CN102678489A - Parabolic trough type solar thermal power generation system - Google Patents

Parabolic trough type solar thermal power generation system Download PDF

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Publication number
CN102678489A
CN102678489A CN2011100605392A CN201110060539A CN102678489A CN 102678489 A CN102678489 A CN 102678489A CN 2011100605392 A CN2011100605392 A CN 2011100605392A CN 201110060539 A CN201110060539 A CN 201110060539A CN 102678489 A CN102678489 A CN 102678489A
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China
Prior art keywords
type solar
heat
slot type
loop
working medium
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Pending
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CN2011100605392A
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Chinese (zh)
Inventor
金红光
刘启斌
高志超
韩巍
张传强
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Institute of Engineering Thermophysics of CAS
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Institute of Engineering Thermophysics of CAS
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Priority to CN2011100605392A priority Critical patent/CN102678489A/en
Publication of CN102678489A publication Critical patent/CN102678489A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/44Heat exchange systems
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

Abstract

The invention discloses a parabolic trough type solar thermal power generation system, comprising a single-loop parabolic trough type solar energy heat collection unit, a double-loop parabolic trough type solar energy heat collection unit, a heat exchanging unit and a power generation unit, wherein the solar radiation energy is gathered and collected by the single-loop parabolic trough type solar energy heat collection unit and the double-loop parabolic trough type solar energy heat collection unit; the energy of the double-loop parabolic trough type solar energy heat collection unit is transmitted to saturated steam from the single-loop parabolic trough type solar energy heat collection unit by the heat exchanging unit, so that the saturated steam is converted into superheated steam; and the superheated steam is converted into electric energy by the power generation unit through a power device. The problems of large temperature difference between a heat transfer working medium and water heating, high irreversible loss and low power generation efficiency at mid-low-temperature caused by that the working mediums in double loops run through in one time are solved in the prior art, the flexibility of the system is enhanced; the steam parameter is enhanced by using the high-temperature heat transfer medium, so that the solar thermal power generation efficiency is improved.

Description

A kind of parabolic slot type solar heat power generation system
Technical field
The present invention relates to the solar energy thermal-power-generating technical field, especially a kind of parabolic slot type solar heat power generation system.
Background technique
There is not problems such as consuming a large amount of fossil energies and befouling environment in the solar energy thermal-power-generating technology, is a kind of cleaning and continuable generation technology.It is main that the solar energy thermal-power-generating technology provides energy with light collecting heat collector, mainly is divided into three types of parabolic slot type, tower and dish formulas.Comparatively speaking, parabolic trough type solar power generation technology is comparatively ripe, the operation of existing commercialization power station.
The main bottleneck of development parabolic trough type solar power generation technology is that cost of investment is high, system effectiveness is lower.Therefore improve the system core technical merit and seek high efficiency system integration method and become the main path that solves the technical development of restriction parabolic trough type solar power generation.Yet present research concentrates on the performance that improves the system core unit mostly, as improves heat collecting pipe selective coating, raising condenser mirror reflectivity etc.
At present, be that the live steam generation parabolic slot type solar power plant system of working medium is in the pilot scale stage with water.Advantages such as this system has thermal efficiency high, and middle heat exchange link is few.But there is system's control difficulty, problems such as superheated vapor heat exchange weak effect.Especially in the steam superheating section, the steam of excess pressure, temperature has brought huge challenge to the structure and the performance of heat absorption tube.
At present, be the double loop parabolic slot type solar power plant system of working medium with the conduction oil, adopt the conduction oil One-through design usually.The shortcoming of this system design mode is that the average operating temperature of whole groove type solar heat collecting field is higher, and thermal efficiency is lower, and the use amount of conduction oil is very big, and system's investment is big.
The present invention from system flow and integration mode, has proposed the parabolic slot type solar energy heat-collection field that single loop combines with the double loop on existing business-like parabolic slot type solar electrical energy generation electric power station system basis.Compare with the groove type solar heat collecting field of traditional single type, changed the heat exchange form of steam in heat absorption tube, improved the thermal efficiency of solar energy heating unit; Reduce the solar energy heating cellar area simultaneously, reduced the solar energy heat-collection field investment; And reduced the use amount of middle heat-transfer working medium, reduced the heat-exchange system investment.The present invention can significantly improve steam parameter because of the flexibility of its system, improves the thermal efficiency of power cycle, and then improves whole system efficient, has good Commercial Prospect.
Summary of the invention
The technical problem that (one) will solve
In view of this; Main purpose of the present invention is to provide a kind of parabolic slot type solar heat power generation system; To overcome with water is the bottleneck problem that working medium superheat section heat exchange efficiency is low, steam parameter is low in the parabolic slot type solar heat power generation system of working medium; Improve steam quality, improve system's generating efficiency.
(2) technological scheme
For achieving the above object; The invention provides a kind of parabolic slot type solar heat power generation system; This system comprises with water being the single loop formula parabolic slot type solar energy heating unit of working medium, is formula parabolic slot type solar energy heating unit, double loop, heat exchange unit and the dynamic power unit of working medium with conduction oil or fused salt; Wherein: be the single loop formula parabolic slot type solar energy heating unit of working medium with water and be the formula parabolic slot type solar energy heating unit, double loop of working medium, be used for receiving and assemble solar radiation energy with conduction oil or fused salt; Heat exchange unit is used for giving the saturated vapour from single loop formula parabolic slot type solar energy heating unit with the energy transfer of formula parabolic slot type solar energy heating unit, double loop, makes this saturated vapour change superheated vapor into; Generator unit is used for will crossing this hot steam through power plant and is converted into electric energy.
In the such scheme, said single loop formula parabolic slot type solar energy heating unit is heat absorption working medium with water, with the solar radiant energy heated feed water, makes it be converted into saturated vapour.
In the such scheme, formula parabolic slot type solar energy heating unit, said double loop is a working medium with middle heat-transfer working medium, with solar radiant energy in order to heat-transfer working medium in the middle of heating.
In the such scheme; Said single loop formula parabolic slot type solar energy heating unit and formula parabolic slot type solar energy heating unit, double loop are the different heat transfer working medium of directly understanding coalescence reception solar radiant energy, the groove type solar thermal-arrest unit of different operating temperature range; The direct heated feed water in single loop formula parabolic slot type solar energy heating unit wherein; Radiation loss is few; Thermal efficiency is high, and formula parabolic slot type solar energy heating unit, double loop can improve thermal-arrest unit sender property outlet parameter by middle heat-transfer working medium.
In the such scheme, said single loop thermal-arrest unit is working medium with water, and the solar radiant energy of reception is directly passed to water conservancy project matter through solar thermal collector, and water after the preheating evaporation, changes the saturated vapour under the certain pressure in heat collector.
In the such scheme, thermal-arrest unit, said double loop is a working medium with fused salt or conduction oil, the heat of heat-transfer working medium in the middle of solar radiant energy is changed into.
In the such scheme, said heat exchange unit is efficient forced heat exchanging equipment, and the energy transfer that this centre heat-transfer working medium is entrained is given from the saturated vapour in the single loop thermal-arrest unit, makes this saturated vapour change superheated vapor into, and then improves steam parameter.
In the such scheme, the power plant that said generator unit adopts are steam turbine generating device or screw rod machine electricity generating device.
(3) beneficial effect
Can find out that from technique scheme the present invention has following beneficial effect:
1, this parabolic slot type solar heat power generation system provided by the invention has adopted compound thermal-arrest Jing Chang, i.e. two kinds of different groove type solar heat collecting field of single loop and double loop.It has improved the matching state of heat-collecting temperature in the parabolic slot type solar energy heat-collection field, improves thermal efficiency, reduces the solar energy heat-collection field area, reduces the cost of investment of solar energy heat-collection field.
2, this parabolic slot type solar heat power generation system provided by the invention, the preheating evaporation process that the single loop solar energy heat-collection field is applied to feed water does not have middle heat-transfer working medium, has reduced the heat exchange number of times, improves energy utilization efficiency, has reduced the heat-exchange system investment.Water is in the preheating evaporation process of solar thermal collector, and water and absorption wall have improved the heat exchange effect in the heat collecting pipe in the face of the stream surface coefficient of heat transfer is big, have reduced radiation loss, have improved the thermal efficiency of solar energy heat-collection field, reduce required heat-collecting area.
3, this parabolic slot type solar heat power generation system provided by the invention, the superheating process that the double loop solar energy heat-collection field is applied to feed water.Because the coefficient of heat transfer of middle heat-transfer working medium in the heat collecting pipe pipe is higher than the coefficient of heat transfer of steam in heat collecting pipe, therefore improved the flowing heat transfer effect in the pipe.In addition, be in the system of middle heat-transfer working medium with the fused salt, can improve the outlet temperature of solar energy heat-collection field inner fluid, and then improve steam parameter, improve system thermal efficiency.
4, this parabolic slot type solar heat power generation system provided by the invention carries out energy transfer from the heat-transfer working medium of double loop solar energy heat-collection field at heat exchange unit and saturated vapour from the single loop solar energy heat-collection field.Heat exchange unit can adopt high-efficiency heat exchanger equipment.Compare steam and in solar heat absorber, be heated, its heat exchange effect increases substantially.
5, this parabolic slot type solar heat power generation system provided by the invention; Reduced the use amount of middle heat-transfer working medium; Reduced the capacity of heat exchange unit, reduced usage quantity simultaneously, reduced the investment of system such as auxiliary devices such as central fluid expansion drum, pumps.
6, this parabolic slot type solar heat power generation system provided by the invention, wherein single loop solar energy heat-collection field and double loop solar energy heat-collection field are separate organically combines again, has very strong flexibility.The single loop solar energy heat-collection field can produce more saturated vapour, is used for consuming such as the needs such as startup of steam turbine the position of steam, improves the average annual performance of system.
Description of drawings
Fig. 1 is the structural representation of parabolic slot type solar heat power generation system provided by the invention;
Fig. 2 is the parabolic slot type solar heat power generation system structural representation according to the embodiment of the invention.
Embodiment
For making the object of the invention, technological scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to further explain of the present invention.
Fig. 1 is the structural representation of a kind of parabolic slot type solar heat power generation system of the present invention's proposition; This system comprises single loop formula parabolic slot type solar energy heating unit and formula parabolic slot type solar energy heating unit, double loop, heat exchange unit and generator unit at least; Wherein, single loop formula parabolic slot type solar energy heating unit and formula parabolic slot type solar energy heating unit, double loop are the different heat transfer working medium of directly understanding coalescence reception solar radiant energy, the groove type solar thermal-arrest unit of different operating temperature range.Single loop formula parabolic slot type solar energy heating unit is heat absorption working medium with water; With the solar radiant energy heated feed water; Make it be converted into saturated vapour; Formula parabolic slot type solar energy heating unit, double loop is a working medium with middle heat-transfer working medium, like conduction oil or fused salt, with solar radiant energy in order to heat-transfer working medium in the middle of heating; Heat exchange unit is that the energy transfer that middle heat-transfer working medium working medium is entrained is given from the saturated vapour in the single loop, makes it change superheated vapor into; Generator unit is through power plant, like steam turbine, generator etc., superheated vapor is converted into electric energy.
Single loop formula parabolic slot type solar energy heating unit and formula parabolic slot type solar energy heating unit, double loop are the different heat transfer working medium of directly understanding coalescence reception solar radiant energy, the groove type solar thermal-arrest unit of different operating temperature range.The direct heated feed water in single loop formula parabolic slot type solar energy heating unit, radiation loss is less, and thermal efficiency is higher; Formula parabolic slot type solar energy heating unit, double loop can improve thermal-arrest unit sender property outlet parameter by middle heat-transfer working medium.
Single loop formula parabolic slot type solar energy heating unit is working medium with water; The solar radiant energy that parabolic slot type solar energy heating unit receives is directly passed to working medium-water through solar thermal collector; Water after the preheating evaporation, changes the saturated vapour under the certain pressure in heat collector.
Formula parabolic slot type solar energy heating unit, double loop is a working medium with heat-transfer working medium in the middle of fused salt or the heat conduction wet goods, solar radiant energy is changed into the heat of conduction oil or fused salt working medium.
Heat exchange unit is efficient forced heat exchanging equipment, and the energy transfer that this centre heat-transfer working medium is entrained is given from the saturated vapour in the single loop thermal-arrest unit, makes this saturated vapour change superheated vapor into, and then improves steam parameter;
Generator unit will be converted into electric energy from the heat energy of the superheated vapor of heat exchange unit.Generator unit can be steam turbine generating device or screw rod machine electricity generating device.
In the such scheme, described middle heat-transfer working medium can be high temperature resistant working medium such as conduction oil or fused salt.
Refer again to Fig. 1, parabolic slot type solar heat power generation system provided by the invention comprises single loop solar energy heat-collection field 1, double loop solar energy heat-collection field 2, heat exchange unit 3, reaches generator unit 4.
Wherein, Single loop solar energy heat-collection field 1, double loop solar energy heat-collection field 2 are used to assemble solar radiant energy; Single loop solar energy heat-collection field 1 changes into the heat of feedwater with solar radiant energy, the heat of heat-transfer working medium in the middle of double loop solar energy heat-collection field 2 changes into solar radiant energy; In the heat exchange subtense angle, receive heat from the saturated vapour of single loop solar energy heat-collection field from heat-transfer working medium in the middle of the high temperature of double loop solar energy heat-collection field, make it become superheated vapor; At last, superheated vapor entering power generation sub-system is generated electricity.The water of condensation of power generation sub-system gets into the single loop solar energy heat-collection field once more through pump b and accomplishes the preheating evaporation process, gets into the heat exchange subtense angle then and realizes steam superheating, gets into power generation sub-system at last and generates electricity, and so realizes reciprocation cycle.
With reference to Fig. 2, Fig. 2 is the parabolic slot type solar heat power generation system structural representation according to the embodiment of the invention.Each parts reaches and is labeled as accordingly among Fig. 2: 1-single loop solar energy heat-collection field; 2-double loop solar energy heat-collection field; 3-steam buffer tank; The 4-superheater; The 5-reheater; The 6-high-pressure cylinder; The 7-low pressure (LP) cylinder; The 8-condenser; The 9--condensate pump; 10-low-pressure heater group; The 11-oxygen-eliminating device; 12-high-pressure heater group.
In Fig. 2, single loop solar energy heat-collection field 1 changes into the heat of feedwater with solar radiant energy, makes its preheating evaporation; Get into steam buffer tank 3, double loop solar energy heat-collection field 2 is assembled the middle heat-transfer working medium of solar radiation energy heating, behind superheater 4; Saturated vapour from single loop solar energy heat-collection field 1 receives the heat from heat-transfer working medium in the middle of the high temperature of double loop solar energy heat-collection field 2; Make it become superheated vapor, get into steam turbine afterwards, steam turbine is made up of high-pressure cylinder 6 and low pressure (LP) cylinder 7; Adopt the single reheat mode; Superheated vapor expands acting after reheated steam superheater 5 back entering low pressure (LP) cylinders 7 continue the acting of expanding by high-pressure cylinder 6, and exhaust steam gets into condenser 8 condensations, and water of condensation is accomplished power cycle through condensate pump 9 and low-pressure heater group 10, oxygen-eliminating device 11 and high-pressure heater group 12.
The present invention also analyzes the above embodiments and traditional single pass double loop conduction oil solar heat power generation system respectively, and the major parameter among the embodiment is as shown in table 1, and its thermal performance is as shown in table 2.Compare with traditional conduction oil groove type solar power station, under identical power output condition, the design point efficient among the embodiment has improved 1.4 percentage points; Heat-collecting area saving rate relatively is 1.61%, and the solar energy heat-collection field area reduces, and can effectively reduce the investment and the maintenance cost of heat collecting field; And then the specific investment of reduction system; In addition, the Power island main steam is brought up to 530 ℃, has promoted power cycle efficient.Based on above analysis, can find out the superiority that proposes flow process among the present invention.
The logistics sequence number Temperature (℃) Pressure (bar) The logistics sequence number Temperature (℃) Pressure (bar)
S1 235 101 S5 530 100
S2 311 100 S6 530 17
S3 340 8.5 S7 42 0.08
S4 560 8 S8 42 0.08
Table 1
Table 2
Above-described specific embodiment; The object of the invention, technological scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (8)

1. parabolic slot type solar heat power generation system; It is characterized in that; This system comprises with water being the single loop formula parabolic slot type solar energy heating unit of working medium, be formula parabolic slot type solar energy heating unit, double loop, heat exchange unit and the dynamic power unit of working medium with conduction oil or fused salt, wherein:
Be the single loop formula parabolic slot type solar energy heating unit of working medium with water and be the formula parabolic slot type solar energy heating unit, double loop of working medium, be used for receiving and assemble solar radiation energy with conduction oil or fused salt;
Heat exchange unit is used for giving the saturated vapour from single loop formula parabolic slot type solar energy heating unit with the energy transfer of formula parabolic slot type solar energy heating unit, double loop, makes this saturated vapour change superheated vapor into;
Generator unit is used for will crossing this hot steam through power plant and is converted into electric energy.
2. parabolic slot type solar heat power generation system according to claim 1 is characterized in that, said single loop formula parabolic slot type solar energy heating unit is heat absorption working medium with water, with the solar radiant energy heated feed water, makes it be converted into saturated vapour.
3. parabolic slot type solar heat power generation system according to claim 1 is characterized in that, formula parabolic slot type solar energy heating unit, said double loop is a working medium with middle heat-transfer working medium, with solar radiant energy in order to heat-transfer working medium in the middle of heating.
4. parabolic slot type solar heat power generation system according to claim 1; It is characterized in that; Said single loop formula parabolic slot type solar energy heating unit and formula parabolic slot type solar energy heating unit, double loop are the different heat transfer working medium of directly understanding coalescence reception solar radiant energy, the groove type solar thermal-arrest unit of different operating temperature range; The direct heated feed water in single loop formula parabolic slot type solar energy heating unit wherein, radiation loss is few, and thermal efficiency is high; Formula parabolic slot type solar energy heating unit, double loop can improve thermal-arrest unit steam (vapor) outlet parameter by middle heat-transfer working medium.
5. parabolic slot type solar heat power generation system according to claim 1; It is characterized in that; Said single loop thermal-arrest unit is working medium with water; The solar radiant energy that receives is directly passed to water conservancy project matter through solar thermal collector, and water after the preheating evaporation, changes the saturated vapour under the certain pressure in heat collector.
6. parabolic slot type solar heat power generation system according to claim 1 is characterized in that, thermal-arrest unit, said double loop is a working medium with fused salt or conduction oil, the heat of heat-transfer working medium in the middle of solar radiant energy is changed into.
7. parabolic slot type solar heat power generation system according to claim 1; It is characterized in that; Said heat exchange unit is efficient forced heat exchanging equipment; The energy transfer that this centre heat-transfer working medium is entrained is given from the saturated vapour in the single loop thermal-arrest unit, makes this saturated vapour change superheated vapor into, and then improves steam parameter.
8. parabolic slot type solar heat power generation system according to claim 1 is characterized in that, the power plant that said generator unit adopts are steam turbine generating device or screw rod machine electricity generating device.
CN2011100605392A 2011-03-14 2011-03-14 Parabolic trough type solar thermal power generation system Pending CN102678489A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105275758A (en) * 2014-07-02 2016-01-27 中广核太阳能开发有限公司 Integrated solar thermal power plant and solar thermal power generation method
CN105299922A (en) * 2015-11-17 2016-02-03 绍兴文理学院 Slot type solar drug manufacturing heat energy system
CN111174448A (en) * 2020-01-02 2020-05-19 中国科学院工程热物理研究所 Solar energy and waste heat integrated complementary power generation system

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CN101825072A (en) * 2010-04-16 2010-09-08 华中科技大学 Trough-dish combined solar thermal power generation system with fixed focus
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JPS60122865A (en) * 1983-12-07 1985-07-01 Hitachi Ltd Solar heat electric power generation apparatus
DE4126036A1 (en) * 1991-08-06 1993-02-11 Siemens Ag Gas and steam turbine plant with solar heated system generator - with generator connected to heat exchanger in h.p. steam line from waste heat steam generator
US6141949A (en) * 1996-12-12 2000-11-07 Deutsches Zentrum Fuer Luft- Und Raumfahrt E.V. Process and apparatus using solar energy in a gas and steam power station
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105275758A (en) * 2014-07-02 2016-01-27 中广核太阳能开发有限公司 Integrated solar thermal power plant and solar thermal power generation method
CN105299922A (en) * 2015-11-17 2016-02-03 绍兴文理学院 Slot type solar drug manufacturing heat energy system
CN111174448A (en) * 2020-01-02 2020-05-19 中国科学院工程热物理研究所 Solar energy and waste heat integrated complementary power generation system

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