The invention provides an efficient
phase change heat storage
system for solar photo-thermal combined power generation in the
solar industry, which relates to the technical field of the
solar industry and comprises a gradient composite
phase change heat storage unit, a multi-field
coupling cooperative control module, a novel
system integration framework, a double-layer composite heat
storage tank and a two-stage
backup system, the novel
system integration framework is connected with a CPC heat collection field, a photovoltaic array, a multi-stage heat
storage tank and a
heat engine through an intelligent valve network. The gradient composite
phase change heat storage unit and the double-layer composite heat
storage tank are arranged in the multi-stage heat storage tank. The high-thermal-
conductivity, medium-temperature heat storage and high-latent-heat long-acting three-stage gradient
phase change material is arranged in the flowing direction of a
heat transfer working medium, the continuous working condition of rapid heat absorption, stable heat storage and continuous heat release is achieved, the defects that a
single phase change material is low in heat conduction efficiency and uneven in heat charging and discharging rate are effectively overcome, the heat charging and discharging rate is increased, and the
heat transfer efficiency is improved. And the
dynamic energy demand of the photo-thermal
power generation system can be accurately matched.