Method for boosting crystallization of phase-change cold-storing material of eutectic salt solution

A cold storage material and phase change cold storage technology, applied in the direction of solution crystallization, heat exchange materials, chemical instruments and methods, etc., can solve the problems of affecting cold storage efficiency, reducing the working efficiency of refrigeration units, energy waste, etc., and achieve the elimination of nucleation The effect of supercooling

Inactive Publication Date: 2012-07-04
SOUTH CHINA UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

[0002]In recent years, with the rapid growth of my country's economic development, the problem of energy shortage has become more and more serious. This results in a huge waste of energy
Phase-change cold storage is an effective means to realize peak-shifting and valley-filling of power grids. The temperature of industrial cold storage is generally below 0°C. Under the current technical conditions, industrial cold storage has the following problems: First, the comparison of nucleation supercooling degree during phase-change cold storage Larger, so that the eva

Method used

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  • Method for boosting crystallization of phase-change cold-storing material of eutectic salt solution

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Embodiment 1

[0021] Nano Fe 3 o 4 Particle plus magnetic field promotes BaCl 2 Aqueous solution crystallization, the volume fraction is 1.2% Fe 3 o 4 Nanoparticles and 100 parts of BaCl with a mass concentration of 26.4% 2 Aqueous solution mixing, in order to make Fe 3 o 4 Nanoparticles are uniformly suspended in BaCl 2 In the aqueous solution, a composite dispersant of sodium tripolyphosphate and triethanolamine is selected, the volume fraction of the dispersant is 0.6%, and then ultrasonic vibration is carried out for 30 minutes to obtain a suspended and stable Fe 3 o 4 -BaCl 2 -H 2 O cold storage material, the magnetic field strength during crystallization is 550Gauss, its nucleation supercooling degree is reduced by 94.2%, and the crystallization time is shortened by 75.2%.

Embodiment 2

[0023] Nano Fe 3 o 4 Adding a magnetic field to the particles promotes the crystallization of KCl aqueous solution, and the volume fraction of 0.1% Fe 3 o 4 The nanoparticles were mixed with 100 parts of KCl aqueous solution with a mass concentration of 25.5%, in order to make Fe 3 o 4 Nanoparticles are uniformly suspended in KCl aqueous solution, a composite dispersant of sodium tripolyphosphate and triethanolamine is selected, the volume fraction of the dispersant is 0.36%, and then ultrasonic vibration is carried out for 40 minutes to obtain a suspended and stable Fe 3 o 4 -KCl-H 2 O cold storage material, the magnetic field strength during crystallization is 600Gauss, its nucleation supercooling degree is reduced by 35.4%, and the crystallization time is shortened by 28.5%.

Embodiment 3

[0025] Nano Co 2 o 3 Adding a magnetic field to the particles promotes the crystallization of KCl aqueous solution, and the volume fraction of 0.5% Co 2 o 3 Nanoparticles were mixed with 100 parts of KCl aqueous solution with a mass concentration of 25.5%, in order to make Co 2 o 3 Nanoparticles are uniformly suspended in KCl aqueous solution, a composite dispersant of sodium tripolyphosphate and triethanolamine is selected, the volume fraction of the dispersant is 0.45%, and then ultrasonic vibration is performed for 30 minutes to obtain a stable suspension of Co 2 o 3 -KCl-H 2 O cold storage material, the magnetic field strength during crystallization is 650Gauss, its nucleation supercooling degree is reduced by 57.3%, and the crystallization time is shortened by 52.4%.

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Abstract

The invention discloses a method for boosting crystallization of a phase-change cold-storing material of a eutectic salt solution. The method comprises the following steps: mixing 100 parts of eutectic salt solution with a mass concentration of 10-26.4% with 0.1-1.2 parts of magnetic metal nanometer particles or magnetic metal oxide nanometer particles, and then adding 0.2-0.6 parts of surface dispersing agent, and ultrasonically treating for more than 30 minutes, thereby obtaining a suspended low-temperature phase-change cold-storing material of the eutectic salt solution. An electromagnetic coil is uniformly wound on an outer wall around a cold-storing tank; a direct current is introduced; the direction of a generated magnetic field is opposite to the direction of gravity; and the strength of the magnetic field is adjusted by changing the size of a voltage. According to the method provided by the invention, the magnetic nanometer particles and the magnetic field effect are utilized to strengthen the heat-transfer characteristic of the traditional cold-storing material of the eutectic salt solution, the nucleating condensate depression is improved, the crystallizing time is shortened, the cold-storing efficiency is increased, and meanwhile, the volume of a heat exchanger is reduced.

Description

technical field [0001] The invention relates to the field of eutectic brine solution phase change cold storage, in particular to a method for promoting the crystallization of eutectic brine solution phase change cold storage materials. Background technique [0002] In recent years, with the rapid growth of my country's economic development, the problem of energy shortage has become increasingly serious, the load of the power grid is too heavy, and the contradiction between peak and valley load differences has become more prominent, resulting in huge energy waste. Phase-change cold storage is an effective means to realize peak-shifting and valley-filling of power grids. The temperature of industrial cold storage is generally below 0°C. Under the current technical conditions, industrial cold storage has the following problems: First, the comparison of nucleation supercooling degree during phase-change cold storage Larger, so that the evaporation temperature of the refrigeratio...

Claims

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Application Information

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IPC IPC(8): B01D9/02B01J19/12C09K5/06
CPCY02E60/147Y02E60/14
Inventor 汪双凤何钦波饶中浩罗婉霞
Owner SOUTH CHINA UNIV OF TECH
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