High temperature, contamination and slagging resistant ceramic paint as well as preparation method and application of high temperature, contamination and slagging resistant ceramic paint

Abstract

The invention provides high temperature, contamination and slagging resistant ceramic paint, as well as a preparation method and an application of the high temperature, contamination and slagging resistant ceramic paint and belongs to the technical field of special paint. The ceramic paint comprises the following ingredients by mass percentage: 15-30% of filling, 40-65% of adhesive agent and the balance of water, wherein the filling comprises 3-5% of zirconia, 3-5% of silicon carbide, 3-5% of silicon nitride, 1-3% of titanium dioxide, 2-4% of kaoline and 3-8% of rare earth oxide. The preparation method of the paint comprises the steps of mixing the adhesive agent with the water to prepare adhesive agent liquid, adding the filling refined into a particle size to be up to 50-900nm into the adhesive agent liquid, adding an assistant, uniformly mixing, filtering and packaging. The paint can be applied on the external surfaces of a boiler tube and a heater tube to form a ceramic coating to prepare the high-performance boiler tube and the heater tube.

Description

technical field [0001] The invention belongs to the technical field of special coatings, and in particular relates to a high-temperature-resistant, stain-resistant and slagging-resistant ceramic coating as well as its preparation method and application. Background technique [0002] In the production and operation of power station boilers, petroleum and petrochemical heating furnaces, and small and medium-sized industrial boilers, the contamination of pulverized coal boilers (including fuel gas heating furnace tubes) has caused great hidden dangers to the safe operation of boilers, and at the same time affects the efficiency of boilers and heating furnaces. Under the action of flue gas, the ash and slag bonded to the water wall or high temperature superheater and the furnace tube of the heating furnace will undergo complex chemical reactions with the tube wall to form high temperature corrosion. Contamination and slagging are generally considered to be the prelude to high-te...

AI Technical Summary

Problems solved by technology

Contamination and slagging on the high-temperature heat exchange surface directly leads to a decrease in the heat exchange capacity of boilers and heating furnaces, a reduction in furnace efficiency and output, and uneven heating of the heat exchange surface leads to uneven thermal stress of the furnace tube and uneven heating of the heated working medium. The rise in temperature leads to overheating of the furnace tube, the generation and emission of nitrogen oxides intensifies, and the exhaust gas temperature is too high. Contamination and slagging aggravate the corrosion of the heat exchange surface. Production capacity, reduce the service life of equipment, and bring heavy losses to the enterprise

[0003] For contamination and slagging, the traditional solution is to strengthen soot blowing, adjust fuel, put into operation decoking agent, mechanical coking, etc., which will bring continuous economic losses to enterprises, and safety hazards still exist

[0004] As a new type of functional material, ceramic coatings can resist high temperature corrosion and increase emissivity, but the existing ceramic coatings cannot solve the problems of high contamination and high temperature corrosion, especially reductive corrosion, so the above functions cannot be realized comprehensively , and there are cracks, peeling, and pulverization of the coating to varying degrees during use, which seriously affect the service life of the coating. At present, these problems cannot be effectively solved

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