Thermodynamic modelling and evaluation of a two-stage thermal process for waste gasification

► This paper compares single and multiple stages gasification technologies. ► A model is developed to predict efficiency and gas composition at each stage. ► The model is validated with experimental data taken from a demonstration plant. ► Carbon conversion and syngas yield are enhanced when using a two-stage process. ► Optimal oxidants ratio and energy demand depend on the aims of different projects.