Tower type solar heat absorber with heat storage capacity

Abstract

The invention provides a tower type solar heat absorber with heat storage capacity. The tower type solar heat absorber comprises a heat absorption screen, wherein the heat absorption screen is erectedand circumferentially arranged around the center of the heat absorber, and the heat absorption screen comprises an upper header, a lower header and heat absorption pipes which are fixedly connected with the upper header and the lower header through connecting pipes and are arranged in rows; the heat absorption screen is further provided with a heat storage and insulation device, the heat storageand insulation device comprises a header insulation device and a heat absorption pipe heat storage and insulation device, and the header insulation device surrounds the upper header, the lower headerand the connecting pipes; and the heat absorption pipe heat storage and insulation device is arranged on the backlight sides of the heat absorption pipes. The tower type solar heat absorber is provided with the heat storage and insulation device, the heat storage and insulation device can insulate the upper header, the lower header and the heat absorption pipes respectively, the heat storage and insulation mode that thermochemistry of the heat storage and insulation device is matched with electric heat tracing enables the adaptability of the heat absorber to weather changes to be higher, blockage caused by condensation of fused salt in a pipeline is prevented, the overall reliability of the heat absorber is improved, the service life of the heat absorber is prolonged, and the maintenance and use cost is reduced.

Description

technical field [0001] The invention relates to the technical field of research and development of tower-type solar heat absorbers, in particular to a tower-type solar heat absorber with heat storage capacity. Background technique [0002] In the tower type solar thermal power generation system, a vast site is required to arrange a large number of heliostats. Each heliostat realizes real-time tracking of the sun and reflects sunlight to the heat sink. The heat absorber located on the high tower absorbs the high heat flux radiation energy reflected by the heliostat system, and converts it into high temperature heat energy and transmits it to the heat transfer medium. The high-temperature heat-transfer working medium is transferred to the steam generator on the ground through pipelines to generate high-pressure superheated steam to drive conventional steam turbines to generate electricity. Due to the use of high tower focusing, a typical tower solar thermal power generation ...

AI Technical Summary

Problems solved by technology

For this kind of heat absorber, the light-receiving surface of the heat-absorbing screen not only receives the solar radiation reflected by the heliostat field, but also directly contacts with the external environment, so there is a large heat loss

The change of weather conditions has a great impact on solar radiation, which in turn will affect the temperature of the heat transfer medium at the outlet of the heat absorber.

For example, when a cloud layer floats over the heliostat field, the solar radiation received by the heat absorber will decrease sharply, or even drop to zero; at this time, the high-temperature tube wall of the heat absorber will dissipate heat to the outside in the form of radiation and convection , resulting in a rapid drop in wall temperature

In severe cases, it may cause the solidification of the molten salt working fluid in the heat absorber

In addition, when the clouds drift away from the heliostat, the solar radiation received by the heat absorber will increase sharply; because the temperature of the tube wall is already low at this time, it will lead to a sharp increase in the wall temperature of the heat absorber, and changes in weather conditions It will cause drastic changes in the wall temperature of the heat absorber, shorten the service life of the heat absorber, and even cause the heat absorber to burst, causing safety accidents

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