Research Information System
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION, vol.41, no.4, pp.248-262, 2021 (SCI-Expanded)
This study shows the performance of a currently running vertical roller coal mill (VRM) in an existing coal-fired power plant. In a power plant, the coal mill is the critical equipment, whose effectiveness impacts the overall power plant efficiency. Uniform coal feeding mass flow rate and required particle size and temperature at the outlet channel throughout with better classifier performance are crucial indicators that characterize the coal mill performance. To understand the performance of a vertical roller coal mill, the real operational tests have been performed considering three different coal sources. Obtained results indicate that grinding pressure, primary air (PA) temperature and mill motor current have a tendency to rise by increasing coal feeding mass flow rates for all used coal. Moreover, coal volatile matter and moisture content are improved by increasing the mill outlet temperature for each coal type. Additionally, effect of enhancement of the classifier speed has been found favorable on the combustion performance indicators. CMC coal shows relatively better performance since it has lower moisture content and higher hard grove index. Ultimately, the energetic efficiency of coal mill has been investigated and performance value has been found to be a maximum value of 96.2%.