In order to grasp the basic law of particles' distribution in furnace of large-scale circulating fluidized bed(CFB) boilers

the density distribution of particles in dilution region of the furnace has been tested and studied on one 465t/h CFB boiler and a cold-state test stand of CFB boiler with a cross section of 0.3×0.3 m2 and a height of 4 m.based on results of test

a simple method describing the axial density of particles in dilution region has been put forward.Under condition of knowing the pressure on two arbitrary points in axial direction or the density distribution of particles at any location in the dilution region

the axial density destribution of particles in the entire dilution region can be obtained.