Cause Analysis and Countermeasures of Wall Reheater Crack
The 12Cr1MoVG pipe in a wall reheater of a power plant has a large area of transverse micro-cracks at the fixed/sliding joint position.The crack pipe section is sampled for macroscopic,composition,mechanical and metallographic analysis,and the crack causes are analyzed in combination with the heating condition,operating condition and structural arrangement of the unit.The results show that the insufficient design displacement margin of π-type round steel in the sliding node of the wall reheater leads to the expansion of the wall reheater tube,and fatigue cracks occur in the fixed/sliding node of the wall reheater under the action of alternating loads such as heating load fluctuation and furnace flue gas temperature change
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