Numerical simulation on particle deposition in flue gas flowing
across spirally corrugated tubes in aligned arrangement
1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Energy and Environment, Southeast University, Nanjing， Jiangsu 210096, China
Abstract：To investigate the particle deposition in flue gas on the surface of spirally corrugated tubes, the numerical simulation was carried out by discrete phase model and userdefined function of particles deposition model to predict gassolid two phase flow across spirally corrugated tubes. The particle deposition rate and the difference between bare tubes and spirally corrugated tubes were analyzed and discussed. The effects of gassolid two phase flow parameters and tube bundles configuration on the particle deposition rate were also investigated. The results show that compared to the bare tubes， the deposition rate for spirally corrugated tubes is decreased by about 5% when the gas flow velocity is in the range from 7 to 10 m·s-1. However, when the flue gas flow velocity is beyond 10 m·s-1, there is no obvious difference between spirally corrugated tubes and bare tubes. The deposition rate is increased with the increasing of particle diameter and particle concentration in flue gas. The deposition rate is proportional to longitudinal space and inversely proportional to transverse space, pitch and groove depth. The effects of transverse space and pitch on the particles deposition rate are more obvious than that of groove depth.
2018, Vol. 39 
