A numerical study of pulverised coal combustion under Moderate or Intense Low oxygen Dilution (MILD) combustion conditions was carried out in a parallel jet self-recuperative MILD combustion furnace. The three-dimensional model solved the Reynolds-Averaged Navier-Stokes equations and used the Eddy Dissipation Concept (EDC) model to describe the turbulence-chemistry interaction. The main aim of this work is to investigate the MILD combustion characteristics of pulverised Kingston brown coal using N2 as a carrier gas in the furnace. The modelling results are validated using our experimental measurements. The characteristics of thermal-NO, prompt-NO, fuel-NO, and NO-reburning mechanisms and the influence of heterogeneous reactions on char burnout rate for the MILD combustion of pulverised coal are presented and discussed. The Results reveal that the sum of contributions from the thermal-NO and prompt-NO routes only accounts for less than 3.7% to the total NO emissions, whilst the fuel-NO route dominates the NO emissions under the MILD combustion conditions.
|Original language||English (US)|
|Title of host publication||ASPACC 2015 - 10th Asia-Pacific Conference on Combustion|
|State||Published - Jan 1 2015|