Protective device of tower type solar heat absorber

Abstract

The invention discloses a protection device of a tower type solar heat absorber, which comprises a protection module arranged around the heat absorber; the memory metal driving module drives the protection module to move, so that the protection module surrounds the periphery of the heat absorber to shield the heat absorber tube panel or expose the heat absorber tube panel; when the environment temperature is lower than the phase change temperature, the memory alloy driving module drives the protection module to shield the heat absorber tube panel, and shielding heat preservation and heat shock prevention are conducted on the heat absorber tube panel; when the environment temperature is higher than the phase change temperature, the memory metal driving module drives the protection module to remove shielding of the heat absorber tube panel, and sunlight can be refocused on the heat absorber tube panel. By using the protection device provided by the invention, a cloud layer monitoring system and an external power source do not need to be additionally arranged, and the system is simple in structure and high in stability; the heat absorber tube panel is shielded and insulated, heat dissipation loss and heat shock on the surface of the heat absorber when a cloud layer skims over are effectively reduced, the efficiency of the heat absorber is improved, and the service life of the heat absorber is prolonged.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation, and in particular relates to a protection device for a tower solar heat absorber. Background technique [0002] The heat absorber is one of the core components in the tower solar thermal power generation system. It mainly absorbs the sunlight reflected and concentrated by the heliostat, and heats the heat transfer medium inside it to generate high-temperature heat energy, which provides the required energy for the generator set. . Among the many heat transfer working fluids, mixed molten salts are widely used in tower CSP stations due to their good thermal conductivity and thermal stability, as well as a wide operating temperature range. [0003] At present, the commercialized molten salt heat absorbers are mainly of the exposed tube type, that is, the sunlight reflected by the heliostat is directly focused on the surface of the heat absorber, which makes the surface tempe...

AI Technical Summary

Problems solved by technology

[0003] At present, the commercial molten salt heat sink is mainly of the exposed tube type, that is, the sunlight reflected by the heliostat is directly focused on the surface of the heat absorbing tube, which makes the surface temperature of the heat sink very vulnerable to the influence of weather conditions and cloud transients

When the cloud layer passes by and is blocked, the energy flow density on the surface of the heat-absorbing pipe drops rapidly, while the high-altitude convective heat dissipation and the radiation heat dissipation from the heat-absorbing pipe to the atmosphere continue to exist, resulting in a continuous decrease in the temperature inside the pipe. In severe cases, the molten salt working fluid will solidify and cause blockage. Tube

At the moment when the cloud cover disappears, the sunlight refocuses, and the surface of the heat-absorbing tube easily forms an excessive energy flow density, causing local overheating, resulting in large thermal fatigue damage, and in severe cases, the tube will burst and cause a safety accident

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