Multi-fluid modelling of the desulphurisation process within a bubbling fluidised bed coal gasifier

Abstract

The present work introduces the desulphurisation process to a two- and three-dimensional Eulerian-Eulerian CFD model of a coal bubbling fluidised gasifier. The desulphurisation process is important for the reduction of harmful SOx emissions, therefore the development of a CFD model capable of predicting chemical reactions involving desulphurisation is key to the optimisation of reactor designs and operating conditions. To model the process, one gaseous phase and five particulate phases are included. Devolatilisation, heterogeneous and homogeneous chemical reactions as well as calcination and desulphurisation reactions are incorporated. A calcination-only model and a calcination plus desulphurisation model are simulated in two and three dimensions and the concentrations of SO2 leaving the reactors are compared. The simulated results are assessed against available published experimental data. The influence of the fluidised bed on the desulphurisation is also considered.

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