CO_(2)体积分数对燃煤细颗粒物在水汽环境中凝结长大的影响

Effect of CO_(2) Concentration on the Nucleation and Growth of Fine Coal-fired Particles by Heterogeneous Condensation of Water Vapor

为研究燃煤烟气中CO_(2)体积分数对细颗粒物在水汽环境中凝结长大效果的影响,建立了计算模型并搭建了实验平台,分别从理论计算和实验研究两方面探讨了CO_(2)体积分数对细颗粒物凝结长大效果的影响。结果表明:随着CO_(2)体积分数升高,混合烟气的热、质扩散系数均降低,生长管内平均过饱和度增加,细颗粒物长大效果明显;管壁温度越高,随着CO_(2)体积分数的提高,细颗粒物粒径越大。

To study the effects of CO_(2) concentration on the nucleation and growth of fine coal-fired particles by heterogeneous condensation of water vapor,mathematical models were established and an experimental platform was built,so as to theoretically and experimentally analyze the effects of CO_(2) concentration on the nucleation and growth of fine particles in the condensation chamber.Results show that with the increase of CO_(2) concentration,the thermal/mass diffusion coefficients of the mixed flue gas decrease,while the average supersaturation in the growth tube increases,with obvious growth of fine particles.The higher the wall temperature is,the larger the size of fine particles will be,with the increase of CO_(2) concentration.