Abstract:
Mathematical model of entrained flow gasifier is the foundation of the gasification plant design and the operation optimization. The residence time distributions (RTD) of gas and particles are the key factors of the gasifier, which have significant effects on the syngas composition and carbon conversion. In this study, a general network model (GNM) was established based on the RTD of gas and particles and the detailed reaction kinetics. The simulation results agree well with the industrial data. The effects of oxygen coal ratio (ratio of oxygen volume to coal (dry basis mass)) on gasification performance were investigated for Shenfu coal. The simulation results indicate that the best theoretical oxygen coal ratio is approximate 0.655 Nm3/kg. To ensure discharging slags in liquid, the optimal oxygen coal ratio in operation should be controlled in a value around 0.663 Nm3/kg. The GNM can get result in acceptable computing time, which is suitable for the dynamic modeling.