WO2020029422A1 - Système d'utilisation de gradient photothermique solaire à disque - Google Patents

Système d'utilisation de gradient photothermique solaire à disque Download PDF

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Publication number
WO2020029422A1
WO2020029422A1 PCT/CN2018/110368 CN2018110368W WO2020029422A1 WO 2020029422 A1 WO2020029422 A1 WO 2020029422A1 CN 2018110368 W CN2018110368 W CN 2018110368W WO 2020029422 A1 WO2020029422 A1 WO 2020029422A1
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WO
WIPO (PCT)
Prior art keywords
heat
storage
heat exchange
steam
solar
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Application number
PCT/CN2018/110368
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English (en)
Chinese (zh)
Inventor
蒋招梧
赵国军
樊贞圆
杨舟
吕政良
Original Assignee
昆山清芸新能源科技有限公司
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Application filed by 昆山清芸新能源科技有限公司 filed Critical 昆山清芸新能源科技有限公司
Publication of WO2020029422A1 publication Critical patent/WO2020029422A1/fr

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • 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

Definitions

  • the invention relates to a solar energy utilization system, in particular to a dish-type solar photovoltaic thermal energy cascade utilization system.
  • Concentrating solar thermal utilization technology is one of the effective means of solar energy utilization.
  • solar concentrating technology there are four types of solar concentrating technology: trough, tower, dish, and Fresnel.
  • the dish solar technology has a higher concentration factor and can reach a higher temperature level.
  • dish-type solar technology has the advantage of flexible layout and can adapt to a variety of complex terrain conditions. It can not only operate independently as a small power source in remote areas, but also can combine a larger number of dish-type equipment to form a large-scale solar power station.
  • the traditional dish solar system uses a Stirling machine as a power generation device, and its cost has been persistent, and because there is no heat storage system, the output is greatly affected by solar fluctuations.
  • the existing dish solar system has a relatively simple output energy form (mainly electrical output). The wide temperature range brought by the advantages of the high concentration factor of dish solar technology cannot be fully utilized, and a large amount of low-quality heat Can not be effectively used, resulting in low solar energy utilization and conversion efficiency.
  • the technical scheme adopted by the present invention is: a dish-type solar photovoltaic thermal energy cascade utilization system including a solar heat collection system and a solar energy utilization system, and a storage / Heat exchange system
  • the storage / heat exchange system includes at least two cascade storage / heat exchange systems, each storage / heat exchange system is connected to a corresponding solar energy utilization system, between the solar heat collection system and the highest-level storage / heat exchange system
  • the solar heat collection system and the lowest-level storage / heat exchange system, and the adjacent steps of the storage / heat exchange system are connected through a heat transfer medium channel, and the first heat transfer medium flows through the heat transfer medium channel.
  • the first heat transfer medium absorbs heat in the solar heat collection system, it circulates to the highest-level storage / heat exchange system through the heat transfer medium channel to release heat, and then sequentially flows to the next through the heat transfer medium channel.
  • the stage storage / heat exchange system releases heat, releases heat step by step, and then returns to the solar heat collection system.
  • the storage / heat exchange system includes a high-temperature storage / heat exchange system, a medium-temperature storage / heat exchange system, and a low-temperature storage / heat exchange system.
  • the high-temperature storage / heat exchange system is a top-level cascade storage / heat exchange system.
  • the low-temperature storage / heat exchange system is a lowest-level cascade storage / heat exchange system.
  • the high-temperature storage / heat exchange system is connected to a high-temperature power generation system
  • the medium-temperature storage / heat exchange system is connected to a medium-temperature heat utilization system
  • the low-temperature storage / heat exchange system is connected to a low-temperature heat utilization system.
  • the heat transfer medium channel is provided with a power cycle device for providing cycle power for the first heat transfer medium.
  • the high-temperature storage / heat exchange system is a solid heat storage system.
  • the high-temperature power generation system includes a steam generator, a feed water pump, a steam turbine, and a condenser connected in sequence.
  • the steam turbine is connected with a generator, and the solid storage system
  • a second heat transfer medium flows between the heat system and the steam generator, the second heat transfer medium flows into the steam generator through a pipe, the feed water pump pumps fluid water into the steam generator, Water absorbs the heat of the second heat transfer medium and converts it into steam in the steam generator.
  • the steam flows into the steam turbine to do work to drive the generator to generate electricity.
  • the steam after doing the work flows into the condenser and condenses into Water is returned to the feedwater pump.
  • the medium-temperature storage / heat exchange system is an air-steam heat exchanger
  • the medium-temperature heat utilization system is a steam user system
  • an application is provided between the gas-steam heat exchanger and the steam user system.
  • a passage between the gas-steam heat exchanger and the steam user system is provided with a first circulating water pump that provides circulating power for circulating water.
  • the low-temperature storage / heat exchange system is an air-water heat exchanger
  • the low-temperature heat utilization system is a hot water user system
  • an application is provided between the air-water heat exchanger and the hot water user system.
  • a passage between the air-water heat exchanger and the hot water user system is provided with a second water pump for promoting water circulation.
  • the first heat transfer medium is a gas medium.
  • the second heat transfer medium is a gas medium.
  • the solid heat storage system has a built-in heat storage medium, and the heat storage medium is one or more combinations of high-temperature molten salt, magnesium brick, composite phase change material, ceramic, stone, metal, alloy, and concrete.
  • the operating pressure of the gas medium is 0 to 5 MPa.
  • the beneficial effects produced by the present invention include: the system of the present invention adopts a dish-type heat collector, which has a higher light concentration, avoids the cosine loss of solar radiation, significantly improves the optical efficiency of the system, and integrates multi-stage heat with heat storage Utilizing the system, while overcoming the limitations of intermittent and low stability of solar energy, it also improves the overall heat utilization efficiency and economy of the system.
  • the invention uses a gaseous working medium as a heat transfer medium, and solves the problems of flammability, explosiveness and strong corrosion of the traditional heat transfer medium.
  • the storage / heat exchange system provided in the invention effectively solves the fluctuation of solar power output of the traditional power generation system. Sexual impact issues.
  • Figure 1 is a schematic diagram of the basic principle of the system of the present invention.
  • FIG. 2 is a schematic structural diagram of an embodiment of the system of the present invention.
  • Dish-type solar heat collection system 2. High temperature storage / heat exchange system, 3. High temperature power generation system, 4. Medium temperature storage / heat exchange system, 5, Medium temperature heat utilization system, 6, Low temperature storage / heat exchange system, 7, low temperature heat utilization system, 8, power cycle equipment, 9, dish collector, 10, solid heat storage system, 11, steam generator, 12, circulation fan, 13, feed pump, 14, steam turbine, 15, Generator, 16, condenser, 17, gas-steam heat exchanger, 18, circulating water pump 1, 19, accumulator, 20, steam user, 21, gas-water heat exchanger, 22, circulating water pump 2, 23 , Water storage tank, 24, hot water users.
  • the dish solar photovoltaic thermal energy cascade utilization system includes a dish solar heat collection system 1, a high temperature storage / heat exchange system 2, a high temperature power generation system 3, a medium temperature storage / heat exchange system 4, and a medium temperature heat utilization System 5, low-temperature storage / heat exchanger 6, low-temperature heat utilization system 7, power cycle equipment 8, and heat transfer medium pipelines.
  • the dish-type solar heat collection system 1 is connected to the high-temperature storage / heat exchange system 2 and medium-temperature storage in sequence through pipelines.
  • low temperature storage / heat exchange system 6 the high temperature power generation system 3, intermediate temperature heat utilization system 5, low temperature heat utilization system 7 and high temperature storage / heat exchange system 2, intermediate temperature storage / heat exchange system 4 respectively
  • the low temperature storage / heat exchange system 6 is connected, and the power circulation device 8 provides circulating power for the heat transfer fluid in the pipeline.
  • the first heat transfer medium rises to a high temperature through the dish solar heat collection system, carries high-temperature heat, and passes through the high-temperature storage / heat exchange system 2, the intermediate-temperature storage / heat exchange system 4, and the low-temperature storage / heat exchange system 6 to release heat step by step.
  • the heat in the high-temperature section is used to generate electricity through the high-temperature power generation system 3 to achieve electrical output, and the heat in the middle and low temperature sections is used for the heat of the temperature counterpart through the medium-temperature heat utilization system 5 and the low-temperature heat utilization system 7, respectively.
  • the heat carried by the heat transfer fluid thus completes the energy cascade. Use, and finally return to the power cycle equipment 8 to complete a cycle.
  • the dish solar concentrating system is composed of a dish concentrator 9 or a circuit composed of several dish concentrators 9 connected in series and connected in parallel.
  • a single dish concentrator 9 has a condensing area of 10 m 2 to 500 m 2. .
  • the heat transfer fluid is one of air, nitrogen, helium, and carbon dioxide.
  • the operating pressure is 0 to 5 MPa, and the temperature is 300 to 1000 ° C. It has been verified that the operating pressure and temperature can effectively improve the energy density.
  • a high-temperature storage / heat exchange system stores a heat storage medium, which is one or more combinations of high-temperature molten salt, magnesium brick, composite phase change material, ceramics, stones, metals and alloys, and concrete.
  • the high-temperature power generation system is one of the Rankine cycle power generation system, supercritical carbon dioxide Brayton power generation system, Stirling power generation system, and compressed air power generation system.
  • Medium temperature storage / heat exchange system whose heat storage medium is one or more combinations of water, molten salt, magnesium brick, composite phase change material, ceramics, stones, metals and alloys, and concrete.
  • the medium temperature heat utilization system is one or a combination of industrial heat, power station water preheating, thermal refrigeration, and agricultural drying.
  • a low-temperature storage / heat exchange system whose heat storage medium is one or a combination of water, a low-temperature phase change material, and a low-temperature composite phase change material.
  • Low temperature heat utilization system one or a combination of building heating, domestic water, water purification, and commercial laundry.
  • the high-temperature storage / heat exchange system 2, the intermediate-temperature storage / heat exchange system 4, and the low-temperature storage / heat exchange system 6 are a solid heat storage system 10, an air-vapor heat exchanger 17, and an air-water heat exchanger 21, respectively.
  • the first heat transfer medium selects air, rises to a high temperature in the dish solar concentrating system 1, and sequentially passes through the solid heat storage system 10, the gas-steam heat exchanger 17, and the gas-water heat exchanger 21 to release heat step by step.
  • the hot fluid finally returns to the power cycle equipment 8 to complete an energy step utilization cycle.
  • the high-temperature section includes a solid heat storage system 10 and a high-temperature power generation system 3.
  • the high-temperature power generation system 3 includes a steam generator 11, a feed pump 13, a steam turbine 14, a generator 15, a condenser 16, and a plurality of pipes.
  • a circulating fan 12 is provided between the steam generator 11 and the steam generator 11 to provide circulating power for the second heat transfer medium.
  • the solid heat storage system 10 absorbs the heat of the first heat transfer medium, and releases the heat to the second heat transfer medium conveyed by the circulating fan 12, the second heat transfer medium is air.
  • the air delivered by the circulating fan 12 absorbs the stored heat from the solid heat storage system 10.
  • the heat-absorbing air passes through the steam generator 11 to heat the feed water delivered by the feed pump 13 into steam.
  • the steam enters the turbine 14 to drive the generator 15 and the steam after doing work enters the condenser 16 to condense into liquid water and returns to the feed pump 13 to complete a Power generation cycle.
  • the heat storage medium in the high-temperature storage / heat exchange system 2 is a liquid medium such as molten salt or water
  • the second heat transfer medium is the heat storage medium.
  • the middle temperature process is: when the solar energy is sufficient, the first heat transfer medium that has cooled down through the solid heat storage system 10 enters the gas-steam heat exchanger 17, and the first circulating water pump 18 transports water into the gas-steam heat exchanger 17 to generate a certain Working conditions of steam, steam is stored in the accumulator 19, to meet the steam user's all-weather demand for steam 24.
  • the low-temperature process is: when the solar energy is sufficient, the first heat transfer medium that is further cooled by the gas-vapor heat exchanger 17 enters the gas-water heat exchanger 21, and the second circulating water pump 22 transports water into the gas-water heat exchanger 21 generates hot water under a certain working condition, and the hot water is stored in the water storage tank 23 to meet the hot water demand of the hot water user 24.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Photovoltaic Devices (AREA)

Abstract

Système d'utilisation de gradient photothermique solaire à disque, comprenant un système de collecte de chaleur solaire (1) et un système d'utilisation solaire, dans lequel un système de stockage/échange de chaleur est disposé entre le système de collecte de chaleur solaire et le système d'utilisation solaire, et comprend au moins deux systèmes de stockage/échange de chaleur à gradient; et chaque système de stockage/échange de chaleur est connecté au système d'utilisation solaire correspondant. Selon le système, une utilisation en plusieurs étapes d'énergie est adoptée pour améliorer l'efficacité d'utilisation d'énergie.
PCT/CN2018/110368 2018-08-10 2018-10-16 Système d'utilisation de gradient photothermique solaire à disque WO2020029422A1 (fr)

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Application Number Priority Date Filing Date Title
CN201810909403.6A CN109099605A (zh) 2018-08-10 2018-08-10 一种碟式太阳能光热能源梯级利用系统
CN201810909403.6 2018-08-10

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WO2020029422A1 true WO2020029422A1 (fr) 2020-02-13

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CN112944697A (zh) * 2021-02-05 2021-06-11 国网综合能源服务集团有限公司 一种太阳能光热/光伏综合能源梯级利用系统
CN115095494A (zh) * 2022-06-21 2022-09-23 国家电投集团科学技术研究院有限公司 光伏光热系统

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