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Method for preparing porous charcoal pieces capable of realizing efficient photo-thermal steam converting

A photothermal conversion and charcoal technology, applied in the field of solar material preparation, can solve the problems of difficult large-scale survival, expensive precious metals, etc., and achieve the effects of low cost, simple operation and good adhesion

Active Publication Date: 2017-12-19
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The price of precious metals is difficult to achieve large-scale survival due to its high price

Method used

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  • Method for preparing porous charcoal pieces capable of realizing efficient photo-thermal steam converting
  • Method for preparing porous charcoal pieces capable of realizing efficient photo-thermal steam converting
  • Method for preparing porous charcoal pieces capable of realizing efficient photo-thermal steam converting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Divide 3×3×1cm 3 Put the wooden blocks into a blast drying oven and dry at 60°C for 24 hours; then put them in a quartz vacuum tube under the protection of nitrogen atmosphere and keep them warm at 300°C for 2 hours, and then pyrolysis and carbonization at high temperature to obtain carbonized whole charcoal; the heating rate of the quartz vacuum tube is 5 °C / min;

[0030] 2) Utilize a diamond cutter to cut the carbonized monolithic charcoal obtained in step 1) along the direction vertical to the charcoal channel to obtain a charcoal sheet with a thickness of 3 mm;

[0031] 3) The charcoal sheet prepared in step 2) is ultrasonically cleaned with deionized water, and dried in a blast drying oven at 60-100° C. to obtain a porous charcoal sheet.

[0032] The prepared charcoal sheet has regular and vertical large pores, and the size of the pores is 35 × 35 μm (such as figure 1 ), the light absorption rate in the range of 250 ~ 2500nm is 96.70% (such as figure 2 shown...

Embodiment 2

[0034] 1) Divide 3×3×1cm 3 Put the wooden blocks into the blast drying oven and dry at 60°C for 24h; then put them into the quartz vacuum tube under the protection of nitrogen atmosphere, keep the temperature at 500°C for 2h, high-temperature pyrolysis and carbonization, and obtain carbonized whole piece of charcoal; the heating rate of the quartz vacuum tube 2°C / min;

[0035] 2) using a diamond cutter to cut the carbonized monolithic charcoal obtained in step 1) along the vertical direction of the charcoal channel to obtain a charcoal sheet with a thickness of 1 mm;

[0036] 3) The charcoal sheet prepared in step 2) is ultrasonically cleaned with deionized water, and dried in a blast drying oven at 60-100° C. to obtain a porous charcoal sheet.

[0037] Such as figure 1 As shown, the prepared charcoal sheet has regular and vertical large pores, and the size of the pores is 20 × 30 μm (such as image 3 ), the light absorption rate in the range of 250-2500nm is 97.9% (such as...

Embodiment 3

[0039] 1) Divide 3×3×1cm 3 Put the wooden blocks into a blast drying oven and dry at 100°C for 24 hours; then put them into a quartz vacuum tube under the protection of nitrogen atmosphere, keep them warm at 900°C for 2 hours, and pyrolyze and carbonize at a high temperature to obtain a carbonized whole block of charcoal; the quartz vacuum tube is heated The rate is 2°C / min;

[0040] 2) using a diamond cutter to cut the carbonized monolithic charcoal obtained in step 1) along the vertical direction of the charcoal channel to obtain a charcoal sheet with a thickness of 1 mm;

[0041] 3) The charcoal sheet prepared in step 2) is ultrasonically cleaned with deionized water, and dried in a blast oven at 60-100° C. to obtain a porous charcoal sheet.

[0042] The prepared charcoal sheet has regular and vertical large pores, and the size of the pores is 20 × 20 μm (such as Figure 5 ), the light absorption rate in the range of 250 ~ 2500nm is 97.7% (such as Image 6 ).

[0043] T...

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Abstract

The invention discloses a method for preparing porous charcoal pieces capable of realizing efficient photo-thermal steam converting. The method comprises the following steps: 1) drying wood block; placing the wood block in a quartz tubular furnace, under nitrogen atmosphere protection, performing high temperature pyrolysis at the temperature of 300-900 DEG C and carbonization to obtain the whole block of carbonized charcoal; 2) cutting the carbonized charcoal obtained in the step 1) along a vertical charcoal tunnel direction or polishing the carbonized charcoal to obtain the charcoal pieces with thickness being 1-3 mm; and 3) using deionized water to performing ultrasonic cleaning on the charcoal pieces obtained in the step 2), and drying the material to obtain the porous charcoal pieces. The obtained charcoal pieces have regular tunnels, are beneficial for steam flowing, have good adhesiveness with water, and can guarantee for transferring the heat to water. The charcoal pieces have light absorptivity being more than 95% in a 250-2500 nm scope, and under light intensity of 1 kW.m<-2>, the photo-thermal steam efficiency can reach as high 91.2%. The porous charcoal pieces have the advantages of low cost, simple operation, and environmental protection, and can be used for sewage processing and seawater desalination.

Description

Technical field: [0001] The invention relates to the technical field of solar energy material preparation, in particular to a method for preparing a porous charcoal sheet that realizes high-efficiency light-to-heat steam conversion. Background technique: [0002] Solar energy is the most important basic energy among all kinds of renewable energy. Because of its inexhaustible, inexhaustible, green and environmental protection advantages, it has become the most concerned technology in the field of new energy applications. With the continuous development of science and technology, solar energy technology has been applied to various aspects of scientific research, aerospace, national defense construction and human daily life, and has become one of the core contents of the global sustainable development strategy. [0003] Among solar energy utilization technologies, solar photothermal conversion can directly convert light energy into heat energy, and has the highest conversion ef...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F1/14C01B32/05C02F103/08
CPCC02F1/04C02F1/043C02F1/14C02F2103/08Y02A20/124Y02A20/142Y02A20/212Y02W10/37
Inventor 苗蕾刘朋飞邓梓阳周建华苏珲
Owner GUILIN UNIV OF ELECTRONIC TECH
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