Method of thermal decoking of a cracking furnace and the downstream cracking gas cooler.

摘要

P The invention relates to a thermal decoking process of a cracking furnace (1) and the cracking gas cooler (5) provided with an inlet (4) and an outlet (6) located downstream. , in which a cleaning gas mixture is introduced into the oven, the temperature of the cleaning gas at the inlet of the cooler is lowered to 250 degrees C by addition of a coolant through the mixing tube (3) between the outlet (2 ) from the oven and the inlet (4) of the cooler, then the cooler is drained on the water side and the temperature of the cleaning gas in the oven is brought to 850 degrees C., after decoking the cleaning gas is brought to the inlet from the cooler to a temperature of 250 degrees C, then the cooler is filled with feed water and finally the supply of cleaning gas to the oven is interrupted and the cracking operation is restored. /P