Solar energy heat storage device and preparation method thereof

Abstract

The invention discloses a solar energy heat storage device. The device is characterized in that the heat storage device has a sealed metal shell, the metal shell is provided with two heat-conducting liquid outlets, wherein one is a cold end outlet, the other is a hot end outlet; solid heat storage medium is arranged in the metal shell, the solid heat storage medium comprises a plurality of solid heat storage bricks, the heat storage bricks are made of glass or a mixture of glass and sandstone; the inside or surface of each heat storage brick is provided with at least two pore paths, grooves or gaps used for the flowing of the heat-conducting liquid, the paths grooves or gaps can be used to form connecting channels which are used for the flowing of the heat-conducting liquid in each heat storage brick or between two adjacent heat storage bricks. The solving approach provided by the invention is to adopt the special bricks which are directly immersed in the flowing and high temperature heat-conducting liquid (heat-conducting oil, molten nitrate or the like) as the solid heat storage medium while metal pipes for separation are not needed to add. The bricks are characterized in that the surfaces of the bricks are made of glass material; the glass material barely has pores and can effectively prevent the penetration of the heat-conducting liquid, therefore the liquid consumption caused by the pores in the bricks which are soaked in the heat-conducting liquid and the fouling problem caused by the pollution of the heat-conducting liquid can not be caused.

Description

Technical field: [0001] The invention relates to the technical field of utilizing solar energy, in particular to a solar thermal storage device and a manufacturing method thereof. Background technique: [0002] Energy storage is a major topic in the development of many green energy sources (solar energy, wind energy). One of the important ways is the storage of heat energy, especially the conversion of solar energy into heat energy and input into heat storage facilities for preservation. The key indicator of heat storage equipment here is the cost per unit of heat storage capacity. [0003] At present, the most widely used is heat storage equipment with an operating temperature of 200°C to 400°C. In this temperature range, many cheap solid heat storage medium materials such as rocks, bricks, and cement can provide heat storage devices with extremely low theoretical costs. . However, in practical applications, it is generally necessary to use heat transfer oil as a heat tr...

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Problems solved by technology

However, the cost of doing so is still significantly higher than that of solid heat storage media, and the security threat caused by the centralized storage of a large amount of high-temperature molten nitrate cannot be ignored.

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