Model Study of Combined Forced and Free Convection in Underground Coal Conversion of Thin Coal Seams. Annual Report January 1984 - January 1985

摘要

An experimental test model, which is dynamically similar to an actual UCC (Underground Coal Conversion) system, has been used to determine fluid flow patterns and local heat transfer that occur in the UCC burn cavity. This study was designed to provide insight into the little understood mechanisms (i.e., heat transfer and oxygen transport to the cavity walls) which control maximum cavity width, and therefore resource recovery during UCC. Due to difficulties associated with the installation of utilities for this project, we were unable to begin the experimental studies at Texas Tech. The utilities are now installed and the system has been checked out and is ready to conduct the necessary experimental studies. The experimental studies will be designed to study the effects of a growing cavity upon the transport to the side walls of a UCG cavity. The flow model will be used to study the effects of rubble pile shape changes upon the transport to the side walls.