Air Preheat System Upgrade on Coker Heaters
- Conference: Southwest Process Technology Conference
- Year: 2019
- Proceeding: 11th AIChE Southwest Process Technology Conference
- Group: Southwest Process Technology Conference
- Time: Tuesday, October 1, 2019 - 10:00am-10:30am
New APHs were designed for higher heat transfer duty than the existing APHs, and new FD and ID fans were redesigned for higher capacities than the existing fans. A new steam preheat coil was installed at the inlet of the main APH. The steam preheat coils and combustion air by-pass ducts were designed to minimize the acid dew point corrosion in the APH cold blocks. The new combustion air by-pass ducts were sized for 100% by-pass of combustion air. This would help run the heater on forced draft when the APHs get corroded. The existing convection section had two future row provisions. Two rows of process coils were installed to maximize the heater efficiency. The heaters have been commissioned successfully and have been operating for the past six months.
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