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Phase change heat storage biogas device for increasing solar energy utilization rate

A phase change heat storage and biogas device technology, applied in solar thermal devices, solar thermal energy, solar thermal power generation, etc., can solve the problems of reduced biogas production, affecting people's use, insufficient fermentation, etc., to improve the crystallization effect and increase production. The effect of gas continuity and improving light absorption efficiency

Pending Publication Date: 2016-12-07
XIAMEN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Feces and other materials are put into biogas digesters or biogas tanks for fermentation to produce biogas, which are transported through pipelines for human use. However, biogas digesters or biogas tanks are easily affected by the external temperature, especially in winter, when the temperature is low, the internal fermentation is not sufficient , especially in the north, the surface of biogas digesters or biogas tanks often freezes, and the production of biogas is greatly reduced, which will affect people's use

Method used

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  • Phase change heat storage biogas device for increasing solar energy utilization rate
  • Phase change heat storage biogas device for increasing solar energy utilization rate
  • Phase change heat storage biogas device for increasing solar energy utilization rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: The phase change material is disodium hydrogen phosphate dodecahydrate, such as Figure 4 As shown, the comparison of phase change materials with and without dye added after one day of sunlight exposure, both test tubes were filled with disodium hydrogen phosphate dodecahydrate, and the right test tube was added with dye (concentration of 0.001 g / mL). It can be seen that the material in the test tube on the left is almost not melted, that is, the absorbed light energy is too little and there is not enough heat; while the material in the test tube on the right is almost completely melted, it can be seen that the addition of dyes can make full use of solar energy and greatly improve the The light absorption efficiency of the material, and the dye has a certain viscosity, which can alleviate the phase separation to a certain extent and improve the crystallization effect.

[0042] In addition, an ultraviolet-visible spectrophotometer is used to measure the ph...

Embodiment 2

[0045] Embodiment 2: The phase change material is zinc nitrate hexahydrate

[0046] After the zinc nitrate hexahydrate added with the dye is exposed to the sun for 4 hours, the initial temperature of the phase change material at the time of measurement is 29.4°C, which may be slightly lower due to the second set of measurements. from Figure 8 It can be seen from the step-cooling curve above that the phase change material does not start to heat up until the temperature drops to 26.8°C during the cooling process, and the temperature rises from 26.8°C to 30.7°C. The theoretical phase transition temperature of zinc nitrate hexahydrate is calculated at 36.4°C, and the supercooling degree of the overall material after adding the dye is 9.6°C. By comparing with the previously measured step-cooling curve of zinc nitrate hexahydrate, it can be considered that adding 5% The dye can slightly reduce the undercooling of zinc nitrate hexahydrate, about 3-4 ℃ undercooling. In addition, th...

Embodiment 3

[0047] Example 3: The phase change material is calcium chloride hexahydrate, adding 5% water and mixing it with dye

[0048] Similar to the previous measurement of the step cooling curve of the mixture of calcium chloride hexahydrate and hydrate, the phase transition temperature and other properties of calcium chloride hexahydrate were improved by adding 5% water.

[0049] Calcium chloride hexahydrate added with dye fully absorbs light energy after being exposed to the sun for 4 hours. The initial temperature of the phase change material during measurement is 32.2° C., and the phase change material is completely melted. from Figure 10 From the step-cooling curve above, it can be seen that the temperature rise process occurs when the temperature of the phase change material drops to 26.8°C during the cooling process, and the temperature of the phase change material decreases slowly after exothermic heating from 26.8°C to 30.1°C. Figure 11 It is the crystallization state of ...

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Abstract

The invention discloses a phase change heat storage biogas device for increasing the solar energy utilization rate. The phase change heat storage biogas device comprises a biogas tank, a phase change material, dyestuff, an antireflection film and a heat preservation quilt. The outer wall of the biogas tank is covered with the phase change material, the dyestuff is mixed in the phase change material, the outer side of the phase change material is evenly wrapped by the antireflection film, and when heat needs to be released after the phase change material absorbs heat, the outer side of the antireflection film is covered with the heat preservation quilt. A proper temperature environment can be provided for microbial fermentation in the biogas tank, biogas generating continuity is improved, the biogas yield is increased, the process is simple, and operation is easy.

Description

technical field [0001] The invention relates to the field of biogas devices, in particular to a phase-change thermal storage biogas device for improving solar energy utilization. Background technique [0002] Biogas is a combustible gas produced by microbial fermentation of organic matter in an anaerobic environment under certain conditions of temperature, humidity, and pH. Biogas can be used as a living fuel. With the continuous development of my country's economy, the use of biogas technology is also being popularized and developed. More and more people start to use biogas digesters or biogas tanks. Feces and other materials are put into biogas digesters or biogas tanks for fermentation to produce biogas, which are transported through pipelines for human use. However, biogas digesters or biogas tanks are easily affected by the external temperature, especially in winter, when the temperature is low, the internal fermentation is not sufficient , especially in the north, the...

Claims

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Application Information

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IPC IPC(8): C12M1/107F24J2/04
CPCC12M21/04C12M31/02F24S10/00Y02E10/44Y02E50/30
Inventor 王蕾许欢李金恒钟高镇李刚胡春荣孟维国刘明静赵象俊田霞李延龙
Owner XIAMEN UNIV OF TECH
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