INDONESIA including countries with the largest source of coal mines in the world. Estimated 36.3 billion tons of reserves. Only 50-85 percent of low quality. This is seen from the combustion of low calorific value and sulfur content and the water is high. Therefore, lignite coal is also known as lignite or brown coal is not economically used as fuel. When this energy source was taken to a location remote from the mine, then the cost of transportation becomes expensive. Because the actual freight charges incurred to bring water and ash which will be discarded in the process of coal utilization. Lately, with the abolition of fuel subsidies (fuel oil) that catapulted the price of fuel in Indonesia, coal starts to peep. In calculating Firdaus Akmal, president director of PT Indonesia Power, the fuel was cheaper than gasoline. When using diesel or Diesel Power Plant (PLTD), electricity prices reach Rp 500 per kWh. With coal, generating cost only about USD 50 per kWH. Will thereby save the cost of approximately Rp 30 billion per year. However, to use coal-in this case lignite as fuel for power-specific approach is necessary, factor the problem because there are constraints, ie the water content and high sulfur.
Opinion :
In my opinion, of coal when burned a lot of wasted energy to evaporate water, while the value obtained by the relatively low calorie. In addition, high sulfur content which would be a pollutant gas. Therefore required additional costs to reduce emissions of sulfur gas. The solution taken is to build a power plant installations near the coal mining area, so the transportation cost is minimal. It also developed technical lignite combustion process that can reduce sulfur gases into the air so that contamination of this gas can be suppressed.
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