Preparation method of high-temperature-resistant abrasion-resistant coating of circulating fluidized bed boiler

Abstract

The invention discloses a preparation method of a high-temperature-resistant abrasion-resistant coating of a circulating fluidized bed boiler. The method comprises the following steps of (1) performing sand-blasting roughening on the surface of a circulating fluidized bed boiler component; (2) sequentially washing the surface subjected to the sand-blasting roughening by acetone and ethyl alcohol; performing drying; (3) performing plasma spraying of Cr3C2-NiCr-WC particles on the roughened and cleanly cleaned surface, wherein the plasma spraying process conditions include the values as follows: the main gas pressure is 0.7 to 1.0MPa; the auxiliary gas pressure is 0.6 to 0.9 MPa; the main gas flow rate is 1300 to 1800 l / h; the auxiliary gas flow rate is 900 to 1100 l / h; the arc current is 450 to 600A; the arc voltage is 85 to 100 V; the powder conveying gas pressure is 0.2 to 0.4 MPa; the powder conveying gas flow rate is 280 to 400 l / h; the spraying distance is 100 to 150 mm; the spraying speed is 2 to 3 kg / h; the coating thickness is 1 to 2.5 mm. When the coating is used for the circulating fluidized bed boiler, high-temperature correction resistance and high-temperature abrasion resistance can be realized; in addition, the coating is firm and cannot fall off.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler. Background technique [0002] The difference between a circulating fluidized bed boiler and a conventional boiler is that its combustion system is different. Gas-solid material separation equipment and solid material recirculation equipment are the main features of circulating fluidized bed boilers. The combustion of circulating fluidized bed boiler includes two processes of internal circulation and external circulation. The internal circulation is the circulation process in the furnace, that is, the flue gas moving at high speed in the furnace is in close contact with the solid particles with strong turbulent disturbance, and there are a large number of Fluidized combustion reaction process with particle backmixing. The outer circulation is the process of coll...

AI Technical Summary

Problems solved by technology

This defect has not been well resolved, which limits the further popularization and application of circulating fluidized bed boilers.