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Preparation method of phase-change energy-storage material

A technology of phase-change energy storage materials and phase-change substances, which is applied in the field of working systems for indirectly heating crude oil, can solve the problems of increased damage, little improvement in adsorption rate, and influence of the life cycle of energy storage materials, and can achieve a wide range of sources. , the effect of solving environmental problems

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfuric acid is a strong acid, which will inevitably cause damage to the skeleton structure of the inorganic carrier while expanding the pores, and the degree of damage will increase with the increase of the acid concentration.
The method introduced in the literature uses 70% (mass fraction) sulfuric acid solution to modify diatomite. High-concentration sulfuric acid solution will cause a large change in the diatomite skeleton structure, which will affect the service life of the prepared energy storage material.
In addition, even after modification with sulfuric acid solution of this concentration, the adsorption rate of paraffin is still only 65%, that is, the adsorption rate is not greatly improved.

Method used

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  • Preparation method of phase-change energy-storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The fly ash was impregnated with 70% citric acid aqueous solution, filtered and dried at 80°C for 10 hours to obtain modified fly ash; the ratio of citric acid aqueous solution to fly ash was 5:1. Weigh 100 parts (parts by mass) of modified fly ash into a beaker, add absolute ethanol as a dispersant at a volume ratio of 1:5, disperse on a magnetic stirrer for 30 min at a speed of 600 rpm, and obtain Dispersion I. Weigh 10 parts of paraffin wax with a phase transition temperature of 80 °C and 8 parts of carbon fiber into a beaker, add absolute ethanol at a volume ratio of 1:3, and stir on a magnetic stirrer for 60 min to form dispersion II at a speed of 600 rpm. point. Put the dispersion II into the dispersion I, control the temperature in a constant temperature electric heating mantle at 100°C, stir for 3 h (the absolute ethanol has been volatilized), and rotate at 1000 rpm, dry the product at 50°C for 10 h, crush and grind, that is Phase change energy storage materia...

Embodiment 2

[0036] In Example 1, the fly ash was impregnated with an aqueous citric acid solution with a mass concentration of 30%, and the other materials and operating conditions were kept unchanged to obtain a phase change energy storage material D. After analysis, the adsorption rate of fly ash modified by citric acid solution reached 42wt%, that is, with the decrease of the mass concentration of citric acid aqueous solution, the effect of pore expansion and volume expansion of fly ash carrier also decreased, and the adsorption capacity of paraffin decreased.

Embodiment 3

[0038] In Example 1, the number of parts of paraffin wax was increased to 40 parts, and the other materials and operating conditions were kept unchanged to obtain phase change energy storage material E. DSC detection found that the phase change latent heat value of E material was 153kJ / kg. That is, as the number of paraffin wax increases, the latent heat value of the phase change energy storage material increases.

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Abstract

The invention discloses a preparation method of a phase-change energy-storage material. The preparation method comprises the following steps: modifying fly ash with an organic acid, and then preparing the phase-change energy-storage material from the organic acid modified fly ash, a phase-change substance, and a heat-conductive performance modifier. The preparation method takes cheap fly ash as the raw material, then uses an organic acid to modify the fly ash so as to enlarge the pore volume of the fly ash, at the same time the carrier frame is not damaged; furthermore, part of the organic acid will be embedded into the frame mainly made of fly ash to strengthen the frame, so the phase-change substance absorption rate of an energy-storage material made of the modified fly ash can reach 65% or more, and the usage period is prominently prolonged.

Description

technical field [0001] The invention relates to a preparation method of a phase-change energy storage material. The phase-change energy storage material prepared by the method is particularly suitable for a working system that utilizes solar radiation heat to indirectly heat crude oil. Background technique [0002] Today, when traditional energy sources (such as coal, oil, natural gas, etc.) are increasingly tense, renewable energy sources (such as solar energy, wind energy, biomass energy, etc.) have made great progress as alternative energy sources. In areas with abundant sunshine, solar energy utilization has a good development prospect. In the transportation of high pour point crude oil, the heating of the oil consumes a lot of energy. If solar energy is used to heat crude oil, the consumption of non-renewable energy can be greatly reduced, which is of great significance in energy saving and environmental protection. [0003] In order to make better use of solar energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 赵亮方向晨王刚徐宏孙剑锋
Owner CHINA PETROLEUM & CHEM CORP
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