Deposition of Cement Kiln Ash on the Tubes of Waste Heat Recovery Boiler

Deposition of cement kiln ash on the tubes of heat recovery boiler affects the heat exchange efficiency. The basic characteristic of cement kiln ash and the deposition on the tubes with different arrangements are presented. Numerical simulation and experiment measurement show that flow field feature, especially the low-velocity zone and vortex street, causes different shape of ash deposit around the tube. The effect of ash concentration, tube arrangement and gas velocity on the deposition is analyzed. The effect of the tube diameter and the gas composition is also discussed.