.
In view of this, necessaryly provide a kind of direct expanding solar heating power generation system based on overlapping Rankine cycle, it can run at low ambient temperatures well, there is higher generating efficiency, be suitable for distributed construction on a small scale, the technical requirements of thermal-arrest and accumulation of heat is very low, and has high stability and high reliability.
Summary of the invention
The object of the invention is to: for the deficiencies in the prior art, and a kind of direct expanding solar heating power generation system based on overlapping Rankine cycle is proposed, it can run at low ambient temperatures well, there is higher generating efficiency, be suitable for distributed construction on a small scale, the technical requirements of thermal-arrest and accumulation of heat is very low, and has high stability and high reliability.
In order to achieve the above object, the present invention adopts following technological scheme:
Based on a direct expanding solar heating power generation system for overlapping Rankine cycle, comprise parabolic trough collector array and overlapping Rankine cycle, described overlapping Rankine cycle comprises the steam Rankine cycle being positioned at top and the organic Rankine bottoming cycle being positioned at bottom;
Described steam Rankine cycle comprises the heat-accumulator tank of band phase-change material, gas-liquid separator, steam screw expander and Intermediate Heat Exchanger, the outlet of described parabolic trough collector array is communicated with by the entrance of pipeline with described heat-accumulator tank, the outlet of described heat-accumulator tank is communicated with the entrance of described gas-liquid separator, the outlet of described gas-liquid separator is communicated with the entrance of described steam screw expander, the outlet of described steam screw expander is communicated with a side entrance of described Intermediate Heat Exchanger, one side outlet of described Intermediate Heat Exchanger is communicated with the entrance of described parabolic trough collector array by the first water pump,
Described organic Rankine bottoming cycle comprises described Intermediate Heat Exchanger, turbo-expander and condenser, the opposite side outlet of described Intermediate Heat Exchanger is communicated with the entrance of described turbo-expander, the outlet of described turbo-expander is communicated with a side entrance of described condenser, and a side outlet of described condenser is communicated with the opposite side entrance of described Intermediate Heat Exchanger by working medium pump.
One as the direct expanding solar heating power generation system that the present invention is based on overlapping Rankine cycle is improved, and the working medium that described steam Rankine cycle uses is water vapor.
One as the direct expanding solar heating power generation system that the present invention is based on overlapping Rankine cycle is improved, and the working medium of described organic Rankine bottoming cycle is at least one in R123 refrigeration agent, benzene and cyclohexane.
One as the direct expanding solar heating power generation system that the present invention is based on overlapping Rankine cycle is improved, the opposite side outlet of described condenser the entrance of cooling water, the opposite side entrance of described condenser is communicated with the outlet of cooling water, and the outlet of the import of cooling water and cooling water is all positioned at the same side of described condenser.
One as the direct expanding solar heating power generation system that the present invention is based on overlapping Rankine cycle is improved, and is provided with the first valve between the outlet of described gas-liquid separator and the entrance of described steam screw expander.
One as the direct expanding solar heating power generation system that the present invention is based on overlapping Rankine cycle is improved, be provided with the second valve and the 3rd valve between the entrance of described first water pump and described parabolic trough collector array, between described first water pump and the entrance of described heat-accumulator tank, be provided with described second valve and the 5th valve.
One as the direct expanding solar heating power generation system that the present invention is based on overlapping Rankine cycle is improved, and is disposed with the second water pump and the 4th valve between the bottom of described gas-liquid separator and described first water pump.
One as the direct expanding solar heating power generation system that the present invention is based on overlapping Rankine cycle is improved, and described phase-change material comprises at least one in crystalline hydrate salt, paraffin, fatty acid and high density polyethylene (HDPE).
One as the direct expanding solar heating power generation system that the present invention is based on overlapping Rankine cycle is improved, and described crystalline hydrate salt comprises at least one in six calcium chloride hydrate, disodium hydrogen phosphate dodecahydrate, sal soda and five hydrated sulfuric acid sodium.
Novelty of the present invention and Advantageous Effects are compared with prior art:
1) application for a patent for invention CN103195481B and CN102022221B proposes two-stage or multi-stage screw decompressor organic Rankine cycle power generation system, compared to single-screw expander system, the available energy of thermal source can be utilized more, and have mechanical seal high, be applicable to the features such as high pressure ratio.Compared to the system that this screw rod is connected, invention increases water vapor Rankine cycle, and itself and organic Rankine bottoming cycle are coupled.The present invention adopts autocascade cycle advantageously, and by organic Rankine bottoming cycle (ORC) as bottom cycle, the screw expander in overhead vapor circulation can be designed to less size.It is simpler that the characteristic of the low latent heat of phase change of organic working medium can make low power decompressor manufacture and design.Lower boiling organic working medium can be reacted well the change of ambient temperature and effectively can be utilized low-temperature heat source.For the steam Rankine cycle of routine; when condensing temperature is that below 306K will be difficult to realize effective expansion work of steam; because keep the degree of vacuum of below 5kpa to be that a technical barrier (refers to Fern á ndezFJ in condenser; PrietoMM, Su á rezI.Thermodynamicanalysisofhigh-temperatureregenerative organicRankinecyclesusingsiloxanesasworking uids.Energy2011; 36; 5239-5249).Power plant scale is less, and this problem is more outstanding.Saturation pressure due to organic working medium wants high a lot, and cascade system also can run at low ambient temperatures very well.Meanwhile, cascade system is higher than independent steam Rankine cycle generating efficiency (please refer to FahadA.Al-Sulaiman.Energyandsizinganalysesofparabolictro ughsolarcollectorintegratedwithsteamandbinaryvaporcycles .Energy2013; 58; 561-570).
2) application for a patent for invention US20110209474A1 proposes a kind of solar steam-organic Rankine bottoming cycle cascade system, have employed high temperature and low-temperature heat collection device and multi-fluid heat exchanger.By contrast, the present invention's steam screw expander instead of turbo-expander, and adopts the hot generation mode of direct-expansion-type, does not need intermediate heat transfer fluid.Unlike turbine, be applied in large-scale thermal power station, screw expansion function effectively carries out heat to power output within below 1MW with the rotating speed of 3600 revs/min.This makes distributed solar energy generate electricity becomes possibility.Near user's point, provide electric power and hot water that system can be made more economical.
3) application for a patent for invention US20100162700A1 proposes a kind of groove type heat collector direct expansion thermal electric generator of intermediate superheating, but multistage turbine decompressor and draw gas backheat and intermediate superheating device make system become complicated.Compared to this direct-expansion type system, the present invention's steam screw expander instead of turbo-expander.Turbo-expander is velocity profile decompressor, if produce drop in inflation process, then impeller blade can be collided and damage.Screw expander is positive-displacement expansion engine, and a distinct technical characterstic, for gas-liquid two-phase working medium can be utilized to do work, does not need superheater.Therefore, structure of the present invention is simpler and clearer, and the temperature and pressure in groove type heat collector is also much lower, and the technical requirements of thermal-arrest and accumulation of heat part also reduces greatly.
4) application for a patent for invention US20140060050A1 and US20140345276A1 proposes a kind of organic rankine cycle system based on focus solar collector, compared to the organic Rankine bottoming cycle of this high power concentrator, invention increases water vapor Rankine cycle, and instead of turbo-expander with screw expander.Long-time running of the present invention will be more stable and reliable, because most organic working medium there will be unstability, combustibility or low thermodynamic property within the scope of 473-573K, and water is the working medium of pollution-free, corrosion-free, nontoxic, non-combustible and easy acquisition.In addition, without superheater, steam Rankine cycle is by higher for the hot merit transformation efficiency than organic Rankine bottoming cycle.
Compared with prior art, the present invention can possess following advantage simultaneously: can run well at low ambient temperatures, and has higher generating efficiency, is suitable for distributed construction on a small scale, the technical requirements of thermal-arrest and accumulation of heat is very low, and has high stability and high reliability.
Stably generate electricity to ensure, the present invention combines the heat-accumulator tank of direct-expansion type technology with built-in phase-change material innovatively simultaneously.The heat-accumulator tank of built-in phase-change material can make screw expander operate in steady working condition, and the water of heat collector outlet can be cold, saturated or superheat state.As long as phase-change material is in two-phase section, in heat-accumulator tank, temperature and pressure just remains unchanged.If solar irradiance does not temporarily have or lower than design load, the water in heat collector enters into heat-accumulator tank.And then following reaction can be there is: in heat-accumulator tank, vapor pressure reduces; Part water evaporates; Fluid temperature declines, and heat passes to water from phase-change material, and fluid temperature is lower, and the heat of transmission is more; The steam produced reaches balance with the steam entering screw expander.The temperature and pressure of screw expander import reaches stable again.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein:
1-parabolic trough collector array;
2-heat-accumulator tank;
3-gas-liquid separator;
4-steam screw expander;
5-Intermediate Heat Exchanger;
6-turbo-expander;
7-condenser.
Embodiment
Below with reference to specific embodiment, the present invention and beneficial effect thereof are described in further detail, but the specific embodiment of the present invention is not limited to this.
As shown in Figure 1, a kind of direct expanding solar heating power generation system based on overlapping Rankine cycle provided by the invention, comprise parabolic trough collector array 1 and overlapping Rankine cycle, described overlapping Rankine cycle comprises the steam Rankine cycle being positioned at top and the organic Rankine bottoming cycle being positioned at bottom;
Steam Rankine cycle comprises heat-accumulator tank 2, gas-liquid separator 3, steam screw expander 4 and the Intermediate Heat Exchanger 5 of being with phase-change material, the outlet of parabolic trough collector array 1 is communicated with by the entrance of pipeline with heat-accumulator tank 2, the outlet of heat-accumulator tank 2 is communicated with the entrance of gas-liquid separator 3, the outlet of gas-liquid separator 3 is communicated with the entrance of steam screw expander 4, the outlet of steam screw expander 4 is communicated with a side entrance of Intermediate Heat Exchanger 5, and a side outlet of Intermediate Heat Exchanger 5 is communicated with the entrance of parabolic trough collector array 1 by the first water pump P 1; Water vapor passes through these parts successively, forms the steam Rankine cycle at top;
Organic Rankine bottoming cycle comprises Intermediate Heat Exchanger 5, turbo-expander 6 and condenser 7, the opposite side outlet of Intermediate Heat Exchanger 5 is communicated with the entrance of turbo-expander 6, the outlet of turbo-expander 6 is communicated with a side entrance of condenser 7, and a side outlet of condenser 7 is communicated with the opposite side entrance of Intermediate Heat Exchanger 5 by working medium pump P2.Organic working medium passes through these parts successively, forms the organic Rankine bottoming cycle of bottom.
Wherein, Intermediate Heat Exchanger 5 both as the vapour condenser of overhead vapor Rankine cycle, again as the vaporizer of bottom organic Rankine bottoming cycle.
Wherein, the working medium that steam Rankine cycle uses is water vapor, and the working medium of organic Rankine bottoming cycle is the R123 refrigeration agent (at least one in Chinese trifluorobichloroethane (2,2-dichloride-1,1,1-HFC-143a), benzene and cyclohexane.It is simpler that the characteristic of the low latent heat of phase change of organic working medium can make low power decompressor manufacture and design.Lower boiling organic working medium can be reacted well the change of ambient temperature and effectively can be utilized low-temperature heat source.
The opposite side outlet of condenser 7 entrance of cooling water, and the opposite side entrance of condenser 7 is communicated with the outlet of cooling water, and the outlet of the import of cooling water and cooling water is all positioned at the same side of condenser 7.
The first valve V1 is provided with between the outlet of gas-liquid separator 3 and the entrance of steam screw expander 4.
Be provided with the second valve V2 and the 3rd valve V3 between first water pump P 1 and the entrance of parabolic trough collector array 1, between the first water pump P 1 and the entrance of heat-accumulator tank 2, be provided with the second valve V2 and the 5th valve V5.
The second water pump P 3 and the 4th valve V4 is disposed with between the bottom of gas-liquid separator 3 and the first water pump P 1.
Phase-change material comprises at least one in crystalline hydrate salt, paraffin, fatty acid and high density polyethylene (HDPE).In many energy utilization systems, there is the incoordination between energy supply and power consumption, thus cause the irrationality of Energy harvesting and a large amount of waste.Such as, when not needing heat, but there is a large amount of heat to produce, losing as waste heat greatly so the heat of supply has, at this time just need to use phase-change material and carry out accumulation of heat.Paraffin, fatty acid and high density polyethylene (HDPE) are organic phase change material, and when it undergoes phase transition, Volume Changes is little, and Subcoold temperature is light, and corrosion-free, the thermal efficiency is high.
Crystalline hydrate salt comprises at least one in six calcium chloride hydrate, disodium hydrogen phosphate dodecahydrate, sal soda and five hydrated sulfuric acid sodium.Crystalline hydrate salt is a kind of inorganic phase-changing material, its low price, and volume thermal storage density is large, and melting heat is large, and fusing point is fixed, and thermal conductivity is larger than organic phase change material, and operating temperature span is larger, and at high temperature can carry out accumulation of heat.
In the present invention, steam is directly produced by parabolic trough collector array 1.Water vapor direct expansion in parabolic trough collector array 1, therefore avoids use boiler at power setting part, and the power consumption of collecting part recycle pump also can reduce.The temperature that water vapor remains unchanged at two-phase section and high heat transfer coefficient run very favourable to parabolic trough collector array 1.Steam direct expansion in heat absorption tube is considered to be the good method improving its competitive ability.Owing to avoiding the thermodynamic losses in oil-water/steam Intermediate Heat Exchanger, vapor (steam) temperature is higher, and then Rankine cycle efficiency is also higher, can save the levelized power cost of 26%.
The running temperature of parabolic trough collector array 1 and the much lower of the traditional direct-expansion type system based on turbo-expander of pressure ratio in system.For screw expander, the pressure of 1-3MPa and the temperature of 473-573K just enough can generate electricity.In fact, also low even than heat transferring medium in current commercialization thermal power station of this temperature and pressure.
System of the present invention has 3 kinds of operating modes:
I) system need generating and also solar irradiance very strong.In such a mode, the first valve V1, the second valve V2, the 3rd valve V3 open, and water pump P 1 operates.Overhead vapor Rankine cycle and bottom organic Rankine bottoming cycle all run.Water is by heating evaporation in parabolic trough collector array 1, and after heat-accumulator tank 2 and gas-liquid separator 3, saturated vapour enters steam screw expander 4, output work in enthalpy drop process.Outlet water vapor is condensed into saturated liquids in Intermediate Heat Exchanger 5.Be transported in parabolic trough collector array 1 through water pump P 1 pressurization.The heat of condensation release makes the organic working medium of bottom cycle evaporate.If irradiation is very strong, the 4th valve V4 can open, and the second water pump P 3 operates and in parabolic trough collector array 1, becomes superheated vapor with waterproof, and part storage of solar energy is in phase-change material.
II) system do not need generating but irradiation very strong.Second valve V2, the 3rd valve V3 and the 4th valve V4 open, and the second water pump P 3 operates.Solar energy is stored in phase-change material by water.
III) system needs generating but irradiation is very weak or do not have.First valve V1, the second valve V2, the 5th valve V5 open, and the first water pump P 1 operates.The circulation of top and bottom all runs.Heat is discharged by phase-change material and is converted into output work.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and amendment to above-mentioned mode of execution.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.

Claims (9)

1. the direct expanding solar heating power generation system based on overlapping Rankine cycle, it is characterized in that, comprise parabolic trough collector array and overlapping Rankine cycle, described overlapping Rankine cycle comprises the steam Rankine cycle being positioned at top and the organic Rankine bottoming cycle being positioned at bottom;
Described steam Rankine cycle comprises the heat-accumulator tank of band phase-change material, gas-liquid separator, steam screw expander and Intermediate Heat Exchanger, the outlet of described parabolic trough collector array is communicated with by the entrance of pipeline with described heat-accumulator tank, the outlet of described heat-accumulator tank is communicated with the entrance of described gas-liquid separator, the outlet of described gas-liquid separator is communicated with the entrance of described steam screw expander, the outlet of described steam screw expander is communicated with a side entrance of described Intermediate Heat Exchanger, one side outlet of described Intermediate Heat Exchanger is communicated with the entrance of described parabolic trough collector array by the first water pump,
Described organic Rankine bottoming cycle comprises described Intermediate Heat Exchanger, turbo-expander and condenser, the opposite side outlet of described Intermediate Heat Exchanger is communicated with the entrance of described turbo-expander, the outlet of described turbo-expander is communicated with a side entrance of described condenser, and a side outlet of described condenser is communicated with the opposite side entrance of described Intermediate Heat Exchanger by working medium pump.
2. the direct expanding solar heating power generation system based on overlapping Rankine cycle according to claim 1, is characterized in that, the working medium that described steam Rankine cycle uses is water vapor.
3. the direct expanding solar heating power generation system based on overlapping Rankine cycle according to claim 1, is characterized in that, the working medium of described organic Rankine bottoming cycle is at least one in R123 refrigeration agent, benzene and cyclohexane.
4. the direct expanding solar heating power generation system based on overlapping Rankine cycle according to claim 1, it is characterized in that, the opposite side outlet of described condenser the entrance of cooling water, the opposite side entrance of described condenser is communicated with the outlet of cooling water, and the outlet of the import of cooling water and cooling water is all positioned at the same side of described condenser.
5. the direct expanding solar heating power generation system based on overlapping Rankine cycle according to claim 1, is characterized in that, is provided with the first valve between the outlet of described gas-liquid separator and the entrance of described steam screw expander.
6. the direct expanding solar heating power generation system based on overlapping Rankine cycle according to claim 1, it is characterized in that, be provided with the second valve and the 3rd valve between the entrance of described first water pump and described parabolic trough collector array, between described first water pump and the entrance of described heat-accumulator tank, be provided with described second valve and the 5th valve.
7. the direct expanding solar heating power generation system based on overlapping Rankine cycle according to claim 1, is characterized in that, is disposed with the second water pump and the 4th valve between the bottom of described gas-liquid separator and described first water pump.
8. the direct expanding solar heating power generation system based on overlapping Rankine cycle according to claim 1, it is characterized in that, described phase-change material comprises at least one in crystalline hydrate salt, paraffin, fatty acid and high density polyethylene (HDPE).
9. the direct expanding solar heating power generation system based on overlapping Rankine cycle according to claim 8, it is characterized in that, described crystalline hydrate salt comprises at least one in six calcium chloride hydrate, disodium hydrogen phosphate dodecahydrate, sal soda and five hydrated sulfuric acid sodium.
CN201510948417.5A 2015-12-17 2015-12-17 Direct-expansion solar thermal power generation system based on cascade Rankine cycle Pending CN105464914A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510948417.5A CN105464914A (en) 2015-12-17 2015-12-17 Direct-expansion solar thermal power generation system based on cascade Rankine cycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510948417.5A CN105464914A (en) 2015-12-17 2015-12-17 Direct-expansion solar thermal power generation system based on cascade Rankine cycle

Publications (1)

Publication Number Publication Date
CN105464914A true CN105464914A (en) 2016-04-06

Family

ID=55602984

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510948417.5A Pending CN105464914A (en) 2015-12-17 2015-12-17 Direct-expansion solar thermal power generation system based on cascade Rankine cycle

Country Status (1)

Country Link
CN (1) CN105464914A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107120628A (en) * 2017-06-06 2017-09-01 上海海事大学 A kind of thermal and electric two way system and its application method based on hydrated salt chemical heat accumulation
CN112178961A (en) * 2020-09-16 2021-01-05 西安交通大学 Electricity generation, heat supply, refrigeration and water taking combined system and method based on chemical heat storage

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4760705A (en) * 1983-05-31 1988-08-02 Ormat Turbines Ltd. Rankine cycle power plant with improved organic working fluid
CN101344075A (en) * 2008-08-15 2009-01-14 天津大学 Self-overlapping type solar low temperature ranking cycle system
WO2010075598A2 (en) * 2009-01-05 2010-07-08 Pinter, Christian Method and plant for combined solar thermal electric and heat generation and refrigeration
CN201627689U (en) * 2010-01-06 2010-11-10 中国科学技术大学 Heat pipe solar organic Rankine cycle low temperature thermal power generation system
CN202012456U (en) * 2011-04-21 2011-10-19 西安华新能源工程有限公司 Solar heating low boiling point working medium screw expanding power system
CN203114542U (en) * 2013-02-07 2013-08-07 华北电力大学（保定） Organic Rankine cycle combined heat and power generation system with complementary solar energy and biomass energy
CN104632560A (en) * 2015-02-09 2015-05-20 南京瑞柯徕姆环保科技有限公司 Method and system for closing type Britten-Rankine combined cycle solar heat power generation
CN205370873U (en) * 2015-12-17 2016-07-06 广东五星太阳能股份有限公司 Formula of directly expanding solar thermal power generation system based on overlapping rankine cycle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4760705A (en) * 1983-05-31 1988-08-02 Ormat Turbines Ltd. Rankine cycle power plant with improved organic working fluid
CN101344075A (en) * 2008-08-15 2009-01-14 天津大学 Self-overlapping type solar low temperature ranking cycle system
WO2010075598A2 (en) * 2009-01-05 2010-07-08 Pinter, Christian Method and plant for combined solar thermal electric and heat generation and refrigeration
CN201627689U (en) * 2010-01-06 2010-11-10 中国科学技术大学 Heat pipe solar organic Rankine cycle low temperature thermal power generation system
CN202012456U (en) * 2011-04-21 2011-10-19 西安华新能源工程有限公司 Solar heating low boiling point working medium screw expanding power system
CN203114542U (en) * 2013-02-07 2013-08-07 华北电力大学（保定） Organic Rankine cycle combined heat and power generation system with complementary solar energy and biomass energy
CN104632560A (en) * 2015-02-09 2015-05-20 南京瑞柯徕姆环保科技有限公司 Method and system for closing type Britten-Rankine combined cycle solar heat power generation
CN205370873U (en) * 2015-12-17 2016-07-06 广东五星太阳能股份有限公司 Formula of directly expanding solar thermal power generation system based on overlapping rankine cycle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
中国太阳能学会: "《太阳能科学技术国内外水平和差距 第26集》", 31 December 2000 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107120628A (en) * 2017-06-06 2017-09-01 上海海事大学 A kind of thermal and electric two way system and its application method based on hydrated salt chemical heat accumulation
CN112178961A (en) * 2020-09-16 2021-01-05 西安交通大学 Electricity generation, heat supply, refrigeration and water taking combined system and method based on chemical heat storage
CN112178961B (en) * 2020-09-16 2021-07-06 西安交通大学 Electricity generation, heat supply, refrigeration and water taking combined system and method based on chemical heat storage

Similar Documents

Publication Publication Date Title
Li et al. Analysis of a novel solar electricity generation system using cascade Rankine cycle and steam screw expander
Li et al. A cascade organic Rankine cycle power generation system using hybrid solar energy and liquefied natural gas
US8739512B2 (en) Combined cycle power plant
CN1297744C (en) Ocean temperature difference energy and solar energy reheat circulating electric generating method
US20150167648A1 (en) Plant for energy production
CN201318255Y (en) Solar comprehensive utilizing system
CN101871440A (en) Solar energy-natural gas complementary injection type distributed combined cold heat and power supply device
Ksayer Design of an ORC system operating with solar heat and producing sanitary hot water
CN105201579A (en) Supercritical carbon dioxide power generation system based on secondary reflection condensation heat-absorption technique
CN205370873U (en) Formula of directly expanding solar thermal power generation system based on overlapping rankine cycle
CN208578679U (en) A kind of improvement Bretton solar-thermal generating system based on tower heliostat
CN203476624U (en) Low-temperature organic Rankine cycle solar heat power generation system
DeLovato et al. A review of heat recovery applications for solar and geothermal power plants
CA2736418A1 (en) A low temperature solar power system
Dabwan et al. Development and assessment of integrating parabolic trough collectors with gas turbine trigeneration system for producing electricity, chilled water, and freshwater
WO2012022273A1 (en) Solar power ammonia thermoelectric conversion system
Ghodbane et al. Performance analysis of a solar-driven ejector air conditioning system under El-Oued climatic conditions, Algeria
WO2012131860A1 (en) Device using constant volume heater
CN105065217A (en) Solar thermal power generation system and method applicable to hot and dry regions
CN103061833A (en) Solar energy and biomass energy combined heat and power cogeneration device
CN105464914A (en) Direct-expansion solar thermal power generation system based on cascade Rankine cycle
CN102536365A (en) Organic working medium thermal power generation circulating system boosted by aid of gravity
WO2016032369A1 (en) Solar power installation (variants)
CN204961183U (en) Solar thermal power generation system suitable for hot arid area
CN102865112A (en) Back thermal cycle power generation, multi-level back thermal cycle power generation and poly-generation system

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20160406

RJ01 Rejection of invention patent application after publication