Numerical simulation on variations of solid particles concentration in a six-cyclone supercritical circulating fluidized bed(CFB)boiler furnace with interrupting circulating loop was carried out

by using the Eulerian two-fluid model and the Gidaspow drag model.The results indicate that

before the circulating loop is interrupted

the axial solid concentration profile along the furnace height direction exhibits an approximate " S" type curve.With the interruption in one loop or two loops at different sides

the average solid concentration tends to be equilibrium with a fluctuant decrease.With the interruption in two loops at the same side

the average solid concentration tends to be equilibrium with a straight decrease.The variations of average solid concentration at different sides of the furnace have a similar law

but differs by half period.In addition

the fluctuation period with interruption in two loops at the same side is significantly longer than that with interruption in two loops at different sides.