Binary working medium tower type solar power generating system

Abstract

The invention provides a binary working medium tower type solar power generating system which comprises a water working medium heat absorber, a fused salt heat absorber, an evaporator, a fused salt superheater and a steam turbine generator unit. Fuse salt is involved in the saturated steam generation and superheating process, feedwater respectively enters the water working medium heat absorber and the evaporator, and the feedwater entering the water working medium heat absorber absorbs heat for temperature rise to generate saturated steam. Fused salt absorbs heat for temperature rise in the fused salt heat absorber, then enters the fused salt superheater for heat exchange and finally enters the evaporator to exchange heat with water in the evaporator to generate the saturated steam. The saturated steam generated by the water working medium heat absorber and the evaporator is superheated by the high-temperature fused salt in the fused salt superheater to generate superheated steam for driving the steam turbine generator unit to generate power. The binary working medium tower type solar power generating system reserves the advantages of simplicity in operation, high technical maturity, low construction cost and the like of a water working medium system and is capable of taking the advantage of high heat storage capacity of the fused salt to improve stability in power generation.

Description

technical field [0001] The invention relates to the application field of solar heat, in particular to a binary working medium tower type solar power generation system. technical background [0002] The tower type solar thermal power generation system has the characteristics of high concentration ratio, easy to achieve high working temperature, large system capacity and high efficiency. The heat transfer working medium mainly includes air, water (steam) and molten salt. Most power plants at home and abroad use water (steam) or molten salt as the heat transfer medium. The systems using these two substances as the heat transfer medium have their own advantages and disadvantages: (1) Water is used as the heat transfer medium. Since water has no It is non-toxic, non-corrosive, and easy to transport, so it is widely used in tower solar systems. However, the hydraulic fluid system has no heat storage function and cannot guarantee continuous and stable gas supply. It has poor adapt...

AI Technical Summary

Problems solved by technology

However, the hydraulic fluid system has no heat storage function and cannot guarantee continuous and stable gas supply. It has poor adaptability under variable working conditions and poor system economy; After the heat is heated up, the steam generating device generates steam that meets the needs. The molten salt system operates without pressure and has no phase change. The heat capacity of the molten salt is large, and the heat absorber can withstand high heat flux density. System efficiency; however, the piping of the molten salt system is complex, and due to the high freezing point of the molten salt, in order to prevent the molten salt from solidifying and blocking the pipe, the system has strict requirements on pipeline preheating, equipment insulation, operation and maintenance, etc., so the system control is difficult; in addition, The molten salt system requires a large amount of molten salt circulation, and the cost of molten salt accounts for a large proportion of the operating cost of the system

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