Packed bed heat storage device and preparation method of heat storage ball

Abstract

The invention discloses a two-layer variable ball diameter packed bed heat storage device and provides a preparation method of a heat storage ball. A large-diameter heat storage ball is arranged on the upper layer of the packed bed heat storage device, and a small-diameter heat storage ball is arranged on the lower layer of the packed bed heat storage device. The packed bed heat storage structurecomprehensively considers two important evaluation indexes of the heat storage device, namely heat storage rate and heat storage density, the maximum heat storage rate of the packed bed heat storage device serves as a design principle, and an optimal combination of diameters of the heat storage balls in the packed bed is obtained by virtue of an optimization design, so that the heat storage devicehas optimal heat storage performance. According to the preparation method of the heat storage ball provided by the invention, the heat storage ball with advantages of high heat storage density, excellent heat-conducting property, high mechanical strength, excellent sealing property and simple preparation process can be prepared.

Description

Technical field [0001] The invention relates to the technical field of thermal energy storage, in particular to a packed bed heat storage device capable of improving the comprehensive performance of a packed bed heat storage device and a preparation method of a heat storage ball. Background technique [0002] As a clean, pollution-free renewable energy source, solar energy has the advantages of huge reserves and wide sources. Therefore, solar energy utilization technologies based on the use of photovoltaic conversion and photothermal conversion of solar energy have been widely used and researched. Among them, solar thermal power generation technology has attracted attention because of its advantages such as low environmental pollution, mature technical routes, and stable power output. However, due to the intermittent and discontinuous problems of solar energy, heat storage devices are required in solar thermal utilization. Store the excess energy and release it when needed. In t...

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Problems solved by technology

[0003] At present, for the heat storage performance of heat storage devices, the commonly used evaluation indicators are heat storage rate (heat storage per unit time) and heat storage density (heat storage per unit mass), but the evaluation angles of the two are single, often for a same The relationship between the two heat storage devices is one ebb and flow and cannot be unified. In the early stage, the inventor proposed a comprehensive index that comprehensively considers heat storage time and material quality—heat storage rate density, that is, the heat storage rate density per unit material mass. Heat rate, which comprehensively considers the two key evaluation indicators of heat storage rate and heat storage density, is used as an evaluation method for the heat storage performance of the heat storage device. When the heat storage rate density is the highest, the overall heat storage performance of the heat storage device optimal

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