Prediction of Pulverized Coal Combustion Behavior around Tuyere by Using LES and Extended CPD Model

Abstract

Influence of pulverized coal into the blast furnace is an invaluable technology for reducing ironmaking costs. In order to increase the rate of pulverized coal injection, it is necessary to investigate the combustion behavior of pulverized coal around the tuyere, and many numerical simulations as well as experimental studies have examined this issue. In this paper, the combustion behavior of individual pulverized coal particles was investigated by using the Extended CPD model, which is a new devolatilization model, and the Large Eddy Simulation (LES) model. The volume fraction of CO+CO₂, which is the indicator of how much carbon included in pulverized coal is changed to the gas phase, was reasonably predicted by the new simulation model. The results of this study suggested that the devolatilization processes of pulverized coals with sizes under 40 µm varies widely between individual particles.

N₂ volume fraction distribution and particle distribution with particle diameter.