电除尘器波形板与小芒刺线匹配的优化研究

给出了以波形板、芒刺线作电除尘器收尘极、放电极的实验和数值模拟结果。利用可加偏压的边界探头测量电晕放电条件下近板场强和板面电流分布，芒刺距离、刺长对电晕放电的影响规律和决定最佳板距的因素进行了研究。在此基础上，获得与ＺＴ－２４板匹配的小芒刺线的最优几何形状。对波形板配光圆线在放电条件下电场、电流分布作了数值模拟。     

电除尘器二维空间电场强度和电流密度的研究

本文采用钢球射击法研究了电除尘器内的场强(E)和电流密度(J)的二维空间分布规律。在对圆线——平板型除尘器研究的基础下,进一步探讨了型线、型板的近极空间E、J分布特性,发现锯齿、芒刺线——平板除尘器的近极空间电流密度可由Warburg定律推算;电场强度可通过本文作者推出的经验式E(θ)=E(o)×cos~2θ计算:并且近型板空间(除特殊区域外)E、J分布可由相同尺寸布置的近平板空间的E、J分布进行估算。     

H型电除尘器的研究

本反通过试验研究提出一种新型的 H 形收尘极的电除尘器,其结构特点是采用与气流方向垂直的H 形横向收尘极和芒刺放电极,以及第三电极,从而改善了粉尘的荷电和收尘的条件,增加了收尘面积,从而使收尘效率和驱进速度有较大的提高。与常规电除尘器比较可以节约钢材,有明显的经济效益。     

电除尘器电晕电场的测试

电除尘器的电场分布,是研究、改进电除尘效果,提高除尘效率的基础,是设计新型电除尘器的依据。对它的研究不但有理论价值而且有很大的实用价值,本文拟对线一板式电除尘器电场分布的测试作一探讨。电除尘器的电场,一般由极间加高电压产生的静电场,电晕放电产生离子流所产生     

不等电容、不等台阶、分段等厚度电容芯子的设计方法

首先利用许瓦兹—克利斯托夫变换法,对电容芯子二极板之间边缘处的电场位进行了计算分析,并由此得出极板台阶长度变化对极板边缘处电场值的影响不大,而二极板间的径向场强对极板边缘处的场强值则有着较大的影响.在此基础上提出了一种不等电容,不等台阶,分段等厚度的设计方法,并给出了这种设计方法的计算程序     

电除尘器电晕极悬挂装置振打加速度的测定与分析

本文根据对电除尘器电晕极挂钩式悬挂装置和框架式悬挂装置进行的多次测定,对这几种悬挂方式进行了分析,并提出了电晕极悬挂装置的优选。     

线管式静电除尘器性能研究

本文简要介绍了静电除尘器去除空气中颗粒污染物的原理,利用FLUENT软件对管式电除尘器中的气固两相流进行了数值模拟,分析了不同的颗粒粒径、极线电压、进口流速与除尘效率的关系。数值模拟的结果对电除尘器的研究和设计有着重要的指导意义。     

《通风除尘》1993年总目录

名称期页名称期页20 42 45 2 613玲19 4140l024武钢硅钢片厂cP抛丸机电除尘器测试及分析间歇运行锅炉的污染物排放特征锅沪混烧高炉煤对电除尘器效率的影响电除尘器电晕极悬挂装置振打加速度的测定与 分析选煤厂破碎筛分间煤尘治理技术途径的研究宽间距电除尘器在回转烘干机上的应用高温淘瓷纤维滤管的试验研究混铁炉除尘设计与研究通风除尘系统的网络优化设计法工业锅炉旋风除尘器性能的模糊综合评价论电除尘器振打清灰的检测与故障诊断人川’型脉动微震除尘器设计与应用脉冲除尘器技术改造措施丹麦脉冲激能电除尘器的使用情况及 测试评价…     

立窑除尘及相关问题

讨论了立窑的特殊工况及除尘方面存在的问题,分析了普通电除尘器在立窑除尘中的不足,介绍了湿法电除尘器的特点及在立窑生产中的使用情况。     

捕集炼钢化铁炉烟尘的电除尘器改造试验研究

上钢一厂针对炼钢化铁炉烟尘的性质,在生产现场装置了一台试验可调型电除尘器,按不同的电极型式,极距和电场风速组合成42种电场结构进行现场工况试验。试验数据表明,采用一定的宽极距电场或原式电场对捕集高比电阻的化铁炉烟尘是有效的。1988年,上钢三厂在一座炼钢化铁炉的SWB—60电除尘器按试验取得的参数进行了改造,目前已投入运行。经现场除尘效率测定,烟尘排放浓度为92.17mg/Nm~2,电除尘器除尘效率为93.48％,工作电压稳定运行在4l1—43kv,取得了预期的效果。     

Numerical study on PM10 collection efficiency in a wire-cylinder electrostatic precipitator under multi-field coupling

The PM10 collection efficiency of a wire-cylinder electrostatic precipitator (ESP) was studied by means of a developed mathematical model, including the multi-field coupling between the gas flow field, the particle dynamic field and the electric field, and applying the Deutsch–Anderson Equation. The diffusion charging mechanism was considered due to the diameter range of PM10. The investigated variables were the applied potential, the gas velocity and the particle distribution. Numerical results indicate that the diffusion charging has significant influence on PM10 removal performance and the effect is more obvious with the decreasing diameter, and that the PM10 collection efficiency increases with the increasing applied potential and the increment of collection efficiency is more significant at lower voltage. Moreover, as the gas velocity at inlet decreases, collection efficiency of PM10 will increase. Finally, the overall efficiency increases with increasing the mean diameter of particle distribution. The research results can provide theoretical and technical references for the design of novel ESP aiming at economy and environment protection.     

强电场作用下极细颗粒黏土渗流特性分析

采用常水头渗流法试验,利用数据直流电源提供强电场,研究极细颗粒黏土的渗流的电场效应,在相同试验条件下完成了人工高岭土与人工膨润土按一定比例混合的试样的渗流特性测试。测试结果表明,外加电场对极细颗粒黏土的渗流特性有相当显著的影响,随着电场强度的升高,试样的渗透系数呈先减小后增大的趋势;在相同的电场强度下,试样的渗透系数会随着时间逐步变化,最终趋于稳定。对有无电场作用下渗流后的试样分别进行压汞试验,测试结果表明,在强电场作用下黏土颗粒产生重新排列,从而改变了孔隙结构和尺度,使渗透系数有所增加。试验结果分析认为,电场作用下,黏土颗粒和孔隙水都会产生极化现象,土颗粒和水分子在这种静电力作用下作定向排列,从而改变了试样的孔隙分布情况和孔隙水的粘度,进而影响孔隙水渗流特性。     

Crossflow electro-microfiltration of oxide-CMP wastewater

In this work, an electrically enhanced crossflow microfiltration (EECMF) system was used for the treatment of oxide-CMP wastewater under different operating conditions to investigate their effects on filtration rate. Oxide-CMP wastewater was obtained from a wafer fab and characterized by various standard methods. A membrane with a cut size of 0.1microm was used in the EECMF system. Operating parameters studied include crossflow velocity, transmembrane pressure, mode of electric field, electric field strength, and mode of backwashing. The filtration rate was found to increase with increasing crossflow velocity, electric field strength, and transmembrane pressure when operated below the critical electric field strength. Experimental results indicated that intra-filtration-run backwashing outperformed inter-filtration-run backwashing in terms of filtration rate. Experimental results also showed that the filtration rate for pulsed mode operation was greater than that of no electric field application, but worse than that of continuous mode operation. Using the present EECMF system, a fairly good quality of filtrate was obtained. It was found that the filtrate having a turbidity of 0.39 NTU is achievable. Thus, the filtrate could be reused for non-process applications.     

Particle distribution analysis along the collection electrode of a ‘wire-to-cylinder’ electrostatic precipitator

This study determined the value distribution of the ‘charge/mass’ ratio of the particles charged by corona along a ‘wire-cylinder’ electrostatic precipitator (ESP). These particles are absorbed by suction from the openings on the collection electrode. The results enabled the analysis of the particle movement in the ESP. For moderate voltage values (8–12 kV), the constant ratio along the ESP suggests that the product is uniformly collected when the particles acquire a sufficient electric charge during their progression. Conversely, for higher voltages (14–16 kV), massive deposition occurs at the inlet as soon as the particles are sufficiently charged.     

基于Matlab的ZnO压敏陶瓷几何效应研究

ZnO压敏陶瓷击穿场强E1mA由晶粒尺寸和单个晶界击穿电压两个因素共同决定,沿用之前提出的微观结构模型,在晶粒尺寸一定,晶界电压服从正态分布;晶界电压一定,晶粒尺寸服从正态分布;和晶粒尺寸、晶界电压都服从正态分布三种条件下,用Matlab分别模拟击穿场强随厚度的变化关系,结果表明ZnO压敏陶瓷击穿场强的几何效应主要来自晶粒尺寸和分布的影响。在此基础上,对初始厚度不同的试样进行击穿场强与厚度的关系模拟,从结果可以看到,无论是高击穿场强还是低击穿场强的试样,都存在几何效应。     

Elimination of free-living amoebae in fresh water with pulsed electric fields

This study investigates the effects of pulsed electric fields on the inactivation of trophozoite form of Naegleria lovaniensis Ar9M-1 in batch and flow processes, systematically examining the lethal effect of field strength, pulse duration, number of pulses, and pulse frequency. Our results show that amoebae eradication is modulated by pulse parameters, composition of the pulsing medium, and physiological state of the cells. Cell survival is not related to the energy delivered to the cell suspension during the electrical treatment. For a given energy a strong field applied for a short cumulative pulse duration affects viability more than a weak field with a long cumulative pulsation. We also determine the optimal electrical conditions to obtain an inactivation rate higher than 95% while using the least energy. Flow processes allow to treat large-scale volumes. Our results show that the most efficient flow process for amoeba eradication requires a field parallel to the flow. Pulsed electric fields are a new and attractive method for inactivating amoebae in large volumes of fresh water.     

极性反转试验中,±800kV换流变压器套管尾部的电场分布研究

±800 kV换流变压器出线套管,是一个结构复杂的绝缘系统。在试验与运行中,套管要承受不同形式电压的作用。特别在直流极性反转的情况下,套管尾部结构复杂,电场十分集中,易发生油中闪络或击穿放电,严重威胁特高压换流变压器的安全运行。应用有限元法,仿真计算了±800 kV换流变压器出线套管尾部的电场分布,计算结果表明:在极性反转试验中,套管尾部电场分布不均匀,且不同时刻、套管尾部电场分布及各关键位置的场强变化呈现线性特性。进一步分析得知:在套管设计中,不仅要考虑正负极性反转试验电压下的稳态电场分布,还应重视极性反转过程中暂态电场与界面空间电荷效应,以便留有足够的裕度,避免在极性反转试验时套管损坏。     

Lab-scale test of a ventilation system including a dielectric barrier discharger and UV-photocatalyst filters for simultaneous removal of gaseous and particulate contaminants

A ventilation system including a dielectric barrier discharger (DBD) and UV-photocatalyst (UVP) filters was designed and tested for simultaneous removal of gaseous and particulate contaminants in a test chamber. The DBD was used in the first stage of electrostatic precipitator (ESP) for particle charging and gas decomposition. An applied DC electric field was used in the second stage of ESP to collect the charged particles. UVP filters were then used to decompose gaseous species, such as formaldehyde (HCHO) and benzene, toluene, and xylene (BTX) including O3, which was inherently produced by the DBD. %Reductions in mass concentration of PM2.5 and number concentration of submicron particles were approximately 79.5% and 76.3%, respectively, after the ventilation with air cleaning system was operated for 5 h. Both HCHO and BTX were completely removed when the initial concentration of each gas was 1 ppm. PRACTICAL IMPLICATIONS: Indoor air quality (IAQ) problems, such as sick building syndrome (SBS), are caused by limited ventilation in high-rise buildings. To overcome these problems, DBD and UVP filters were applied into a lab-scale ventilation system for simultaneous removal of pollutant particles and gases. The data supplied in this study will be useful for designing any actual ventilation system after further research, including scale-up experiments.     

高压架空线路对人居环境的影响

对一高度为30m的同塔双回110kV送电线路的电场强度和磁场强度进行了实测,依据测量结果和《电力行业劳动环境监测技术规范》(DL/T799-2002)第七部分:极低频电磁场监测,探讨高压架空线路对人居环境的影响。     

附加电场条件下吹填土的电性响应

以广西北部湾经济区吹填土作为研究对象,将土样置于稳定直流电场中,通过控制电场的有无,同时调整场强、土样含水率、密实度以及淡化程度,研究不同条件下土体内部电荷的变化规律,初步模拟雷雨云与大地之间的电性响应,以便进一步探究岩土体的"引雷"机制。结果表明,附加电场与大气电场均对土体内部电荷变化存在影响,且随着场强的增大表现得更显著;高含水率、低淡化程度,能促进电荷移动,增强土体导电性能,但含水率升高到一定程度后这种作用趋于稳定状态;土体密实度对其内部电荷分布具有一定影响,但规律性不明显。