Multi-physics Modeling of Coal Gasification Processes in a Well-Stirred Reactor with Detailed Gas-phase Chemistry, Devolatilization, and Char Porosity Model

摘要

To theoretically understand the complex chemical processes in a gasifler and to identify the most influential parameters on syngas production, a multi-physics model with detailed chemistry was developed for the first time to simulate the gasification processes in a well-stirred reactor. In an earlier model, the coal particle was assumed to be pure carbon particle without porous structure inside. A revised model is introduced with global devolatilization model and speciated devolatilization model for tar, CH_4, CO, CO_2, H_2O, H_2, and HCN. Random Pore Model (RPM) is used to predict the development of pore surface area during the gasification of coal char. Numerical simulations were conducted to understand the complex gasification process with the involvement of the devolatilization and volatile reactions.