The causes leading to slagging in 300 MW boiler of one power plant have been analysed

the conclusion obtained is as follows:although the air-distributing plates of low fluid drag have the ability to distribute the air more uniformly

but their disturbance-resistant ability is weaker

in the case of encountering disturbance the normal fluidization regime is easily to deteriorate

thereby

resulting in slagging due to the bed material sticked on the water-cooled wall.At the same time

it has been pointed out that the designed feed points in the bed material adding system of boiler are imperfect

leading to un-uniform distribution of bed material particles in the furnace

being another cause resulting in bad fluidization.For this

some measures have been put forward

i.e.the parameters in start-up and operation have to be strictly controlled

the quantity of primary air has to be suitably increased

thus

can aviod slagging in a certain degree.