Abstract: The main function of the contacting cooling system as a part of delayed coking unit is to cool the high temperature steam, oil and gas during the large blow steaming, the water feeding and the oil and gas preheating from the treatment tower of the coke tower. Some problems exist, such as the corrosion of cooling water tank in the bottom of contacting cooling tower, the water containing oil in the bottom of the tower and the cavitation corrosion of the bottom pump. A series of optimized measures were adopted for contacting cooling system: stop using the cooling water tank; using the cross line process, and adding an atomization spray system and heat exchangers in entrance and bottom of the cooling tower, respectively to effectively solve the problems, and to save the equipment maintenance investment and reduce the processing costs about 75 000 RMB/a.

Key words: delayed coking, contacting cooling system, cooling water tank, atomization spray system, heat exchanger