Causes Analysis and Countermeasures for Cracking of Welds in the Flue Gas Pipe of Catalytic Cracking Units
The high temperature flue gas pipe from the third cyclone separator to the inlet of the flue gas turbine is an important part of the flue gas energy recovery system,which is of great significance in realising the energy saving and environmental protection of the catalytic cracking unit.According to the cracking situation of the high temperature flue gas pipe in the catalytic unit of a refinery company,the causes of cracking were analyzed and summarised from various aspects.It is concluded that low temperature dew point corrosion,σ embrittlement of materials,high temperature creep,improper insulation and stress concentration are the main causes of pipe cracking.According to the actual operation of the catalytic cracking unit,some countermeasures were proposed,such as strengthening the weld,recording the deformation of the expansion joint and support hanger,improving the thermal insulation and selecting the appropriate welding rod,which have reference significance for the smooth operation of the catalytic cracking unit.
catalytic cracking unitflue gas pipeweldcrackhigh temperature
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