Abstract: The treatment process of decoking effluent includes dry wet decoking and recycling it to firebox. The former separates coke powder through the coke tank, and the vent gas is directly discharged into the atmosphere, causing environmental pollution. The latter introduces decoking effluent into the firebox to remove coke powder through combustion, and then the flue gas is discharged into the atmosphere. Recycling decoking effluent to firebox is energy-saving and environmentally friendly, but it affects the stability of dry-out operation, increases the difficulty of pre-sulfiding and decoking, restricts the operation of de-NO_X system, increases the difficulty of maintenance operation, and causes significant process fluctuations. This article focuses on the operation problems in recycling decoking effluent to firebox, and explores process disposal measures through cause analysis to ensure the long-term operation of recycling decoking effluent to firebox and to reduce its impact on process operation.

Key words: decoking effluent, recycling to firebox, operation problem, process disposal