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

Abstract

Pulverized coal injection into blast furnace is the precious technology to decrease the iron making cost. To inject more pulverized coal, it is necessary to investigate the combustion behavior of pulverized coal around the tuyere and many numerical simulations as well as experiments have been carried out. In this paper, by using Extended CPD model which is new devolatilization model and Large Eddy Simulation model, the combustion behavior of individual pulverized coal particles was investigated. The volume fraction of CO+CO₂ which is the indicator of how much carbon included in pulverized coal changed to gas phase was reasonably predicted by new simulation model. It is suggested the devolatilization processes of pulverized coals under 40 µm varied widely between individual particles.

N₂ volume fraction distribution and particle distribution with particle diameters.