Straight-flow-type vaporization system for solar photo-thermal power generation

Abstract

The invention discloses a straight-flow-type vaporization system for solar photo-thermal power generation. The straight-flow-type vaporization system includes an evaporator, a separator and an overheating reheater, wherein the evaporator, the separator and the overheating reheater are connected through pipelines, a steam pocket and a preheater are not included, the evaporator and the overheating reheater are both spiral winding pipe type heat exchangers arranged vertically, heat transfer mediums in the evaporator and the overheating reheater correspondingly pass the shell sides, water and/or vapor correspondingly pass the pipe sides, and heating of vapor from the separator and heating of cold reheating vapor from a steam turbine are both conducted in the overheating reheater. According tothe straight-flow-type vaporization system, the steam pocket and the preheater are not included, number of heat exchangers is reduced, all the heat exchangers are vertical-type devices, during power off, the heat transfer medium can be automatically discharged from the lower part, thus the speeds of starting, stopping and load varying of the system are increased; the process is compact and reasonable, an overheater and the reheater are combined to be one device, and cost of investment, operation and maintenance is lowered; and heat exchanging pipes in all the heat exchangers are distributed ina winded mode and have good flexibility, and the problem of differential temperature stress of the pipe sides and the shell sides can be solved without setting device expansion joints.

Description

technical field [0001] The present invention relates to the technical field of solar thermal power plants, and more specifically, relates to a direct-flow evaporation system for solar thermal power generation. Background technique [0002] Photothermal power generation is a new utilization method of solar energy, which has the advantage of providing good quality power supply through heat storage. Conventional solar-thermal power plant evaporation systems mostly include preheaters, evaporators, steam drums, superheaters, reheaters and other equipment. , the problem of reducing the utilization efficiency of optical resources due to slow start-stop speed is even more prominent. Therefore, it is necessary to design a direct-flow solar thermal power station evaporation system to increase the start-up and stop speed. [0003] On the other hand, with the further improvement of the performance of the heat transfer medium and the optimization of the heat utilization of the whole pl...

AI Technical Summary

Problems solved by technology

For the former scheme, the expansion joint is always the weak link; for the latter scheme, it is difficult to drain because some equipment is equipped with shell-side partitions

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