Comprehensive Simulator Applied to Fluidized Bed Coal Gasification

Abstract

A comprehensive simulator of fluidized bed equipment (CSFMB) has been able to reproduce experimental tests of bituminous coal gasification. The tests employed a bubbling fluidized bed pilot operating at atmospheric pressure and mixtures of air and steam were injected as gasification agents. Relatively low deviations between experimental and simulation results have been achieved. The simulator can now be applied on optimized scaling up of that equipment operating at any pressure. It also opens the possibility of integrating CSFMB as a module of wider simulations aiming optimizations of CIG/GT (Coal Integrated Gasification/Gas Turbine process) and Fisher-Tropsch processes.

The effect of particle polydispersion in a gasifier bed dynamics using Eulerian-Eulerian models

“…The chemical kinetics of the reactions involved in coal gasification are not well established, and some calibration of the kinetic parameters could provide a better agreement. For example, de Souza-Santos [20] reported that taking into account the effect of poisoning substances on the kinetic parameters of the water-gas shift reaction leads to drastically reduced deviations in the concentrations of H 2 and CO predicted with his one-dimensional model. Nevertheless, the main objective of the present article is the investigation of the influence of coal polydispersion on the gasifier performance; and the main qualitative conclusions, such as the delay in oxygen consumption by char oxidation or the uneven composition of the gas produced, would remain valid even if the kinetic parameters were optimized for a better fit of the experimental exit-gas composition.…”