Coal represents about 70% of the world's proven fossil fuel reserves and it has the lowest cost among the different fossil fuels [1]. However, energy production based on coal is characterized by significantly high pollutant emissions, especially CO. Thus, the perspective of coal as energy source is based on the success of the emerging "clean coal technologies." On the other hand, biomass is an abundant and carbon-neutral renewable energy resource. The option of biomass as a stand-alone source of fuel production is not yet feasible, because sustainably-recovered biomass is expensive and the size of the biomass to energy facilities would be limited by the quantities of biomass that can be gathered in a single location which in turn would deteriorate the overall process efficiency. However, the addition of biomass in coal gasification plants as a way to control and reduce the overall greenhouse gas emission (GHG) has the potential to become a very promising alternative. Two important factors that are critical on the utilization of biomass as an energy source is the type (e.g. wood biomass, agricultural waste, food scraps etc.) and the percentage addition of biomass to be processed.
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