Analysis and Preventive Measures for Wear and Leakage of Water Wall in 660 MW Supercritical Circulating Fluidized Bed Boiler
After continuous operation for 197 days,a 660 MW supercritical CFB boiler in a power plant experienced a sudden leakage accident of its water-cooled wall tubes.To reveal the essential cause of the leakage,a combination of macroscopic morphology measurement,spectral analysis,metallographic structure testing,and mechanical property testing was used to deeply analyze the location of the leakage.The results indicate that the main cause of leakage in water-cooled wall tubes is material wear,resulting in a reduction in the effective thickness of the wall tubes,which cannot withstand internal pressure and leaks.In response to the above situation,feasible preventive measures are proposed to prevent similar accidents from happening again and ensure the safe,stable and continuous operation of the unit.At present,the two units have been operating for more than 500 days,and there has been no case of water wall leakage caused by wear and tear,proving the effectiveness of preventive measures.
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