For a VTB coker, I’m assuming that the heater decoke interval is 3-6 months or less in some special cases. For an anode grade coker, does anyone have any input as to how long is the decoke interval for that application?
The fouling rate is very dependent on the feed quality (concarbon) and the heater flux rate. Generally an anode coker that has a normal flux rate will operate with a 8 to 14 month window. One year operations used to be normal for sponge (anode) coke. In today’s world with vey heavy sour (SDA pitch) feeds the normal run time is about 3 to 6 months. We also design for online spalling and pigging to help this issue.
