Anti-corrosion and anti-coking coating for coal-fired boiler and spraying method thereof

Abstract

The invention relates to an anti-corrosion and anti-coking coating for a coal-fired boiler. The coating is coated on the surface of a water-cooled wall of the coal-fired boiler and comprises an anti-corrosion layer coated on a substrate and an anti-coking layer coated on a surface layer. The anti-corrosion layer is prepared by combining 10-100 parts by weight of flaky mica powder, 10-100 parts byweight of flaky talcum powder, 10-100 parts by weight of flaky bentonite powder and 10-100 parts by weight of flaky graphite powder through binding agent silicon resin, and the weight part of the silicon resin is 20-300 parts by weight; the anti-coking layer is prepared from the following components in parts by weight: 5-80 parts of boron nitride, 5-60 parts of zirconium oxide, 5-60 parts of cerium oxide and 5-60 parts of lanthanum oxide powder, the binding agent is silica sol or zirconium sol, and the weight part of the binding agent is 10-200 parts. The coating is mainly made of an inorganicmaterial, has good high-temperature resistance, corrosion resistance and coking resistance, and has double-layer protection on the metal furnace tube; the problems of coking and corrosion of the furnace tube are effectively reduced, the hearth temperature and the smoke exhaust temperature are reduced, the heat exchange efficiency of the furnace tube is improved, and the coal consumption is reduced so that the service life of the boiler is effectively prolonged, and the operation safety and stability are effectively improved.

Description

technical field [0001] The invention relates to the technical field of boiler anti-coking, in particular to an anti-corrosion and anti-coking coating for coal-fired boilers and a spraying method thereof. Background technique [0002] For coal-fired thermal power, the long-term stable operation of coal-fired boilers is the focus of all work of power generation enterprises. In recent years, with the change of pulverized coal quality, most boilers have the problem of coking corrosion, which seriously affects the normal operation of the boiler. On the other hand, during the coal-fired combustion process of the coal-fired boiler, the heating surface of the water-cooled wall pipe is coked, and the pipes of the superheater and reheater accumulate dust, which reduces the heat exchange efficiency of the boiler, increases the exhaust gas temperature, and increases energy consumption. The heating surface is prone to sulfate corrosion due to severe coking, shortening the service life o...

AI Technical Summary

Problems solved by technology

In recent years, with the change of pulverized coal quality, most boilers have the problem of coking corrosion, which seriously affects the normal operation of the boiler

On the other hand, during the coal-fired combustion process of the coal-fired boiler, the heating surface of the water-cooled wall pipe is coked, and the pipes of the superheater and reheater accumulate dust, which reduces the heat exchange efficiency of the boiler, increases the exhaust gas temperature, and increases energy consumption. The heating surface is prone to sulfate corrosion due to serious coking, shortening the service life of the boiler, etc.

The above problems will seriously affect the safety and economical operation of boilers.

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