Effect of in-Situ Heat Treatment on Coal Char Reactivity. Engineering Kinetics of Coal Pyrolysis and Combustion in Normal and High Intensity Flames. Progress Report

摘要

The objective is to determine whether char reactivity can be significantly reduced by millisecond heat treatment times. Data evaluation has required development of additional activities, focussing on engineering kinetic requirements for evaluation modelling, as described following. The hypothesis for test in these experiments is that the very high heating rates involved in this system (about E6 deg/sec) is substantially eliminating in-situ heat treatment of the flame-formed char that would otherwise reduce the char reactivity to a ''normal'' value. To test this hypothesis secondary air is being supplied in these experiments some variable distance below the primary zone to permit heat-treatment of the flame-formed before burn-out. The complexity of the behavior of the experimental system, however, requires determination of the kinetic rate constants by comparison with flame models; and because of some complex backmix behavior in the flame, a further requirement of the modelling is representation of the kinetics in a form that is computer-tractable in the flame model but will yet yield results of a ''necessary and sufficient'' accuracy. (ERA citation 11:010908)