二維移動顆粒床濾池兩階段模式下的速度場分析

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Nugroho Aji(Aji Nugroho) 查詢紙本館藏

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能源工程研究所

論文名稱

二維移動顆粒床濾池兩階段模式下的速度場分析
(Analysis of velocity fields in a two-stage mode of three-dimensional moving granular bed filter)

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摘要(中)

發電廠和許多工廠的粉塵廢氣長期污染空氣，危害人類健康。這個問題引起了全世界的嚴重關注。為了解決它，已經提出了許多過濾技術。作為一種很有前途的過濾技術，移動式顆粒床過濾器（MGBF）具有簡單，高效，低成本和耐高壓的優點，已廣泛用於具有復雜成分的高溫煙氣的過濾。為了使刷新的砂過濾優化，兩種顆粒的大小在一過濾容器中已被研究。由於一個被設計的流動校正單元，使由粗及細組成的矽砂獲得停滯區最小化。顆粒床過濾器設計的幾何形狀會極大地影響應力分佈。過濾床中的應力分佈可通過流動型態研究方法進行研究。先前的研究進行了可顯示停滯區域的流動型態。然而，基於這種設計理論的兩種尺寸的過濾顆粒質量流量容器的應力分佈尚未在三維MGBF上進行研究。在這項研究中，將介紹不同質量流率下的速度分佈和水平速度分佈。評估了在三維交錯流中移動式顆粒床過濾器的流動型態，以獲得顆粒床過濾器中矽砂流動的速度分佈。在粗砂和細砂中建造追踪層以獲得清晰的流動型態結果。這些流動型態測試受到粗砂和細砂質量流率差異的影響。由於不同的質量流量配置，結果發現了不同的現象。研究結果表明，兩級過濾的最佳設計可降低粗砂和細砂的質量流量至330 g/min。

摘要(英)

The dusty exhaust gases from power plants and many industrial plants pollute the air chronically and endanger human health. This problem gained serious concern all over the world. Numerous filtration advances have been investigated in order to deal with it. As a reliable filtration innovation, the Moving Granular Bed Filter (MGBF) has been broadly utilized within the filtration of high-temperature flue gas with complex chemical structures with its focal points of straightforwardness, high effectiveness, economical friendly, and good pressure resistance. Two granular sizes in a channel have been researched in order to optimize refreshed sand filtering. The flow-corrective insert has been designed to pass through the two types of silica grains consisted of coarse sand and fine sands to get a minimized stagnant zone. The geometry of the bed filter design greatly affects the stress distribution. The stress distribution in a filter bed can be investigated by means of flow pattern investigation. Previous research conducted a flow pattern study that can show a stagnant zone. Nevertheless, the stress distribution from this design theory of two sizes filter granules mass flow vessel has not investigated on three-dimensional MGBF. In this study, velocity profiles and horizontal velocity distribution in different mass flow rates will be presented. The flow patterns in a three-dimensional cross-flow moving granular bed filter were evaluated in order to get the velocity profile of the sand flow in a bed filter. Tracing layers in both coarse and fine sand were constructed to obtain clear flow pattern results. These flow pattern tests were influenced by the difference in mass flow rates in both coarse and fine sand. The results found different phenomena due to different mass flow rate configurations. The findings revealed that the optimal design for two-stage filtration diminished the mass flow rate of 330 g/min for both coarse sand and fine sand.

關鍵字(中)

★ 三維移動式顆粒床過濾器
★ 兩級過濾
★ 流動型態
★ 速度分佈
★ 水平速度分佈
★ 垂直速度分佈

關鍵字(英)

★ three-dimensional moving granular bed filter
★ two-stage filtration
★ flow pattern
★ velocity profile
★ horizontal velocity distribution
★ vertical velocity distribution

論文目次

National Central University Authorization of Thesis i
Advisor Recommendation of Graduate Student ii
Verification Letter from Oral Examination Committee iii
摘要 iv
Abstract v
Acknowledgements vi
Content vii
List of Figures ix
List of Tables xii
List of Symbols and Abbreviations xiii
Chapter 1 Introduction 1
1.1 Overview 1
1.2 Research Motivation 3
Chapter 2 Theoretical Background and Literature Review 7
2.1 Basic principle of GBF 7
2.2 Classification of GBF 7
2.3 Filtration mechanism of GBF 9
2.4 Experimental study on the performance of GBF 11
2.5 Bulk solid properties 14
2.5.1 Normal and Shear Stresses acting within the Bulk Solid 15
2.5.2 Mohr Stress Circle 16
2.5.3 bulk solid properties for the assessment of stresses 18
2.6 Stresses distribution in a bed filter 22
2.6.1 Janssen’s investigations on stresses in a silo’s vertical section 22
2.6.2 Janssen’s approach 23
2.6.3 Stresses in the vertical section of a silo 25
2.6.4 Loads on the walls of the vertical section 26
2.6.5 Deformationloflthelbulklsolidlinlthe bed filter 27
2.6.6 Stresses distribution in a bed filter 30
2.6.7 Flow corrective insertlinlverticallsectionloflrectangular bed 33
Chapter 3 Experimental Overview 35
3.1 Apparatus and Materials 35
3.2 Experimental Procedure 38
3.3 Velocity fields analysing 39
3.4 Horizontal and vertical velocity distribution analysing 40
Chapter 4 Results and Discussion 42
4.1 Flow pattern results 42
4.2 Velocity field profiles in different mass flow rates 53
4.3 Horizontal and vertical velocity distribution 56
4.3.1 Horizontal velocity distribution on different mass flow rate 56
4.3.2 Comparison of vertical velocity distribution in a different height of a bed filter 62
4.3.3 Comparison of horizontal velocity distribution in a different height of a bed filter 62
4.4 Analyses of the inclination between coarse and fine sand in two-stage bed filter 65
Chapter 5 Conclusion and Outlook 67
References 69
Appendix: Velocity vector data 78

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指導教授

蕭述三(Shu-San Hsiau)

審核日期

2021-1-26

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