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Nano-fluid for efficient heat transfer fluid, preparation method thereof and heat exchange device

A technology of nanofluids and graphene nanosheets, applied in the direction of nanocarbons, heat exchange materials, chemical instruments and methods, etc., can solve the problem of low heat conduction and heat transfer performance of nanofluids, difficult heat transfer and heat exchange of nanofluids Problems such as working fluid and difficulty in large-scale industrial production, etc., to achieve the effects of large-scale production, wide source of materials, and low price

Inactive Publication Date: 2019-02-26
ENN GRAPHENE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current nanofluids have the following disadvantages: 1. The specific gravity of metal or metal oxide nanoparticles requires a large amount of dispersant, which leads to an increase in interface thermal resistance and an increase in solution viscosity; 2. Although the specific gravity of carbon nanomaterials is low , but its structure is poor in hydrophilicity, and it is difficult to disperse uniformly in the water phase; 3. Conventional modification methods for carbon nanomaterials require the use of strong acids, strong bases, strong oxidants or harsh reaction conditions, and the post-treatment process is complicated , easy to corrode equipment, and high environmental protection costs; 4. Generally, the modification method of carbon nanomaterials can only meet the laboratory-scale preparation, and it is difficult to achieve large-scale and continuous industrial production; 5. Limited by the carbon nanostructure itself The nature and preparation process of nanofluids, the heat conduction and heat transfer performance of nanofluids are not high, and it is difficult to obtain cost-effective heat transfer and heat transfer nanofluid working fluids

Method used

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  • Nano-fluid for efficient heat transfer fluid, preparation method thereof and heat exchange device
  • Nano-fluid for efficient heat transfer fluid, preparation method thereof and heat exchange device
  • Nano-fluid for efficient heat transfer fluid, preparation method thereof and heat exchange device

Examples

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Effect test

Embodiment 1

[0057] Preparation method of nanofluid:

[0058] (1) With expanded graphite (fixed carbon content is 98%, particle diameter is 100 microns) as raw material, add water and polyethylene glycol p-isooctyl phenyl ether successively, the mass ratio of the three is 1:3.8:0.2, Stir and mix evenly at room temperature, mix and disperse in a high-pressure homogenizer for 30 minutes, and then grind and peel for 2 hours through a pin-type sand mill. (i.e. the mixture of expanded graphite, water and polyethylene glycol to isooctyl phenyl ether) is 15kWh / kg, obtains the graphene puree containing 20wt% graphene nanosheet;

[0059] (2) The specific surface area and pore volume of the graphene nanosheets in the graphene protoplasm were tested by BET method (using the model ASAP2460, the specific surface tester of Micromeritics), which reached 2711m3 respectively. 2 / g and 1.276cm 3 / g (eg image 3 shown);

[0060] (3) The chemical structure of graphene nanosheets in the graphene protoplasm...

Embodiment 2

[0066] Preparation method of nanofluid:

[0067] (1) With expanded graphite (fixed carbon content is 95%, particle size is 5 microns) as raw material, add water and sodium dodecylbenzenesulfonate successively, the mass ratio of the three is 1:8.8:0.2, at room temperature Stir and mix evenly, mix and disperse in a high-pressure homogenizer for 30 minutes, and then grind and peel off for 2 hours through a pin-type sand mill. The ratio of graphite, water and polyethylene glycol to the mixture of isooctyl phenyl ether) is 2kWh / kg, obtains the graphene puree containing 10wt% graphene nanosheet;

[0068] (2) add water to the graphene protoplasm and dilute the concentration of graphene nanosheets to 0.05wt%, homogenize by a high-speed shear emulsifier for 30 minutes, the energy consumed by high-speed shear emulsification and the quality of the processed material (i.e. the original graphene The ratio of slurry and water) is 0.1kWh / kg to obtain a uniformly dispersed nanofluid, wherein...

Embodiment 3

[0071] Preparation method of nanofluid:

[0072] (1) Take expanded graphite (fixed carbon content of 99.9%, particle size of 1000 microns) as raw material, add water and sodium lauryl sulfate in turn, the mass ratio of the three is 4:5.8:0.2, stir and mix at room temperature Evenly, mix and disperse in a high-pressure homogenizer for 30 minutes, and then grind and peel off for 2 hours through a pin-type sand mill. The ratio of water and polyethylene glycol to the mixture of isooctyl phenyl ether) is 100kWh / kg, obtains the graphene puree containing 40wt% graphene nanosheet;

[0073] (2) add water to the graphene protoplasm and dilute the concentration of graphene nanosheets to 0.1wt%, homogenize by high-speed shear emulsification machine for 30 minutes, the energy consumed by high-speed shear emulsification and the quality of the processed material (i.e. the original graphene The ratio of slurry and water) is 0.1kWh / kg to obtain a uniformly dispersed nanofluid, wherein the max...

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Abstract

The invention provides a nano-fluid, a preparation method thereof and a heat exchange device. The preparation method of the nano-fluid comprises the following steps: mixing expanded graphite with a stripping agent in a first base fluid to obtain a first mixture, and performing in-situ liquid phase stripping treatment on the first mixture to obtain a raw graphene stock containing graphene nano-sheets; and uniformly dispersing the raw graphene stock into a second base fluid to obtain the nano-fluid. The inventors have found that the method is simple and convenient to operate, facilitates large-scale production, is safe and environment-friendly, and can obtain the nano-fluid with high heat transfer coefficient, high thermal conductivity, low flow resistance and long-term stable dispersion.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and thermal energy utilization, in particular to a nanofluid oriented to high-efficiency heat-exchange working fluid, a preparation method thereof, and heat-exchange equipment. Background technique [0002] Nanofluids have special thermal radiation characteristics and enhanced heat transfer properties, which can greatly increase the thermal conductivity and heat transfer coefficient of heat transfer working fluids, making nanofluids have unique application prospects in the field of thermal energy utilization. At present, nanoparticles commonly used to prepare nanofluids include metals, metal oxides, and carbon-based materials, etc., and are equipped with dispersants that can wrap nanoparticles to balance the influence of particle gravity and ensure the stability of nanofluids. However, the current nanofluids have the following disadvantages: 1. The specific gravity of metal or metal oxide na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C09K5/08C09K5/10C09K5/14
CPCC01B32/19C01B2204/20C01B2204/24C01B2204/28C01B2204/32C09K5/08C09K5/10C09K5/14
Inventor 徐欢刘芳芳于钦刘婷婷靳琳浩许桂涛马青喜李金来
Owner ENN GRAPHENE TECH CO LTD
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