THE APPLICATION OF CAST IRON AIR PREHEATER IN THE REVAMP OF HYDROCRACKING UNIT FURNACE

Heat pipe air preheater has been replaced by domestic cast iron air preheater with double-sided fins because of its advantages of excellent corrosion resistance to dew point,good heat transfer performance,low leakage coefficient,little ash deposition and so on.Such preheater has been applied in the revamp of deferred waste heat recovery system in the reaction furnace and fractionation furnace of high pressure hydrocracking unit.This decreases the smoke exhaust temperature effectively,increases the efficiency of the furnace by 2%and reduces gas amount and energy consumption of the unit,which helps to achieve ideal economic benefits and ensure the stable production of the unit as well.