Simulation of the FGD In-Duct Injection Technology using complex kinetic models

摘要

The aim of this work is the computer aided simulation of an entrained flow reactor operating under typical conditions of FGD in-duct injection at low temperatures. The modelling was performed considering the gas-solid reaction in a single particle of sorbent that is moving as well as the gas phase at any axial distance of the duct. The overall reaction rate is calculated from the transport resistance through the ash layer and the chemical reaction taking place at a sharp moving interface in the radial axis of the particle. The experimental profiles of the SO_2 concentration in the external gas phase obtained in a pilot plant of In-Duct-Injection of Ca(OH)_2 were introduced to the simulation in order to estimate the parameters of the reaction under study, working at different Calcium/Sulfur molar ratios. The proposed model allows to describe the SO_2 removal and the solid conversion levels when varying the residence time in the duct, in good agreement with the experimental values.