COOLING AND CONDENSATION OF CRUDE COKE OVEN GAS IN INDIRECT PRIMARY COOLER

PURPOSE:To prevent corrosion of a cooler and save energy by cooling a high- temperature section of the cooler with pure water when crude coke oven gas is cooled with sea water by use of an indirect primary cooler. CONSTITUTION:Crude coke oven gas (COG) 2 produced in a coke oven 1 is humidified and cooled with a circulating liquid gas 6' in a drying main 3 and, after heavy tar, etc. are separated from it in a suction main 4, it is iintroduced into a indirect primary cooler 8. Pure water 13 is supplied to a high-temperature section 81 of the primary cooler 8 through a circulation tank 14, an auxiliary indirect cooler 16, etc. and countercurrent indirect heat exchange is performed between the pure water and the COG to cool the latter and recover heated pure water 18 for supply boilers. The cooled COG is then led into a condensation section 82 of the primary color 8 for cooling and condensation with sea water 22.