CN215333266U - Point-line focusing combined solar thermal power generation system - Google Patents

Point-line focusing combined solar thermal power generation system Download PDF

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Publication number
CN215333266U
CN215333266U CN202121812414.6U CN202121812414U CN215333266U CN 215333266 U CN215333266 U CN 215333266U CN 202121812414 U CN202121812414 U CN 202121812414U CN 215333266 U CN215333266 U CN 215333266U
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focusing
point
steam
outlet
low
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许世森
郑建涛
徐越
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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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
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Abstract

The utility model discloses a point-line focusing combined solar thermal power generation system, wherein a low-temperature heat collection section replaces a preheater by utilizing the characteristics of low temperature and high mirror field efficiency of line focusing, and a high-temperature section adopts the characteristics of high point focusing temperature and high thermoelectric efficiency, so that the height of a point focusing heat absorber is reduced, and the mirror field efficiency is improved. The utility model has high integration efficiency, low loss and low cost.

Description

Point-line focusing combined solar thermal power generation system
Technical Field
The utility model belongs to the field of new energy power generation, and particularly relates to a point-line focusing combined solar thermal power generation system.
Background
In a renewable energy power generation system with a high proportion, a novel power system or a power supply system is required to be constructed to support the realization of a double-carbon target, solar thermal power generation has a large-scale long-time heat storage and energy storage effect, can be used as a basic load power supply or a peak regulation power supply, overcomes the disadvantages of volatility, intermittence, discontinuity and the like of renewable energy power generation, improves the stability of the power system, and provides a realization path for realizing the double-carbon target, saving large-scale wind power, regulating peaks of photovoltaic energy storage and the like.
In the existing combined solar thermal power generation system, a heat conduction oil steam generation system is generally adopted in a groove type, a molten salt steam generation system is adopted in a tower type, and then a water supply system is combined. The adopted heat conducting oil has the problems of high-temperature coking, environmental pollution after leakage, bad smell, condensation prevention at the temperature of below 12 ℃ and the like, and the complex system caused by the combination of two media with a molten salt system.
Or supercritical carbon dioxide is adopted as the circulating medium. The existing supercritical carbon dioxide steam turbine has the problems of high-temperature corrosion, sealing and the like, and meanwhile, the reliability of long-term operation of pipelines and valve materials with the temperature of over 700 ℃ is expected to be verified.
Or the same medium of water working medium or molten salt working medium is adopted in the groove type and the tower type. The tower type adopted water working medium is difficult to control under the condition of large heat load and large heat load change rate of the tower type heat absorber, so that the problems of heat transfer deterioration of partial areas of heat absorption gas, tube explosion of molten salt and the like are caused. And the low-temperature section adopts the fused salt as a heat collecting medium in the groove type heat collecting field, so that the high-temperature performance of the fused salt is not fully exerted, the freezing point of the fused salt is higher, more anti-condensation electricity consumption and measures are needed, and the reliability of a rotary joint or a connecting hose of the groove type fused salt needs to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a point-line focusing combined solar thermal power generation system to overcome the defects in the prior art, and the point-line focusing combined solar thermal power generation system utilizes the technical characteristics and advantages of different solar thermal power generation technologies to carry out gradient utilization of energy, fully utilizes the characteristics of working media, reduces the plant power consumption rate, improves the solar thermal power generation efficiency, reduces the system cost, and plays an important role in the development of the solar thermal power generation technology.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a point-line focusing combined solar thermal power generation system comprises a point focusing heat absorber, wherein the point focusing heat absorber focuses heat through a point focusing condenser field, the outlet end of the point focusing heat absorber is connected to a high-temperature heat storage tank, the outlet of the high-temperature heat storage tank is connected to the molten salt side inlet of a superheater and the molten salt side inlet of a reheater, the molten salt side outlet of the superheater is connected to the molten salt side inlet of an evaporator, the molten salt side outlet of the reheater and the molten salt side outlet of the evaporator are jointly connected to the inlet end of a low-temperature heat storage tank, and the outlet end of the low-temperature heat storage tank is connected to the inlet end of the point focusing heat absorber;
the steam side outlet of the superheater is connected to the inlet of a high-pressure cylinder of the steam turbine, the outlet of the high-pressure cylinder of the steam turbine is connected to the steam side inlet of a reheater, the steam side outlet of the reheater is connected to the inlet of a medium-pressure cylinder of the steam turbine, the outlet of the medium-pressure cylinder of the steam turbine is connected to the inlet of a low-pressure cylinder of the steam turbine, the steam exhaust port of the low-pressure cylinder of the steam turbine is connected to a condenser, the condensed water outlet end of the condenser is connected to a plurality of low-pressure heaters which are connected in series through a shaft seal heater, the steam inlet of the low-pressure heater is connected to the steam extraction port of the low-pressure cylinder of the steam turbine, the drain outlets of the low-pressure heaters are sequentially connected in series and then connected to the steam side inlet end of the condenser, the water outlets of the plurality of low-pressure heaters which are connected in series are connected to a deaerator, the steam inlet of the deaerator is connected to the steam outlet of the medium-pressure cylinder of the steam turbine, and the feed water outlet of the deaerator is connected to a plurality of high-pressure heaters which are connected in series, the steam inlet of the high-pressure heater is connected to the steam extraction ports of the high-pressure cylinder and the medium-pressure cylinder of the steam turbine, the drain outlet of the high-pressure heater is sequentially connected in series and then connected to the steam side inlet of the deaerator, and the water outlets of the high-pressure heaters connected in series are connected to the water side inlet of the evaporator through the line focusing mirror field.
Further, the outlet end of the low-temperature heat storage tank is connected to the inlet end of the point focusing heat absorber through a low-temperature molten salt pump.
Further, an outlet of the high-temperature heat storage tank is connected to a molten salt side inlet of the superheater and a molten salt side inlet of the reheater through a high-temperature molten salt pump.
Further, the outlet of the deaerator is connected to a plurality of high-pressure heaters which are connected in series through a water feeding pump.
Further, the outlet end of the condenser is connected to the shaft seal heater through a condensate pump.
Further, the point focusing condenser field adopts a point focusing condenser field of primary focusing or a point focusing condenser field of secondary reflection focusing.
Further, the point focusing condenser field is composed of a plurality of areas of 10-120m2The tracking mirror of (1).
Further, the line focusing mirror field adopts a groove type focusing mirror field or a Fresnel reflection focusing mirror field or a Fresnel transmission mirror field.
Furthermore, the line focusing mirror field is composed of a plurality of reflectors and heat collectors or directly composed of high-temperature vacuum heat collecting pipes in other forms, and the line focusing mirror field is arranged in an array.
Compared with the prior art, the utility model has the following beneficial technical effects:
the whole heat collection and storage system only has two media, the low-temperature section uses water working medium as heat absorbing medium and is used as the preheating section of the heat collection system, a preheater in a common system can be directly saved, meanwhile, the heat conducting oil pollution in the common system is reduced, and the condensation power consumption and the leakage risk are prevented. And simultaneously, the preheated feed water directly enters a fused salt tower type heat exchanger-evaporator. The tower-type high condensation ratio characteristic and the high-temperature section capacity of the molten salt system are fully utilized. The whole system is simple, the operation and maintenance are convenient, the anti-condensation power consumption is less, the energy is utilized in a gradient way, the efficiency of the tower type mirror field and the groove type mirror field is improved, and the cost of the heat collecting system is reduced.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
Fig. 1 is a schematic structural view of a point-line focusing combined solar thermal power generation system according to the present invention.
Wherein, 1, point focusing condenser field; 2. a point focus heat absorber; 3. a high temperature heat storage tank; 4. a low temperature heat storage tank; 5. a high temperature molten salt pump; 6. a low temperature molten salt pump; 7. a superheater; 8. an evaporator; 9. a reheater; 10. a line focusing mirror field; 11. a high-pressure cylinder of the steam turbine; 12. a turbine intermediate pressure cylinder; 13. a low-pressure cylinder of the steam turbine; 14. a deaerator; 15. a condenser; 16. a condensate pump; 17. a shaft seal heater; 18. a low pressure heater; 19. a feed pump; 20. a high pressure heater.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings and embodiments, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a point-line focusing combined solar thermal power generation system, a low-temperature heat collection section replaces a preheater by using the characteristics of low temperature and high mirror field efficiency of line focusing, and a high-temperature section adopts the characteristics of high point focusing temperature and high thermoelectric efficiency, so that the height of a point focusing heat absorber is reduced, and the mirror field efficiency is improved. The solar thermal power generation system has high integration efficiency, low loss and low cost.
The method comprises the steps of focusing heat on a point focusing heat absorber 2 by using a point focusing condenser field 1, connecting a fused salt (or other high-temperature material media) side of the point focusing heat absorber 2 with a high-temperature heat storage tank 3 through a pipeline, connecting a low-temperature fused salt side of the point focusing heat absorber 2 with a low-temperature fused salt pump 6, and connecting a high-temperature fused salt pump 5 with the high-temperature heat storage tank 3, a superheater 7 and a reheater 9. The low-temperature heat storage tank 4 is connected with the inlet of the low-temperature molten salt pump 6 and the high-temperature molten salt side outlet of the evaporator 8. The steam side outlet of the superheater 7 is connected to the inlet of the high-pressure turbine cylinder 11. The outlet of the turbine high pressure cylinder 11 is connected to the steam side inlet of the reheater 9, and the inlet of the turbine intermediate pressure cylinder 12 is connected with the steam side outlet of the reheater 9. The outlet of the line focusing mirror field 10 is connected with the water side inlet of the evaporator 8. The outlet of the high-pressure heater 20 is connected to the inlet of the line focusing mirror field 10. The outlet of the feed water pump 19 is connected to the inlet of the high-pressure heater 20, and the inlet of the feed water pump 19 is connected with the outlet of the deaerator 14. An outlet of the low-pressure heater 18 is connected with the deaerator 14, an inlet of the low-pressure heater 18 is connected with an outlet of the shaft seal heater 17, an inlet and an outlet of the condensate pump 16 are respectively connected with the condenser 15 and the shaft seal heater 17, and the steam exhaust of the steam turbine low-pressure cylinder 13 is connected with the condenser 15.
The line focusing mirror field 10 plays a role in low-temperature preheating and can replace a preheater device in a conventional series of heat exchangers, and the point focusing condenser mirror field 1 can be a primary focusing tower type heat absorption system or a secondary reflection focusing tower type heat absorption system; the line focusing mirror field 10 can be a groove type focusing heat collection system or a Fresnel focusing heat collection system, a small-opening groove type or small Fresnel type heat collection mirror field can be adopted, a heat absorption working medium of the line focusing mirror field 10 is directly coupled to fused salt of the point focusing condenser mirror field 1, water working medium is arranged in the line focusing mirror field 10 and is controlled to have a certain supercooling degree, the temperature of an outlet medium is preferably 230-2The tracking mirror can also be other mirrors with different sizes and shapes.
The point focusing heat collecting mirror field 1 focuses sunlight onto the point focusing heat absorber 2 through primary or secondary reflection, heats the molten salt conveyed by the low-temperature molten salt pump 6 from the low-temperature heat storage tank 4, and the heated molten salt flows back to the high-temperature heat storage tank 3 from the outlet of the point focusing heat absorber 2. The molten salt of the high-temperature heat storage tank 3 is conveyed by the high-temperature molten salt pump 5 to sequentially pass through the superheater 7 and the evaporator 8 and then return to the low-temperature heat storage tank 4. The feed water from the outlet of the high-pressure heater 20 combination is directly or indirectly heated by sunlight through a line focusing mirror field 10, the feed water with increased temperature enters an evaporator 8, absorbs the heat of molten salt to be evaporated into saturated steam, enters the inlet of a superheater 7 from the outlet of the evaporator 8 to continuously absorb the heat of molten salt, generates superheated steam at the outlet of the superheater 7, enters the inlet of a high-pressure cylinder 11 of the steam turbine, the steam after doing work is discharged from the outlet of the high-pressure cylinder 11 of the steam turbine, is heated by a reheater 9 and enters the inlet of a medium-pressure cylinder 12 of the steam turbine, a part of the steam after doing work enters the inlet of a low-pressure cylinder 13 of the steam turbine, a part of the steam enters the steam inlet of a deaerator 14, the steam at the outlet of the low-pressure cylinder 13 enters a condenser to be cooled into condensed water, is conveyed to a low-pressure heater group 15 through a condensed water pump 16, is heated by the extracted steam of the low-pressure cylinder and enters the inlet of the deaerator 14, and the feed water from the outlet of the deaerator 14 is conveyed to the high-pressure heater 20 combination by a feed water pump 19, the feed water heated by the extraction steam of the turbine high pressure cylinder 11 and the turbine intermediate pressure cylinder 12 enters the line focusing mirror field 10.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. A point-line focusing combined solar thermal power generation system is characterized by comprising a point focusing heat absorber (2), wherein the point focusing heat absorber (2) focuses heat through a point focusing condenser mirror field (1), the outlet end of the point focusing heat absorber (2) is connected to a high-temperature heat storage tank (3), the outlet of the high-temperature heat storage tank (3) is connected to a molten salt side inlet of a superheater (7) and a molten salt side inlet of a reheater (9), the molten salt side outlet of the superheater (7) is connected to a molten salt side inlet of an evaporator (8), the molten salt side outlet of the reheater (9) and the molten salt side outlet of the evaporator (8) are connected to the inlet end of a low-temperature heat storage tank (4) together, and the outlet end of the low-temperature heat storage tank (4) is connected to the inlet end of the point focusing heat absorber (2);
the steam side outlet of the superheater (7) is connected to the inlet of a high-pressure turbine cylinder (11), the outlet of the high-pressure turbine cylinder (11) is connected to the steam side inlet of a reheater (9), the steam side outlet of the reheater (9) is connected to the inlet of a medium-pressure turbine cylinder (12), the outlet of the medium-pressure turbine cylinder (12) is connected to the inlet of a low-pressure turbine cylinder (13), the steam exhaust port of the low-pressure turbine cylinder (13) is connected to a condenser (15), the condensed water outlet end of the condenser (15) is connected to a plurality of low-pressure heaters (18) which are connected in series through shaft seal heaters (17), the steam inlet of the low-pressure heaters (18) is connected to the steam extraction port of the low-pressure turbine cylinder (13), the drain outlets of the low-pressure heaters (18) are sequentially connected in series to the steam side inlet end of the condenser (15), and the water outlets of the low-pressure heaters (18) which are connected in series are connected to a deaerator (14), the steam inlet of oxygen-eliminating device (14) is connected to the steam outlet of steam turbine intermediate pressure cylinder (12), and the feedwater exit linkage of oxygen-eliminating device (14) is to high pressure feed water heater (20) of a plurality of series connections, the steam inlet of high pressure feed water heater (20) is connected to the steam extraction mouth of steam turbine high pressure cylinder (11) and steam turbine intermediate pressure cylinder (12), the hydrophobic export of high pressure feed water heater (20) is connected to oxygen-eliminating device (14) steam side entry after establishing ties in proper order, and the water export of the high pressure feed water heater (20) of a plurality of series connections is connected to the water side entry of evaporimeter (8) through line focus mirror field (10).
2. The combined point-line focusing solar thermal power generation system according to claim 1, characterized in that the outlet end of the low-temperature thermal storage tank (4) is connected to the inlet end of the point focusing heat absorber (2) through a low-temperature molten salt pump (6).
3. A point-line focusing combined solar thermal power generation system according to claim 1, characterized in that the outlet of the high temperature thermal storage tank (3) is connected to the molten salt side inlet of the superheater (7) and the molten salt side inlet of the reheater (9) by a high temperature molten salt pump (5).
4. A point-line focusing combined solar thermal power generation system according to claim 1, characterized in that the outlet of the deaerator (14) is connected to several high pressure heaters (20) in series by means of a feed water pump (19).
5. The combined point-line focusing solar thermal power generation system according to claim 1, wherein the outlet end of the condenser (15) is connected to a shaft seal heater (17) through a condensate pump (16).
6. The combined point-line focusing solar thermal power generation system according to claim 1, wherein the point focusing condenser field (1) is a point focusing condenser field of primary focusing or a point focusing condenser field of secondary reflection focusing.
7. The combined point-line focusing solar thermal power generation system according to claim 1, wherein the point focusing condenser field (1) is composed of several areas of 10-120m2The tracking mirror of (1).
8. The combined point-line focusing solar thermal power generation system according to claim 1, wherein the line focusing mirror field (10) is a groove focusing mirror field or a fresnel reflection focusing mirror field or a fresnel transmission mirror field.
9. A combined point and line focusing solar thermal power generation system according to claim 1, characterized in that the line focusing mirror field (10) is composed of several mirrors and heat collectors or other forms of high temperature evacuated solar collector tubes directly, and the line focusing mirror field (10) is arranged in an array.
CN202121812414.6U 2021-08-04 2021-08-04 Point-line focusing combined solar thermal power generation system Active CN215333266U (en)

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