variavel0=<b>Valdeci José Costa</b> - vcosta@iscc.com.br UNIPLAC
<b>Viktor G. Kriukov</b> - kriukov@unijui.tche.br UNIJUÍ
<b>Clóvis R. Maliska</b> - maliska@sinmec.ufsc.br UFSC
<b>Abstract.</b> The one-dimensional model of pulverized coal combustion presented in previous works it was enlarged in way to consider the processes of sulfur capture by limestone. In the new version of model besides: combustion in the gaseous phase; drying of particles; devolatilization; heterogeneous combustion of char; residues emission; mass and energy transfer between gaseous and solid phases – the model considers: water injection with the aim of reducing the temperature of the gaseous ambient and assistant in the sulfur capture by CaCO3; limestone’s calcination; sulfation and reduction of CaSO4. The model was validated for calcination and sulfation. The numeric simulations were made for bituminous coal, modifying: coordinate of the point of water injection, the amount of water injected and BET surface area of limestone. The model detected the presence of great amounts of the H2SO species, fact still not found in available literature. A quick reduction was established in the sulfation limits proposed by other authors. The sulfur capture is favored with the displacement of the point of water injection and with the increasing of the BET surface. However, for each injection point, we have a superior limit for capture rate h, which is established by the chemical equilibrium conditions.
<b>Keywords.</b> Pulverized coal combustion, modeling, limestone, sulfur.