首页> 外文学位 >Electrostatic Precipitator to Collect Large Quantities of Particulate Matter
【24h】

Electrostatic Precipitator to Collect Large Quantities of Particulate Matter

机译:静电除尘器收集大量的颗粒物

获取原文
获取原文并翻译 | 示例

摘要

Traditional aerosol samplers are limited in their abilities to collect large quantities of particulate matter due to their low flow rates, high pressure drops, and are noise intrusiveness. The goal of this study was to develop an alternate aerosol sampler using electrostatic precipitation technology that was safe and not noise intrusive to be deployed in homes. The O-Ion B-1000 was selected as the most suitable electrostatic precipitator (ESP) for achieving the goal of this study because of its affordability, the design of its collection electrode and its high flow rate. The collection efficiency of the ESP was assessed for three aerosols; Arizona Road Dust (ARD), NaCl and diesel fumes. ARD was found to have the highest average collection efficiency (65%) followed by NaCl (43%) and lastly diesel fumes (41%).;A method for recovering the particulate matter deposited on the collection electrode was developed. The dust collected on the electrode was recovered onto polyvinyl chloride (PVC) filters moistened with deionized water. Additionally, the recovery of the three test aerosols, ARD, NaCl, and diesel fumes, from the collection electrode was assessed. A gravimetric analysis was done to determine the amount of dust recovered. The collection efficiency was used to calculate the amount of mass expected on the filter for a particular aerosol. NaCl had the highest recovery at 95% recovery, followed by ARD (73%) and lastly diesel fumes (50%). Two identical ESPs were also deployed in an office and in a bedroom, 104.47 mg and 9.64 mg of particulate matter (PM) was recovered respectively.;The noise and ozone level produced by the ESP was evaluated to determine the ESP's viability as a household aerosol sampler. The ESP's high setting had a noise level of 45.8 dB and ozone generation rate of 0.036 mg/min. The results of the calculation showed that in an averaged size unventilated room (6.10 m x 6.10 m x 2.44 m), it would take 6 hours and 53 minutes for the ozone levels to reach the recommended maximum exposure limits per National Ambient Air Quality Standards (NAAQS). Additionally, a ventilation of 230 L/min is needed in order to prevent the ozone levels generated by the ESP from exceeding maximum exposure limits per NAAQS.;Overall, the O-Ion B-1000 met the criteria of collecting 1 mg of PM in a 24 hour sampling for ARD and NaCl. Diesel fumes however, required 30 hours to collect 1 mg of PM. The noise levels generated by the ESP set on high was one dB above the Environmental Protection Agency (EPA) standards for indoor noise limit. However, the noise is proportional to inverse distance squared; the ESP should not pose a problem during household deployment. Ozone generated by the ESP was also found to be below 0.07 ppm as set by the EPA with an average ventilation of 230 L/min. The average ventilation of a household is 1500 L/min, thus the ozone generated by the ESP would not surpass 0.07 ppm. However, the ESP should not be deployed in unventilated rooms for a period of more than 6 hours and 53 minutes.
机译:传统的气溶胶采样器由于其低流速,高压降和噪声干扰性而使其收集大量颗粒物的能力受到限制。这项研究的目的是开发一种使用静电沉淀技术的替代性气溶胶采样器,该采样器安全且不会干扰家庭使用。选择O-Ion B-1000是最合适的静电除尘器(ESP),因为它的价格合理,收集电极的设计和高流量,使其达到了本研究的目的。对三种气雾剂对ESP的收集效率进行了评估。亚利桑那道路扬尘(ARD),氯化钠和柴油烟雾。发现ARD的平均收集效率最高(65%),其次是NaCl(43%),最后是柴油烟气(41%)。将收集在电极上的灰尘回收到用去离子水润湿的聚氯乙烯(PVC)过滤器上。此外,还评估了从收集电极中回收的三种测试气溶胶ARD,NaCl和柴油机烟雾。进行了重量分析,以确定回收的粉尘量。收集效率用于计算特定气雾剂在过滤器上的预期质量。 NaCl的回收率最高,为95%,其次是ARD(73%),其次是柴油烟雾(50%)。办公室和卧室也部署了两个相同的ESP,分别回收了104.47 mg和9.64 mg颗粒物(PM).;评估了ESP产生的噪音和臭氧水平,以确定ESP作为家用气雾剂的可行性采样器。 ESP的高设置具有45.8 dB的噪音水平和0.036 mg / min的臭氧产生速率。计算结果表明,在平均大小的不通风房间(6.10 mx 6.10 mx 2.44 m)中,要达到国家环境空气质量标准(NAAQS)推荐的最大暴露极限,臭氧水平将需要6个小时53分钟。 。此外,需要通风230 L / min,以防止ESP产生的臭氧水平超过每个NAAQS的最大暴露极限。总体而言,O-Ion B-1000符合在标准条件下收集1 mg PM的标准。对ARD和NaCl进行24小时采样。但是,柴油烟雾需要30个小时才能收集1 mg PM。将ESP设置为较高时所产生的噪声水平比环境保护局(EPA)的室内噪声限制标准高出1 dB。但是,噪声与距离的平方成反比。在家庭部署期间,ESP不会造成问题。由ESP产生的臭氧也被发现低于EPA规定的0.07 ppm,平均通风量为230 L / min。一个家庭的平均通风量为1500 L / min,因此ESP产生的臭氧不会超过0.07 ppm。但是,ESP不应在不通风的房间中部署超过6小时53分钟。

著录项

  • 作者

    Ong, Chun Hoe.;

  • 作者单位

    The University of Iowa.;

  • 授予单位 The University of Iowa.;
  • 学科 Environmental health.;Environmental studies.;Health sciences.
  • 学位 M.S.
  • 年度 2017
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号