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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳志傑(Chih-Chieh Chen) | |
| dc.contributor.author | Chun-Ting Li | en |
| dc.contributor.author | 李俊霆 | zh_TW |
| dc.date.accessioned | 2021-07-11T14:53:51Z | - |
| dc.date.available | 2023-08-04 | |
| dc.date.copyright | 2020-09-10 | |
| dc.date.issued | 2020 | |
| dc.date.submitted | 2020-07-17 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/78377 | - |
| dc.description.abstract | 旋風器(cyclone)是在執行排放管道中細懸浮微粒(PM2.5)採樣時經常被使用的 前置分徑器。由於各排放管道的排氣溫度存在相當大的差異，因此，本研究透過 實驗的方法，探討入口氣流溫度對旋風器的分徑效率、空氣阻抗的影響。 研究中利用超音波霧化器產生微米多粒徑分布的 NaCl 微粒，並搭配氣動粒徑 分析儀(APS)即時監測微粒粒徑與數目濃度的變化。微粒經乾淨空氣的稀釋乾燥與 帶電中和之後，由 APS 與抽氣裝置之組合主動吸取一定流率的空氣樣本進入旋風 器。在旋風器入口前設有加熱裝置以調整氣體的溫度(25 ~ 200 °C );在出口端則 利用冰浴裝置先把氣體溫度降至常溫後再以 APS 進行採樣分析。旋風器的外層以 保溫棉包覆，並在入、出口端設置壓力測定孔。 結果顯示，當溫度由25 °C增加至200 °C時，需增加氣體的質量流率才能使旋 風器的初始分徑效率維持不變(從 10.4 sLPM 提升至 10.46 sLPM)，此時由於氣體 速度(風速隨溫度而增加)與黏滯係數(黏滯度隨溫度而增加)的改變，使得旋風器的 空氣阻抗隨著溫度的提升而顯著增加(相同質量流率下，阻抗隨溫度增加而與溫度 的 0.26 次方呈現正相關)。史托克數會隨溫度升高而增加，透過增加史托克數的參 數來修正溫度的影響，將使史托克參數也能在不同溫度下使用。 美國環保署對於粒狀物的採樣規範中(Method 201A)，關於 PM10 與 PM2.5 在 25 °C的標準採樣流量為為 10.7 sLPM，而當溫度升高至 200 °C時，美國環保署的採 樣流量( 11.65 sLPM)明顯高於實驗值，從實驗室中所得到的結果說明，當溫度增 加時(25~200 °C)，體積採樣流率應該與溫度呈現正相關，並會因為溫度的增加而 增加些許標準採樣流量(200 °C時的標準採樣為 10.46 sLPM 比 25 °C增加 0.06 sLPM)。 | zh_TW |
| dc.description.abstract | This study presented a numerical result of gas-particle flow in cyclone separators. The results evaluated the performance of separators at different temperature, and analyzed the application of Stokes number when elevated temperature. In this study, micro NaCl particles would be generated by ultrasonic atomizer in multi-particle size distribution, and aerodynamic particulate sizer (APS) was used to monitor the changes in particle size and number concentration in real time. The freshly produced droplet particles were diluted, dried and neutralized by dilution air, and the certain flow rate of air sample was draw by APS and air extraction device into the cyclone. A heating device was installed in front of the cyclone inlet to adjust the temperature of the gas (25 ~ 200 °C). At the end of outlet, an ice bath device was used to cool down the gas to normal temperature before sampling from APS for sampling and analysis. The outer layer of the cyclone was covered with thermal insulation cotton, and pressure drop were measured from inlet and outlet of the cyclone. The results show that when the temperature was increased from 25 to 200 °C, the mass flow rate of the gas needed to be slightly increased to maintain the initial separation efficiency of the cyclone. Due to changed in gas velocity and viscosity coefficient, the pressure drop of cyclones significantly increased with increasing temperature. The Stokes number that expressed the separation efficiency of the particle diameter increased with increasing temperature. Therefore, the Stokes number can also be used at different temperatures. | en |
| dc.description.provenance | Made available in DSpace on 2021-07-11T14:53:51Z (GMT). No. of bitstreams: 1 U0001-1507202015325100.pdf: 5718582 bytes, checksum: b63a8e78daf3eda2a5b72b7f8441bf27 (MD5) Previous issue date: 2020 | en |
| dc.description.tableofcontents | 第一章、研究計畫之背景及目的 ............................................................................... 8 1.1 背景....................................................................................................................8 1.2 目的....................................................................................................................9 第二章、文獻探討 ....................................................................................................... 9 2.1 固定式污染源....................................................................................................9 2.2 抽取式顆粒物連續排放監測系統....................................................................9 2.3 微粒分徑器......................................................................................................10 2.3.1 雷諾數的變化與參數間的介紹...........................................................10 2.3.2 史托克數的變化與參數間的介紹.......................................................10 2.3.3 溫度對滑溜修正因子的變化與介紹...................................................11 2.3.4 慣性衝擊採樣器...................................................................................12 2.3.5 旋風式分徑採樣器...............................................................................12 2.4 溫度對分徑的影響..........................................................................................13 2.4.1 氣體密度、壓力的影響.......................................................................13 2.4.2 氣體黏滯度的影響...............................................................................14 第三章、研究方法 ..................................................................................................... 15 3.1 溫度對微粒分徑參式的影響..........................................................................15 3.1.1 溫度對雷諾數的影響............................................................................15 3.1.2 溫度對史托克數的影響.......................................................................15 3.1.3 溫度對滑溜修正因子的影響...............................................................16 3.2 實驗系統建立..................................................................................................16 3.2.1 標準微粒產生系統...............................................................................16 3.2.2 加熱控制設備.......................................................................................16 3.2.3 冰浴控制設備.......................................................................................17 3.2.4 微粒採樣...............................................................................................17 3.3 溫度對分徑器分徑效率與阻抗的影響..........................................................17 第四章、結果與討論 ................................................................................................. 17 4.1 溫度對微粒分徑參式的影響..........................................................................17 4.1.1 溫度對史托克數的影響.......................................................................17 4.1.2 溫度對雷諾數的影響...........................................................................19 4.1.3 溫度對滑溜修正係數的影響...............................................................19 4.2 溫度對分徑器採樣流率的影響......................................................................20 4.2.1 分徑效率影響.......................................................................................21 4.2.2 採樣流率的比較...................................................................................21 4.3 阻抗影響..........................................................................................................21 4.3.1 過濾品質...............................................................................................22 4 第五章、結論與建議 ................................................................................................. 22 第六章、參考文獻 ..................................................................................................... 23 | |
| dc.language.iso | zh-TW | |
| dc.subject | 旋風式分徑器 | zh_TW |
| dc.subject | 負載效應 | zh_TW |
| dc.subject | 高溫採樣 | zh_TW |
| dc.subject | 再懸浮 | zh_TW |
| dc.subject | 分徑曲線 | zh_TW |
| dc.subject | Loading effect | en |
| dc.subject | High temperature sampling | en |
| dc.subject | Cyclone separators | en |
| dc.subject | Resuspension | en |
| dc.subject | Separation curve | en |
| dc.title | 溫度對微粒分徑器截取粒徑的影響 | zh_TW |
| dc.title | Temperature effect on the cutoff size of aerosol separator | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 108-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 黃盛修(Sheng-Hsiu Huang),林志威(Chih-Wei Lin),林文印(Wen-Yin Lin),蕭大智(Ta-Chih Hsiao) | |
| dc.subject.keyword | 高溫採樣,旋風式分徑器,負載效應,再懸浮,分徑曲線, | zh_TW |
| dc.subject.keyword | High temperature sampling,Cyclone separators,Loading effect,Resuspension,Separation curve, | en |
| dc.relation.page | 82 | |
| dc.identifier.doi | 10.6342/NTU202001545 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2020-07-17 | |
| 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 | 2023-08-04 | - |
| 顯示於系所單位： | 環境與職業健康科學研究所 | |
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