Self-Heating of Coal and Char: A Literature Review

摘要

This study summarizes the literature on coal and char self-heating. Emphasis is placed on understanding the fundamental processes involved and the methods for predicting the occurrence and extent of self-heating. The best method for modeling self-heating is found to be that typically used for heterogeneous chemical reactors; i.e., numerical integration of the differential heat and mass balances to get temperature and concentration profiles. Thus, the problem is broken down into the basic components of reaction kinetics, mass and heat transfer, and the solution of the continuity and energy equations. Experimental procedures for measuring the reaction and transport properties are described, along with typical values for these parameters. The fundamental models developed to date predict that theire are two possible stationary states for coal and char piles. (ERA citation 07:049073)