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Solar steam generation system can use solar energy to locally heat water to generate steam, which has great application potential in the fields of seawater desalination and sewage treatment. The solar steam generation system mainly includes two parts: the light absorption system and the thermal localization system. As the high-efficiency solar photo-thermal steam conversion under low concentration can be realized, the solar photo-thermal steam conversion device has the advantages of simple structure, low cost, Solar steam generation system has been widely concerned because of its high efficiency and easy application. In recent years, more and more thermally localized solar steam generation systems have been proposed. However, the light-heat-steam conversion efficiency of such systems is still less than 100% due to energy loss and manufacturing constraints. For efficiencies approaching or even greater than 100%, Systematic theoretical exploration is still relatively scarce, and there is still great potential to improve the efficiency of the system. This paper mainly focuses on the thermally localized solar steam generation system. On the basis of summarizing the previous work, the heat and mass transfer mechanism of the thermally localized solar steam generation system is first described, and then the dependence of conversion efficiency on the system structure and external environment is analyzed from the perspective of energy conservation. Analyzed. The summary of the related mechanism and the results of energy analysis can provide a reference for the system structure optimization, material selection and environmental control. At present, there are still many problems in the large-scale application of solar steam generation system, including how to overcome the deposition of salt on the surface of the equipment and how to effectively collect the steam. Finally, thermally localized solar The future improvement direction of the steam generation system is prospected. |
