請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85817
完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳志傑(Chih-Chieh Chen) | |
dc.contributor.advisor | 陳志傑(Chih-Chieh Chen | ccchen@ntu.edu.tw | ), | |
dc.contributor.author | Han-Sheng Huang | en |
dc.contributor.author | 黃瀚陞 | zh_TW |
dc.date.accessioned | 2023-03-19T23:25:18Z | - |
dc.date.copyright | 2022-10-20 | |
dc.date.issued | 2022 | |
dc.date.submitted | 2022-09-29 | |
dc.identifier.citation | Aguiar, M. and Coury, J. (1996). Cake Formation in Fabric Filtration of Gases. Industrial & engineering chemistry research 35: 3673-3679. Chen, C.-C., Chen, W.-Y., Huang, S.-H., Lin, W.-Y., Kuo, Y.-M. and Jeng, F.-T. (2001). Experimental Study on the Loading Characteristics of Needlefelt Filters with Micrometer-Sized Monodisperse Aerosols. Aerosol Science & Technology 34: 262-273. Chen, C.-C. and Willeke, K. (1992). Aerosol Penetration through Surgical Masks. American journal of infection control 20: 177-184. Chen, Y.-S. and Hsiau, S.-S. (2009). Cake Formation and Growth in Cake Filtration. Powder Technology 192: 217-224. Cheng, Y.-H. and Tsai, C.-J. (1998). Factors Influencing Pressure Drop through a Dust Cake During Filtration. Aerosol Science and Technology 29: 315-328. Covert, D., Wiedensohler, A. and Russell, L. (1997). Particle Charging and Transmission Efficiencies of Aerosol Charge Neutralizes. Aerosol Science and Technology 27: 206-214. Darcy, H. (1856). Les Fontaines Publiques De La Ville De Dijon: Exposition Et Application Des Principes ð Suivre Et Des Formules ð Employer Dans Les Questions De Distribution D'eau: Ouvrage Terminé Par Un Appendice Relatif Aux Fournitures D'eau De Plusieurs Villes, Au Filtrage Des Eaux Et ð La Fabrication Des Tuyaux De Fonte, De Plomb, De Tôle Et De Bitume. V. Dalmont. Davies, C.N. (1973). Air Filtration. Academic Press. Endo, Y., Chen, D.-R. and Pui, D.Y. (1998a). Bimodal Aerosol Loading and Dust Cake Formation on Air Filters. Filtration & separation 35: 191-195. Endo, Y., Chen, D.-R. and Pui, D.Y. (1998b). Effects of Particle Polydispersity and Shape Factor During Dust Cake Loading on Air Filters. Powder technology 98: 241-249. Fuchs, N. and Stutugin, A. (1966). Aerosol Science, Edited by Cn Davies, Academic Press, London. Gal, E., Tardos, G. and Pfeffer, R. (1985). A Study of Inertial Effects in Granular Bed Filtration. AIChE journal 31: 1093-1104. Gupta, A., Novick, V.J., Biswas, P. and Monson, P.R. (1993). Effect of Humidity and Particle Hygroscopicity on the Mass Loading Capacity of High Efficiency Particulate Air (Hepa) Filters. Aerosol Science and Technology 19: 94-107. Happel, J. (1958). Viscous Flow in Multiparticle Systems: Slow Motion of Fluids Relative to Beds of Spherical Particles. AIChE journal 4: 197-201. Hinds, W.C. (1999). Aerosol Technology: Properties, Behavior, and Measurement of Airborne Particles. John Wiley & Sons. Hsu, C.-W., Huang, S.-H., Lin, C.-W., Hsiao, T.-C., Lin, W.-Y. and Chen, C.-C. (2014). An Experimental Study on Performance Improvement of the Stairmand Cyclone Design. Aerosol and Air Quality Research 14: 1003-1016. Huang, S.-H., Chen, C.-W., Kuo, Y.-M., Lai, C.-Y., McKay, R. and Chen, C.-C. (2013). Factors Affecting Filter Penetration and Quality Factor of Particulate Respirators. Aerosol and Air Quality Research 13: 162-171. Huang, S.-H., Kuo, Y.-M., Chang, K.-N., Chen, Y.-K., Lin, W.-Y., Lin, W.-Y. and Chen, C.-C. (2010). Experimental Study on the Effect of Fiber Orientation on Filter Quality. Aerosol Science and Technology 44: 964-971. Hutten, I.M. (2007). Handbook of Nonwoven Filter Media. Elsevier. Japuntich, D., Stenhouse, J. and Liu, B. (1994). Experimental Results of Solid Monodisperse Particle Clogging of Fibrous Filters. Journal of aerosol science 25: 385-393. Japuntich, D., Stenhouse, J. and Liu, B. (1997). Effective Pore Diameter and Monodisperse Particle Clogging of Fibrous Filters. Journal of Aerosol Science 28: 147-158. Kuo, Y.-M., Huang, S.-H., Lin, W.-Y., Hsiao, M.-F. and Chen, C.-C. (2010). Filtration and Loading Characteristics of Granular Bed Filters. Journal of aerosol science 41: 223-229. Lathrache, R. and Fissan, H. (1987). Enhancement of Particle Deposition in Filters Due to Electrostatic Effects. Filtration & separation 24: 418-422. Lee, K. and Liu, B. (1982). Theoretical Study of Aerosol Filtration by Fibrous Filters. Aerosol science and technology 1: 147-161. Liu, B.Y. and Pui, D.Y. (1974). Equilibrium Bipolar Charge Distribution of Aerosols. Journal of Colloid and Interface Science 49: 305-312. Muskat, M. (1938). The Flow of Homogeneous Fluids through Porous Media. Soil Science 46: 169. Mussatti, D.C. (2002). The Epa Air Pollution Control Cost Manual, Sixth ed. Natanson, G. (1957). Deposition of Aerosol Particles on a Circuiar Cylinder by the Action of Electrostatic Attraction, In Dokl. Akad. Nauk SSSR, pp. 696-699. Rudnick, S. and First, M. (1978). Specific Resistance (K2) of Filter Dust Cakes: Comparison of Theory and Experiments, In Third Symposium on Fabric Filters for Particulate Collection, EPA-600/7-78-087, pp. 251-288. Schmidt, E. and Löffler, F. (1990). Preparation of Dust Cakes for Microscopic Examination. Powder technology 60: 173-177. Tardos, G.I. (1997). Granular Bed Filters, In Handbook of Powder Science & Technology, Springer, pp. 771-780. Yeh, H.-C. and Liu, B.Y. (1974). Aerosol Filtration by Fibrous Filters—I. Theoretical. Journal of aerosol science 5: 191-204. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85817 | - |
dc.description.abstract | 粉餅是袋式集塵器的運作過程中被收集於濾袋上的氣膠微粒之總稱,它的累積將導致系統壓降的快速上升,因此在實務上往往視之為應被去除的物質。然而若從另一個面向來看,粉餅的出現其實有助於提升氣膠微粒的過濾效率,本研究的出發點就在於將粉餅視為一種濾材,針對其過濾特性做一完整探討。此處引入了過濾品質這項參數作為評估指標,它在物理意義上代表的是濾材在單位壓降下所能提供的氣膠微粒過濾效率。 本研究的目標有二,一是找出在何種條件之下可以生成具有最高過濾品質的粉餅,二是嘗試套用單一纖維過濾理論以預測粉餅的氣膠微粒穿透率和過濾品質。為了達到上述目的,本研究建立了一套可以穩定產生微米等級氣膠微粒的負載系統 (單一粒徑分布),在一塊材質堅硬的玻璃燒結濾材上生成粉餅。定量輸出霧化器與微粒電移動度掃瞄分徑器的組合則被用於產生與量測次微米等級的氣膠微粒 (多粒徑分布),藉以進行粉餅的穿透率實驗。粉餅的壓降與厚度則使用壓力傳感器和位移感測器逐秒進行量測。整體實驗將在10和90%的相對濕度下進行,調整參數包括負載微粒帶電量 (0、7.5×10-6、1.1×10-5和1.45×10-5 C/m2)、表面風速 (2、5、10和20 cm/s)、填充密度 (0.233、0.299和0.399) 和負載微粒粒徑 (5、15和30 μm),另外亦將探討針孔形成對於粉餅過濾特性的影響。必須注意的是,本研究的實驗結果都是以累積至20 mg/cm2的粉餅作為比較基準。 根據實驗結果,粉餅帶電將使靜電吸引的過濾機制增強,進而降低粉餅的穿透率,而且由於同極電荷互斥的影響,粉餅將堆積出較為疏鬆的結構而使壓降下降,因此在粉餅過濾品質的提升上有著雙重效益。針孔的出現對於粉餅的穿透率則沒有顯著影響,不過由於壓降提高,粉餅的過濾品質曲線呈現下降的趨勢,本研究根據此實驗結果判斷,針孔應是氣流與氣膠無法通過之處,也就是說,針孔的出現將使得粉餅的過濾面積減小,因此造成過濾風速提高,並最終導致粉餅壓降的增加。表面風速的影響則可以分為兩個層面進行探討,第一部分透過實驗手段將粉餅的填充密度固定為0.399,接著操作表面風速至10、5和2 cm/s分別進行粉餅的穿透率實驗,根據結果,粉餅的過濾品質曲線將隨表面風速下降而提升,這主要得益於粉餅壓降和穿透率的同時下降。第二部分則在表面風速固定為2 cm/s的情況下,對填充密度為0.399、0.299和0.233的三塊粉餅分別進行穿透率實驗,結果顯示,粉餅的過濾品質曲線將隨填充密度減小而提升,這是因為結構疏鬆的粉餅具有較低的壓降所致。負載微粒粒徑減小將顯著提升粉餅的過濾品質,這是因為過濾挑戰氣膠的行為發生於負載微粒的表面,而在相同的累積重量下,小粒徑的微粒所提供的表面積理應較大,因此粉餅的穿透率也就越低。本研究同時驗證了單一纖維過濾理論在粉餅穿透率和過濾品質預測上的可行性,透過在擴散與攔截過濾機制的公式當中加入Kuwabara hydrodynamic factor這項參數來修正流場條件,可以將單一纖維過濾理論改寫成適用於粉餅的版本。 | zh_TW |
dc.description.abstract | Dust cake is responsible for the collection of aerosols during the operation of baghouse, but also undesirable due to the significant increase of pressure drop when it builds up. Considering dust cake as a kind of air filter, the objectives of this study were to find out in which conditions the dust cake with the best filter quality could be produced and to apply the single-fiber theory to predict the filtration characteristics of dust cake. Monodisperse PMMA spheres were used to form the dust cake on a sintered glass filter. The combination of a constant output atomizer and a scanning mobility particle sizer was used to generate and measure sub-micron aerosols, so as to carry out the penetration test of dust cake. A pressure transducer and a displacement meter were used to measure the pressure drop and thickness of filter cake. The whole experiment would be conducted at 10% and 90% relative humidity. The experimental parameters included charge density (0, 7.5×10-6, 1.1×10-5, and 1.45×10-5 C/m2), surface velocity (2, 5, 10, and 20 cm/s), packing density (0.233, 0.299, and 0.399), and loaded particle size (5, 15, and 30 μm). The effect of pinhole formation would also be investigated. It must be noted that the dust cake was always accumulated to the weight of 20 mg/cm2 in subsequent discussions. According to the experimental results, the electrification of dust cake would enhance the filtration mechanism of electrostatic attraction, thereby reducing the penetration of dust cake. And also the dust cake would accumulate to a looser structure, due to the mutual repulsion of the same polar charges on the loaded particles. The above two reasons would both improve the filter quality of dust cake. The formation of pinholes did not affect the penetration of dust cake. However, due to the increase in pressure drop, the filter quality of dust cake would decrease. It was speculated that the airflow and aerosols might not pass through pinholes based on the results. In other words, pinholes would reduce the filtration area of dust cake, which led to an increase in filtration velocity and thus make the pressure drop increase. The influence of surface velocity should be discussed in two situations. In the first part, the packing density of dust cake was fixed at 0.399, and the penetration was measured under the surface velocity of 10, 5, and 2 cm/s, respectively. The results showed that the filter quality curve would be improved as the surface velocity decreased, which was due to the simultaneous decrease of the pressure drop and penetration of dust cake. In the second part, the surface velocity was fixed at 2 cm/s, and the penetration of dust cake with packing densities of 0.399, 0.299, and 0.233 was evaluated. The results showed that the filter quality of dust cake would increase as the packing density decreased, due to the lower pressure drop resulting from the loose-structured dust cake. The reduction of loaded particle size would significantly improve the filter quality of dust cake. This was because the collection behavior of challenge aerosols occurred on the surface of loaded particles. For the same accumulated weight, small particles should provide a larger surface area and thus lead to the decrease of penetration of dust cake. The single-fiber theory was validated in the prediction of penetration and filter quality of dust cake. By adding Kuwabara hydrodynamic factor to the formulas of the diffusion and interception filtration mechanisms, the single-fiber theory was modified to suit the operating situation of dust cake. | en |
dc.description.provenance | Made available in DSpace on 2023-03-19T23:25:18Z (GMT). No. of bitstreams: 1 U0001-2909202211291800.pdf: 1548231 bytes, checksum: 4cd103e7365756075bcaa6d5540836e0 (MD5) Previous issue date: 2022 | en |
dc.description.tableofcontents | 口試委員會審定書 i 誌謝 ii 中文摘要 iv Abstract vi 目錄 ix 表目錄 xi 圖目錄 xii 第一章、研究背景 1 1.1 研究動機 1 1.2 研究目的 1 第二章、文獻探討 3 2.1 氣膠微粒負載特性 3 2.1.1 粉餅形成點前:濾袋表面處理 3 2.1.2 粉餅形成點後:粉餅壓降預測 4 2.1.3 粉餅厚度量測 7 2.2 氣膠微粒過濾機制 8 2.2.1 單一圓球過濾理論 (single-sphere theory) 9 2.2.2 單一纖維過濾理論 (single-fiber theory) 10 第三章、研究方法 14 3.1 實驗設計 14 3.2 實驗系統 14 3.2.1 氣膠微粒負載系統 15 3.2.2 氣膠微粒穿透率量測系統 17 第四章、結果與討論 19 4.1 相對濕度與氣膠微粒帶電 19 4.2 針孔現象 21 4.3 表面風速與填充密度 21 4.4 氣膠微粒粒徑 24 第五章、結論與建議 26 參考文獻 28 | |
dc.language.iso | zh-TW | |
dc.title | 粉餅過濾特性研究 | zh_TW |
dc.title | Filtration Characteristics of Dust Cake | en |
dc.type | Thesis | |
dc.date.schoolyear | 110-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林文印(Wen-Yinn Lin),黃盛修(Sheng-Hsiu Huang),蕭大智(Ta-Chih Hsiao),林志威(Chih-Wei Lin) | |
dc.subject.keyword | 粉餅,袋式集塵器,過濾品質,單一纖維過濾理論,填充密度,針孔現象, | zh_TW |
dc.subject.keyword | dust cake,baghouse,filter quality,single-fiber theory,packing density,pinhole effect, | en |
dc.relation.page | 51 | |
dc.identifier.doi | 10.6342/NTU202204224 | |
dc.rights.note | 同意授權(全球公開) | |
dc.date.accepted | 2022-09-29 | |
dc.contributor.author-college | 公共衛生學院 | zh_TW |
dc.contributor.author-dept | 環境與職業健康科學研究所 | zh_TW |
dc.date.embargo-lift | 2024-09-29 | - |
顯示於系所單位: | 環境與職業健康科學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
U0001-2909202211291800.pdf 此日期後於網路公開 2024-09-29 | 1.51 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。