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姓名 沐漢(Mohanraj Ramasamy) 查詢紙本館藏 畢業系所 機械工程學系 論文名稱 有效分離不同形狀和大小的固體固體材料之滾筒式
(Effective separation of solid –solid materials in different shape and size using trommel screen)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 為在分離兩種不同尺寸形狀和密度的固體 - 固體混合材料時能有更
好的篩分效率，進行了一項實驗研究。轉筒篩分機由六角旋轉滾筒
和堅實外框架組成，其中篩網固定在旋轉滾筒的六個壁面上，這樣
當進料在旋轉滾筒的軸向向下螺旋前進時便可以分離。實驗是以5個
不同的旋轉滾筒速度進行，旋轉滾筒具有7個不同的傾斜角度，進料
材料以5個不同質量流速進入旋轉滾筒內部。篩分效率是根據料斗內
小於篩網孔徑的材料量和其篩分過程後收集的篩下量來計算。實驗
結果顯示，篩分效率隨著旋轉滾筒轉速的增加而增加，在33和29.5
rpm轉速下，分離出小於篩網孔徑的材料（矽砂）與大於篩網孔徑
的材料（圓形鋁片）的效率較高，這是由於顆粒在旋轉滾筒內部的
激流型運動( cataracting motion )。而顆粒在較低速度18 rpm下的傾
流型運動( slumping motion )導致在旋轉滾筒的較低速度下效率較低
。在較小的傾斜角度2.7°和5°，篩分效率可達98％左右，這是由於
進料在旋轉滾筒內的停留時間較長，當角度增加時效率降低，顆粒
趨於在旋轉滾筒軸向上快速滑過。顆粒物理特性，如進料之間的巨
大尺寸差異和密度參數，也對篩分效率有所影響，當進料到旋轉滾
筒中的進料量的質量流量增加時，效率降低。因為在旋轉滾筒口附
近存在堵塞效應並且使顆粒撞擊旋轉滾筒的表面，累積的厚度增加
因此效率降低。在旋轉滾筒21.5和18 rpm的較低速度搭配較高質量
流速320和400 g/min時效率較差，較低進料的質量流速80 和160
g/min搭配較高轉轉速29.5和33rpm，且旋轉滾筒的傾斜角度小時，
可以更好地完成工作。摘要(英) An experimental study in the trommel screen was conducted in order to find the better screening efficiency in separating two dissimilar solid -solid materials in terms of size shape and density. The trommel machine consists of a hexagonal rotating drum with solid outside frame in which the sieve is fixed on the six sides of the rotatory drum, so that the feed material can be separated when the feed material spirals down over the length of the rotating drum, the experiments were carried with 5 different speed of the rotating drum, 7 different inclinations angle of the rotating drum with 5 different mass flow rates of the feed material entering into the drum. The screening efficiency is calculated based on the amount of undersize material inside the hopper to the amount of undersize collected after the screening process. The experimental results are shown that the screening efficiency is increased with increased in rotational speed of the drum, at higher speed 33 and 29.5 rpm the efficiency in separating the undersized material (silica sand) from the oversized material (alumina coins) is higher, this is due to the cataracting motion of the particle inside the drum, whereas the slumping motion of the particles at the lower speeds 18 rpm causes the lesser efficiency at lower speed of the rotating drum. The screening efficiency is higher above well around 98% at the smaller angles at 2.7°and 5°of inclination of the drum, due to the larger residence time of the feed material inside the rotating drum, when the angle is increased the efficiency is decreased, the particles tends to slide over the length of the drum rapidly, the particles physical characteristics such as vast size difference among the feed materials and density parameters affects also has influence in screening efficiency. When the mass flow rate of the feed materials into the drum is increased the efficiency is decreased due to the fact that there is clogging effect near the entry of the drum and which makes the particles to hit surface of the rotating drum, the packing thickness increased so the efficiency is decreased, at higher mass flow rates 320 and 400 g/min at lower speeds of the rotating drum 21.5 and 18 rpm the efficiency is poor, lower mass flow rates of the feed material 80 and 160 g/min with higher rotational speeds 29.5 and 33 rpm of the drum with small angle of inclination of the drum has the better efficiency in achieving the task 關鍵字(中) ★ 滾筒篩
★ 篩分效率
★ 傾角
★ 旋轉滾筒速度關鍵字(英) 論文目次 Contents
Chinese Abstract III
English Abstract V
Contents VII
List of figures IX
List of tables X
Chapter 1 Introduction 1
1.1 Screening and its importance 1
1.2 Importance of material screening in recycling industry 1
1.3 Objective of the Thesis 2
1.4 General outline of the thesis 4
1.5 Literature review and Background 4
1.5.1 Screening 5
1.5.2 Suitability of the Mechanical equipment for achieving the task. 11
1.5.3 Factors affecting screening Efficiency 13
1.5.4 Effect of Rotational speed of the drum on screening efficiency 14
1.5.5 Effect of deck inclination angle on screening efficiency 14
1.5.6 Effect of shape and size of feed mixture 15
1.5.7 Effect of Mass flow rate 15
1.5.8 Effect of aperture shape and size in screening efficiency 16
Chapter 2 Experimental setup and operation Methodology 18
2.1 Feed material Information 19
2.2 Major factors affecting the screening efficiency in the Trommel screen 20
2.2.1 Speed of the rotating drum 21
2.2.2 Aperture shapes 21
2.2.3 Screen perforated plate design 22
2.2.4 Inclination angle of the rotating drum 23
2.2.5 Flow rates of the feed materials inside the drum 23
2.3 Operational parameters for the experiments 24
2.4 Experimental methodology 25
2.5 Definition for the screening Efficiency 26
Chapter 3 Results and discussion 28
3.1 Screening efficiency Under Different Mass flow rates 29
3.1.1 Mass flow rate of 80 grams/min 29
3.1.2 Mass flow rate of 160 grams/min 32
3.2 Screening efficiency Under Higher Mass flow rates 37
3.2.1 Mass flow rate of 240 grams/min 38
3.2.2 Mass flow rate of 320grams/min 40
3.2.3 Mass flow rate of 400 grams/min 41
3.3 Comparative study: Screening Efficiency vs Different Mass flow rates when the Angle of Inclination of the drum is fixed 47
3.4 Screening Efficiency at different angles vs Different Mass flow rates when the rotational speed of the drum is fixed 51
3.4.1 When the rotational drum speed 33 rpm is fixed 54
3.4.2 When the rotational drum speed 29.5 rpm is fixed 54
3.4.3 When the rotational drum speed 25.5 rpm is fixed 55
3.4.4 When the rotational drum speed 21.5 rpm is fixed 55
3.4.5 When the rotational drum speed 18 rpm is fixed 56
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30) Scott, D.M., Cheah, J.F., Sim, D.E., Chua, C., Gummow, J.G., Lam, B.P.M., Reder, I., 2009. Transient granular flows in an inclined rotating cylinder: filling and emptying. Ind. Eng. Chem. Res. 48, 159e165.指導教授 蕭述三(Shu-San Hsiau) 審核日期 2019-1-31 推文 plurk
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