濕式靜電集塵器效率特性之研究

Efficiency Characteristics of Wet Type Electrostatic Precipitator

鄭宇智(Yu-Chich Cheng)

指導教授 ： 林文印

國立臺北科技大學/工程學院/環境規劃與管理研究所/碩士(2014年)

https://doi.org/10.6841/NTUT.2014.00002

摘要

靜電集塵器(ESP)是利用電能去除粒狀污染物之高效率集塵裝置，靜電集塵器相對於其他種類的除塵設備，雖具有較高的設備成本，但是在操作成本方面卻遠低於其他種類的設備。因此，靜電集塵器廣泛地被一般工業界所應用在改善污染排放。然而，傳統乾式靜電集塵器有以下問題：粉塵沉積於集塵板表面與極線上造成收集效率降低、逆電暈以及粉塵再揚起現象。
本研究設計並開發一個濕式靜電集塵器用以解決乾式靜電集塵器的問題。本研究主要探討以下目的：濕式與乾式靜電集塵器效率特性、集塵板材質對於集塵效率之影響、微粒電阻率與集塵效率之關聯性、濕式靜電集塵器之臭氧產生量。
研究結果顯示，濕式靜電集塵器能有效改善乾式靜電集塵器長時間在高電阻微粒下集塵板負載的問題。此外，比較不鏽鋼、導電玻璃與一般玻璃材質之集塵板對於集塵效率之影響。靜電集塵器操作電壓固定為-10kV。在乾式靜電集塵器操作下，不鏽鋼集塵板與導電玻璃集塵板微粒穿透率約為6%以下，而一般玻璃微粒穿透率高達40%以上；在濕式靜電集塵器操作下，一般玻璃微粒穿透率下降到20%以下。由結果所示，濕式靜電集塵器能提升一般玻璃的集塵效率。此外，臭氧生成量主要受到電流值的影響，因此在相同電壓下，臭氧濃度會隨著電暈電流增加而增加，實驗結果顯示，玻璃材質之集塵板產生的臭氧量比不鏽鋼與導電玻璃材質之集塵板還低。

關鍵字

濕式靜電集塵器 ； 收集效率 ； 微粒負載 ； 電阻率

並列摘要

Electrostatic Precipitator (ESP) is a high efficiency dust collector, which utilizes electric energy to remove particulate matter. The capital cost of ESP is relatively more expensive than other general dust collector. However, duo to the lower operational cost, ESP is widely used in industry for improving pollutant emissions. Nevertheless, the traditional dry ESP still have some problems: reduction of the collection efficiency due to particle deposition on the discharge and collection electrodes, back corona, and particle re-entrainment. In this study, a wet electrostatic precipitator (wet ESP) be designed and investigated to improve the ESP.
The objectives of this research included efficiency characteristics of wet ESP and dry ESP, the materials of collecting plate on particle collection efficiency, the electrical resistivity of particle on collection efficiency, and the ozone concentration of wet ESP.
The experimental results indicated that the wet ESP can improve the high resistivity particulate loading of the dry ESP after long time elapsed. Then the research compares the different collection efficiency with different materials of the collector. The ESP was operated at voltage -10kV. In the dry ESP, the particle penetration of stainless steel collector and conductive glass collector were under 6%, but the particle penetration of glass collector was over 40%. In the wet ESP, the particle penetration of glass collector reduced below 20%. These results showed that the collection efficiency of glass collector can be improved in the wet ESP. In addition, the ozone production was linear on the current, therefore, at the same electric field, the ozone concentration increased as increasing the corona current. According to the Experimental results, the ozone concentration of glass collector is lower than the stainless steel collector and conductive glass collector.

並列關鍵字

Wet Electrostatic Precipitator ； Collection efficiency ； Particulate loading ； Electrical resistivity

參考文獻

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