The production of synthetic or substitute natural gas (SNG) from coal is a process of interest in Colombia where the reserves-toproduction\nratio (R/P) for natural gas is expected to be between 7 and 10 years, while the R/P for coal is forecasted to be around\n90 years. In this work, the process to produce SNG by means of coal-entrained flow gasifiers is modeled under thermochemical\nequilibriumwith the Gibbs free energy approach.Themodel was developed using a complete and comprehensiveAspen Plusmodel.\nTwo typical technologies used in entrained flow gasifiers such as coal dry and coal slurry are modeled and simulated. Emphasis\nis put on interactions between the fuel feeding technology and selected energy output parameters of coal-SNG process, that is,\nenergy efficiencies, power, and SNG quality. It was found that coal rank does not significantly affect energy indicators such as cold\ngas, process, and global efficiencies. However, feeding technology clearly has an effect on the process due to the gasifying agent.\nSimulations results are compared against available technical data with good accuracy.Thus, the proposed model is considered as a\nversatile and useful computational tool to study and optimize the coal to SNG process.
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