665 / 2019-04-27 17:19:17

Co-firing characteristics and kinetic analysis of distillers’ grains/coal for power plant

Distillers’ grains; Bituminous coal; Co-firing; Thermo-gravimetric analysis; Kinetic analysis.

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The combustion of a biomass with coal may be one of most effective methods to improve energy utilisation efficiency. This study aims to investigate the combustion characteristics of distillers’ grains with bituminous coal using a thermo-gravimetric analyser. The results demonstrate that increasing the proportion of distillers’ grains in coal results in a reduced ignition temperature (Ti) and burnout temperature (Tb), and activation energy (E) in the combustion stage. Therefore, the comprehensive combustion index (CCI) improves. In an O2/CO2 atmosphere, Ti increased by approximately 15 °C, while Tb did not change much. However, E and CCI declined relative to an O2/N2 atmosphere. Under the O2/CO2atmosphere, with an increase in O2 concentration from 10% to 40%, Ti changed over a small range, but Tb declined from 745.8 °C to 641.4 °C, while E and CCI improved. As the heating rate rose from 10 °C/min to 30 °C/min, the values of Ti decreased (from 281.4 °C to 244.9 °C), but the values of Tb increased significantly (from 662.8 °C to 745.8 °C); the value of E reduced, and CCI also improved. This research could provide useful information as a practical reference for heat and power production.