Dynamic modeling and control of coal-slurry membrane wall entrained flow gasifier

The sturdy of slag flow behavior and its control method is of significance for the development of membrane wall entrained flow gasification technology. This paper established a dynamic gasifier model for an oxygen-staged membrane wall gasifier, using reactor network modeling concept. The model can not only predict gasifier outlet parameters, but also provide a reasonable temperature distribution inside the gasifier, which benefits the slag flow calculation. After analyzing the dynamic characteristics of the gasifier using the model, we proposed a preliminary control strategy for temperature and slag thickness control, and carried out some control simulations under coal property disturbances. The results showed that the control system could adjust the top and bottom slag thickness to reasonable values when they exceeded safe ranges. The manipulation of secondary oxygen ratio could enhance the control ability on the top slag thickness control.