Plate type heat absorber for tower type solar thermal power generation

Abstract

A plate type heat absorber for tower type solar thermal power generation comprises a heat absorbing plate (1) and at least one flat plate or groove type bent plate capable of absorbing radiation indirectly. The heat absorbing plate (1) and the flat plate or groove type bent plates capable of absorbing radiation indirectly are parallelly disposed closely, and a long and narrow crack between the heat absorbing plate and each flat plate or groove type bent plate capable of absorbing radiation indirectly is used as a long and narrow channel (2) for heat absorbing working media to flow through. Portions, which are positioned on an upstream and a downstream of the heat absorbing working media, of each long and narrow channel (2) are respectively connected with an inlet and outlet pipe of a heat absorber body by two reducing flat channels. A high-absorption coating is coated on one surface, which faces to solar radiation, of the heat absorbing plate (1), and a turbulent flow element (11) is arranged on the other surface, which faces to a heat absorbing channel, of the heat absorbing plate (1). The heat absorbing plate (1) is arranged on a daylight opening or inside the heat absorber body far away from the daylight opening. The plate type heat absorber can be used for medium and high-temperature solar power generation and other fields of utilization of medium and high-temperature solar heat.

Description

technical field [0001] The invention relates to a high-temperature heat absorber for tower-type solar thermal power generation, in particular to a plate heat absorber. Background technique [0002] Concentrating solar thermal power generation technologies generally include trough, Fresnel, tower and dish technologies, among which tower technology can achieve higher heat absorption temperature and then generate higher operating parameters, and the overall efficiency of the power station is higher . The heat absorbers currently used in tower solar thermal power generation mainly include water / steam, heat transfer oil, molten salt, air and liquid metal according to the working medium. The structure of the water / steam heat absorber is similar to that of a coal-fired boiler in a power station. It is usually composed of a water wall, a superheater, and a reheater. It is mainly composed of stainless steel tubes. The supercooled water is heated to saturated steam in the heat absorb...

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Problems solved by technology

This also leads to a serious uneven temperature distribution of the stainless steel tubes, which makes the stainless steel tubes face creep fatigue failure caused by multiple starts and stops

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