Preparation method of anti-coking composite ceramic coating for power station boiler

A technology of composite ceramics and ceramic coatings, applied in coatings, metal material coating processes, fusion spraying, etc. Quality and other issues, to achieve the effect of prolonging safety and service life, improving emissivity and thermal conductivity, and improving heat exchange efficiency

Active Publication Date: 2022-05-24
ZHONGDIAN HUACHUANG ELECTRIC POWER TECH RES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nickel-based alloy composite coating was prepared by the supersonic arc spraying method, but the high temperature in the arc caused serious burning and evaporation of the alloying elements, resulting in the reduction of the alloying elements in the coating, which seriously affected the quality of the coating.
Moreover, the alloy coating has poor resistance to high temperature chlorine corrosion, and there is serious coking and slagging phenomenon.

Method used

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  • Preparation method of anti-coking composite ceramic coating for power station boiler
  • Preparation method of anti-coking composite ceramic coating for power station boiler
  • Preparation method of anti-coking composite ceramic coating for power station boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation operation steps of an anti-coking composite ceramic coating for utility boilers are as follows:

[0033] (1) Preparation of thermochemical reaction ceramic coating materials

[0034] (1.1) Mix 5kg of chrome green, 7kg of boron nitride and 28kg of alumina to obtain aggregate.

[0035] (1.2), mix 29.8kg of phosphoric acid with a mass concentration of 85%, 1.5kg of magnesium oxide, 3kg of aluminum hydroxide, 3kg of zinc oxide and 14.7kg of deionized water to obtain a binder;

[0036] (1.3) Mix the aggregate, the binder and 2 kg of polyacrylic acid, stir evenly, add deionized water to adjust the acidity pH to 2, and obtain a thermochemical reaction ceramic coating material.

[0037] (2) Preparation of surface glaze material

[0038] Mix 37kg of spodumene powder, 27kg of alumina micropowder, 17kg of calcium carbonate micropowder, 4kg of modified glass fiber, 4kg of potassium feldspar, and 4kg of zirconia to obtain a surface glaze layer material.

[0039] (...

Embodiment 2

[0046] The preparation operation steps of an anti-coking composite ceramic coating for utility boilers are as follows:

[0047] (1) Preparation of thermochemical reaction ceramic coating materials

[0048] (1.1) Mix 5kg of chrome green, 15kg of boron nitride and 15kg of alumina to obtain aggregate.

[0049] (1.2) Mix 28.6kg of phosphoric acid with a mass concentration of 85%, 1.4kg of magnesium oxide, 2.9kg of aluminum hydroxide, 2.9kg of zinc oxide and 14.2kg of deionized water to obtain a binder.

[0050] (1.3) Mix the aggregate, the binder and 2kg of polyacrylic acid, stir evenly, add deionized water to adjust the appropriate viscosity and acidity pH to 1, and obtain a thermochemical reaction ceramic coating material.

[0051] (2) Preparation of surface glaze material

[0052] Mix 35kg of spodumene powder, 25kg of alumina micropowder, 15kg of calcium carbonate micropowder, 3kg of modified glass fiber, 3kg of potassium feldspar, and 3kg of zirconia to obtain a surface glaz...

Embodiment 3

[0060] The preparation operation steps of an anti-coking composite ceramic coating for utility boilers are as follows:

[0061] (1) Preparation of thermochemical reaction ceramic coating materials

[0062] (1.1) Mix 5kg of chrome green, 32kg of boron nitride and 8kg of alumina to obtain aggregate.

[0063] (1.2) Mix 31.4 kg of phosphoric acid with a mass concentration of 85%, 1.6 kg of magnesium oxide, 3.2 kg of aluminum hydroxide, 3.2 kg of zinc oxide and 15.6 kg of deionized water to obtain a binder.

[0064] (1.3) Mix the aggregate, the binder and 5kg of polyacrylic acid, stir evenly, add deionized water to adjust the appropriate viscosity and acidity pH to 3, and obtain a thermochemical reaction ceramic coating material.

[0065] (2) Preparation of surface glaze material

[0066] Mix 35kg of spodumene powder, 25kg of alumina micropowder, 15kg of calcium carbonate micropowder, 3kg of modified glass fiber, 3kg of potassium feldspar, and 3kg of zirconia to obtain a surface ...

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Abstract

The invention relates to a preparation method of an anti-coking composite ceramic coating for a power station boiler, and belongs to the technical field of high-temperature protective coatings. The invention particularly relates to an anti-coking composite ceramic coating material and a preparation method thereof. The composite ceramic coating material is composed of a thermal chemical reaction ceramic bottom layer and a surface glaze layer. The thermal chemical reaction ceramic bottom layer comprises the following raw materials: aggregate, a binder, a dispersing agent and water; the aggregate is prepared by uniformly mixing chrome green, boron nitride and aluminum oxide; the binder is prepared by uniformly mixing phosphoric acid with the mass concentration of 85%, magnesium oxide, aluminum hydroxide, zinc oxide and deionized water; the dispersing agent is polyacrylic acid. The bonding strength of the anti-coking composite ceramic coating is 26.6-30.2 Mpa, the high temperature corrosion resistance index is 0.116-0.158 mg/mm < 2 >, and the thermal shock resistance index is 7-15. The boiler surface is effectively prevented from coking, and the heat efficiency of the boiler is improved to a small extent. And the actual service life of the coating can exceed 10000 hours, so that the use safety and the service life of the boiler are prolonged.

Description

technical field [0001] The invention belongs to the technical field of high-temperature protective coatings, and in particular relates to a preparation method of an anti-coking composite ceramic coating. Background technique [0002] The heating surface of large-scale power station boilers is prone to problems such as high temperature corrosion resistance, fouling and slagging resistance, and poor flow resistance wear resistance during operation, which leads to an increase in the exhaust gas temperature of the boilers of the unit, which greatly restricts the efficient use of combustion power generation in the power station. Coating protection is an important way to solve these problems. [0003] In order to solve the coking problem of power station boilers, researchers have developed a series of high-temperature protective coating materials, such as: a nano-ceramic coating that is anti-coking, wear-resistant and high-temperature sulfur corrosion resistant. The ceramic coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/131C23C4/10
CPCC23C4/131C23C4/10
Inventor 初希俞卫新徐应根代真周建中明喆王平牛晓鸣陶康宁
Owner ZHONGDIAN HUACHUANG ELECTRIC POWER TECH RES
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