许德玄
特种电晕等离子体放电及其在环境工程中的应用;粘性粉尘烟气的净化(饮食业油烟,沥青烟气,焦油烟气,柴油炉烟气,柴油机尾气);细小粉尘的荷电和凝并;室内空气净化;高效脱硫除尘一体化技术;放电等离子体水处理技术
个性化签名
- 姓名:许德玄
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学术头衔:
博士生导师
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学科领域:
环境科学技术基础学科
- 研究兴趣:特种电晕等离子体放电及其在环境工程中的应用;粘性粉尘烟气的净化(饮食业油烟,沥青烟气,焦油烟气,柴油炉烟气,柴油机尾气);细小粉尘的荷电和凝并;室内空气净化;高效脱硫除尘一体化技术;放电等离子体水处理技术
许德玄,东北师范大学环境科学与工程系教授,博士生导师。1968年毕业于中国科学技术大学,1988-1989年为瑞典乌普沙拉大学高级访问学者,1999-2002被聘为大连理工大学兼职教授。已主持完成国家自然科学基金项目两项:“脉冲电晕放电的电子荷电机理及提高微小颗粒荷电研究”和“静电雾化电晕放电及细小粘性粉尘烟气除尘”。已主持完成国家“九五”科技攻关项目子课题“脉冲电晕等离子体烟气脱硫的产物收集技术研究”。正在主持国家自然科学基金项目“磁增强电晕放电及其对微小粉尘的荷电”。已参加完成国家及省部级科研项目三项。已获国家专利四项:“高效臭氧净水器”,“水电极静电油烟净化器”,“水电极无声放电雾化净水器”和“磁增强雾化电晕放电低温等离子体烟气除尘净化器”。目前研究方向为:特种电晕等离子体放电及其在环境工程中的应用;粘性粉尘烟气的净化(饮食业油烟,沥青烟气,焦油烟气,柴油炉烟气,柴油机尾气);细小粉尘的荷电和凝并;室内空气净化;高效脱硫除尘一体化技术;放电等离子体水处理技术。
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502
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成果数
13
【期刊论文】Study of magnetically enhanced corona pre-charger
许德玄, Dexuan Xu, Lianxi Sheng, Haijun Wang, Yinghao Sun, Xiaoyu Zhang, Junfeng Mi
D. Xu et al. Journal of Electrostatics 65 (2007) 101-106,-0001,():
-1年11月30日
In this paper, experimental investigations of the discharge characteristics of magnetically enhanced corona discharges, for the purpose of capturing ne aerosol particles, are presented. The discharge mechanism during such a process is analyzed as well. The effects of magnetic enhancement under different magnet ux densities, and in positive- or negative-corona discharges, were experimentally compared. The magnetically enhanced effects in different inter-electrode regions were studied. Experimental results demonstrated that the magnetic eld could efciently increase the concentrations of both the negative ions and the free electrons during negative-corona discharge. The dominant mechanism of magnetic enhancement in a corona discharge involves the Larmor precessions of free electrons which enhance ionization of the gas molecules near the discharge electrode. A convenient conguration for enhancing corona discharge was formed by placing permanent magnets with a local strong magnetic eld near the discharge electrode. A magnetically enhanced negative-corona (MNC) pre-charger was assembled in front of an electrostatic enhancement lter. The inuence of the MNC pre-charger on the efciencies of an electrostatic enhancement lter was measured and compared with that of a conventional corona pre-charger. The free-electron-charging mechanism of the MNC pre-charger was preliminarily analyzed. Our results show that the new pre-charging technique is promising for capturing ne aerosol particles in electrostatic enhancement lters or electrostatic precipitators.
Magnetically enhanced corona discharge, Pre-charger, Charging aerosol particles, Capturing ne aerosol particles
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【期刊论文】Positive Short-Pulse Corona Discharge Charging of Aerosol Particles
许德玄, Xu DEXUAN, Sheng LIANXI, Zhai JINGSHENG and Zhao JIANWEI
Jpn. J. Appl. Phys. Vol. 42 (2003) pp. 1-4, Part. 1, No. 4A, April., 2003,-0001,():
-1年11月30日
Experiments of charging particles by positive short-pulse corona discharges have been carried out. The experimental results show that the number of negatively charged particles was more than that of positively charged ones. The number ratio of the negatively charged particles to the positively charged ones can reach 2 : 1. The theoretical analysis demonstrates that the positive short-pulse corona discharges include both streamer and corona discharges. The positive streamer discharges consist of many nonthermal plasma leads (streamers) of the branch type, which have high ionizability and propagate rapidly from anode to cathode with the aid of ionization by light. The streamer discharges are at the prebreakdown stage. The positive corona discharges have a thin ionization layer around the anode and most of the interelectrode space is a positive-ion-charging region. The process of charging particles in positive short-pulse corona discharge can be divided into four stages. The free electron charging, which is produced by positive pulsed streamer discharges, is a signicant process for charging particles in positive short-pulse corona discharges. [DOI: 10.1143/JJAP.42.dummy]
positive short-pulse discharge, charging of aerosol particles, electron charging
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许德玄, Dexuan Xu, Jie Li, Yan Wu, Linhui Wang, Dawei Sun, Zhongyang Liu, Yanbin Zhang
D. Xu et al. Journal of Electrostatics 57 (2003) 217-224,-0001,():
-1年11月30日
Some new electrode congurations and high-voltage insulation methods have been employed in order to force the water sprays to pass across the near corona region. In these ways, the efciencies of charging and collecting aerosol particles are increased. At the same time, the sprays ejected from the discharge electrodes can overcome some difculties of electrostatic precipitation, such as the back ionization of dusts with high resistivity, the reentrainment of ne dusts and the fouling of discharge electrodes. In recent years, there are increasing demands for the researches of the theory and the application on this type of corona discharge. In this paper, we introduced the discharge characteristics and some examples of the applications of the direct current corona with spraying discharge electrodes.(c)2002 Elsevier Science B.V. All rights reserved.
Corona discharge, Discharge electrode, Spray electrodes, Electrostatic precipitation, Atomization, Scrubber
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【期刊论文】Removal of adhesive dusts from flue gas using corona discharges with spraying water
许德玄, XU De-xuan, ZHAO Jian-wei, DING Yun-zheng and GE Wei-li
Journal of Environmental Sciences Vol. 15, No. 4, 2003,-0001,():
-1年11月30日
Effective removal of adhesive and fine dusts from flue gas is very difficult. In this paper we introduce a new method of electrostatic precipitation of the Corona Discharges with Spraying Water (CDSW). A new electrode configuration and the circulation spraying of water were employed in the method. The efficient electrostatic precipitation for adhesive and fine dusts can be accomplished without any drain water during a long operating period. The fundamental structure, discharge characteristics, mechanism of spraying and precipitation principle of the electrostatic precipitation using CDSW were described and analyzed in detail. The V-I characteristics, spraying state, supplying water quantity, influence of temperature and clean of the electrodes were researched in series experiments. The treating effects of circulating spraying using the corona plasma at the same time of electrostatic precipitation were preliminary investigated. The fundamental theories and experimental data were proposed, in order to effectively remove the adhesive dusts from flue gas using CDSW in practice.
Aerosol with adhesive dusts, Corona Discharges with Spraying Water, Electrostatic precipitation
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许德玄, 郭治明, 孙英浩, 潘振东, 米俊峰
,-0001,():
-1年11月30日
采用模拟除尘装置,研究比较了雾化电晕放电和干式电晕放电的电晕起始状态、伏-安特性和除尘效率。实验表明,在相同电压和较高烟气流量条件下,雾化负电晕放电比干式负电晕放电的除尘效率提高28%(从78.2%提高到84.2%) 对雾化电晕放电中新的放电特性和除尘机制进行了分析和讨论。对雾化负电晕放电和雾化正电晕放电的实验比较表明,雾化负电晕放电更适合应用于烟气中颗粒污染物的去除,而雾化正电晕放电中扩大的低温等离子区对雾化循环水的净化起到重要作用。
雾化电晕放电, 静电除尘, 低温等离子体
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26浏览
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许德玄, Zhanhua Wang, , Dexuan Xu, Yu Chen, Zijie Zhao
,-0001,():
-1年11月30日
The plasma decoloration process of indigo carmine aqueous solution is investigated in this paper using a dielectric barrier discharge with earthed spraying water electrodes (spraying DBD). The influence of high voltages and air gaps on decoloration and the power consumption in the process were discussed. The indigo carmine aqueous solution was employed as grounding spraying water electrode. The plate electrode was covered by a layer of glass dielectric on its inter-electrode surface and supplied with AC 50 Hz high-voltage. The spraying DBD non-thermal plasma was formed in the air gap between the water electrodes and the glass dielectric plate. The experimental results have shown that the decoloration rate increases with rising high voltages and decreasing air gaps. When the air gaps were 30 mm and the voltage was 30 kV, the decoloration rate has got to 95% in 18 minutes. The lower power consumption and the higher decoloration rate could be reached, when the air gaps was 30 mm and the voltage was 25 kV.
Spraying, Dielectric Barrier Discharge, Non-thermal plasma, Decoloration
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【期刊论文】Electrons, Ions And Electric Field Between Electrodes in Negative Corona Discharge
许德玄, XU Dexuan
,-0001,():
-1年11月30日
A new electron-ion hypothesis has been proposed in this paper and employed to compute the distributions of free electrons, negative ions and electric field between electrodes in negative corona discharge. The experiments for charging aerosol droplets, which passed through the region between electrodes, confirmed above hypothesis and computation.
free electrons, Negative corona, Electron charging
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许德玄, 孙明, 赵小明
HIGH VOLTAGE ENGINEERING Aug., 2000, Vol. 26, No. 4,-0001,():
-1年11月30日
采用以水作放电极的无声放电方式,使放电产生的臭氧和其他活性粒子直接作用于被放电雾化的待处理水,可增加水中臭氧的浓度,简化臭氧产生和净化的程序.初步实验经碘量法测定,处理后水中臭氧的质量浓度可达0.58mg/L,调整放电间隙及电极尺寸均可使水中臭氧质量浓度增高。该项技术所需装置小、成本低、易于推广。
水放电极, 水中臭氧浓度, 无声放电
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许德玄, 刘钟阳
ENVIRONMENTAL SCIENCE Nov., 1998,-0001,():
-1年11月30日
为了便于脱硫产物的收集和应用,用沉降法采样,用电子显微镜对产物气溶胶进行粒径分析.实验在窄脉冲电晕放电装置上,模拟含硫烟气在工况条件下(气体流量2m3/h,反应器入口处SO2浓度2000ml/m3,SO2和NH3在通道中停留时间为5s以上,温度60℃、水蒸气体积比7.5%,相对湿度38.2%)进行.电子显微镜的观测结果显示,脱硫产物粉尘结构疏松,颗粒形状不规则.根据电镜照片的统计结果,得出产物粉尘的数目中位径NMD为0.40μm,几何标准偏差σ1=5.21;质量中位径MM灰2.82μm,几何标准偏差σ2=1.43.
窄脉冲, 粒径分析, 脱硫产物, 电子显微镜, 气溶胶
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许德玄, 孙大伟
环境科学学报1998年9月第18卷第5期/ACTA SCIENTIAE CIRCUMSTANTIAE Sept., 1998, Vol. 18, No. 5,-0001,():
-1年11月30日
对异极距为150mm的V型收尘极板的电流密度分布和抑制高比电阻粉尘反电晕的机制进行了分析.采用模拟粉尘层验证了其抑制反电晕的效果.确定V型收尘极板的张角取80°--90°为宜.极板边缘向放电电极面曲率半径r和异极距a应满足关系式r ≥a/25.
V型极板, 高比电阻粉尘, 粉尘反电晕, 电除尘
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