We currenty run our coker heaters with a single outlet temperature setpoint. This ranges between 912 and 918 deg F depending on coke quality and foaming. We are considering running with a lower heater outlet temperature during the middle of the coking cycle in an attempt to reduce fuel gas usage. Does anyone currently run at various heater outlet temperatures during the coking cycle? Does anyone control their heater outlet temperatures at temperatures below 912 deg F? Is there a lower temperature limit that should be maintained?
