The designed coal sort for tangential firing boiler of 600 MW units in one power plant was Jinbei bituminous coal

but the mixedly burning lignite is more easily ignited and burnout

however

it is easily resulting in slagging and severe fouling in the boiler

and the total water content of lignite is comparatively high.These properties of said lignite propose special requirments for the coal-pulverizing system and the combustion mode of boiler.For this

analysis of mixedly burning lignite technology has been carried out.When the proportioning ratio of lignite and Pingliu coal is 1:1

the change of burnout degree isn't large

the amplitude of temperature rise concerning discharged flue gas is smaller

the change of slagging on boiler's water-wall and big panell isn't remarkable

but the corrosion of air preheater has been alleviated.