Solid medium energy storage system and method based on fluidized bed heating

Abstract

The invention discloses a solid medium energy storage system and method based on fluidized bed heating. The solid medium energy storage system based on fluidized bed heating comprises a heating lifting chamber, a high temperature storage tank, a heat exchange device and a low temperature storage tank which are sequentially connected. High-temperature resistant solid particles such as sand are usedas an energy storage and heat exchange medium of the system. The heating lifting chamber is selected and used as a fluidized bed heating lifting device; and a heating air distribution device is arranged at the bottom of the heating lifting chamber. The upper part of the low temperature storage tank is provided with a feeding device, and the lower part is provided with an overflow port. A returning device is arranged between the low temperature storage tank and the heating lifting chamber. A cold state solid heat storage medium is fed into the low temperature storage tank through the feeding device, is fed into the heating lifting chamber from the low temperature storage tank through the returning device, and is fluidized and heated to become a high temperature solid heat storage medium, and the high temperature solid heat storage medium is stored in the high temperature storage tank. When the high temperature solid heat storage medium is needed, the high temperature solid heat storagemedium is subjected to heat exchange for utilization through the heat exchange device. A low temperature solid heat storage medium obtained after heat exchange is stored in the low temperature storage tank. The solid medium energy storage system has the advantages of simple technical requirements, high comprehensive utilization rate of energy sources and the like.

Description

technical field [0001] The invention relates to a solid medium energy storage system and method based on fluidized bed heating, and belongs to the field of energy storage and utilization. Background technique [0002] In recent years, renewable energy such as wind energy and solar energy has been paid more and more attention as clean energy, and its installed capacity has increased rapidly all over the world, especially in China. However, renewable energy generation is often erratic and cannot meet general electricity demand, especially in regions where wind or solar power accounts for a large share of electricity generation. When thermal power generation or nuclear power generation cannot change with changes in power demand, part of wind / solar power generation must be given up to maintain the stability of the grid, resulting in a huge waste of energy. In addition, China's "Three Norths" (North China, Northeast China, and Northwest China) are dominated by cogeneration units...

AI Technical Summary

Problems solved by technology

However, renewable energy generation is often erratic and cannot meet general electricity demand, especially in regions where wind or solar account for a large share of electricity generation

When thermal power generation or nuclear power generation cannot change with the change of power demand, part of wind power / solar power generation must be given up to maintain the stability of the grid, thus causing a huge waste of energy

In addition, China's "Three North" regions (North China, Northeast China and Northwest China) are dominated by cogeneration units, which are prone to serious "abandoned wind" when heating in winter

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