Dynamic simulation of a single-stage entrained flow coal gasifier. Final report

A transient, multidimensional computer model has been developed to simulate the detailed phenomena occurring in the general class of single-stage entrained flow gasification reactors. Application of the computer simulation code has been specifically demonstrated for the Texaco class of gasifiers. The EEF (EPRI Entrained Flow) computer simulation model accounts for the coupled chemistry and turbulent hydrodynamics associated with coal-water slurry and oxygen injection including droplet and coal moisture vaporization, coal pyrolysis, char combustion and gasification, gas phase combustion as well as intraphase and interphase (turbulent) transport of mass, momentum, and energy. A generalized finite element geometry is used in one-dimensional, two-dimensional (Cartesian or axisymmetric), and three-dimensional modes. The theoretical formulation of the model is presented and several calculations of different types described. Three different approximations to the Texaco reactor design have been examined and the resulting similarities/differences discussed. Possible implications for scaleup and gasification-combined cycle operation have been noted.