A techno-economic assessment of syngas production by plasma gasification of municipal solid waste as a substitute gaseous fuel
Abstract The updraft plasma gasification process of different municipal solid wastes (MSW) to produce syngas as substitute gaseous fuel was assessed from a techno-economic viewpoint. The plasma gasification process was modelled under a thermo-chemical approach using Aspen Plus. The model validation has been carried out with experimental data from literature, reaching an average relative error of 6.23%. The plasma torch power consumption was one of the main process parameters that affects the energy and exergy efficiencies. In spite of increasing moisture content of MSW, from 26.61% to 57.9%, the energy and exergy efficiencies expanded by 1.5% and 5.4% on average, respectively, which ascribed to the reduction of torch power consumption; this behavior resulted as the torches thermally degraded a lower fraction of dry MSW. Whereas, if plasma temperature increased (2500°C to 4000°C), the gasification efficiencies diminished because of the torch power consumption boosted by 28.3%. Furthermore, the parameter combinations process (air flow and plasma temperature) was found to reach the highest process efficiency, the efficiency ranged from 79.22% to 83.46%, highlighting the plasma gasification flexibility. The levelized cost of syngas production varied from 15.83 to 26.21 ¢US/kWh. Therefore, to make these projects feasible (waste to energy), a waste disposal charge that must be ranged between 14.67 and 26.82 ¢US/kWh was proposed.