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Super-amphiphobic composite coating on heat exchange tube, preparation technology of super-amphiphobic composite coating and flue gas heat exchange device based on super-amphiphobic composite coating

A technology of composite coating and preparation process, which is applied to devices, coatings, indirect heat exchangers and other directions for coating liquid on the surface, which can solve the problems of discontinuous supply of hot air and discontinuous process.

Pending Publication Date: 2021-03-19
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid gas in the flue gas is easy to corrode the heat exchange tube. Even if the expensive 316L steel is used, it can only be used for 2-3 months before it needs to be repaired and replaced. Parking for replacement and maintenance will inevitably cause discontinuity in the process and discontinuity of hot air. continuous supply

Method used

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  • Super-amphiphobic composite coating on heat exchange tube, preparation technology of super-amphiphobic composite coating and flue gas heat exchange device based on super-amphiphobic composite coating
  • Super-amphiphobic composite coating on heat exchange tube, preparation technology of super-amphiphobic composite coating and flue gas heat exchange device based on super-amphiphobic composite coating
  • Super-amphiphobic composite coating on heat exchange tube, preparation technology of super-amphiphobic composite coating and flue gas heat exchange device based on super-amphiphobic composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Put the heat exchange tube into 0.5mol / L HCl solution, soak for 1.5h, neutralize with lye, rinse with tap water 3 times to neutralize, and dry in nitrogen atmosphere;

[0039] (2) The outer surface of the heat exchange tube and the inner surface of the shell are placed under a high-speed sandblasting machine, and sandblasting is performed to remove surface impurities, and at the same time, the surface is roughened;

[0040] (3) The fluorine-containing paint is evenly sprayed on the outer surface of the heat exchange tube and the inner surface of the shell under 0.5MPa, and the spray thickness is 20 μm to enhance its adhesion; the fluorine-containing primer is based on ethylene-tetrafluoroethylene copolymer. resin, wherein the fluorine content in the fluorine-containing primer is 35%;

[0041](4) 3g of ethylene-tetrafluoroethylene copolymer was added to 90ml of ethyl acetate, ultrasonically stirred for 20min, then 0.5g of ZnO nanoparticles, 0.1g of polyaniline and 0....

Embodiment 2

[0044] (1) Put the heat exchange tube into 1.0mol / L HCl solution, soak for 1 hour, neutralize with alkali solution, rinse with tap water for 3 times to neutralize, and dry in nitrogen atmosphere;

[0045] (2) The outer surface of the heat exchange tube and the inner surface of the shell are placed under a high-speed sandblasting machine, and sandblasting is performed to remove surface impurities, and at the same time, the surface is roughened;

[0046] (3) The fluorine-containing paint is uniformly sprayed on the outer surface of the heat exchange tube and the inner surface of the shell under 1.5MPa, and the spray thickness is 30 μm to enhance its adhesion; the fluorine-containing primer is based on ethylene-tetrafluoroethylene copolymer. resin, wherein the fluorine content in the fluorine-containing primer is 35%;

[0047] (4) 0.3g of ethylene-tetrafluoroethylene copolymer was added to 9ml of ethyl acetate, ultrasonically stirred for 20min, and then 0.05g of ZnO nanoparticles...

Embodiment 3

[0050] (1) Put the heat exchange tube into 0.7mol / L HCl solution, soak for 1 hour, neutralize with alkali solution, rinse with tap water for 3 times to neutralize, and dry in nitrogen atmosphere;

[0051] (2) The outer surface of the heat exchange tube and the inner surface of the shell are placed under a high-speed sandblasting machine, and sandblasting is performed to remove surface impurities, and at the same time, the surface is roughened;

[0052] (3) The fluorine-containing paint is uniformly sprayed on the outer surface of the heat exchange tube and the inner surface of the shell under 1.0MPa, and the spray thickness is 25 μm to enhance its adhesion; the fluorine-containing primer is based on ethylene-tetrafluoroethylene copolymer. resin, wherein the fluorine content in the fluorine-containing primer is 35%;

[0053] (4) 0.6g of ethylene-tetrafluoroethylene copolymer was added to 18ml of ethyl acetate, ultrasonically stirred for 30min, and then 0.1g of ZnO nanoparticles...

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Abstract

The invention discloses a super-amphiphobic composite coating on a heat exchange tube, a preparation technology of the super-amphiphobic composite coating and a flue gas heat exchange device based onthe super-amphiphobic composite coating, and belongs to the technical field of corrosion prevention and coking prevention of heat exchange tubes of flue gas heat exchangers. Impurities on the surfaceof the heat exchange tube are removed through hydrochloric acid, then residual acid liquor on the surface is neutralized, sand blasting treatment is further conducted to increase the adhesive force ofthe coating, later coating spraying is facilitated, and the first primer layer is used for further increasing the adhesive force of the coating and facilitating adhesion of the second composite coating. Special heat exchange tube arrangement, tube wall thickening and nano-microstructure composite self-cleaning surface coating construction are combined for use, so that the corrosion resistance andthe self-cleaning performance of the heat exchange tube are improved, and the frequency of cleaning and replacing the heat exchange tube is reduced. The combination is superior to independent adoption of heat exchange tube arrangement, tube wall thickening and nano-microstructure composite self-cleaning surface coating construction.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion and anti-coking of a heat exchange tube of a flue gas heat exchanger, and relates to a super-amphiphobic composite coating on a heat exchange tube, a preparation process thereof, and a flue gas heat exchange device based thereon. Background technique [0002] Coal is an important primary energy source in my country at present. The key technologies and industrialization of low-rank coal separation and utilization have an important impact on coal utilization. The medium and low temperature dry distillation technology is called the "leader" of coal separation and utilization. In the process of coal separation and utilization, the blue carbon industry is derived. The flue gas generated in the production process of blue carbon contains a large amount of acid gas and dust. The acid gas will aggravate the corrosion of the heat exchanger, and the dust will increase the heat transfer resistance of t...

Claims

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Application Information

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IPC IPC(8): B05D5/08B05D7/24B05D3/10F28D7/16F28F1/00F28F19/04C09D123/08C09D7/61C09D7/63C09D7/65
CPCB05D5/083B05D7/582B05D7/24B05D3/102C09D123/0892C09D7/61C09D7/63C09D7/65F28F19/04F28F1/00F28D7/16C08K2201/011C08K2003/2296B05D2506/10B05D2601/22F28F2245/08C08L79/02C08K3/041C08K3/22C08K5/5419B05D2420/01B05D2420/02
Inventor 任国瑜谯泽庭闫朝孟江折雨华苏博雅杜兴杰钟媛媛
Owner YULIN UNIV
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