Add Time : 2020-04-30

Indonesia coal generally has a very low ash content but a very high moisture content, some of which can contain up to 50% moisture, which significantly reduces its combustibility. In fact, the profitability of a power plant is driven by the quality of the coal that is fed into the plant, as it affects the power output, operating and maintenance cost as well as waste disposal costs. Therefore, it is crucial that the coal’s moisture levels be reduced, as this will increase the calorific value (CV) and decrease shipping costs, owing to the reduction in the weight of the coal.
As the drying test shown, by using the heat drying method, the coal’s CV increased by about 30% after 180 seconds exposure to hot air at 60 °C, with a weight loss of up to 6%, owing to moisture reduction.
The lignite coal drying plant will reduce the coal’s moisture level by about 20%, thereby providing for a 1 000 kcal/kg increase in the coal’s heating value. This will create an additional profit of $10/t on the coal for the Indonesian coal miner.