Tower-type solar photo-thermal power generation system adopting fused salt working medium

Abstract

The invention relates to a tower-type solar photo-thermal power generation system adopting a fused salt working medium. The system comprises a solar heat collection device used for collecting solar thermal energy, a heat exchanger connected with the solar heat collection device and used for producing overheated saturated steam and a thermal power conversion device connected with the heat exchanger and used for converting the overheated saturated steam to electric energy. The solar heat collection device comprises multiple tower-type photo-thermal modules. The multiple tower-type photo-thermal modules include the tower-type photo-thermal modules B with distributed heat storage and adopting fused salt as a heat working medium. By means of the tower-type photo-thermal modules B with distributed heat storage and adopting the fused salt as the heat working medium, the power generation efficiency of a power station can be greatly improved, and the energy utilization rate is increased. By means of the modularized solar heat collection device, the construction process of the power station can be simplified, the construction period can be shortened, and the design and investment cost of the power station can be further reduced.

Description

technical field [0001] The invention relates to the field of electric power technology, more specifically, to a tower-type solar thermal power generation system using molten salt working medium. Background technique [0002] The tower type solar thermal power generation system has the advantages of wide temperature field and energy field matching setting, large concentration ratio, high focusing temperature, high energy flux density, high thermal conversion efficiency, and wide application range. Large-scale: development of many solar energy applications such as photothermal power generation, water hydrogen production, seawater desalination, metal smelting, etc. Therefore, the tower solar thermal power generation system is a platform for diversified utilization of solar energy with great potential. [0003] Many developed countries have carried out research on tower solar power generation technology. However, the development of this technology has still been hindered by ma...

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Problems solved by technology

However, the development of this technology has still been hindered by many difficulties. There are two main reasons for this: first, the cost of heliostat tracking is too high, because the precision of long-distance tracking is extremely high, and the gear must be driven without backlash. The harsh production caused by this is the reason for pushing up the tracking cost; second, the scale of power generation is too small, and the expansion of power generation is greatly limited. Since the scale of tower power generation depends on the scale of the heliostat field, the larger the scale of solar thermal power generation, the lower the cost The larger the space, but when the scale of the heliostat field expands to a certain extent, its overall efficiency shows a sharp decline

Therefore, the cost of power generation of the current tower solar power generation system remains high, and there is still a large distance from market requirements.

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