靜電集塵器之參數探討-以室內線香燃燒為例

Abstract

隨科技與網路的進步，人們待在室內的時間越來越長，因此室內空氣品質也更加地被重視。本研究針對空氣中的懸浮微粒來做探討，設計一靜電集塵裝置，以最小化尺寸為前提，探討各種幾何及操作參數對於空氣中微粒污染物的收集效率，找出最佳化的結果。 研究中建置線板式二階靜電集塵器，並將其分為充電區、過渡區及收集區。充電區測試不同的線極板極間距和線極數量的電流特性。將充電區長度定義為一單位長（1 X），過渡區與收集區分別以0、0.5、1倍長和1、2、3 倍長，並以53 cfm 和90 cfm的風量進行收集效率測試。最終得到之各區域操作及幾何參數分別為：充電區線板極間距7.5 mm，線極間距10 mm，操作電壓為10 kV；收集區操作電壓則為12 kV。此外結果顯示收集區尺寸 3 X 和 2 X 的收集效率表現沒有明顯區別，而過渡區的移除（0 X）對PM1收集效率影響最多達12%，但對於PM2.5和PM10的收集效率幾乎沒有影響。當過渡區和收集區分別為充電區0.5倍及2倍長時，對於PM1、PM2.5和PM10之20分鐘內收集效率均可達到90%以上。並以類似潔淨空氣輸出比率（Clean Air Delivery Rate, CADR）之計算方法推算靜電集塵器之效能。此外也將實驗中參數以白金漢π定理找出一無因次參數群作為實驗總結。

Air pollution levels remain dangerously high in many parts of the world. People arise increasing concern to air quality. In this study, the electrostatic precipitator (ESP) was designed to remove the aerosol particles. The comprehensive investigation of operating parameters of ESP was carried out. In the experiment, Electrostatic Precipitator, the two-stage, wire-plate ESP was established, and it consisted of charger, transition zone and collector. The characteristic of corona current was tested by adjusting the pitch between corona electrode and collecting electrode and the number of corona electrode. The length of charger was defined as a unit X, and the experiments was conducted with different combinations with various transition zone lengths as 0, 0.5 , 1 X, the collector lengths as 1 , 2 ,3 X, and flow rates of 53 cfm and 90 cfm. Finally, the operating voltages and geometrical parameters showed a best combination of 7.5 mm between the corona electrodes and the collecting electrodes, 10 mm between corona electrodes, operating voltage of 10 kV in the charger, and operating voltage of 12 kV in the collector. The results of collecting rate of PM2.5 and PM10 indicated no significant difference with lengths of 3 X and 2 X of collector, or even without transition zone. However, the collecting rate was declined by up to 12% without transition zone. Moreover, the similar calculating way of clean air delivery rate (CADR) was conducted to quantify the performance of the ESP. In the end, the Buckingham π theorem was applied to find out the major dimensionless group of π1.