低低温工况下颗粒凝并机理分析及研究方法初探

摘要

Low‐low temperature electrostatic precipitator (ESP) can effectively improve particle coagulation . On the basis of literature research and related research ,this paper analyzes the mechanism of particle coagula‐tion under low‐low temperature working condition and gives a combined research methods between theoretical calculation and experimental observation .The method simulates turbulent flow field by 2d‐LES model;calcu‐lates particle trajectories in the flue gas cooler by discrete phase model (DPM );introduces particle group bal‐ance model (PBM ) by Euler double fluid method ;introduces kernel function of particle turbulence coagulation , heat coagulation and humidification coagulation and calculates particle coagulation by w riting the user self‐de‐fined function (UDF) .It is pointed that the optical method causes small interference to particle coagulation and crushing effect ,proved an effective detection method for laboratory observation of particle coagulation mecha‐nism .%低低温电除尘器可有效提高颗粒凝并，在文献调研及相关研究的基础上，对低低温工况条件下颗粒凝并的机理进行了分析，给出了一种理论计算与实验观测相结合的研究方法。该方法利用2d‐LES模型模拟湍流流场，利用离散相模型（DPM ）计算烟气冷却器中颗粒运动轨迹，利用欧拉双流体方法，引入颗粒群平衡计算模型（PBM ），并通过编写用户自定义函数（UDF）引入颗粒湍流凝并、热凝并和增湿凝并核函数，计算颗粒凝并；指出光学法对颗粒凝并、破碎效果干扰较小，可以作为实验室观测颗粒凝并机理的有效检测手段。