Taking boiler No.32 in Luohuang Power Plant as an object for study

numberic simulation concerning twophase flow field of burners and combustion process in the furnace has been performed by using CFXTASC flow software. Firstly

based on relationship between the ignition temperature of Songzao anthracite and the density of its coalpowder measured in testing

a device for separating rich and lean coalpowder of the burners has been designed under optimization. On the basis of determining retrofit scheme of a single burner

a combustion scheme with rich and lean coalpowder for the entire furnace having "mutiple centres of stable combustion" has been suggested. And finally

the effectiveness and feasibility of the said scheme have been verified through numeric simulation.