Effects of coal-fired flue gas composition on condensational growth by water vapor for fine SiO2 particles.

The effects of main components of coal-fired flue gas after desulfurization on the supersaturated environment achievement and condensational growth for SiO 2 particles by water vapor were analyzed. The predicted results demonstrate that the variation of CO 2 content has the greatest impact on the heat and mass transfer in the flue gas. Moreover, it is unfavorable for heat and mass transfer when the CO 2 content increased. Thus, the improvement of CO 2 content has great advantage of achieving supersaturated environment by the method of heating the gas flow. Similarly, the component of SO 2 also has the negative influence on the heat and mass transfer when its content increased. For the improvement of O 2 content, it is slightly beneficial for the thermal and mass diffusion coefficient of water vapor. Additionally, the process of thermal diffusion will be weakened while the mass diffusion will be facilitated when the amount of water vapor enhanced. Meanwhile, the experimental results indicate that particle growth is significantly improved with the increase of CO 2 content by the supersaturation achieving method of heating gas flow. Nevertheless, it has slightly negative effect on the particle enlargement by cooling the gas flow when the CO 2 content promoted. It can be seen that the influence of coal-fired flue gas composition on the condensational growth by water vapor is different by different supersaturation achieving methods. [ABSTRACT FROM AUTHOR]