博碩士論文 90323070 詳細資訊




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姓名 杜威達(Wei-Da Tu)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 二維流動式顆粒床過濾器內部配置設計研究
(Research and Development of the 2-D GBF Configuration)
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摘要(中) 流動式顆粒床可用來進行高溫氣體過濾,是發展先進燃煤發電技術或生質能氣化燃燒系統中之重要元件。流動式顆粒床技術發展瓶頸在於過濾床質亦於燃氣進出口葉片間形成滯留區,而導致系統堵塞。解決方案之一為在顆粒床中加入流動校正單元(Flow Corrective Element)。濾材床質之流動性質量測為設計流動式顆粒床葉片與流動校正單元之重要參數。本篇論文以直接剪力測試儀器精密量測實際濾材石英砂之流動性質,包括內摩擦角及其與壁面之摩擦角,並加以分析床質之流動函數與床質/葉片系統之流動因子,從而設計顆粒床流動校正單元配置,並且藉由一套二維過濾顆粒床模型,並搭配不同類型的流動校正單元設計,探討不同流動校正單元對濾材顆粒於顆粒床流動的影響,並且求得可有效消除濾材滯留區之最佳顆粒床配置設計。
摘要(英) Granular moving bed filters and absorbers (GM-BF/A) for hot gas cleanup continue to be developed as a key component of current integrated gasification combined cycle (IGCC) and advanced pressurized fluidized bed combustion (PFBC) power generation systems. The main difficulty in employing this technology is the existence of residential areas of filter granules. The placement of flow corrective elements based on the flow properties is proposed as a good solution to diminish the residential areas. The measurements of flow properties, including the pure sand and the mixture of sand and fly ash are described. Meanwhile, the specific flow function and the flow factor of filter media derived from the flow properties will be evaluated as well to design the louver systems according to different requirements, then observing and analyzing the flow patterns in two-dimensional experimental apparatus to define the optimum louver-flow corrective element configuration.
關鍵字(中) ★ 流動函數
★ 流動因子
★ 摩擦角
★ 流動校正單元
★ 滯留區
★ 流動式顆粒床
關鍵字(英) ★ flow factor
★ flow function
★ angle of friction
★ flow corrective element
★ residential area
★ granular moving bed filters
論文目次 摘要……………………………………………………………………….I
Abstract…………………………………………………………………II
附圖目錄….…………………………………………………………….VI
附表目錄….…………………………………………………………….IX
符號說明……..………………………………………………………….X
第一章 前言……………………………………………………………..1
1.1 研究背景………………………………………………………….1
1.2 研究目的………………………………………………………….6
第二章 研究對象與設備…………………………………….…………11
2.1 研究對象……………………………………………….……...11
2.2 研究設備………………………………………………………....11
2.2.1 直接剪力測試儀器………………………………………….11
2.2.2 研究模擬系統……………………………………………….15
2.2.3 觀測與量測設備…………………………………………….22
第三章 研究方法……………………………………………………….23
3.1 流動性質測量步驟……………………………………………..23
3.1.1 整體密度(ρb)……………………………………………23
3.1.2 璧面摩擦角(f’) ……………………………………….23
3.1.3 內部摩擦角(f)……………………………………….….24
3.2 相關理論介紹…………………………………………………..26
3.2.1 莫爾半圓(Mohr’s circle)…………………………….27
3.2.2 內聚力(Cohesion)……………………………………….28
3.2.3自由降伏強度(Unconfined yield strength fc)………29
3.2.4 流動因子(Flow factor,ff)……………………………29
3.2.5 流動函數(Flow function,FF)…………………………30
3.2.6 有效降伏曲線(Effective yield locus,EYL)與有效
摩擦角(Effective angle of friction, δ)……….32
3.3 繪製並整理數據的方法………………………………………..32
3.3.1 壁面摩擦角降伏曲線(Wall yield locus,WYL)………32
3.3.2 內部摩擦角之降伏曲線…………………………………….34
3.3.3 流動函數…………………………………………………….38
3.3.4 流場開口寬度……………………………………………….38
3.4 二維流場現象研究步驟………………………………………..39
3.4.1 放置流動校正單元………………………………………….39
3.4.2 控制質量流率……………………………………………….39
3.4.3 置入追蹤粒子……………………………………………….40
3.4.4 攝影紀錄…………………………………………………….40
3.4.5 後續影像處理……………………………………………….41
第四章 流動性質測量結果與討論…………………………………….42
4.1 整體密度………………………………………………………..42
4.2 壁面摩擦角……………………………………………………..42
4.3 內部摩擦角……………………………………………………..45
4.4 流動函數………………………………………………………..50
4.5 開口寬度………………………………………………………..51
第五章 二維流場觀測結果與討論…………………………………….52
5.1 對稱型無流動校正單元………………………………………..52
5.2 對稱型有流動校正單元………………………………………..52
5.2.1 理論位置…………………………………………………….52
5.2.2 上移10 mm…………………………………………………..53
5.2.3 上移20 mm…………………………………………………..53
5.2.4 上移30 mm…………………………………………………..54
5.2.5 上移40 mm…………………………………………………..54
5.3 對稱型分離式流動校正單元…………………………………..63
5.3.1 理論位置…………………………………………………….63
5.3.2 上移30 mm…………………………………………………..64
5.4 非對稱型無流動校正單元……………………………………..69
第六章 結論…………………………………………………………….74
參考文獻………………………………………………………………..76
附錄 A 對稱型流動校正單元...………………………………………80
附錄 B 對稱型分離式流動校正單元..……………………………….83
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指導教授 蕭述三(Shu-San Hsiau) 審核日期 2003-6-25
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