Abstract: A three-dimensional numerical simulation of the temperature field and particle motion of a 330 MW quadrangular cut-circle combustion boiler burning Zhundong coal is carried out by using the vertical dense combustion technology, a particle deposition model of the heating surface is established, and the slagging characteristics of the pulverized coal furnace are analyzed under various vertical dense-dense distribution ratios. The simulation results show that the particle deposition rate predicted by the particle fusion model is slightly lower than that predicted by the particle viscosity model, but in the same order of magnitude, indicating that the particle fusion model is suitable for predicting the slagging characteristics of coal-fired quasi-eastern coal boilers. The vertical concentration ratio of pulverized coal has an important effect on the location of coking in the furnace, and when its value increases, the reduction occurs in the region of the furnace chamber where the temperature is higher than 1900 K. The screen superheater slagging can be greatly reduced, but the front and rear water-cooled wall slagging increases, which leads to a more uniform distribution of slagging in the furnace.