Heat Treatment Technique on Site for Large Scale Pressure Vessel

By taking the 3. 5Mt/a catalytic cracking regenerator of Dalian Petro - Chemical Plant as an example, the research on new heat treatment process on site is conducted. The technical problem of heat treat-ment of ultra large equipment, such as difficult temperature regulation and unevenness of large volume with changed sections and changed wall thickness, are solved through setting up necessary guiding device to direct heat air current, adopting slight positive pressure internai combustion process, providing a new type of large power fuel spray nozzle, using distributing control system (DCS) to adjust oil - seal proportion and heat quantity exhausting opening of chimney and adding supplementary electrical heat treatment for ultra thick wall. The practice proves that the heat treatment technique has advantages of short construction period and cost - efficiency.