Development of a mathematical model of a steam-reforming furnace

Mathematical models are developed for a steam reforming furnace in both the steady state and unsteady state modes of operation. The one-dimensional radiation field in a
participating medium is resolved into various classes of rays which distribute radiant energy to the furnace tubes carrying the process gas.

Results predicted by the model are found to compare satisfactorily with values measured on an actual plant.

A preliminary analysis of the thermal shock effects that arise during transient conditions in the furnace is made and limits on the safe rote of change of load level are indicated.