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題名 | 小型固態廢棄物焚化爐之流場分析=Simulating the Flow Field for Small Solid Incinerator |
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作者姓名(中文) | 吳中興; 陳康興; | 書刊名 | 農業工程學報 |
卷期 | 46:2 2000.06[民89.06] |
頁次 | 頁45-53 |
分類號 | 445.545 |
關鍵詞 | 紊流; 固態廢棄物; 焚化爐; 流場模擬; Turbulent flow; Solid waste; Waste paper; Incinerator; Flow-field simulation; |
語文 | 中文(Chinese) |
中文摘要 | 由於我國經濟發展之腳步快速,每日所產生之固態廢棄物亦大量增加。固態廢棄物中含有許多廚餘,水份含量甚高。利用焚化法來處理農業廢棄物已被認為是一可行的方式,因此使用焚化廠來處理固態廢棄物,已逐漸成為先進國家發展之趨勢。有鑑於焚化爐設計需要,本文將利用有限元素法的計算流體力學軟體FIDAP,於個人電腦(PC)上,建立焚化爐二維紊流場的模擬程式。並以實際運作的小型固態廢棄物焚化爐為例,進行二維流場之分析模擬,並且於固定一次助燃空氣進氣量時,比較不同二次助燃空氣進氣量對於流場的影響。結果成功地於PC上建立模擬程式。對於不同二次助燃空氣進氣量的分析結果,顯示二次助燃空氣將使迴流區擴大而增進爐內之混合效果。但愈大的二次助燃空氣進氣量,將使二次燃燒室產生更大的衍生迴流區,而影響二次燃燒室的燃燒效果。因此小於15%的二次助燃空氣進氣量將是較佳的設計選擇。 |
英文摘要 | Owing to the rapid growth in our national economy, each city produces a lot of waste that contains a large portion of food waste. Since thermal degradation is considered as a good method to handle the agricultural waste, using an incinerator to treat the solid waste has been becoming a tendency in some developed countries. To meet the requirement of incinerator design, a simulative program to predict the turbulent flow field using a CFD package, FIDAP, by means of the finite element method is established on PC. The two-dimensional flow field inside an existing incinerator is analyzed. Furthermore, when the primary air flow rate is fixed, the effects coming from the alternations in the secondary air flow rate are studied. Computational results show that the secondary air will extend the recirculation zone to improve the mixing effect of the combustion chamber. On the other hand the derived recirculating region will be introduced in the secondary combustion chamber while further increasing the secondary air flow rate, and this will have contrary effects. Considering the design purpose, it can be concluded that the ratio of the secondary auxiliary air to total auxiliary air supplied should be lower than 15%. |
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