The solid particle concentration in furnace of the CFB boiler has great influence on water wall heat transfer

furnace temperature distribution and heating surface abrasion.Measuring holes were set on water walls of a subcritical 330 MW unit CFB boiler.A drawer-style device is used to detect the local particle concentration in the furnace

thus to investigate the horizontal distribution of particle concentration near the water wall.The results show that

within a 1mradius to the water wall

the particle concentration decreases with the increasing distance to the water wall

and the particle concentration remains stable in the core region at the same height.The higher the measuring holes

the lower the particle concentration.A rise in the superficial gas velocity increases the particle concentration in the upper section of furnace.A correlate equation of the horizontal distribution of particle concentration near the water wall is fitted with the experimental results.The calculation error of this equation is less than 20%.