Numerical Analysis of Growth of Coal-fired Particles Promoted by Condensation of Water Vapour in Oversaturated Environment
2020
Ju Gao, Ting-fang Yu†, Lin Wang and Run-guo Chen
A kinetics model was established to investigate the effects of condensation of water vapour on the growth of coal-fired particles. The effects of operating parameters on particle growth were numerically studied, including growth time, supersaturation, flue gas temperature, and particle number concentration. The results showed that almost all the particles could grow rapidly more than 2.7 microns in tens of milliseconds. When initial supersaturation is constant, the higher the temperature of flue gas, the larger the amount of condensable vapour and the final diameter of particles. Moreover, when the gas temperature is constant, the higher the degree of saturation, the larger the driving force for vapour condensation and the particle size distribution becomes narrower. Additionally, with the increase of particle number concentration, the competition between particles for water vapours become more intense, and the final diameter for particles are smaller.
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