Refinery Fuel Gas System

The refinery fuel gas system is designed to supply fuel gas to steam boilers, process furnaces, gas engines, and gas turbines at a regulated pressure and reasonably constant heating value. The system includes mixing drum controls and distribution piping. Wherever necessary, a stand by storage of liquefied petroleum gas (LPG) is included. A typical refinery fuel gas system is shown in Figure 10-10.

The mixing gas drum is typically operated at 30 to 40 psig, which allows for delivery of gas at burners approximately 15-20 psig. For refineries with an operating gas turbine, the drum pressure is much higher, at 125 psig. The mixing vessel is fitted with mixing baffles and a steam coil for vaporizing any liquid carryover or LP gases. Refinery gas burners are designed for a particular heating value and gas density. The composition of gas to the gas mixing drum is so adjusted that large changes in calorific value or density of gas to various refinery furnaces are avoided. For example, it may not be possible to replace refinery gases with high calorific value and density totally with natural gas with lower calorific value and density without affecting performance of the furnaces using them.



Lpg Distillation
Figure 10-10. Refinery home fuel (gas) system.

Refinery Off-Site Facilities and Utility Systems 307 NOTES

1. T. A. Brzustowski and E. C. Sommer, Jr. "Predicting Radiant Heating from Flares," Proceedings of the Division of Refining, A.P.I. 53 (1973), pp. 865-893.

2. J. F. Straitz and R. J. Altube. "Flare Design and Operation." National Airoil Burner Company (USA) bulletin.

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