Along with putting large-scale utility boilers burning lignite coal into operation in china

the selection of firing mode

the whole layout of equipments

the thermal strength in furnace volume and on cross-section of furnace

the thermal strength on wall surface in burners zone

as well as the selection of coal pulverizing system etc.have been fully studied and analysed.Analysis shows that the key points for large-scale boiler burning lignite coal are preventing slagging and fouling

adopting larger furnace

making the furnace having lower thermal load

and using medium speed mill or fan mill in the coal pulverizing system.The technical features and development tendency of boilers burning lignite coal at present have been summarized up

providing reference for type-selection of newly constructed boiler equipment.