Geometrical shape dynamic adjustment device of receiving window of solar cavity type heat absorber

Abstract

The invention discloses a geometrical shape dynamic adjustment device of a receiving window of a solar cavity type heat absorber. The geometrical shape dynamic adjustment device comprises a plurality of baffle devices, temperature sensors and a control system. The baffle devices are arranged at a cavity opening and comprise movable baffles, gear racks, guide rails, gears, sliding blocks, fixed frames and motors. The gear racks and the sliding blocks are arranged on the movable baffles in parallel. The guide rails and the motors are arranged on the fixed frames. The gears are arranged on output shafts of the motors and engaged with the gear racks. The sliding blocks are matched with the guide rails. Probes of the temperature sensors are fixed to the movable baffles. The temperature sensors and the motors are connected with the control system through a data line. Different receiving window shapes can be formed, light energy is effectively received, and meanwhile the area of the receiving window is reduced to the largest degree; and radiation heat losses and convection heat losses can be effectively reduced, and the function of cutting off a light source during overheat protection or faults of the heat absorber is achieved.

Description

technical field [0001] The invention relates to the technical field of solar photothermal power generation, and more specifically relates to a dynamic adjustment device for the geometric shape of a receiving window of a solar cavity heat absorber. Background technique [0002] In the field of solar thermal power generation technology, due to the low energy flow density of solar radiation received by the ground, it is often necessary to gather a large area of ​​solar energy to the surface of the metal heat pipe of the heat absorber, so that the heat exchange working medium flowing inside the metal heat pipe can obtain heat energy. , and transmit the heat energy to the thermoelectric conversion device, and then realize the conversion of solar light energy into electrical energy output. In the above light-to-heat-to-electricity conversion process, the solar light-to-heat conversion is realized with the heat absorber as the carrier, and the heat absorber is the key to improving ...

AI Technical Summary

Problems solved by technology

[0004] Currently, the Chinese patent CN103604230A discloses a protection device for a dish-type solar thermal power generation system, which realizes whether to cut off the solar energy by controlling the linear movement of a shading component, and is aimed at the overheating protection of the metal pipeline of the heat sink. The proposed technical solution only has the ability to change the receiving window area of ​​the simple heat absorber, and cannot meet the requirements of changing the shape of the receiving window in the actual operation of the photothermal power generation system.

In addition, in order to reduce the convective loss of the heat absorber, it was proposed to install a quartz cover at the cavity of the heat absorber, but this technical solution is difficult to manufacture due to the large-area high-transmittance quartz cover, and the installation of quartz at the cavity of the heat absorber The cover plate is prone to uneven temperature distribution, which leads to thermal stress damage to the quartz cover plate. Therefore, the use of quartz cover plates to solve heat loss is still in the experimental stage, and it has not effectively solved the problem of heat loss in the actual operation of cavity heat absorbers.

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