Through numerical simulation software Fluent

and taking the N-S equation and the RNG k-ε model as basis

using Lagrangian particle trajectory model

the numerical simulation of flow field in centrifugal induced draft(ID) fan and the running track of solid particles in the fan has been carried out

the phenomena of back flow and boundary layer separation existing on suction surface at entrance of the impeller being discovered

easily leading to deposition of solid particles.The internal flow field and the running track of solid particles in the fan after adding air flow for soot-blowing have been numerically simulated.In the event of adding air flow at suitable angle for blowing

the flow field in the vortex zone on suction surface of ID fan may be changed

reducing the deposition of ash particles

even making the deposited ash particles to drop off.The effectiveness of ash cleaning is optimal when putting 4~6 nozzles into service.