郭景宗臺灣大學：機械工程學研究所李信璋Li, Hsin-ChangHsin-ChangLi2007-11-282018-06-282007-11-282018-06-282005http://ntur.lib.ntu.edu.tw//handle/246246/61262高溫高壓的操作條件下，燒煤發電和焚化技術中，集塵效率是很重要的，高溫過濾應用在工業上的例子也不少，可見是一門很重要的學問，此實驗在研究帶粉塵的流體經過顆粒床的收集效率，實驗中各種各樣的參數是由粒徑和過濾速度組成，透過衝擊器及壓降的變化來得知集塵效率在該操作條件下的優劣，實驗中可明顯觀察出受溫度的影響並針對常溫效率來比較，整個濾床變髒時，可發現流場分布有顯著的改變，導致中間部分過濾器濾床處的粉塵沉積物在出口端有阻塞效應，收集效率如預期的趨勢隨時間增加，在高過濾速度下，依濾材顆粒粒徑大小決定，由於粉塵的再次進入收集效率可能隨著時間下降。Particulate collection at high temperature and high pressure is important in coal power generation system and incinerate technology. The application of filtrations at high temperature in industry is very usual. The filtration of dust-laden gas in a cross flow granular bed filter was investigated by experiments. The parameters varied in the experiments were the granule size and filtration velocity. Filtration efficiency was decided by cascade impactor. The influence of temperature change was clearly observed and the system efficiency was compared with room temperature condition. When the bed became dirty, a marked change in flow distribution was observed on the outlet side of the filter panel due to the blocking effect of dust deposits around the central section of the granular bed filter. The particle collection efficiencies showed the expected trend of increasing with time. At higher filtration velocities, dependent upon the size of the filter granules, the collection efficiency may decrease with time due to dust re-entrainment.目錄 中文摘要……………………………………………………………………I 第一章 緒論………………………………………………........1 1-1前言……………………………………………………………….1 1-2研究動機…………………………………………………....…3 1-3文獻回顧…….……………………………………………………4 1-4研究目的….…………………..……………………………..13 第二章 微粒收集理論………………….……………………………...16 2-1顆粒床過濾器對微粒之收集機制…………………………...16 2-2影響收集效率之因素整合.…………………………..……..21 2-3顆粒床過濾器之壓降分析..............................26 2-4採樣器系統-衝擊器之原理分析……………………….…….28 第三章 實驗設備與步驟…………………………………………………32 3-1實驗設備…………………………………………………………32 3-2實驗原理與方法…………………………………………………44 3-2-1粉塵供料系統設計………………………………………44 3-2-2採樣系統設計……………………………………………46 3-2-3高溫顆粒床過濾系統設計………………………………48 3-3實驗步驟…………………………………………………………49 3-3-1濾材與粉塵的特性量測...........................49 3-3-2粉塵供料器與串式衝擊器測試…………………………51 3-3-3流道及流場穩定測試…………………………………52 3-3-4冷卻系統測試……………………………………………53 3-3-5顆粒床之淨化氣體效率量測……………………………53 第四章 實驗結果與討論…………………………………………………55 4-1實驗操作結果……………………………………………………55 4-2濾材對顆粒床壓降之影響……………………...……………55 4-3濾材對衝擊採樣器粉塵分佈之影響……………………………58 4-3-1粉塵濃度分析……………………………………………58 4-3-2衝擊器內各層重量與常溫狀況下比較分析……………59 4-4流場各部分模擬分析……………………………………………63 第五章 結論與建議………………………………………………………72 參考文獻…………………………………………………………………75 附錄A-實驗設備圖………………………………………………………84 附錄B-實驗前後濾材外觀的變化………………………………………873750127 bytesapplication/pdfen-US顆粒床高溫粉塵過濾granular bed filterhigh temperaturedust filtrationthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/61262/1/ntu-94-R92522320-1.pdf