Heat storage system based on combination of optical heat storage and phase change heat storage

Abstract

The invention provides a heat storage system based on the combination of optical heat storage and phase change heat storage. On the one hand, during a trough period of night electricity consumption, athree-phase electric heater electrically heats a phase change material in a phase change heat storage unit, electric energy is converted into heat energy and the heat energy is stored through the phase change material, heat conduction oil is introduced into the phase change heat storage unit, and the heat stored in the phase change material is transferred to the heat conduction oil; on the otherhand, when the daylight is good, a groove-type photo-thermal heat collector continuously heats the heat conduction oil, and the temperature of the heat conduction oil is maintained by using solar energy; and when the industry requires high temperature steam, the heat conduction oil transfers the heat to circulating water through a heat exchanger, and high temperature saturated steam required for production and processing is obtained by flash evaporation and compression. According to the heat storage system, two types of heat storage methods, namely solar energy light heat storage and phase change material phase change heat storage are coupled, excess power at low night electricity consumption peak is used for heat storage, and the heat is transferred to water during the day to produce thesaturated steam that meets process requirements, so that efficient and economical use of energy is achieved.

Description

Technical field [0001] This application relates to the field of heat storage technology, in particular to a heat storage system based on the combination of light heat storage and phase change heat storage. Background technique [0002] As a kind of clean and environmentally friendly renewable energy, solar energy has gradually increased in the proportion of my country's energy structure. However, due to the randomness and volatility of solar energy, large-scale power generation and grid integration have exacerbated grid fluctuations. [0003] Another heat storage method is phase change heat storage, which mainly uses phase change materials to absorb and release heat during the reversible phase change process for energy storage and release. Among them, the phase change material has the advantages of high heat storage density, long working life, good cycle stability and simple control, but the phase change material has low thermal conductivity, and the available temperature range for...

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Problems solved by technology

Among them, phase change materials have the advantages of high heat storage density, long working life, good cycle stability and simple control, but the thermal conductivity of phase change materials is low, and the available temperature range for heat storage and heat release is narrow, which restricts phase change heat storage. way of use

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