Preheating, heat-insulating and anti-freezing device for fused salt heat absorber

Abstract

A preheating, heat-insulating and anti-freezing device for a fused salt heat absorber comprises a photovoltaic solar panel (1), a storage battery (2), a charge-discharge controller (3), an inverter (4), a voltage regulator (5), a transformer (6), an electrode (7) or an electric heater (10). An output of the photovoltaic solar panel (1) is connected with an input of the storage battery (2), an output of the storage battery (2) is connected onto an input of the charge-discharge controller (3), an output of the charge-discharge controller (3) is connected with an input of the inverter (4), an output of the inverter (4) is connected with an input of the voltage regulator (5), an output of the voltage regulator (5) is connected onto an input of the transformer (6), and an output of the transformer (6) is connected with the electrode (7) or the electric heater (10). The preheating, heat-insulating and anti-freezing device can make full use of solar energy overflowing around a light collection port of the heat absorber for preheating, heat insulating and freeze proofing of the heat absorber.

Description

technical field [0001] The invention relates to a preheating heat preservation anti-freezing device for a molten salt heat absorber of solar thermal power generation. Background technique [0002] Molten salt tower solar thermal power generation technology is an integrated technology of heat transfer and heat storage. Due to the high operating temperature and large-scale energy storage that can be achieved, the high efficiency of the power generation system and the long hours of power generation can provide electricity as a base load. Therefore, it is one of the most commercially promising technologies among all renewable energy generation technologies . However, since the melting point of the molten salt used is as high as 210°C, the molten salt is particularly prone to freezing and blocking. In the early French Themis and American solar two power plants, the molten salt heat absorber was frozen and blocked, which led to the shutdown of the power plant. At present, the m...

AI Technical Summary

Problems solved by technology

The main problem of this method is the high cost (about 240,000 US dollars), and the furnace cover is easily deformed under the irradiation of overflowing solar radiation, resulting in a gap between the tube sheet and the furnace cover, and the wind will enter the furnace cover along the gap. Lead to failure of insulation and preheating, resulting in frozen blockage of receiver tube sheets

Patent CN200810102397.X and patent 201110318283.0 respectively describe a passive molten salt heat absorber using heat pipe technology and a molten salt jet impingement heat absorber. Problems of thermal stress damage and local ablation of heat sinks caused by uneven surface heat flow, as well as problems of difficult salt discharge

Patent CN201110139329.2 invented an air and molten salt composite heat absorber, which uses the high-temperature air generated by the air heat absorber to preheat the molten salt pipeline. This invention partially solves the preheating problem of the molten salt heat absorber. However, when there is no high-temperature air at night, the insulation of the molten salt heat absorber still cannot be completely solved.

Moreover, in the above invention, once the heat absorber is blocked by freezing, there is no good thawing measure, and only the concentrated solar energy can be used to directly irradiate the surface of the heat absorber to slowly thaw, which not only has a large thermal stress, but also has a poor thawing effect.

[0003] In short, the problem of thermal insulation, preheating and anti-freezing of molten salt heat absorbers, especially the tube-sheet molten salt heat absorbers with the highest degree of commercialization at present, has not been well solved.

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