Dynamic Model for an Oxygen-Staged Slagging Entrained Flow Gasifier

A dynamic gasifier model including slag flow behavior simulation was established to simulate a new type of oxygen-staged gasifier recently developed in China. A reactor network model (RNM) is used to simulate the internal gas–solid reaction zone of the gasifier, in which the reactor is divided into several zones based on the understanding of the flow characteristics in the gasifier, with each zone represented by either a plug-flow reactor or a well-stirred reactor. This space division concept can provide a more reasonable temperature distribution prediction than one-dimensional models, without costing too much computational expense. In addition, a widely accepted slag layer model is used to simulate the time-varying slag accumulation and flow on the wall and the heat transfer process through the wall. Using the developed model, two kinds of oxygen-staged gasifiers were simulated: the refractory wall gasifier and the membrane wall gasifier. The RNM predictions were compared with industrial data and computa...