Valley electricity energy storage system based on phase change heat storage devices

Abstract

The invention provides a valley electricity energy storage system based on phase change heat storage devices. The valley electricity energy storage system comprises a heat source subsystem, a heat pump subsystem, an energy storage subsystem and a user subsystem, and further includes the phase change heat storage devices for realizing heat storage and heat release. The heat source subsystem can utilize the heat of a sewage source and deep underground soil to realize heat extraction. The heat pump subsystem operates during the period of a nighttime valley electricity price to realize heating. The energy storage subsystem distributes the heat to the phase change heat storage devices to realize heat storage. The user subsystem utilizes the phase change heat storage devices to release the heatindoors to achieve heat supply. The phase change heat storage devices each include a heat exchange structure, an outer cylinder body and a cylinder cover, the outer cylinder bodies are filled with phase change materials, and the heat exchange structures are composed of a plurality of rows of capillary networks which can form a plurality of heat transfer sources on the horizontal cross sections ofthe phase change heat storage devices. The distance between the heat exchange structures and the phase change materials is shortened, and thus the heat storage and heat release speed of the phase change heat storage devices is increased.

Description

technical field [0001] The invention belongs to the field of energy storage, and relates to an energy storage application system, in particular to a valley power energy storage system based on a phase change heat storage device. Background technique [0002] In most areas of our country, a stepped electricity price policy has been implemented. During the daytime when the electricity consumption is at its peak, the electricity price is more expensive, and at the low peak stage of the electricity consumption load - at night, the electricity price is cheap. In addition, since the low power load at night also causes a lot of waste of power resources, it is currently a more feasible solution to make up for the time difference between energy supply and user side through energy storage. Storage of electric energy often requires batteries, resulting in high investment and operating costs for electricity storage, while storing heat can only be achieved through water or phase change m...

AI Technical Summary

Problems solved by technology

However, on the cross-section at the same height, there are only two heat source transfer points to release or absorb heat to the surrounding phase change materials, and the overall heat storage and heat release speed of the phase change heat storage device will be slow

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