Numerical simulation of elimination of white smoke in coal-fired power plants with WFGD system

Abstract

White smoke discharged from chimney in coal-fired power plants always includes residual sulfide which can cause corrosive damage to buildings and environment around. In most coal-fired power plants, there are three major measures to eliminate white smoke: direct heating, condensing and heating, mixing with dry flue gas at high temperature. Main studies on white smoke elimination treat diffusion process as simple mixing of smoke and atmosphere, which has large deviation from reality. By 3D-modeling and numerical simulation, accurate data of white smoke elimination process is obtained. Simulation results indicate that humidity and temperature of atmosphere as well as smoke gas temperature are influential factors to the formation of white smoke. A fitting formula of atmosphere temperature, smoke gas discharge temperature and humidity has analyzed from simulation results, which provides exact data reference for practical white smoke elimination in coal-fired power plants.