Coke cleaning in the cracking furnace
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Why is the excess air volume during coking cleaning of the ethylene cracking furnace (USC furnace) much higher than the normal value (10%) – around 150% – is it due to process requirements (such as a decrease in the amount of fuel gas, which requires more air to maintain combustion), or is it because the burner dampers are not adjusted?
Does anyone have the startup procedure for a pyrolysis furnace? It would be great if it included details on the operation of each valve. Thank you!
It is a normal operational requirement for the amount of excess air to be higher during coke cleaning than the normal value; however, a 150% increase is not normal – it may be due to improper adjustment of the dampers, or false readings from the oxygen analyzer