Metal Erosion Reason Analysis of Plate Type Heat Exchanger
This article introduces the structure and running situation of welding plate type heat exchanger of 300MW gas-steam combined cycle unit（BFG-CCPP） heating system. The heat exchanger material was judged to be 316L stainless steel regarding the crack and erosion problem of corrugated plate heat exchanger welding line. Starting from distribution and origin of crack, morphology observation and analysis of metal elements were made to the crack and tear parts. The analysis shows that the risk of stress corrosion crack on heat exchanger is small under the condition of present working temperature and chloride ion content. The main cause of heat exchanger leakage lies in welding line erosion and concentrated thermal stress.
plate type heat exchangercorrugated plate heat exchangererosion of welding lineanalysis
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