Salinity difference cycle power generation system and method based on phase change material and solar photo-thermal

Abstract

The invention discloses a salinity difference cycle power generation system based on a phase change material and solar photo-thermal, which comprises a solution supply device, a power generation device and an electric energy output device, and is characterized in that the solution supply device provides seawater with high and low concentration as a salinity difference source of the power generation device; the power generation device realizes a day-night circulating salinity gradient power generation effect; the electric energy output device stores electric energy, one part provides pump work internally, and the other part serves as system output. The invention further provides a salinity gradient cycle power generation method based on the phase change material and solar photo-thermal. The solution temperature is increased through the photothermal effect, meanwhile, the phase change material is used for storing heat and releasing heat in the absence of solar radiation so as to maintain the high-temperature environment, then the directional migration rate of positive ions is maintained, heat storage and heat release can be conducted repeatedly, and therefore low-cost and continuous electric energy output gain is achieved.

Description

technical field [0001] The disclosure belongs to the technical field of power generation, and in particular relates to a salinity cycle power generation system and method based on phase change materials and solar photothermal. Background technique [0002] Solar energy is a clean and cheap renewable energy with the advantages of wide distribution, high energy density, and large storage capacity. Its utilization methods mainly include: photothermal conversion, photoelectric conversion and photochemical conversion. Near the ocean, solar-to-thermal conversion is widely used in seawater desalination and other fields. The chemical potential difference between seawater and freshwater contains huge energy. The way of using seawater and freshwater to generate electricity is called "blue energy". It forms a closed loop with the external circuit, and the salt difference can be converted into electrical energy. Due to the characteristics of large latent heat, good temperature uniform...

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Problems solved by technology

However, regardless of the one-dimensional, two-dimensional or three-dimensional structure, although various ion-selective membranes can increase the power density of the electroosmotic power generation system, they also greatly increase the system cost and have problems such as service life, which is not conducive to engineering. application

At the same time, all kinds of power generation devices and systems that use solar energy efficiency to generate electricity due to salt difference will not be able to continuously increase efficiency in dark or rainy conditions due to the intermittent and unstable sunlight.

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