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Low-temperature phase transition material for storing cold energy and preparation method of low-temperature phase transition material

A low-temperature phase change and cold energy technology, which is applied in the field of composite materials, can solve problems such as poor cold storage capacity, high phase transition temperature of cold storage materials, and large fluctuations in cold energy supply, and achieve the effect of improving utilization

Inactive Publication Date: 2013-04-17
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Taking Shanghai as an example, the LNG gasification volume will reach a maximum of 1.04 million cubic meters per hour, while the minimum is only 8.5 cubic meters, with fluctuations of more than ten times, which has a great impact on the utilization of LNG. Taking advantage of the stable operation of the equipment, the scale of cold energy utilization can only be designed according to the minimum gasification capacity, resulting in a LNG utilization rate of only 15.1%.
[0007] After multiple experiments using the Chinese patented low-temperature phase change material for LNG cold energy storage and its preparation method (application number 200910048456.4), it was found that the cold storage material configured in case 4 had a higher phase change temperature and poor stability. like Figure 5 shown
The hexane of this invention embodiment has high toxicity and poor stability
[0008] In the preparation method of Chinese patented nanoporous graphite (patent number ZL200410052871.4), the composite cold storage material is unevenly distributed and has poor cold storage capacity
[0009] Therefore, it is necessary to solve the current problems of large fluctuations in cold energy supply to improve the utilization rate of LNG cold energy

Method used

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  • Low-temperature phase transition material for storing cold energy and preparation method of low-temperature phase transition material
  • Low-temperature phase transition material for storing cold energy and preparation method of low-temperature phase transition material
  • Low-temperature phase transition material for storing cold energy and preparation method of low-temperature phase transition material

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preparation example Construction

[0044] (1) Preparation of nanoporous graphite matrix: The nanoporous graphite matrix material is made of flake graphite, suitable oxidant and intercalation agent for intercalation reaction by thermochemical method, and then the nanoporous graphite material is prepared by microwave expansion method. The specific preparation The steps refer to the patented invention (preparation method of nanoporous graphite, patent number: ZL200410052871.4);

[0045] (2) Preparation method of low temperature phase change material for cold energy storage: nanoporous graphite matrix, TiO 2 Mix with the mixture in proportion (wt%) 2~5:98~95, and configure the solution through a high-temperature oil bath.

[0046] (3) Stir fully, mix evenly, let stand, cool to normal temperature, put into cryogenic test box, obtain the low-temperature phase-change material used for cold energy storage after completely solidifying.

[0047] Compositing of nanoporous graphite with nanometer metal matrix materials and ...

Embodiment 1

[0050] A method for preparing shallow-cooled nanoporous graphite and metal-based low-temperature phase-change materials: heptanol and ethyl bromide are selected as low-temperature phase-change materials.

[0051] Weigh 30 grams of heptanol and 6 grams of bromoethane into a 0.2L container, slowly add 1.5 grams of nanoporous graphite, 2.0 grams of TiO 2 , after fully absorbing, place the nanoporous graphite, titanium dioxide / heptanol, bromoethane phase change energy storage composite material in an ultrasonic oscillator at 150~160°C and stir for 10 minutes, and place it in an airtight container after it is mixed evenly. Put it in a cryogenic test box at -60°C, and after it is completely solidified, you can get a nanoporous and nanometal-based energy storage composite material for storing cold.

[0052] figure 1 It is the DSC figure of embodiment 1. The peak solidification phase transition temperature is -50.6 degrees, and the latent heat value of phase transition is 68.9~90J / ...

Embodiment 2

[0054] A method for preparing a nanometer metal-based low-temperature phase-change energy storage composite material: bromoethane and ethylene glycol are selected as low-temperature phase-change materials.

[0055] Weigh 13g of ethylene glycol and 7g of bromoethane into a 0.2L container, slowly add 0.5g of silicon dioxide, 0.2g of 80 Sipan, and after fully absorbed, phase change storage of secondary silica / bromoethane and ethylene glycol The energy composite material is placed in an ultra-deep wave oscillator at 150-160°C and stirred for 10 minutes. After it is mixed evenly, it is placed in a closed container and placed in a -60°C cryogenic test chamber. After being completely solidified, the nanometer metal matrix energy storage composite material for storing cold is obtained.

[0056] image 3 It is the DSC figure of embodiment 2. Its phase transition latent heat value is 70-83J / g, and its solidification phase transition temperature is -42 degrees. Figure 4 It is the col...

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Abstract

The invention discloses a low-temperature phase transition material for storing cold energy. The low-temperature phase transition material is characterized in that the low-temperature phase transition material comprises the following components in parts by weight: 0.2-5 parts of nano metal material, 0.2-5 parts of nano porous graphite substrate, 0.2-5 parts of surfactant, and 20-98 parts of low-temperature organic phase transition substance. The invention further discloses a preparation method of the low-temperature phase transition material. The low-temperature energy storage material can be used for storing surplus waste cold during an energy consumption peak, and release the stored cold at a valley. After the material is transported to other required places, the material is used for cold energy utilization equipment; the problem that the fluctuation of cold energy supply is great is solved; the utilization ratio of the cold energy is increased greatly; and the material is energy-saving, environment-friendly, better in stability and lower in toxicity, and can better meet cold accumulation requirements.

Description

technical field [0001] The invention relates to a low-temperature phase-change material, which is used for storing cold energy and a preparation method thereof, and belongs to the technical field of composite materials. Background technique [0002] The main force of my country's energy is coal. Although its proportion in the total energy is gradually decreasing, its total amount is still increasing. At present, the proportion of coal used for power generation has increased from 50% to more than 70%, and the mining and burning of coal have caused serious environmental pollution problems. According to statistics, more than 70%-80% of SO 2 , NOX, mercury, particulate matter, CO 2 etc. are caused by the direct combustion of coal. In this situation, it is difficult to reduce the emission of greenhouse gases in the environment, which reduces the power generation efficiency by about 10 percentage points. [0003] As a low-emission clean fuel, liquefied natural gas (LNG) is the...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 陈旭东
Owner SHANGHAI MARITIME UNIVERSITY
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