Study on the Combustion and Kinetic Characteristics of Pulverized Coal in Low-pressure Environment

Abstract

Combustion characteristics of two Chinese pulverized coals have been investigated using TG/DTG/DSC in the low-pressure environment. The changes of combustion characteristic parameters of pulverized coals under the different lowpressure environment are analyzed and the kinetic parameters of pulverized coals of each condition are calculated. In the low-pressure environment, a series of characteristic parameters such as ignition temperature, burnout temperature, the temperature corresponding to maximum burning rate, DTG max , combustion characteristics index S, the combustion characteristics of the experiments coal was researched. Also the thermal analysis kinetics (Coats-Redfern) method were investigated on the activation energy in three different absolute pressures (80kPa, 70kPa, 60kPa) to reveal the effects of the pressures on coal combustion. The results indicate that: when the pressure decreased, the T V , T m , T h increased, and simultaneously the activation energy (E) increased, the combustion characteristics became much bad, indicated that need more energy from external.