Biochar-paraffin phase change heat storage material and preparation method thereof

A phase change heat storage material, biochar technology, applied in heat exchange materials, chemical instruments and methods, sustainable manufacturing/processing, etc. Surface activity and the effect of improving comprehensive mechanical properties

Inactive Publication Date: 2020-06-05
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional paraffin phase change heat storage materials often need to add high thermal conductivity materials (such as: copper powder, aluminum powder, etc.) to reduce the therma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this example, the biochar-paraffin phase change heat storage material and its preparation method are as follows:

[0023] (1) Shred the recycled waste crop stalks to a particle size of 3mm.

[0024] (2) Heat the shredded straw to 800°C at a rate of 2°C / min in a tube furnace filled with nitrogen, and keep it warm for 2 hours to crack the straw into biochar materials, and then place the biochar materials at 500°C Surface oxidation treatment was carried out in a hot air atmosphere for 10 minutes.

[0025] (3) Put 85g of paraffin block with a melting point of 60°C into the cavity of the mold, weigh 15g of biochar and add it into the cavity, then heat the mold to 80°C and stir thoroughly to melt the paraffin block in the cavity It is evenly mixed with the biochar material, cooled and solidified naturally to obtain a phase change heat storage material.

[0026] The heat storage material has high phase change latent heat, good thermal conductivity, stable heat storage per...

Embodiment 2

[0028] In this example, the biochar-paraffin phase change heat storage material and its preparation method are as follows:

[0029] (1) Shred the recycled waste crop stalks to a particle size of 5 mm.

[0030] (2) Heat the shredded straw to 820°C at a rate of 3°C / min in a tube furnace filled with nitrogen, and keep it warm for 1 hour to crack the straw into biochar materials, and then place the biochar materials at 600°C Surface oxidation treatment was carried out for 8 minutes in a hot air atmosphere.

[0031] (3) Put 88g of paraffin block with a melting point of 60°C into the cavity of the mold, weigh 12g of biochar, then heat the mold to 85°C, and stir thoroughly to melt the paraffin block in the cavity and mix with the biochar. The carbon materials are evenly mixed, cooled and solidified naturally to obtain a phase change heat storage material.

[0032] The heat storage material has high phase change latent heat, good thermal conductivity, stable heat storage performance...

Embodiment 3

[0034] In this example, the biochar-paraffin phase change heat storage material and its preparation method are as follows:

[0035] (1) Shred the recycled waste crop stalks to a particle size of 1 mm.

[0036] (2) Heat the shredded straw to 780°C at a rate of 1°C / min in a tube furnace filled with nitrogen, and keep it warm for 3 hours to crack the straw into biochar materials, and then place the biochar materials at 400°C Surface oxidation treatment was carried out for 12 minutes in a hot air atmosphere.

[0037] (3) Put 82g of paraffin block with a melting point of 60°C into the cavity of the mold, weigh 18g of biochar, then heat the mold to 75°C and stir thoroughly to melt the paraffin block in the cavity and mix with the biochar. The carbon materials are evenly mixed, cooled and solidified naturally to obtain a phase change heat storage material.

[0038] The heat storage material has high phase change latent heat, good thermal conductivity, stable heat storage performanc...

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PUM

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Abstract

The invention relates to the field of phase change heat storage materials, in particular to a biochar-paraffin phase change heat storage material and a preparation method. The cut straw is heated to 800 DEG C +/- 20 DEG C in a tubular furnace filled with nitrogen at the speed of 1-3 DEG C/min and heat preservation is conducted for 1-3 h, so that the straw is cracked into a biochar material; and then the biochar material is placed in the hot air atmosphere of 400-600 DEG C to be subjected to surface oxidation treatment for 8-12 min; and the paraffin block is placed into a mold cavity of a moldwith addition of the biochar material subjected to surface oxidation, then the mold is heated to 70-90 DEG C with complete stirring to melt the paraffin block in the mold cavity, then the paraffin isuniformly mixed with the biochar material, and the product is naturally cooled and cured to obtain the phase change heat storage material. The biochar accounts for 10-20% by mass, and the paraffin accounts for 80-90% by mass. According to the biochar-paraffin phase change heat storage material, the heat transfer efficiency of the material is effectively improved, the volume change of the materialin the phase change process is stabilized, and the manufacturing cost of the material is reduced.

Description

technical field [0001] The invention relates to the field of phase-change heat storage materials, in particular to a biochar-paraffin phase-change heat storage material and a preparation method thereof. Background technique [0002] As a large agricultural country, our country always has a large amount of crop stalks such as wheat, corn, and rice discarded every year during summer harvest and autumn and winter. These discarded crop stalks are burned in the field, which produces a lot of smoke, which not only becomes the bottleneck of rural environmental protection, but even becomes the chief culprit of the urban environment. Crop straw is a very valuable biomass energy resource in the agricultural ecosystem. The utilization of crop resources is of great significance to promote environmental protection, resource conservation and sustainable development of agricultural economy. [0003] At the same time, due to the shortage of non-renewable energy such as coal and oil, the d...

Claims

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Application Information

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IPC IPC(8): C09K5/06C09K5/14
CPCC09K5/063C09K5/14Y02P20/10
Inventor 彭涛王海旺熊昕宇霍原非傅渭杰侯安然黄谦刘可凡
Owner 东北大学秦皇岛分校
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