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題名 | 增進重力沉降室效率之方法研究=Study for Increasing the Efficiency of Gravity Settlers |
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作 者 | 吳中興; 李志萍; | 書刊名 | 農業工程學報 |
卷期 | 44:4 1998.12[民87.12] |
頁次 | 頁105-112 |
分類號 | 434.25 |
關鍵詞 | 重力沉降室; 集塵棚架; 計算流體力學; 有限元素分析法; Gravity settlers; Collecting-shelf; CFD; FEM; |
語文 | 中文(Chinese) |
中文摘要 | 重力沉降室是製造業及農產加工業常見的前級處理集塵設備之一,其工作原理為 利用截面突張的效果,使含塵氣流的速度減慢,粉塵受到重力的影響而沉降,達成收集塵粒 之目的。重力沉降室的構造簡單、價格便宜、容易維修,對於較大粒徑的粉塵能有效的捕集 ,因此適合做為空氣污染防治的前處理設備。 為了增進重力沉降室的集塵效率,可在沉降室的底部加掛集塵棚架,以幫助塵粒的沉降 。本文以計算流體力學軟體FIDAP有限元素分析法,模擬集塵棚架安置於三種不同位置時 ,對重力沉降室內流場的影響,依據數值模擬的結果進行比較分析。三種不同的位置分別為 :安置集塵棚架於重力沉降室的左邊;安置集塵棚架於重力沉降室的中間;安置集塵棚架於 重力沉降室的右邊。 依據分析的結果得知,集塵棚架於不同的位置時,皆能提高重力沉降室的集塵效率,然 而以安置於中間時效率最高,安置於右邊或左邊時,集塵效率較低。因此,安置集塵棚架於 重力沉降室中間,為最適當的位置。 |
英文摘要 | Gravity settler is one kind of dust collectors which can be applied in the industry as well as in agriculture as a selected equipment in the air pollution control system, since it is characterized by simple shape, low price and easy maintenance. The working principle is when the gas stream passes through the expansion chamber, the flow velocity will be reduced owing to the expansion effect and gravity force. Therefore, the particles carried by the gas stream will be settled down on the bottom of the gravity settler. Since the collecting efficiency is more significant for larger particles, gravity settlers. Since the collecting efficiency is more significant for larger particles, gravity settlers are suitable for the pre-processing purpose for the dust-laden air stream. For increasing the collecting efficiency of gravity settlers, the collecting-shelf should be assembled beneath the bottom of the gravity settler. This research adopted Computational Fluid Dynamics(CFD) software FIDAP, which is based on the Finite Element Method(FEM), to simulate the flow field for three types of gravity settlers whose collecting-shelf is located at the left position, in the middle position, and at the right position, respectively. The results reveal that a collecting-shelf will improve the performance of the gravity settler. When it is mounted in the middle of the settler attaining the highest efficiency on removing particles. Other arrangements, in which the collecting-shelf is located in the right or in the left, are not so significant for the efficiency improvement. |
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