Abstract: The main media in the coke drum venting process in delayed coking unit are venting gas and steam, which contains coke powder and sulfides. In order to avoid the blockage and pipeline corrosion of dry gas low pressure separator caused by coke powder and sulfides, the refinery decided to enter the venting gas of coking unit into coking wet gas compressor. The industrial application results showed that excessive coke powder blocked the tube bundle of air cooler at the top of fractionator, and also affected the heat transfer of water cooler, which needs tracking detection; no obvious impact on the operation of coking wet gas compressor was found, the vibration value of the compressor and the flow rate of main seal gas only slightly increased; the venting and coke cooling rate were not affected. When the pressure of the vent cooling tower was close to that of the fractionator tower, the venting gas should be changed into the low-pressure flare system in time; the desorbed gas could be completely consumed through the converter; At the same time, the cleaning frequency of dry gas compressor cooler in the low-pressure dry gas separation unit was from once a month to more than 4 months, which realizes the long-term operation of dry gas compressor.

Key words: delayed coking, venting gas, wet gas compressor, coke powder, corrosion