Heat storage method of impregnated sandstones and device thereof

Abstract

The invention relates to a heat storage method of impregnated sandstones and a device thereof. According to the heat storage method, a closed container heat storage system in which a pipe frame type heat exchanger pipeline is arranged is filled with sandstones, and conduction oil or fused salt is injected into gaps between the sandstones, so that the sandstones and the pipe frame type heat exchanger pipeline are impregnated into the conduction oil or the fused salt. The heat storage device is provided with a closed container with an insulating layer, a pipe frame type heat exchanger is installed in the closed container, the closed container is filled with sandstones, impregnated media are injected into the gaps between the sandstones, a nitrogen cylinder is arranged outside the closed container, and an outlet of the nitrogen cylinder is introduced into the closed container through a nitrogen pipe. According to the heat storage method, the structure of the impregnated sandstones is adopted, so that the heat transfer performance of the heat storage device can be greatly improved, and the distribution density of heat transfer pipelines in the heat storage device and the power of a transfer pump are reduced. The heat storage method has the advantages of reasonable design scheme and easiness in implementation and application, and the heat storage construction cost can be greatly reduced in the condition that the heat storage requirements are satisfied.

Description

technical field [0001] The content of the present invention belongs to the technical field of heat storage, and relates to a heat storage method and device thereof by impregnating sand. Background technique [0002] In the field of heat storage technology, using cheap and easy-to-obtain sand and stone as heat storage materials has always been the pursuit goal of relevant scientific and technological workers. However, the traditional concrete heat storage equipment and heat storage method, which use sand and gravel as the main heat storage material, and cement as the cementitious material to solidify the sand and gravel and the heat transfer medium pipeline, have the following disadvantages: (1) The cement gelled form The concrete is prone to dehydration at a high temperature above 400°C for a long time, causing destructive structural changes in the concrete structure and detachment of metal pipes, so that air will enter the gaps, greatly reducing the heat transfer performanc...

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Problems solved by technology

However, the traditional concrete heat storage equipment and heat storage method, which use sand and gravel as the main heat storage material, and cement as the cementitious material to solidify the sand and gravel and the heat transfer medium pipeline, have the following disadvantages: (1) The cement gelled form The concrete is prone to dehydration at a high temperature above 400°C for a long time, causing destructive structural changes in the concrete structure and detachment of metal pipes, so that air will enter the gaps, greatly reducing the heat transfer performance of the concrete; (2) , and the rigid heat storage structure glued together with the metal pipes will generate thermal stress due to the difference in expansion coefficient. In the long-term alternating cold and heat environment, the metal pipes and concrete will also be separated, destroying the overall structure, and making the traditional Reduced working life of concrete heat storage equipment

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