Overheat protection device and overheat protection method of heat absorber for solar energy photothermal conversion

Abstract

The invention discloses an overheat protection device of a heat absorber for solar energy photothermal conversion. The overheat protection device comprises the heat absorber, a thermoelectric conversion device, an air intake system and a control system; the heat absorber includes a thermal insulation cavity; a heat tube bundle is tightly bonded on the inner wall of the thermal insulation cavity, and is connected with the thermoelectric conversion device; air intake guide pipes and first air collecting tanks are uniformly arranged on the thermal insulation cavity in the peripheral direction; one ends of the air intake guide pipes extend into the thermal insulation cavity, and the other ends are connected with the first air collecting tanks in a sealed mode; the first air collecting tanks are connected with the air intake system in a sealed mode; the control system includes a controller and thermocouples; the multiple thermocouples are uniformly distributed on the heat tube bundle; the thermocouples are electrically connected with the controller; and the controller is connected with the intake system. The device monitors the surface temperature of metal heat tubes in real time; and when the temperature exceeds a heat resisting threshold value of the metal heat tubes, the air intake system is initiated to strengthen the convection loss to reduce the temperature so as to guarantee safe operation of the heat absorber. The invention further discloses an overheat protection method of the heat absorber for solar energy photothermal conversion.

Description

Technical field [0001] The present invention relates to the technical field of solar thermal power generation, in particular to an overheat protection device and an overheat protection method of a heat absorber for solar photothermal conversion. Background technique [0002] In the field of solar thermal power generation technology, due to the low energy flow density of solar energy radiation resources, it cannot be directly collected and utilized. It is often necessary to gather a large area of ​​solar energy on the surface of the metal heat pipe of the heat absorber to make the metal heat pipe The heat exchange working medium flowing inside obtains heat energy, and transmits the heat energy to the thermoelectric conversion device, and then realizes the conversion of sunlight energy into electric energy output. [0003] When designing a solar thermal power generation system, it is often based on the annual average or typical number of days of direct solar irradiance (DNI, unit W / m...

AI Technical Summary

Problems solved by technology

The above-mentioned existing technology 1 and technology 2 are still unable to meet the power generation operation when the solar radiation resources exceed the design value or the metal heat pipe appears in a high-temperature area, and cannot utilize the high-quality solar energy exceeding the design DNI value at noon, which is harmful to the power station. The economic performance is significantly affected by

Images