CN111894822A - Dual source steam generation system - Google Patents
Dual source steam generation system Download PDFInfo
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- CN111894822A CN111894822A CN201910373546.4A CN201910373546A CN111894822A CN 111894822 A CN111894822 A CN 111894822A CN 201910373546 A CN201910373546 A CN 201910373546A CN 111894822 A CN111894822 A CN 111894822A
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- heat
- temperature
- oil
- heat storage
- molten salt
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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- 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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/006—Methods of steam generation characterised by form of heating method using solar heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/20—Solar heat collectors using working fluids having circuits for two or more working fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/30—Solar heat collectors using working fluids with means for exchanging heat between two or more working fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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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
- Y02E10/44—Heat exchange systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a double-source steam generation system for a trough-tower combined solar photo-thermal power station, which comprises a molten salt heat storage system, a heat conduction oil heat storage system and a steam generation system. The steam generation system comprises a reheater, a superheater, an evaporator and a preheater; the molten salt heat storage system comprises a hot salt tank and a cold salt tank; the heat storage system of the heat conducting oil comprises a hot oil tank and a cold oil tank. The design loads of the molten salt heat storage system and the heat conduction oil heat storage system are matched according to the heat storage duration and the heat load born by the system. The system combines trough type heat collection and tower type heat collection, the tower type heat collection is used as a high-temperature heat source of the steam generator to heat a high-temperature section of the steam generator, and the trough type heat collection is used as a low-temperature heat source to heat a preheating section of the steam generation system. The double-source steam generation system reduces the fire loss of the whole heat exchange system, improves the utilization efficiency of solar energy, reduces the investment cost of a solar thermal power station and improves the operation safety.
Description
Technical Field
The invention relates to the field of solar thermal power generation, in particular to a tower type photo-thermal power station taking molten salt as a heat transfer working medium and a trough type power station taking heat conduction oil or molten salt as the heat transfer working medium.
Background
At present, the accumulated installed capacity of wind power in China reaches 190GW, and the accumulated installed capacity of photovoltaic exceeds 125 GW. The intermittency of the wind-solar resources presents a great challenge to the utilization of the wind-solar resources. The random renewable energy source is stored for power generation, and the stability of a power grid is affected. Thereby causing a serious problem of wind and light abandonment.
The solar thermal power station matched with the heat storage system can not only stabilize output in a multi-energy complementary system fusing various renewable energy sources, but also can serve as a peak shaving power station to play a role in peak clipping and valley filling.
The invention provides a trough type and tower type solar thermal coupling double-source steam generation system, which successfully solves the defects of low heat collection temperature and low cycle efficiency of a trough type solar thermal power generation system. Meanwhile, the area of the tower type heat collecting field is effectively reduced through the combination of the groove and the tower, the atmospheric attenuation loss and the overflow loss of the tower type heat collecting field are reduced, and the efficiency of the tower type heat collecting system is improved. The invention can effectively reduce the initial investment and the operation and maintenance cost of solar thermal power generation, and has important significance for the commercial popularization of solar thermal power generation.
Disclosure of Invention
The invention aims to solve the problems in solar thermal power generation, combines trough type thermal power generation and tower type thermal power generation, is applied to a photo-thermal power generation system to form a dual-source steam generator system, and provides a high-efficiency and commercialized trough tower combined photo-thermal power station dual-source steam generator system. The invention is characterized in that: the feed water at about 230 ℃ from the high-pressure heater enters the preheater 1 and is heated by heat conduction oil at 390 ℃ from a groove type mirror field (or a high-temperature oil storage tank 10); after heating to about 330 ℃ and approaching a saturated state, the mixture enters an evaporator 4. The temperature of the steam entering the evaporator 4 and the outlet of the superheater 3 reaches 540 ℃, the steam entering the high-pressure cylinder of the steam turbine for acting enters the reheater 2, the temperature of the steam turbine reaches 540 ℃, and the steam entering the medium-pressure cylinder of the steam turbine. The temperature of the fused salt outlet of the evaporator reaches about 340 ℃. Molten salt entering the steam generator is distributed at the inlet, and the flow of the molten salt is distributed according to the heat load of the superheater and the reheater. In cloudy or rainy days, the tower type heat storage system and the groove type heat storage system supply heat to the steam generator system, low-load operation (the lowest THA working condition can reach 25 percent) is kept, and a reasonable operation mode is set according to factors such as heat storage duration, weather prediction results, power load requirements and the like.
The double-source steam power generation system utilizes the advantages of low cost and high commercialization degree of the groove type heat collection and storage system, combines the characteristics of high condensation ratio, high working medium working temperature, high power generation efficiency and the like of the tower type fused salt photo-thermal power generation system, and reduces the investment cost of the photo-thermal power generation system, improves the operation safety and stability and reduces the operation and maintenance cost in a groove and tower combination mode.
Drawings
FIG. 1 is a schematic diagram of a dual source steam generation system.
Detailed Description
The structure of the present invention will be described in further detail with reference to the accompanying drawings.
As shown in the attached drawings, the double-source steam generation system comprises a feed water heater 8, an oil-water heat exchanger (preheater) 7, a brine heat exchanger (evaporator) 4, a salt-steam heat exchanger (superheater) 3, a salt-steam heat exchanger (reheater) 2, a circulating water pump 6, a hot salt tank 1, a cold salt tank 5, a hot oil tank 8 and a cold oil tank 9.
390 ℃ from the trough heat collection field is stored in a hot oil tank 8 or enters a water-oil heat exchanger (preheater) 7 to heat feed water. The oil at the outlet of the preheater 7 enters a cold oil tank 9 for storage or directly enters a groove type heat collection field; the supercooled water heated to be close to a saturated state at the outlet of the preheater enters a brine heat exchanger (evaporator) 4, is heated to saturated steam and then flows out, enters a brine heat exchanger (superheater) 3, is heated to superheated steam and then enters a steam turbine to do work. High-temperature molten salt from the tower type heat absorber enters the hot salt tank 1 or directly enters the steam generator system to heat steam, and flows out of the steam generator 4 to enter the cold salt tank 5 after exchanging heat with water, or directly enters the tower type heat absorber to absorb heat. In the starting process of the steam generation system, the steam generator system needs to be preheated, the steam outlet valve of the evaporator 4 is in a closed state, and because steam is not generated or the quality of the steam does not reach the standard, the circulating water pump needs to be started until high-quality steam is generated in the steam generator, and the steam valve is opened to enable the steam to flow into the superheater and the reheater for heating.
At night, the groove type mirror field and the tower type mirror field do not work, and the steam generator system is heated by using the heat storage working medium in the molten salt heat storage system and the groove heat conduction oil heat storage system. Because the power load is lower at night, the power station can be operated at low load (the lowest THA working condition can reach 25 percent). In different time periods, reasonable operation modes can be formulated for the power station according to factors such as heat storage duration, weather prediction results, power load demands and the like.
Claims (5)
1. The groove tower combines light and heat power station dual-source steam generation system to include: the system comprises a preheater, an evaporator, a superheater and a reheater, and further comprises a heat conduction oil heat storage system and a molten salt heat storage system. The method is characterized in that: the feed water at about 230 ℃ from the high-pressure heater enters a preheater and is heated by 390 ℃ heat conduction oil from a groove type mirror field (or a groove type high-temperature oil storage tank); heating to about 330 ℃ and approaching a saturation state, then entering an evaporator and a superheater, being heated by molten salt from a tower type heat collecting system (or a high-temperature molten salt storage tank), enabling the temperature of an outlet of the superheater to reach 540 ℃, entering a high-pressure cylinder of a steam turbine to do work, then entering a reheater, and then heating to 540 ℃ again to enter a medium-pressure cylinder of the steam turbine. The fused salt entering the steam generator when the temperature of the fused salt outlet of the evaporator reaches 340 ℃ is distributed at the inlet, and the fused salt flow is distributed according to the heat load of the superheater and the reheater. In cloudy or rainy days, the molten salt heat storage system and the heat conduction oil heat storage system supply heat to the steam generator system, low-load operation (the lowest THA working condition can reach 25 percent) is kept, and a reasonable operation mode is set according to the heat storage duration, the weather prediction result, the power load requirement and other factors.
2. The dual source steam generator system of claim 1, wherein the heat transfer oil below 390 ℃ from the trough mirror field (or hot oil storage tank) enters the preheater during its operation. Because the water supply flow and the temperature change along with the change of the operation condition of the unit, the double-source steam generation system fully utilizes the characteristic of low freezing point temperature of a heat transfer oil medium, enlarges the range of the variable working condition of the unit and is beneficial to deep peak regulation of the unit; the heat energy obtained by the groove type heat collecting system is used as a low-temperature heat source of the steam generating system, so that the phenomenon that the heat conducting oil is cracked and deteriorated due to the fact that the groove type heat collecting system is forced to operate in a critical temperature area of the heat conducting oil in order to pursue high circulation efficiency is effectively avoided, the risk of high-temperature cracking of the heat conducting oil is effectively reduced, and the safety margin of the heat conducting oil working medium is improved. The service life of the heat conduction oil is prolonged, the oil change period is prolonged, and the maintenance cost is reduced.
3. The dual-source steam generator system of claim 1, wherein during the operation process, the heat conducting oil below 390 ℃ from the trough mirror field (or the hot oil storage tank) enters the preheater, and because the heat conducting oil has a lower freezing point temperature compared with the molten salt, compared with the molten salt tower-type solar thermal power generation system, the system does not need to be provided with a starting heater of the steam generation system, thereby effectively avoiding the power consumption of the steam generation system in the starting stage, saving the operation and maintenance cost, simplifying the system and saving the investment cost.
4. The dual source steam generator system of claim 1, in operation 565 ℃ molten salt from the tower concentrator (or hot salt tank) enters the superheater, reheater and evaporator as a high temperature heat source. The initial parameters of the thermodynamic cycle are improved, the thermodynamic cycle efficiency is improved, the generated energy is increased, and the electricity consumption cost of solar thermal power generation is effectively reduced. The outlet molten salt temperature of the evaporator was 340 ℃. Compared with the traditional fused salt outlet temperature of the steam generator system of the tower-type power station, the fused salt outlet temperature is increased by 50 ℃, the heat exchange temperature difference in a heat absorber is reduced, and the fire loss in the photo-thermal conversion process is reduced.
5. The dual source steam generator system of claim 1, wherein the molten salt heat storage system and the conduction oil heat storage system are collocated in the tower heat collection system and the trough heat collection system, respectively. In cloudy or rainy days, the tower type heat storage system and the groove type heat storage system supply heat to the steam generator system, low-load operation (the lowest THA working condition can reach 25 percent) is kept, and a reasonable operation mode is set according to factors such as heat storage duration, weather prediction results, power load requirements and the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910373546.4A CN111894822A (en) | 2019-05-06 | 2019-05-06 | Dual source steam generation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910373546.4A CN111894822A (en) | 2019-05-06 | 2019-05-06 | Dual source steam generation system |
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| CN111894822A true CN111894822A (en) | 2020-11-06 |
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| CN201910373546.4A Pending CN111894822A (en) | 2019-05-06 | 2019-05-06 | Dual source steam generation system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202673591U (en) * | 2012-07-25 | 2013-01-16 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Trough and tower solar hybrid power generation system |
| WO2014193224A2 (en) * | 2013-05-27 | 2014-12-04 | Stamicarbon B.V. Acting Under The Name Of Mt Innovation Center | Solar thermal energy storage system |
| CN106089340A (en) * | 2016-07-26 | 2016-11-09 | 康达新能源设备股份有限公司 | Groove type solar conduction oil and fused salt mixing heat power generation system |
| WO2018167597A1 (en) * | 2017-03-13 | 2018-09-20 | De Miranda Carvalho Marco Antonio | System and methods for integration of concentrated solar steam generators to rankine cycle power plants |
-
2019
- 2019-05-06 CN CN201910373546.4A patent/CN111894822A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202673591U (en) * | 2012-07-25 | 2013-01-16 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Trough and tower solar hybrid power generation system |
| WO2014193224A2 (en) * | 2013-05-27 | 2014-12-04 | Stamicarbon B.V. Acting Under The Name Of Mt Innovation Center | Solar thermal energy storage system |
| CN106089340A (en) * | 2016-07-26 | 2016-11-09 | 康达新能源设备股份有限公司 | Groove type solar conduction oil and fused salt mixing heat power generation system |
| WO2018167597A1 (en) * | 2017-03-13 | 2018-09-20 | De Miranda Carvalho Marco Antonio | System and methods for integration of concentrated solar steam generators to rankine cycle power plants |
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Application publication date: 20201106 |
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