Photothermal conversion device based on hydrophilic carbon felt and application thereof

Abstract

The invention relates to the technical field of photothermal conversion, and aims to provide a photothermal conversion device based on hydrophilic carbon felt and application thereof. The photothermalconversion device comprises top absorbing bodies, middle water conveying bodies, and a bottom thermal insulation support body capable of floating on the surface of liquid; multiple vertical hole waysare formed in the thermal insulation support body at intervals; the water conveying bodies are inserted in the hole ways; the two ends of the water conveying bodies extend out of the upper and lowersurfaces of the thermal insulation support body, and the upper sections are directly exposed in air; and the top absorbing bodies are the flaky hydrophilic carbon felt, and are naturally placed at thetops of the water conveying bodies to realize supporting. The thermal insulation support body is higher in heat resistance, so that the downward transfer of heat absorbed by the top absorbing bodiesfrom sunlight is prevented, and the heat efficiency of the whole device is higher. The micro-nano hole ways at the upper sections of the water conveying bodies make direct contact with an air interface to achieve a higher saturated vapor pressure; water can cool the whole device during volatilizing; and the heat can be obtained from the environment to be nearer the thermodynamics evaporation limit.

Description

technical field [0001] The invention relates to the field of photothermal conversion, in particular to a photothermal conversion device based on hydrophilic carbon felt and its application. Background technique [0002] With the gradual shortage of fresh water resources and the increasingly serious water pollution, efficient, low-toxic, cheap, and environmentally friendly water treatment technologies are particularly critical. Solar water evaporation technology is favored by many scholars for its advantages of low energy consumption, no secondary pollution, and high purity of fresh water. However, traditional solar water evaporators generally rely on complex and huge light concentrating or light tracking devices. These devices are greatly affected by the weather, difficult to maintain in the later stage, high in cost, and large in heat loss, which is not conducive to large-scale industrialization. application. [0003] In order to improve the evaporation performance of the...

AI Technical Summary

Problems solved by technology

However, the main obstacles to the application of this device are: (1) the lack of effective light-to-heat conversion materials as the top absorber

The reported photothermal conversion materials such as carbon nanotubes, graphene, semiconductor sulfides, noble metal materials, etc., have major problems in current research and future applications, such as complex preparation process, high cost, certain toxicity

And the temperature of the absorber is high under the light, but the ambient temperature is low, so the device still has a large convection loss and radiation loss, and in the case of long-term operation, the heat on the surface of the absorber will still be transferred to the water , which causes a certain heat conduction loss

(2) The water transmission channel of the solar water evaporator is located inside the heat insulating support, resulting in poor evaporation effect

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