| Abstrak | A study on a mine mouth coal fired power plant has been done and showed that a 2x6 MW electricity output coal fired power plant is feasible to be installed when it uses rejected coal. The rejected coal mostly contains high sulfur (~3% dry basis), and has low calorific value (4700 Kcal/kg). From an environmental point of view, the SO2 emission from the combustion of high sulfur containing coal has to be controlled in order to comply with the government regulation. Besides, ash content of the coal which produces the particulates need to be captured by cyclones to have particle concentration below the standard. This paper calculates the particulate and SO2 emissions and estimates the the size and number of cyclones used as well as the amount of lime slurry utilized in the in Flue Gas Desulfurization using a spray-dry scrubber type. Utilizing a 4.7% ash content and a 3% sulfur content of coal as a fuel, the prediction of particulate and SO2 emission are about 570 mg/m3 and 2580 mg/m3, respectively. In order to meet the respective particulate and SO2 emission standards of 150 and 750 mg/m3, it could employ a 4-conventional type cyclones with a 0.5 m2 each of inlet area having around 80% efficiency, and a SO2 control device of spray-dry scrubber type with a capture efficiency of at least 75%. The scrubber has to utilize lime between 376 and 504 kg Ca(OH)2/ hour, with continuous addition between 23% and 30%, and re-cycled between 77% and 70% of it. |
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