Comparison study on three turbulence-chemistry interaction models in numerical simulation of coal gasification

In order to obtain the applicability and accuracy of commonly used turbulence-chemistry interaction models in the numerical simulation of coal gasification, a numerical simulation was performed using three turbulence-chemistry interaction models, and the temperature field, concentration field and carbon conversion distributions were analyzed and compared with experimental data. The results show that the turbulence-chemistry interaction model has great influence on the temperature and concentration field at the flame zone, while it has little influence on the lower part of the gasifier; the EDM model presents a large prediction error for the concentration distribution of gas compositions; the PDF model based on single mixture fraction gives unreasonable temperature and concentration field near the nozzle outlet, while it gives accurate results at the gasifier outlet; the EDC model gives satisfactory predictions except for overestimating the flame temperature, it is noted that considering elementary reactions and detailed chemical reaction mechanism can further improve the accuracy of predicting the flame temperature.