Indonesia coal drying system research

Indonesia is one of largest thermal coal producers worldwide and about 60% of the country’s coal consists of subbituminous coal, which contains less than 6 000 kcal/kg. This type of coal generally has a very low ash content but a very high moisture content. Some of Indonesia’s coal can contain up to 50% moisture, which significantly reduces its combustibility. 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 drying tested on the Indonesian coal, using centrifuges and direct heat blowing, to assess which worked best to improve the coal’s CV. The tests found that using the heat drying method, t the feeder dryer plant dries the coal using heated air that is generated in the burner and is fed by a blower while being transported. Fine coal is extracted from the feeder dryer system and fed into the burner for heat generation to significantly reduce the power requirements. Therefore, the plant currently uses a combination of diesel and pulverised coal to generate the heat to dry the coal, which will see the company save significantly on fuel expenses.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.

Therefore, using lignite coal rotary drum dryer to dry indonesian coal is necessary for the factories to create more economic value, if interested, please
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