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Ceramic coating for power plant boiler heating surface and preparation method thereof

A ceramic coating and ceramic whisker technology, which is applied to the ceramic coating on the heating surface of power plant boilers and its preparation field, can solve the problems of easy cracks on the coating surface and damage to the protective performance, and achieve a dense and smooth coating surface with low equipment requirements , the effect of simple preparation method

Pending Publication Date: 2021-01-12
珠海弘德表面技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ceramic coatings are widely used in power plant boilers because of their oxidation resistance and high temperature corrosion resistance. However, when ceramic materials are used to make coatings, when the coating thickness is too large and the heating is uneven, the coating surface is prone to cracks and other problems. , its protective performance will be destroyed accordingly

Method used

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  • Ceramic coating for power plant boiler heating surface and preparation method thereof
  • Ceramic coating for power plant boiler heating surface and preparation method thereof
  • Ceramic coating for power plant boiler heating surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]

[0038] (1) Weigh low-melting point glass powder, ceramic whiskers, zirconia, zirconium phosphate and rare earth according to the formula, put them in a drying oven, bake at 200°C for 2 hours, and then mix to obtain a mixed powder.

[0039] (2) Add sodium water glass to the mixed powder and mix evenly to obtain ceramic coating.

[0040] The surface of the boiler tube wall is polished and cleaned, and then the prepared ceramic coating is evenly sprayed on the metal surface with an atomizing spray gun, the spraying pressure is 0.8MPa, and the coating thickness is 30-120μm. After the spraying is completed, the coating is naturally dried for 10 hours. After the furnace is turned on, it is solidified with the temperature of the furnace, and the coating does not appear cracks.

[0041] Then, when the boiler was used continuously for 180, 270, and 365 days, the appearance of the furnace tube was observed, as shown in figure 1 It can be seen that it is still as bright as n...

Embodiment 2

[0043]

[0044] (1) Weigh low-melting point glass powder, ceramic whiskers, zirconia, zirconium phosphate and rare earth according to the formula, put them in a drying oven, bake at 200°C for 2 hours, and then mix to obtain a mixed powder.

[0045] (2) Add sodium water glass to the mixed powder obtained in step (1), and mix evenly to obtain a ceramic coating.

[0046] The surface of the boiler tube wall is polished and cleaned, and then the prepared ceramic coating is evenly sprayed on the metal surface with an atomizing spray gun, the spraying pressure is 0.8MPa, and the coating thickness is 30-120μm. After the spraying is completed, the coating is naturally dried for 10 hours. After the furnace is turned on, it is solidified with the temperature of the furnace, and the coating does not appear cracks.

[0047] Then, when the boiler was used continuously for 180, 270, and 365 days, the appearance of the furnace tube was observed, and it was still as bright as new after one ...

Embodiment 3

[0049]

[0050]

[0051] (1) Weigh low-melting point glass powder, ceramic whiskers, zirconia, zirconium phosphate and rare earth according to the formula, put them in a drying oven, bake at 200°C for 2 hours, and then mix to obtain a mixed powder.

[0052] (2) Add sodium water glass to the mixed powder obtained in step (1), and mix evenly to obtain a ceramic coating.

[0053]The surface of the boiler tube wall is polished and cleaned, and then the prepared ceramic coating is evenly sprayed on the metal surface with an atomizing spray gun, the spraying pressure is 0.8MPa, and the coating thickness is 30-120μm. After the spraying is completed, the coating is naturally dried for 10 hours. After the furnace is turned on, it is solidified with the temperature of the furnace, and the coating does not appear cracks.

[0054] Then, when the boiler was used continuously for 180, 270, and 365 days, the appearance of the furnace tube was observed, and it was still as bright as new...

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Abstract

The invention belongs to the technical field of coatings, and discloses a ceramic coating for a power plant boiler heating surface and a preparation method thereof. The ceramic coating is mainly prepared from sodium water glass, low-melting-point glass powder, ceramic whiskers, zirconium oxide, zirconium phosphate, rare earth and a coagulant. The coating does not need to be subjected to high-temperature sintering and can be naturally converted into a ceramic phase at about 400 DEG C, and the ceramic rate reaches 75% or above; the coating formed after spraying is stable, corrosion-resistant andwear-resistant, and the wear resistance of the coating is more than 5 times that of 20 # steel; when the thickness of the coating is too large or the coating is not uniformly heated, no crack is generated; the surface of the coating is compact and smooth, molten ash particles are not prone to adhering to the heated surface, and good anti-sticking and anti-coking performance is achieved; the coating has good thermal conductivity, and the phenomenon of ash fusion and adhesion is not prone to occurring. The preparation method is simple and has low requirements on equipment.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a ceramic coating used for a heating surface of a boiler in a power plant and a preparation method thereof. Background technique [0002] Boilers are important energy conversion devices. Power plant boilers, especially large coal-fired power plant boilers, have boiler tubes including furnace water walls, superheater tubes, economizer tubes and other components. In the environment of chlorine corrosion, high temperature oxidation corrosion, and due to the different coal quality, some coal will produce some colloids after high temperature combustion, and these colloids will accumulate to a certain extent to form deposits with different thicknesses attached to the water wall. Thermal protection phenomenon occurs, which affects the heating efficiency of the boiler and causes energy waste. The coke will also make the heat conduction of the water-cooled wall uneven, and h...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B28/26
CPCC04B35/66C04B28/26C04B2235/9607
Inventor 胡东润
Owner 珠海弘德表面技术有限公司
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