physical wear

       physical wear



1. Repair of impeller, guard plate and large and small head of desulfurization circulating pump in power plant 1. Reasons for wear and corrosion: Chemical corrosion: The slurry is corrosive, and it is easy to chemically react with the metal materials on the impeller to form chemical corrosion. Secondly, the electron transfer caused by the potential difference formed on the surface of the impeller, the oxidation reaction occurs, and the metal is directly damaged; Physical wear: Due to the large amount of particulate matter such as limestone and gypsum in the slurry, the suction and discharge ports of the pump directly Impact and damage caused by pump impeller, guard plate, etc.; Cavitation: due to pump design or pipeline and other on-site working conditions (such as pump selection too small, impeller speed too fast, pipeline blockage, etc.) When bubbles are formed, the generated bubbles will enter the high-pressure area with the liquid from the low-pressure area. In the high-pressure area, the bubbles will shrink and condense sharply, and the surrounding liquid will rush to the space occupied by the original bubbles at a very high speed, resulting in high-intensity shock waves. The impeller and pump casing and other over-current components generate noise and cause vibration. Due to the repeated impact force for a long time and the chemical corrosion of trace dissolved oxygen in the liquid, spots and cracks appear on the local surface of the impeller, and even spongy damage. Pump manufacturer's quality: The impeller is easy to wear and crack due to the failure of quenching or other processes when the manufacturer casts the impeller.