ABSTRACT
This chapter discusses a detailed compartment modeling and computational fluid dynamics (CFD) modeling approach. It presents the application of CFD models to the study of some parts of the underground coal gasification (UCG) process. The chapter describes some examples of the application of CFD models to the UCG process. The state-of-the-art CFD models allow one to simulate large-scale UCG processes with the appropriate combination of other modeling approaches. The chapter also presents a multizonal model for gasification in Phase II of UCG. The typical time of Phase II of UCG depends on the thickness of the coal seam and the distance between the injection and production wells. The physical properties required as inputs to the model include porosity, permeability, and heat and mass-transport parameters for solid–gas interactions inside the rubble and between the cavity and its roof.
