The distributed-energy chain model for rapid coal devolatilization kinetics. Part II: Transient weight loss correlations

✍ Scribed by Stephen Niksa

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 644 KB
• Volume: 66
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(86)90083-0

✦ Synopsis

The Distributed-Energy Chain Model (DISCHA1N) is formulated in a companion paper [1]. In this paper, numerical predictions are compared to the transient weight loss from a bituminous coal in vacuum during heatup and throughout isothermal pyrolysis for two heating rates ( 102, 103K/s) at temperatures between 700 and 1300K. Based on seven independent reaction rate parameters, the model predicts transient yields for unreacted coal, gas, tar, and char. Except during heatup at the lower heating rate, the model correlations are in good quantitative agreement with the measured weight loss, and agree with the observed yield enhancement for greater heating rates within the experimental error.

This study also includes data correlations from the Distributed Activation Energy Model, to identify the most important model parameters, and model predictions from DISCHAIN for typical pulverized coal combustion conditions, to further illustrate the extent that transient devolatilization on short time scales is determined by transient thermal histories.