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Method and device for efficient photo-thermal water evaporation

An evaporation device and hot water technology, applied in the field of water evaporation, can solve the problem of high heating water, and achieve the effect of high-efficiency sewage concentration and low-cost

Pending Publication Date: 2020-03-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amount of water heated to the surface layer is still relatively high compared to photothermal materials.

Method used

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  • Method and device for efficient photo-thermal water evaporation
  • Method and device for efficient photo-thermal water evaporation
  • Method and device for efficient photo-thermal water evaporation

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Multi-strand cotton threads are folded together to form a water transmission channel, a water-absorbing sponge with a diameter of 3 cm is used as a water-rich layer (thickness 5 mm), and a fast filter paper with a diameter of about 3 cm is used as a water-poor layer (thickness 100 μm). Dopamine (thickness 100 μm) is used as a photothermal material to construct an efficient water evaporation device. First, the polydopamine pellets are deposited on the filter paper by filtration, and then adsorbed on the absorbent sponge, and the filter paper is wetted with water to make it well adsorbed on the sponge; a hole (diameter 5mm) is punched in the center of the sponge, and the cotton thread Pass through the hole to form a photothermal device. The device is placed on the center open cell foam. The foam has a diameter of 5 cm or more and floats on the water in the beaker. The device with the cotton thread is placed over the foam, and the thread enters the water through the open...

Embodiment 2

[0026] Using suede as the water transmission channel and water-rich layer, cotton cloth as the water-poor layer and graphene oxide as the photothermal material layer to construct a large-area photothermal water evaporation device. Cut the cotton cloth into a circle with a diameter of 15 cm, and deposit graphene oxide on the surface of the cotton cloth through filtration, then sew the cotton cloth and suede with a diameter of 15 cm, and punch 4 pieces at equal intervals on it Holes, cut strips of faux suede through the four holes as water transfer channels. Place a circular foam with 4 openings on a water surface with a diameter of 20 cm and place the above-mentioned photothermal device on the foam, place the device under sunlight, and soon you can see water droplets on the top of the device produce (such as Figure 4 shown).

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Abstract

The invention discloses a method and a device for efficient photo-thermal water evaporation, belonging to the technical field of water evaporation. The device comprises a water conveying channel, a floating / heat insulation layer, a water-rich porous material layer, a water-poor porous material layer and a photo-thermal conversion material layer, wherein the floating / heat insulation layer floats the whole device on a water surface, connects a water body with the device through the strong water absorption characteristic of the water conveying channel and provides enough water for the device; thewater-rich porous material layer adopts a porous material layer with strong water absorption, so water can be dispersed into the water-rich layer from the water conveying channel and expanded to thewhole device; the water-poor porous material layer is a relatively weak water-absorbing material; and the photo-thermal conversion material layer is a material with high photo-thermal conversion capability. Water is subjected to one-step rapid water conveying and water dispersion through the water conveying channel and the water-rich porous material layer; then the amount of water in contact withthe photo-thermal material is further reduced through the water-poor layer; and finally, a trace amount of water can be locally and efficiently heated on the photo-thermal material, and a water evaporation rate is increased.

Description

technical field [0001] The invention relates to the technical field of water evaporation, in particular to a method and device for high-efficiency water evaporation. Background technique [0002] Using solar energy to evaporate water through photothermal materials is a sustainable, green and environmentally friendly method to achieve seawater desalination, heavy metal sewage treatment, and waste liquid concentration. Today, with increasing emphasis on environmental protection and energy shortages, how to make full use of solar energy has received extensive attention. [0003] Traditional water evaporation uses direct heating until the water boils, which requires the entire water to be heated above the boiling point, thus consuming a large amount of fossil energy. The evaporation of water in nature is to use sunlight to directly irradiate the water surface, and the evaporation rate is low due to the weak absorption of light by water. In recent years, with the research and d...

Claims

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Application Information

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IPC IPC(8): B01D1/30B01D1/00C02F1/14C02F103/08
CPCB01D1/0035B01D1/30C02F1/043C02F1/14C02F2103/08Y02A20/212
Inventor 孙再成孙瑜堃曲丹
Owner BEIJING UNIV OF TECH
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