Based on the computational particle fluid dynamics(CPFD) numerical simulation method

the study takes the 660 MW supercritical circulating fluidized bed(CFB) boiler in Pingshuo

Shanxi as the research object. A full-loop model of the furnace is established and numerically simulated. On the basis of the parameters of the actual furnace

the material distribution characteristics of six cyclone separators are investigated. By altering the ratio of primary to secondary air

the uniformity of primary air

and the uniformity of secondary air

the effect of operational parameter changes on the gas-solid flow field within the furnace and the material distribution at the cyclone separator inlets is analyzed. The results indicate that the distribution characteristics of particles within the furnace lead to a distribution feature of particle mass flow rate at the cyclone separator inlets

which is “high on both sides and low in the middle”. When the total air volume is constant

a larger ratio of primary to secondary air can reduce the deviation in particle mass flow rate at the cyclone separator inlets. The uniformity of air distribution for both primary and secondary air in the furnace also affects the particle mass flow rate distribution at the cyclone separator inlets. The deviations in particle mass flow rate at the inlets of the six cyclone separators reach their minimum when the wind speed deviation at the middle air distribution plate is 10% and the deviation in the middle secondary air volume is 5%

respectively.