Flue modification method and flue anticorrosive structure

Abstract

The invention discloses a flue modification method and a flue anticorrosive structure. The flue modification method comprises: removing the original heat insulation layer and the inner liner layer ofa flue shell, and performing sandblasting, grinding and partial repairing on the inner wall of the flue shell; and then coating the inner wall of the flue shell with a primer layer, and after the primer layer is completely cured, adhering a glass brick to the primer layer with an adhesive to form a heat-insulating anti-corrosion layer. The flue anticorrosive structure comprises a flue shell, and is characterized in that the inner wall surface of the flue shell is covered with a heat-insulating anti-corrosion layer, and the heat-insulating anti-corrosion layer comprises a primer layer coveringthe inner wall surface of the flue shell and a glass brick attached to the primer layer with an adhesive. The invention utilizes the original concrete (brick) flue shell structure, and uses the superior anti-corrosion characteristics of the primer, the adhesive and the glass brick, thereby achieving the dual purpose of anti-corrosion and heat preservation in the wet flue gas environment, and provides a cost-effective flue modification structure with simple structure and an effective anti-corrosion layer.

Description

technical field [0001] The invention relates to a flue reconstruction method and its anti-corrosion structure, which belongs to the technical field of heavy anti-corrosion and is used for anti-corrosion treatment of concrete (brick) flues in thermal power plants, chemical industry, metallurgy and other industries. Background technique [0002] At present, with the development of my country's electric power industry, domestic thermal power plants, chemical industry, metallurgy and other power station units have entered the development stage of large units, supercritical parameters, and zero emissions. Coal-fired units need to desulfurize the flue gas before emitting it. Flue gas generally adopts wet desulfurization process. Wet flue gas desulfurization (FGD) is the most widely used desulfurization process. After desulfurization, the flue gas temperature is low, about 40-50 °C; saturated flue gas is discharged inside the flue and chimney Severe condensation will corrode the c...

AI Technical Summary

Problems solved by technology

Therefore, there is an urgent need for a scheme that can use the original concrete (brick) flue to directly transform the old flue, which not only has the function of thermal insulation, but also meets the anti-corrosion requirements, and solves the corrosion of the flue gas acid solution on the flue problems with destruction

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