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Biomass composite heat storage material and preparation method thereof

A technology of biomass materials and heat storage materials, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of rare and expensive metal substrates, complicated preparation processes, waste of resources and the environment, and achieve low cost and simple preparation methods , The effect of energy saving and environmental protection waste resources

Inactive Publication Date: 2020-02-14
SICHUAN TIANFA TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of adding metal materials, fins, graphite and other measures is complicated, and the corresponding cost is relatively high, and some metal substrates are rare and expensive, and it is difficult to recycle after adding heat storage materials, resulting in waste of resources and environmental pollution.
[0005] Biomass materials are lumps of biomass waste as raw materials, which can be obtained in large quantities at low cost in my country. At present, the treatment of biomass waste is generally used in landfill composting, combustion and other fields, with low utilization efficiency and a large amount of open air Accumulated biomass materials can also pollute the environment
How to effectively solve the problems of resource waste and environmental pollution caused by paraffin and biomass materials has become a difficult problem for technicians to overcome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The high-performance phase-change thermal storage material produced by the present invention uses waste biomass materials and paraffin materials with a melting point of 60°C. The specific preparation method is as follows: preheat the muffle furnace to 150°C, weigh a certain quality of waste biomass materials and put The temperature was kept in a muffle furnace at 200° C. for 9 hours and then lowered to room temperature for dry storage. Put it into a recycling material crusher for circular crushing, and then pass through a 20-mesh sieve to obtain the preliminary crushed biomass coarse powder, put the preliminary crushed biomass coarse powder into a grinder for dry grinding for 1.5 hours, and then pass through a 400-mesh sieve to obtain the required fine biomass powder.

[0035] Take the biomass powder in the oxalic acid solution with a mass fraction of 8%, and use ultrasonic dispersion for 10 minutes to 30 minutes. Put it in an oven at 80°C, and heat it with hydrotherma...

Embodiment 2

[0039] Compared with Example 1, in this example, the weight ratio of carrier matrix to paraffin is different, the activation temperature is different, and the other preparation processes are the same, wherein the weight ratio of carrier matrix to paraffin is 5:2, and the activation temperature is 450°C.

[0040] Through experiments, the phase transition time of the obtained biomass composite thermal storage material is 47 minutes earlier than that of paraffin wax, the latent heat of phase transition is 174.3J / g, the phase transition temperature is 50°C, and its thermal conductivity is 27% higher than that of paraffin wax. %.

Embodiment 3

[0042] Compared with Example 1, in this example, the weight ratio of carrier matrix to paraffin is different, the activation temperature is different, and the other preparation processes are the same, wherein the weight ratio of carrier matrix to paraffin is 4:1, and the activation temperature is 550°C.

[0043] Through experiments, the phase transition time of the obtained biomass composite heat storage material is 43 minutes earlier than that of paraffin wax, the latent heat of phase transition is 170.3J / g, the phase transition temperature is 50°C, and its thermal conductivity is 26% higher than that of paraffin wax. %.

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Abstract

The invention provides a biomass composite heat storage material, which comprises a phase change material and a carrier matrix, wherein the phase change material is filled in the gaps of the carrier matrix, and is paraffin with a melting point of 55-65 DEG C, and the carrier matrix is a porous biomass carbon material obtained by pre-treating a biomass material. The preparation method of the heat storage material comprises: 1) heating, drying and crushing a biomass material to obtain biomass powder; 2) carrying out acid-alkali dissociation treatment on the biomass powder, drying, and carrying out heating activation to obtain a carrier matrix; and 3) mixing the carrier matrix and paraffin, filling the paraffin into the gaps of the carrier matrix through vacuum treatment, and cooling to obtain the composite heat storage material. According to the invention, the material can reduce environmental pollution caused by agricultural biological waste and achieve resource recycling, the preparation process is simple, and the cost is low.

Description

technical field [0001] The invention relates to the fields of new materials and energy regeneration and utilization, in particular to a method for preparing composite phase-change heat storage materials by utilizing biomass materials and paraffin wax. Background technique [0002] Facing the grim situation of tightening resource constraints and serious environmental pollution, the research on efficient and clean new energy utilization and the recycling of biological waste is particularly urgent. It is an important technical means for efficient utilization, resource conservation and environmental protection. Phase change material (PCM-Phase Change Material) is a heat storage technology commonly used in recent years. [0003] Phase change materials refer to substances that change the state of matter and provide latent heat under the condition of constant temperature. The process of changing physical properties is called a phase change process, and the phase change material w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 汪洋周俊虎刘树刚张永亮文光旭潘宏春
Owner SICHUAN TIANFA TECH
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