鄭福田2006-07-262018-06-282006-07-262018-06-282005-07-31http://ntur.lib.ntu.edu.tw//handle/246246/22164本研究利用自行開發之可控制粒徑分布型態之奈米微粒產生系統，以提供奈米氣懸 微粒計畫應用此套奈米微粒產生系統於奈米微粒之負載以探討奈米微粒粒徑分佈對負 載造成之影響。本研究主要方法是利用靜電噴霧氣膠產生器為液體霧化式單一粒徑奈米 微粒產生設備之特性，將其液體進料系統改裝為可程式控制之混合進料系統，噴霧產生 濃度不同之單一粒徑液滴，其後液滴乾燥後即留下具備多重粒徑分布型態之奈米微粒。 由於奈米微粒在環境中之粒數雖多，但是其質量比例極小，利用本套儀器能產生穩定且 高濃度之奈米微粒之特性，不僅可以提供為奈米微粒負載特性之研究，可控制粒徑奈米 微粒之產製，更提供特定粒徑分布之微粒負載與單一粒徑微粒負載之差異比較之研究。 研究結果顯示單一粒徑奈米微粒之負載時，由於粒徑愈小之微粒形成之濾餅孔隙越 小，在相同質量之負載下其壓損越大，而在微米粒徑微粒負載之壓損與微粒總表面積成 正比之結果在奈米粒徑微粒仍然有相同之趨勢。呈雙峰分布奈米微粒之負載測試，當小 微粒之數目濃度低於大微粒時，壓損曲線與較大微粒所單獨形成之濾餅之壓損曲線接 近。呈雙峰分布奈米微粒之負載測試，當小微粒之數目濃度高於大微粒時，壓損曲線與 較小微粒所單獨形成之濾餅之壓損曲線接近，推測其原因在於大微粒所形成之濾餅空隙 是否完全被小粒徑微粒佔滿是造成相同質量負載下壓損差異之原因。Filtration is a convenient and popular way in collection particles from gas stream. It is a effective way in both micron sized particle as well as nanoparticle by different mechanism. Collection efficiency and pressure drop are the major concerns in applying filter.While micron sized particle loading of filter were studied by some researchers, nanoparticle loading was not studied before. A nanoparticle generator composed of Electrospray aerosol generatorwas developed to generate a stable aerosol source which size distribution was controllable. The aerosol generator could supply as high as 106#/cm3 to speed up loading test. It was utilized to generate both monodispersed and bi-modal distribution challenge aerosol in membrane filter loading test. In this work, a PVC membrane filter with 5 μm pore was used in evaluating the pressure drop versus particle loading. The loading curve of monodispersed nanoparticle showed that smaller particle made pressure drop build up more than bigger particle under equal loading mass. The pressure drop ratio was closed to the ratio of total surface area of particles, alike to micron sized particle loading by other researchers. The loading curve of bimodal distributions showed different results.When number concentration of smaller mode particle was lower than larger mode, the pressure-loading curve was close to larger particle. But when number concentration of smaller mode particle was higher than larger mode, the pressure-loading curve was close to smaller particle. This could be explained by whether the void of larger particle cake was fully filled of smaller particles or not.application/pdf483350 bytesapplication/pdfzh-TW國立臺灣大學環境工程學研究所奈米氣膠電噴霧式氣膠產生器粒徑分布微粒負載薄膜過濾nanoparticleElectrospraybimodal size distributionaerosol loadingmembrane filtrationreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/22164/1/932621Z002001.pdf