International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 95), İstanbul, Turkey, 11 - 14 July 1995, pp.640-645
A combined approach involving physical cleaning of coal followed by semicoking and the recovery of volatiles from the released gases is investigated. It is shown that semicoking of a lignite sample at moderate temperatures of 500-700 degrees C is capable of increasing the calorific value of coal. In addition, semicoking of lignite is found to reduce the sulfur content of the coal considerably. Calculations based on the energy efficiencies for semicoked sample and volatile gases indicate that the semicoking process is a plausible alternative for the utilization of low-rank coals and for the environmental control of sulfur dioxide emission.