In order to further play the demonstration and leading role of new technologies, products and equipment in improving energy efficiency in all industries, "Zhejiang Development and Reform" has specially launched a series of tweets titled "New Energy-saving Technologies and Products" for exchange and learning. This propaganda is the testimony of western resources docking with the "intelligence" in the east of central Germany makes the solar-thermal power stations, it makes the solar-thermal power generation and its extension of relying on the advantage of its own inherent for the sustainable development of green industry chain, optimizing the local ecological environment, let's make the xiangyang and unlimited scenery at the same time, more levels in appearance.
Zhejiang has the national leading technology research and development and equipment manufacturing advantages in light and heat collection, heat storage and exchange, steam turbine and other aspects, and has formed a relatively complete solar thermal power generation industry chain. Delingha city in Qinghai province is rich in direct solar radiation resources and has vast land resources, making it an ideal area for the construction of solar thermal power stations. Therefore, the resource advantages of the west and the technological advantages of the east collide, creating a solar thermal power industry in the Gobi Desert. Upon signing facilitate green headquarters in zhejiang province, zhejiang in the light of new energy technology co., LTD and zhejiang curzon technology co., LTD. (formerly zhejiang central solar energy technology co., LTD.) it makes the joint investment in the development of the two commercial solar-thermal power tower, the qinghai central make ha 10 mw and 50 mw molten salt solar-thermal power tower. Among them, the national first solar thermal power generation demonstration project -- Qinghai Zhongcontrol Delingha 50MW molten salt tower solar thermal power Station project is the largest single investment project in zhejiang's matching support project for Qinghai.
The paper introduces the principle, current situation, application scenarios and results of the technology with the title of "Tower solar thermal Power generation and molten salt storage: Optimizing ecological environment with renewable energy".
First, technical principle
Tower solar-thermal power generation technology by driving an orderly real-time massive heliostat tracking the sun, focusing the sun's light onto the heat absorber, which is located at the top of the tower by high temperature molten salt storage heat energy and heating medium, high temperature and high pressure steam produced by the steam turbine turns a generator power, achieve the light energy, heat energy, mechanical energy, electric energy conversion.
Ii. Technical status quo
Research production technology, establish the whole industry chain. Enterprises in Zhejiang province have complete intellectual property rights, and have established the whole industrial chain of solar thermal power generation, realizing the industrialization and localization of core equipment. The overall solution of tower molten salt energy storage photothermal power generation mainly includes light and heat collection system (intelligent helioscope and mirror field control system), heat absorption system, heat storage and exchange system, power generation system, automatic cleaning system related to optimized operation, cloud prediction system, etc.
High precision focusing, full intelligent correction. It is composed of high-precision intelligent heliostat and large-scale mirror field cluster control system, which directly reflects and focuses the scattered solar radiation to the heat absorber on the top of the central heat absorption tower, so as to realize the concentration of solar energy. Full mirror field automatic correction, no manual on duty.
Large - scale spotlight, safe production. It can support a large-scale heliostat field composed of 100,000 helioscopes, with a total concentrating area of 2 million square meters and the farthest distance of the mirror tower up to 2km. Control system power supply, communication adopt redundancy design; Heliostat has strong weather resistance, operating temperature range of -40℃~65℃, working wind speed of 24m/s, living wind speed of 40m/s.
Can realize 24 hours continuous and stable power generation. Molten salt energy storage system mainly consists of molten salt heating system, molten salt heat storage system and steam generation system. Excess heat energy is stored in molten salt when there is plenty of solar light, and it is converted into electricity through a turbo-generator set during peak hours in the morning and evening. Through the configuration of molten salt energy storage facilities, the power station can smooth the power generation curve, improve the stable operation capacity of the power system, and achieve 24 hours of continuous and stable power generation.
Three, application scenarios
Tower solar thermal power generation technology and equipment have been successfully applied in many solar thermal power stations, and the performance assessment is excellent after operation, which fully verifies the advanced and reliability of tower molten salt energy storage solar thermal power generation technology independently developed by China.
Fourth, the application effect
Fast start and stop, safe and reliable. Using a variety of molten salt mixed eutectic as energy storage medium, the energy storage of large capacity, safe and reliable, low cost and high grade is realized. Can do fast start and stop, a wide range of rapid load change; The process of molten salt system basically realizes automatic operation, which greatly reduces problems such as freezing and blocking, overtemperature and load instability caused by improper operation, and improves the reliability of the whole system.
Flexible peak regulation, strong adaptability. With high reliability and high power electric heater products, the power range of a single medium high voltage heater is 5-30MW, through the system series and parallel with GW level energy storage capacity, to meet the needs of users flexible peak and frequency modulation and other working conditions.
Safe mode, efficient storage. For energy storage equipment such as mirror field heat collection system, electric heater and molten salt heat exchanger, there are different modes of safe and fast start and stop strategies. It can realize fast and efficient storage for wind and photoelectric energy with large fluctuation and strong randomness.