Heat storage device for tower type photo-thermal power station

Abstract

The invention discloses a heat storage device for a tower type photo-thermal power station. The device comprises a body, a solid heat storage component, a fluid inlet, a heat supply component and a fluid outlet; a containing cavity is formed in the body; the solid heat storage component is arranged in the containing cavity; the fluid inlet is formed in the body and is used for introducing heat exchange fluid into the containing cavity; the heat supply component is arranged in the containing cavity, and a heat supply working medium is introduced into the heat supply component; the fluid outlet is formed in the body and is used for enabling the heat exchange fluid to flow out; the heat exchange fluid in the containing cavity makes contact with the heat supply component and the solid heat storage component, and the heat exchange fluid absorbs and stores heat of the heat supply working medium; and the solid heat storage component conducts, absorbs and stores heat of the heat supply working medium through the heat exchange fluid, or the heat exchange fluid absorbs and stores heat released by the solid heat storage component. The device is stable and reliable in heat storage structure and low in cost.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation, and in particular relates to a heat storage device for a tower-type solar thermal power station. Background technique [0002] The heat storage device is the core equipment of the tower-type photothermal power station. It stores heat when there is sufficient sunlight, and releases heat during periods of insufficient sunlight, such as at night, to achieve continuity of power output. Therefore, the performance of the heat storage device determines the continuity of power output, so the heat storage device needs to be paid attention to. [0003] The current heat storage device has a variety of heat storage methods, including molten salt heat storage and solid heat storage, but the unit heat storage cost of molten salt heat storage is higher than that of solid heat storage, and solid heat storage is a relatively cheap heat storage method , has received extensive research and e...

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Problems solved by technology

[0004] However, as far as the current solid heat storage technology is concerned, there are still obvious problems: 1. The heat exchange tube is in direct contact with the solid. As the temperature rises, due to the difference in thermal expansion coefficient, the solid structure will be broken; 2. Between solids, Due to thermal expansion, mutual extrusion will also occur, resulting in structural damage; 3. At present, it is more conventional to exchange heat between gas and solid, but the heat exchange efficiency is low

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