Partial slagging coal gasifier operational performance and product characteristics for energy sustainability in an integrated gasification combined cycle system

Operational performance of two ton/day coal partial slagging entrained-bed gasifier has been investigated. Coal to syngas conversion under operating temperature (1100-1300 °C), pressure (19.7-20.4 bar) and oxygen to coal ratio of 0.70 produced syngas at a flow rate of 177.5 Nm3/h. Composition of produced syngas was; CO 38-40 vol%, H2 22-23 vol%, CO2 7-8 vol%, and CH4 1.0-1.5 vol%. Carbon conversion and cold gas efficiency after one pass through operation were found to be 92.81% and 73.83% respectively. Fly ash fines produced were high in carbon content and acidic oxides than the bottom slag. Non-metal leaching nature of bottom slag was confirmed with ICP analysis. Based on the results, an industrial symbiosis can be established by recycling and reusing high carbon content fly ash fines in the gasifier. The same can be sold to other industries as a quality energy fuel. Slag produced can be used for the construction of roads and pavements.