【作者】 杨春方；

【导师】 党小庆； 王迪；

【作者基本信息】 西安建筑科技大学 ， 供热、供燃气、通风与空调工程， 2005， 硕士

【摘要】 我国燃煤发电锅炉约90%左右采用电除尘器,允许烟尘排放浓度小于50mg/m~3(标),需要进一步提高电除尘器的性能、降低粉尘排放浓度。放电极和收尘极的结构和配置几何参数决定电除尘器的电场特性,是影响电除尘器效率的重要因素之一。 本文选择火电厂电除尘器常用的9种电晕线,通过测量了这几种电晕线与C480型阳极板在同极距350mm,400mm和450mm条件下的V-I特性、板面电流密度大小和分布,分析了电极配置参数对V-I特性和极板表面电流密度大小和分布的影响。采用表征电流密度大小的平均电流密度(?)和表征分布均匀性的方差σ作为电场特性的评价指标,给出了几种电场特性参数较好的电极配置形式和参数调整范围。 数值分析有助于进一步深入地了解电场特性随电极配置参数变化的规律。本文比较了不同求解模型的优劣,通过求解二维情况下圆线和芒刺线的电晕电场,初步探讨了数值分析的方法及影响计算结果精度的因素。采用MATLAB编程对电晕电场进行求解,并与实验结果进行了对比,二者基本吻合。更多还原

【Abstract】 In our country, about 90% electrostatic precipitators are employed for collecting fly ash in coal-fired power plants. The new allowed particulates emission for new coal-fired power plants is 50 mg/m3(standard), so it is required to improve the performance of electrostatic precipitator and reduce the emission concentration of fly ash. The geometric shape of discharge and collecting electrodes and the combination geometry parameter influence the electric field characteristic of electrostatic precipitator is one of the main factor which influences the efficiency of electrostatic precipitator.In this paper, 9 kinds of discharge electrodes which are usually used in electrostatic precipitator of coal-fired power plants are choused. By measured the V-I characteristic and the current density on the collecting plate on the condition of 350mm and 400mm and 450mm collecting electrode spacing, Analyzed the different parameters of combinations which influence the V-I characteristic and thecurrent density on the collecting plate. Used the average current density j and distributionrelatively deviation σ to discuss the effect of different discharge electrodes and setting manner; Give several kinds of better electrical field of different combination and the range of parameter adjustment.Numerical analyzing can help deeply study the law of electric field characteristic which changed with parameters of combinations. The paper compares characteristic of different computing model. By computing two-dimension electric field of round and stab electrodes, discuss the methods of numerical analyzing and the factors which influence the precision of computing result. Programmed with MATLAB and compute the corona electric field. The results compare with the results of experiment and they fit well.更多还原