Solar heat storage and high temperature gas generation system using quicksand as working medium

Abstract

A solar heat storage and high-temperature gas generation system, comprising a sun-tracking concentrating device (1), a heat storage tank (2) and a heat exchange device (3), the working medium of which is quicksand (5). The quicksand (5) is heated by the sun tracking concentrating device (1), and the heated quicksand (5) is transported to the heat storage tank (2). The quicksand (5) is stably output from the heat storage tank (2), and transfers heat to the high-pressure gas or liquid (6) to be heated in the heat exchange device (3) to generate high-temperature and high-pressure gas. The system has the advantages of good heat storage effect, large heat storage, high heat exchange efficiency and low operating cost.

Description

technical field [0001] The invention relates to a system and a method for storing solar energy. In addition, the invention also relates to a system and a method for generating high-temperature gas by utilizing the stored solar energy. In particular, the invention relates to a solar heat storage and high-temperature gas generation system using quicksand as a working medium. Background technique [0002] To achieve large-scale application of solar energy, two key issues are solar energy storage and reducing operating costs. By concentrating solar energy to heat the working medium, high-temperature and high-pressure gas (such as steam or air) can be generated to drive turbines to generate electricity or be used in industry. [0003] The energy in the solar thermal system is stored in the form of heat, which is the best known solution to solar energy storage. However, in order to achieve low-cost, long-term, large-scale heat storage, the key is to choose a heat storage medium ...

AI Technical Summary

Problems solved by technology

[0006] (1) The collector does not take into account the situation of solar energy concentration. As a result, the exposed area is large, resulting in large convection and radiation losses. The maximum temperature of the heated particulate matter cannot be too high, so it cannot be directly applied to high-temperature photothermal systems. and thus cannot be used efficiently to generate electricity or as industrial power

[0007] (2) The surface of quicksand is usually light-colored. When it is directly used to absorb sunlight, it has a high reflectivity to sunlight, so that the energy lost due to reflection is large and the efficiency is low.

[0008] (3) Only a simple cylindrical heat storage tank is given. When the volume increases, the pressure on the circumferential direction of the wall is very large. The solution can only be to increase the thickness of the wall

[0009] (4) The proposed heat exchanger exchanges heat between the fluidized bed particulate matter and the fluid in the pipeline, and the heat exchange efficiency is low due to the direct contact between the pipeline and the air

At present, the existing heat exchange equipment exchanges heat between gas and gas, gas and liquid, and liquid and liquid, and cannot be directly used to realize heat exchange between quicksand and gas or between quicksand and liquid

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