In order to explore the influence of refractory belt arrangement on stable combustion and slagging of the boiler

this study takes a 300 MW tangentially fired boiler as an example. The refractory belt is divided into two kinds: large pieces and small pieces

according to the characteristics of heat load distribution curve of furnace water wall. Because the area of refractory belt is inversely proportional to the size of the heat load of water wall in the pulverized coal ignition region

the refractory belt is arranged on the water wall near to the next group of pulverized coal burner

which not only promotes the ignition and stable combustion of pulverized coal

but also avoids the slagging on the refractory belt. Through numerical simulation and combustion tests of three schemes of refractory belt arrangement

the results show that

arranging the refractory belt according to the characteristics of heat load distribution of water wall

appropriately reducing the arrangement of the refractory belt in the high load zone and increasing the arrangement of the refractory belt in the low load zone(back-fire side of the burner exit)

can effectively reduce the risk of slagging

ensure the stable combustion of the boiler

and improve the thermal efficiency of the boiler.