Improvement of the Efficiency of Charging and Electrostatic Precipitation of Nanoparticles
TSAI CHUEN - JINN
|關鍵字:||微粒充電器;靜電集塵器;濕式靜電集塵器;空氣污染控制;奈米微粒;particle charger;electrostatic precipitator;wet ESP;air pollution control;nanoparticle|
極線-圓管型(unipolar single wire-in-tube)微粒充電器內部的微粒靜電損失很多，造成奈米
器，本設計利用4 條放電電極線增加空氣離子的濃度, 以及利用接地電極圓管內壁上的
Sampling and control techniques of nanoparticles often require that nanoparticles are charged. However, nanoparticle charging efficiency is low for the unipolar, single wire-in-tube particle charger due to its severe internal particle electrostatic loss. Therefore, it is important to improve the charging efficiency of nanoparticles by using an efficient particle charger. Based on theoretical modeling and experimental validation, this project intends to develop a new multiple wires-in-tube particle charger, which makes use of 4 discharge wires to increase the ion concentration, and sheath air around the collector tube to avoid charged particle loss. The charger is expected to improve the amount of charges and charging efficiency of nanoparticles. In addition, there is dispersion air surrounding the wires such that particles do not deposit on the wires easily. Therefore, it is expected that the life time of the charger can be extended. Dry electrostatic precipitators have several problems such as low collection efficiency for nanoparticles, drop of collection efficiency as dust particles are loaded on the collector plates, influence of collection efficiency due to reentrainment of rapped dust cake, back corona generated by particles of high resistivity, removal of sticky dust and liquid particles by rapping is not possible. All these problems can be solved by wet electrostatic precipitators. This project intends to combine the new multiple wires-in-tube particle charger and the plate-type wet collector electrodes to make a two stage wet electrostatic precipitator to improve the collection efficiency of nanoparticles. Experimental study will be conducted in the laboratory to determine the collection efficiency using test particles of high concentration. Oily particles from the restaurants and high concentration dust particles from the high-tech companies will be used in the pilot testing of the two stage electrostatic precipitator to improve its applicability.
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