臺灣博碩士論文加值系統

空氣中的懸浮微粒(Particulate matter, PM)是亞洲空氣汙染中一個重要的問題，聯合國國際癌症研究署 (International Agency for Research on Cancer)也將其列為第一級致癌物，而根據台灣行政院環保署建立之空氣污染排放總量資料庫清冊系統(TEDS 9.0; Taiwan Emission Data System 9.0)指出台灣在2013年餐飲業排放油霧占總PM2.5整年排放量之6.39%，而針對台灣不吸菸之家庭主婦，如果長期處於因高溫烹飪所產生之油霧環境下，會增加其罹患肺癌3.2％至12.2％的風險比率，因此如何有效控制油霧之問題十分重要。然而在市場上廣泛使用之纖維濾材在負載油霧後壓降會急遽提升，導致使用一段時間即需更換，為了延長纖維濾材之使用壽命，本文利用慣性收集板、大孔徑之不鏽鋼濾網等在過濾油霧時較不會發生阻塞或壓降急遽提升之過濾器，並利用通以高電壓之方法在不鏽鋼濾網間產生電場，收集空氣中之帶電微粒。
本研究在慣性收集板上設計導油道，將過濾後的油滴聚集並排出，在過濾流速45 cm/s下能過濾氣膠粒徑6 μm以上之油霧微粒達50%，並利用在不鏽鋼濾網上通以高電壓之方式，收集小於6 μm之油霧微粒。以通高壓電之不鏽鋼濾網與接地不鏽鋼濾交叉排列，並在濾網間產生電場收集油霧，此時電場大小、交叉排列層數、過濾流速與濾網結構皆為影響過濾效率之重要參數。本研究最終使用具有1.4 kV/mm電場的正電與接地交叉排列之27層100目不鏽鋼濾網，在過濾流速為15 cm/s時，對電移動度粒徑大於50 nm之微粒有50%以上之過濾效率，對電移動度粒徑大於120 nm之微粒有70%以上之過濾效率，能有效的降低後端纖維濾材之油霧負載量，延長使用壽命，且所收集之油霧可自動收集，不需進行不鏽鋼濾網更換。

Fine particulate matter (PM2.5) is a critical and imperative problem in Asia. It has been classified as the 1A carcinogen by The United Nations International Agency for Research on Cancer (IARC). According to the latest TEDS 9.0 (Taiwan Emission Data System 9.0), it shows that oil mist emissions from restaurants account for 6.39% of the total PM2.5 emissions in 2013. This ratio is even higher than power supply industries that only contributes 3.64％ of total emission. For housewives who do not smoke in Taiwan, their risk to develop lung cancer can increase by 3.2% to 12.2% through a long term exposure of oil mist at high temperature. Therefore, an effectively control to oil mist emissions is a very important task nowadays
However, common commercial fiber-based filters can be quickly masked by oil mist and are needed to be replaced frequently. In order to prolong the lifetime of the fiber filter, an inertial impactor plate and stainless steel mesh filter are used in this paper. They are less likely to clog when filtering oil mist and oils can be directed for collection by design of oil trenches. Furthermore, a high voltage stainless steel mesh array with a high electric field are also introduced to collect charged particles in the air for long term usage.
For the impactor developed in this study, liquid channels are designed in the inertial impactor plate, and the filtered oil droplets are collected and drained in the channel. At the flow rate of 45 cm/s, the oil mist with aerodynamic diameter larger than 6 μm can be filtered. For the particles smaller than aerodynamic diameter of 6 μm can be captured by the multi-layered high-voltage electrostatic mesh filter. A high electric field is applied to the multi-layered mesh filter for improving filtration efficiency. Parameters include the electric field, the number of filter layers, the filtration flow rate and the filter structure. Finally, we developed a 27-layer 100-mesh stainless steel filter driven under 1.4 kV/mm electric field with the optimal performance. At a filtration flow rate of 15 cm/s, the filtration efficiency of particles with particle size larger than 50 nm is above 50%, and the filtration of particles with particle size larger than 120 nm reached 70%. This method provides means to reduce the oil mist loading on the back fiber filter and prolong its lifetime for long term usage.

口試委員審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖目錄 vii
表目錄 xi
第1章 緒論 1
1.1 研究背景與動機 1
1.2 研究目的 2
1.3 研究架構 3
第2章 文獻回顧 4
2.1 分離微粒與氣體之基本機制 4
2.2 慣性衝擊收集原理 4
2.3 濾材過濾時之沉積狀態 6
2.4 電場收集理論文獻回顧 8
2.4.1 靜電集塵器 8
2.4.2 微粒充電 9
2.4.3 電暈放電 10
2.4.4 波茲曼帶電平衡 11
2.4.5 帶電微粒在電場中之運動情形 13
第3章 實驗方法與系統架設 15
3.1 過濾材料 15
3.1.1 不鏽鋼濾網 15
3.1.2 疏油塗料與不鏽鋼濾網接觸角測試 17
3.2 實驗設計 17
3.2.1 實驗設計架構 17
3.2.2 慣性衝擊板 18
3.2.3 不鏽鋼濾網過濾油霧 21
3.3 濾材品質與量測系統架設 26
3.3.1 濾材品質 26
3.3.2 濾材量測系統架設 28
第4章 結果與討論 36
4.1 慣性衝擊板 36
4.1.1 過濾流速對於穿透率之影響 36
4.1.2 負載油霧之壓降與重量討論 37
4.2 不鏽鋼濾網過濾油霧 39
4.2.1 不鏽鋼濾網目數對於過濾效率之影響 39
4.2.2 塗佈疏油層之不鏽鋼濾網 40
4.2.3 不同排列角度對過濾效率之影響 42
4.2.4 過濾流速對於不鏽鋼濾網過濾效率之影響 43
4.2.5 負載油霧之壓降與重量討論 44
4.3 不鏽鋼濾網加電場系統 47
4.3.1 電場強度對於過濾效率之影響 47
4.3.2 不同纖維直徑與孔隙率的高壓濾網對過濾效率之影響 47
4.3.3 過濾流速及摺形結構濾網對於過濾效率之影響 50
4.3.4 不同層數對過濾效率之影響 54
4.3.5 總合電場強度、濾網層數之討論 55
4.3.6 不鏽鋼靜電濾網對帶電微粒之過濾效率 58
4.4 廚房油霧過濾器 59
第5章 結論與未來展望 61
5.1 結論 61
5.2 未來展望 62
REFERENCE 63

[1]C. A. Pope III et al., "Lung cancer, cardiopulmonary mortality, and long-term exposure to fine particulate air pollution," Jama, vol. 287, no. 9, pp.1132-1141, 2002.
[2]Ko, Ying-Chin, et al. "Chinese food cooking and lung cancer in women nonsmokers." American journal of epidemiology 151.2 (2000): pp.140-147.
[3]Contal, P., Simao, J., Thomas, D., Frising, T., Callé, S., Appert-Collin, J. C., & Bémer, D. (2004). Clogging of fibre filters by submicron droplets. Phenomena and influence of operating conditions. Journal of Aerosol Science, 35(2), pp.263-278.
[4]Buonanno, G., Morawska, L., & Stabile, L. (2009). Particle emission factors during cooking activities. Atmospheric Environment, 43(20), pp.3235-3242.
[5]Hinds, W. C. (1999). Aerosol technology: Properties, behavior, and measurement of airborne particles, John Willey & Sons. Inc., New York, 1st edition, pp.191-198.
[6]Thakur, R., Das, D., & Das, A. (2013). Electret air filters. Separation & Purification Reviews, 42(2), pp.87-129.
[7]Kulkarni, P., Baron, P. A., & Willeke, K. (Eds.). (2011). Aerosol measurement: principles, techniques, and applications. John Wiley & Sons, 3rd edition, New York, United states of America, 2011, pp. 393-417.
[8]Kampa, D., Wurster, S., Buzengeiger, J., Meyer, J., & Kasper, G. (2014). Pressure drop and liquid transport through coalescence filter media used for oil mist filtration. International Journal of Multiphase Flow, 58, pp.313-324
[9]Chen, F., Ji, Z., & Qi, Q. (2018). Effect of pore size and layers on filtration performance of coalescing filters with different wettabilities. Separation and Purification Technology, 201, pp.71-78.
[10]Becker, Kurt, W. Zhu, and J. Lopez. "Microplasmas: Environmental and biological applications." Encyclopedia on plasma technology. Taylor and Francis Inc., 2015, pp.791-802.
[11]Fuliful, F. K., & Hamood, A. A. (2017). Collection Efficiency of Wire-Duct Electrostatic Precipitator. LAP Lambert Academic Publishing, 1st edition, pp.39-53
[12]Licht, W. (1988). Air pollution control engineering: Basic calculations for particulate collection (Vol. 10). CRC Press, 2nd edition, pp.331-368.
[13]Chang, J. S., Lawless, P. A., & Yamamoto, T. (1991). Corona discharge processes. IEEE Transactions on plasma science, 19(6), pp.1152-1166.
[14]Chen, J., & Davidson, J. H. (2003). Model of the negative DC corona plasma: comparison to the positive DC corona plasma. Plasma chemistry and plasma processing, 23(1), pp.83-102.
[15]Hartman, R. P. A., Borra, J. P., Brunner, D. J., Marijnissen, J. C. M., & Scarlett, B. (1999). The evolution of electrohydrodynamic sprays produced in the cone-jet mode, a physical model. Journal of Electrostatics, 47(3), pp.143-170.
[16]Liu, B. Y., & Pui, D. Y. (1974). Equilibrium bipolar charge distribution of aerosols. Journal of Colloid and Interface Science, 49(2), pp.305-312.
[17]夏炳均. (2005). 濾油器的選用與清洗方法. 煤礦機械, 26(12), pp.145-146.