On January 6, 2014, Prof. Xu Chao, School of Energy, Power and Mechanical Engineering of North China Electric Power University, invented the “One-tank and two-tank composite heat storage system and heat storage method for solar thermal power generation†and obtained the invention patent of the State Intellectual Property Office. Authorization. The invention adopts the idea of ​​coupling a single- tank inclined-layer thermal storage subsystem and a dual-tank thermal storage subsystem and combines the advantages of the two thermal storage systems to solve the problem that the single-tank inclined-layer thermal storage technology has low efficiency. The inherent disadvantages such as single operation mode, low heat storage costs, high system efficiency, and flexible operation modes provide a new solution for the development and application of CSP heat storage technology. The heat storage system is a manifestation of the core competitiveness of CSP. Double-tank molten salt heat storage technology is currently the most widely used and most widely used heat storage technology. The two-tank heat storage system has a simple structure and mature technology, but because it has two heat storage tanks, it requires more heat storage medium and higher system cost. The single-tank heat storage system has only one heat storage tank, which has the advantage of lower cost, and is also known as the inclined temperature layer heat storage system. When the heat is released, the high-temperature heat storage medium is pumped by the high temperature pump at the top of the tank and enters the tank from the bottom of the tank after being exothermic cooled by the heat exchanger; when the heat is stored, the low temperature heat storage medium is pumped out by the cryogenic pump at the bottom of the tank. After being heated by the heat exchanger, it enters the tank from the top of the tank. However, due to the complex fluctuation of the solar radiation intensity, the frequent switching between single-tank systems will exacerbate the local turbulence at the inlet and outlet, and gradually reduce the efficiency of the system, resulting in unstable operation of the system. In addition, the single-tank system is difficult to achieve simultaneous charging. , heat release and other operations, the mode of operation is strongly limited. This new invention by Xu Chao and others is based on the configuration of “large single tank plus small double tanksâ€, combining the dual advantages of lower cost of a single tank system and better stability of a two-tank system, and has certain reference for the innovation of heat storage technology. Meaning and value. Its main advantages are in the following five areas: 1. The single-tank regenerative layer thermal storage sub-system undertakes most of the heat storage capacity, and can effectively use the cost advantage of the single-tank regenerative layer thermal storage technology, and couple the dual-tank thermal storage subsystem to increase the heat storage while sharing the cold and heat. Fluid pumps and piping equipment reduce heat storage costs. 2. The dual-tank heat storage subsystem bears a small part of the heat storage capacity, mainly used as a buffer system to cope with the daytime fluctuations, and avoids the frequent charge and discharge exchanging operation of the single-tank inclined-layer storage tank, which intensifies expansion and expansion of the inclined temperature layer. Disadvantages, effectively reduce the degradation of the inclined temperature layer, improve heat storage efficiency and system flexibility. 3. The single-tank and double-tank composite heat storage system will continue the deep heat release after the single-tank temperature storage tank is set to complete the outlet threshold heat release. This part of the thermal fluid below the threshold temperature is stored in the hot fluid storage tank. It not only reduces the impact of the quality of the gradual mixing of hot fluids and cryogenic fluids left in the single-tank tanks, but also improves the heat storage capacity of single-tank tanks, and also enables the use of temperature cascades. The thermal efficiency of the system reduces irreversible losses. 4. The hot and cold fluid pump is arranged in the high and low temperature thermal storage tanks of the relatively small volume double-tank thermal storage subsystem (there is no fluid pump in the inclined temperature single tank), which may reduce the requirements of the depth of the pump and so on. Reduce the cost of the fluid pump. 5. The single-tank and double-tank composite heat storage system has a wide range of applications and can handle complex irradiation fluctuations by adopting different operating strategies; it can be used in a variety of trough or tower solar thermal power generation systems that use liquid as a heat transfer medium. Photovoltaic power generation and heat storage systems have become a necessary prerequisite for the development of solar thermal power stations in China. Under this background, many domestic companies and research institutes are working hard to promote the development and demonstration of new generation heat storage systems. The innovation of the molten salt heat storage system can be started from two aspects. One is the innovation of molten salt heat storage materials, such as the use of low melting point molten salt products to enhance the system heat exchange efficiency, and the second is to innovate heat storage system design, as described in this paper. This new type of heat storage system. These two points are also the key points that industry people worldwide are committed to seeking breakthroughs. Xu Chao told reporters that he has conducted more than four years of research on single-tank heat storage of molten salt, and published many academic papers in international authoritative SCI journals. The recently granted invention patent solved the single-tank heat storage. Some of the inherent disadvantages of the system. He is currently conducting further research on the specific system integration characteristics and economic analysis of the patented technology, hoping to promote the application and technological innovation of domestic CSP heat storage technology. At the same time, in order to promote the demonstration application process of the patented technology as soon as possible, related companies interested in this technology are also welcome to discuss with them some practical cooperation. Xu Chaoyuan, the first inventor of the patent, worked for the Institute of Electrical Engineering of the Chinese Academy of Sciences. The invention was the result of the project's research and development led by the company. The joint inventor of the patent also includes Chang Zhexi, Li Xin and Wang Zhifeng. The patent was filed on May 11, 2013 and granted on January 6, 2015. The patentee was the Institute of Electrical Engineering of the Chinese Academy of Sciences.
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