Tower type solar fused salt heat absorber heat preservation structure

Abstract

The invention discloses a tower type solar fused salt heat absorber heat preservation structure. The tower type solar fused salt heat absorber heat preservation structure comprises an inlet / outlet container heat preservation module and a straight segment pipe row heat preservation module. The inlet / outlet container heat preservation module is arranged outside an inlet container and / or an outlet container of a heat absorber and comprises a box body structure unit, a box body heat preservation unit and a first electric heating unit. The straight segment pipe row heat preservation module is arranged at the backlight side of a straight segment pipe row of the heat absorber and comprises an inner protection plate, a second electric heating unit and a second heat preservation assembly. Accordingto the tower type solar fused salt heat absorber heat preservation structure, a double-seal structure is adopted at the contact position of a heat preservation box and the straight segment pipe row of the heat absorber, so that air leakage of a contact surface is avoided; it is guaranteed that a heat-absorbing tube expands and contracts freely, and the heating effect and the heat preservation effect of an electric heater are guaranteed; meanwhile, the fixation mode of a heat preservation material is optimized, and the heat preservation structure is simplified; and in addition, by means of theheat preservation structure, modularization can be achieved easily, site construction can be conducted conveniently, and difficulty of overhead work is lowered.

Description

technical field [0001] The invention relates to the technical field of solar thermal power generation, and more specifically, relates to a thermal insulation structure of a tower-type solar molten salt heat absorber. Background technique [0002] The heat absorber is one of the core equipment of the tower-type solar thermal power station. It receives and converts the solar energy focused by the heliostat into the heat energy of the working medium. The steam required by the gas drives the steam turbine to do work, thereby realizing solar thermal power generation. [0003] For tower solar thermal receivers, whether it is the external surface heating type or the cavity type internal surface heating type, the heating surface usually adopts a tube-wall structure, that is, the heat-absorbing medium flows in the tubes, and the tubes are arranged in a plane or an arc surface. According to the characteristics of the high concentration ratio of the tower solar power plant, the light-...

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Problems solved by technology

[0005] The tube panel of the heat absorber and the insulation cover are generally designed to be in flexible contact, but the insulation cover is easily deformed after being heated, so that the distance between the contact surface of the insulation cover and the tube panel gradually increases; On high towers, the high-altitude wind level is equivalent to the hurricane level. Under the strong convection of high-altitude cold air, the insulation effect will be greatly reduced. In severe cases, it will be difficult for the heater to preheat the inlet and outlet headers to the set temperature.

At the same time, there are no fins between the heat-absorbing tubes of the light-pipe heat absorber, and the insulation material is difficult to fix

The common method of adding reinforcing ribs on the outer shield and carrying the load of the thermal insulation structure through the reinforcing ribs often affects the use effect due to the complex structure and difficulty in rooting.

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