NHT and Platformer Heater Capacity Increase Project
Furnace Improvements (FIS) was employed to develop the best capacity improvement scheme for its #2 Platformer Heater and NHT Heaters.
The Platformer Heater (H-20/21/22) was originally designed for 12,000 BPD operation and rated for 119.6 MMBtu/hr process heat duty. The design thermal efficiency of the heater is ~ 88% and is currently operating at 80 – 81%.
There are three vertical Cylindrical Heaters along with the Platformer Heaters, which share a common convection section and a stack. They are the Hydrotreater Charge Heater (H-18), Hydrotreater Stripper Reboiler (H-19) and Depropaniser Reboiler (H-23).
The heaters were running at 13,000 to 15,000 BPD charge rate. They wished to revamp the heaters to 18,000 BPD capacity.
The conventional revamp option was to extend the existing radiant cells. The other option was to install a new heater for extra duty required. Extending radiant cells has the following disadvantages:
Higher firing rates
Very high cost