Aiming at obtaining the combustion characteristics of lignite semi-coke

this paper takes the Wulagai lignite semi-coke pyrolyzed at low temperature as the research object to carry out experiments on selfignition test bench built in Xi'an Thermal Power Research Institute.The evaluation system and test methods for coal property indexes were applied.The experimental results show that

the Wulagai lignite semicoke was a kind of coal with low moisture

low volatility and high calorific value

and it was easy to be ignited and burned out

its combustion stability was excellent and this was close to domestic typical bituminous coal.The Wulagai lignite needs no more consideration of using stable-combustion measures.The ash fusion point of Wulagai lignite semi-coke was low and the slagging tendency was serious

so slagging prevention was a question of primary concern in the design of boiler.In order to prevent serious slagging and dust stratification on the convection heating surface at the tail of the boiler

the furnace outlet gas temperature should be lower than 1 000 ℃

and the blowing should be strengthen during the boiler operation.The1 000 MW new boiler unit should use low oxygen combustion technology and strict staged air distribution to achieve low NOxemissions.This results could provide reference for domestic new boiler equipment selection.