Photo-thermal interface evaporation structure and method based on capillary fiber woven water supply

Abstract

The invention relates to a photo-thermal interface evaporation structure based on capillary fiber woven water supply. The photo-thermal interface evaporation structure comprises a water source, a thermal insulation material, a capillary fiber network, a photo-thermal conversion material and a light source. The thermal insulation material is fixed or floated above the water source, capillary fiberspenetrate through the thermal insulation material to be woven into the capillary fiber network, the lower end of the capillary fiber network makes contact with the water source, the upper end of thecapillary fiber network makes contact with the photo-thermal conversion material, and the light source is arranged above the photo-thermal conversion material. Liquid in the water source enters an evaporation interface of the photo-thermal conversion material through the capillary fiber network and is evaporated under the irradiation of the light source. The photo-thermal interface evaporation structure has the beneficial effects that the capillary fibers are embedded into the thermal insulation material in a weaving manner, three-dimensional capillary water guide networks are formed above andbelow the thermal insulation material to supply water to the photo-thermal conversion material, and meanwhile, good water drawing and thermal insulation effects are achieved, efficient photo-thermalinterface evaporation is achieved, and higher solar utilization efficiency is obtained.

Description

technical field [0001] The invention relates to the fields of seawater desalination and photothermal evaporation, in particular to a photothermal interface evaporation structure and method for water supply based on capillary fiber weaving. Background technique [0002] The thermal technology of solar seawater desalination mainly uses the light and heat resources of solar energy to heat seawater to undergo a phase change and evaporate, and then collect fresh water through condensation. Photo-thermal solar seawater desalination technology has the advantages of high efficiency, low cost and simple maintenance, and is currently the mainstream solar seawater desalination technology. In traditional multi-stage evaporation and other thermal seawater desalination or solar stills, the heat-absorbing medium includes seawater and the substrate, which not only heats the evaporated water, but also heats the concentrated water that is finally discharged. Although in large-scale seawater ...

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Problems solved by technology

However, this technology also needs to comprehensively balance the relationship between water supply and heat loss: if the area of ​​the water conduction channel is too small, or the water conduction efficiency is not high, although the heat leakage loss of the photothermal material can be reduced, this will not only make the water supply at the evaporation interface Insufficient, reduce the photo-thermal evaporation efficiency, but also lead to serious "salt accumulation" phenomenon, reduce the light-receiving area, thereby further reducing the photo-thermal evaporation efficiency

The existing technologies all use fiber cloth such as cotton cloth and gauze as the water absorption unit, which has disadvantages such as low water drawing efficiency, high heat loss rate, and uncontrollable adjustment of the water absorption channel area.

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