CAJ | 학술논문

利用流体动力学计算方法对湿法脱硫折流板除雾器内气液两相流动进行数值模拟。分析了除雾器叶片间距、板型及流速对不同粒径雾滴的分级除雾效率和总除雾效率的影响，获得了不同粒径雾滴的运动和捕集规律。研究结果表明，粒径小于10μm的雾滴去除效率随流速增加呈现不规律的波动，随板间距增加而下降的趋势不明显，不受叶片形状变化影响；粒径大于16.3μm的雾滴去除效率随流速增加而增大，随板间距增加而显著下降；在板间距为38 mm时，梯形板除雾效率大于三角形板，在板间距较小的情况下两种板型的性能相差不大；流速小于3 m·s?1时，粒径小于20μm的雾滴的去除对气流均匀性要求较高，气流扰动增加利于小雾滴的碰撞聚并；流速高于3 m·s?1时，气流扰动增强增加了小雾滴运动的随机性，不利于小雾滴的碰撞聚并。
이용류체동역학계산방법대습법탈류절류판제무기내기액량상류동진행수치모의。분석료제무기협편간거、판형급류속대불동립경무적적분급제무효솔화총제무효솔적영향，획득료불동립경무적적운동화포집규률。연구결과표명，립경소우10μm적무적거제효솔수류속증가정현불규률적파동，수판간거증가이하강적추세불명현，불수협편형상변화영향；립경대우16.3μm적무적거제효솔수류속증가이증대，수판간거증가이현저하강；재판간거위38 mm시，제형판제무효솔대우삼각형판，재판간거교소적정황하량충판형적성능상차불대；류속소우3 m·s?1시，립경소우20μm적무적적거제대기류균균성요구교고，기류우동증가리우소무적적팽당취병；류속고우3 m·s?1시，기류우동증강증가료소무적운동적수궤성，불리우소무적적팽당취병。
In order to improve demisting efficiency of baffle demisters for different droplets and reduce droplet entrainment in the wet flue gas desulfurization (WFGD) system, the computational fluid dynamics (CFD) method was used to simulate numerically the two phase flow of gas and liquid in baffle demister in the WFGD system. By changing the structural parameters and operating parameters of the baffle demister, such as plate spacing, blade-shape and gas-velocity, demisting efficiency and droplets’ separation efficiency of different sizes were investigated. The movement behavior and deposition of droplets with different sizes were obtained. The removal efficiency of droplets less than 10μm would show irregular fluctuations if flow rate was increasing, but almost remained unchanged with increasing plate spacing. In that case removal efficiency was not affected by blade shape. The removal efficiency of droplets over 16.3μm would increase with increasing flow rate, and decreased significantly with increasing plate spacing. The demisting efficiency of trapezoidal plates was greater than that of triangle plates with plate spacing of 38 mm, and the difference in demisting performance for these two plates was not significant in smaller plate spacing. Removal of the droplets less than 20μm required higher airflow uniformity at lower gas flow rate. Increased airflow disturbance was in favor of small droplets’ collision-coalescence when gas flow rate was less than 3m·s?1, and increased airflow disturbance was not conducive to small droplets’ collision-coalescence when gas flow rate was over 3m·s?1.