Solid-state heat storage structure and processing method

Abstract

The invention provides a solid-state heat storage structure and a processing method. The solid-state heat storage structure is a self-supported three-dimensional through net structure which is formed by aggregates and filling agents with high heat conductivity; filling agent materials are melted to be in a liquid state at a high temperature and permeate into gaps of the mixed aggregates; and after being cooled, the filling agent materials and the aggregates form a whole heat storage solid block. The solid-state heat storage medium of the solid-state heat storage structure has no flowability, and heat can be stored by virtue of the sensible heat property of solids, so that the operation is safe; the whole heat storage medium is compactly integrated, so that the heat conduction among multiple interfaces is enhanced greatly; and moreover, the three-dimensional net structure made of the materials with high heat conductivity is distributed inside the whole heat storage medium space relatively uniformly, so that the transfer of heat energy is enhanced greatly, so that the medium has good heat conductivity wholly. The solid-state heat storage structure is low in cost, good in heat conduction and large in heat capacity, can be applied to various heat storage application, and particularly can be applied to a solar photo-thermal utilization system.

Description

Technical field [0001] The invention relates to a heat storage device and a processing method, in particular to a heat storage device in a solar light and heat utilization system. Background technique [0002] Solar energy is a relatively ideal new energy source, but there is a problem of timeliness in its utilization. The energy received during the sunshine period exceeds the need, and it cannot function after sunset. Therefore, how to store the surplus energy during sunshine for the continuous operation of the system after sunset, that is, to take the surplus to make up for the deficiency, has become a key issue in realizing the continuous operation of the solar thermal utilization device. [0003] In the existing solar energy storage technology, there are reports or used a variety of heat storage media. In recent years, it has been reported that a composite phase change material (shaped phase change material) supported by a specific material as a matrix was obtained in the labo...

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Problems solved by technology

In recent years, it has been reported that a composite phase change material (shape-fixed phase change material) supported by a specific material as a matrix has been obtained in the laboratory to store heat, but it has the disadvantage of low thermal conductivity, and the phase change material occurs during the heat storage process. Phase change, due to the change in volume, it is prone to hidden dangers of leakage

In addition, ternary aluminum alloys are also used in industry as phase change storage materials. Multiple cycles have negative effects on heat storage performance, such as the temperature and life of phase change heat storage, because the heat storage material itself is in the working process. Repeated solid-liquid phase transitions in the environment, impurity elements will affect its performance and service life

At present, the existing industrialized solar thermal power generation units mostly use inorganic salts as heat storage materials, but inorganic salts have the disadvantages of supercooling and phase separation during the phase transition process, which affects the heat storage capacity, and its solidification temperature is too high, As a result, the thermal insulation cycle heat loss at night to ensure that it does not solidify is relatively large. Once the system freezes, it is difficult to dispose of, and there are potential safety hazards; the pumps and valves used in the pipelines of molten salt systems are expensive and have a relatively short service life. Inorganic salts are toxic, easy to leak and cause fire, and leakage will cause environmental pollution

Solid-state heat storage solutions include concrete heat storage, which has high cost and low thermal conductivity, etc.; sandstone heat storage, although cheap, has low thermal conductivity, difficult heat exchange, and cannot be shaped and self-supporting, which affects use; solid metal or alloy Although heat storage has good mechanical strength and high thermal conductivity, it is expensive

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