本研究建立了一個三維暫態數值模型，模擬轉爐製程導入輪胎之燃燒現象。模型中使用k-ε紊流模型搭配Finite-rate/eddy-dissipation燃燒模型，並將輪胎塊擬合成球狀，以DPM(Discrete phase model)離散相模型投料入轉爐中，以及考慮頂底吹氧氣至鐵水的脫碳反應與二次燃燒反應。
研究結果發現輪胎塊在高溫下裂解時，裂解速率會快速達到穩定，且在整個過程幾乎維持定值。在輪胎塊的投料參數分析上，其模擬結果顯示當輪胎塊尺寸越大，裂解時間增加，使揮發物有更充足時間燃燒，其揮發物破壞去除(DRE)效率會些微增加；而當提升輪胎總質量，裂解時間也增加，但因裂解量增多，會使破壞去除效率降低。此外，當鐵水對頂吹氧槍的氧氣消耗比例增加時，轉爐內的氧氣量會減少導致燃燒反應降低，使輪胎塊裂解時間增長，破壞去除效率也降低。本研究中也比較了輪胎塊在鐵水表面分布差異以及不同紊流模式，對模擬結果的影響。
本研究成功模擬出導入輪胎轉爐製程之燃燒現象，有助於設計廢輪胎在轉爐製程的投料策略。其投料策略以高破壞去除效率考量，建議增加輪胎塊尺寸及增加頂吹氧氣於轉爐中的比例；若以快速消耗廢輪胎考量，建議減少輪胎塊尺寸及每次投料之質量。

In this study, a transient 3-D numerical model is built to investigate the tire burning in a furnace. In this study, the turbulence k-ε model and the combustion finite-rate/eddy-dissipation model are used to simulate the tire burning in hot furnace. The batch of tyre pieces is tossed in the furnace by using the discrete phase model (DPM) with spherical shape.
In this study, it is found that the pyrolysis rate of a tyre piece will quickly reach a certain rate and maintain constant in a hot furnace of high temperatures. The simulation results show that the pyrolysis time and the destruction and removal efficiency(DRE) increase with the size of tire. In addition, the pyrolysis time increases with the increase in the mass of tire, but DRE decreases. The more consumed amount of top-injection oxygen by liquid iron cause less oxygen in the furnace, and consequently, results in less combustion heat release and longer pyrolysis time of tyre pieces. Furthermore, the influences of the distribution of tyre pieces and different turbulence models were also investigated in this study.
This study has successfully simulated the phenomena of tyre burning process in a hot furnace and the simulation results can be used to design a batch-feeding tactic for waste tyre. It is suggested that to use large tyre pieces and reduce the oxygen consumption by liquid iron for high DRE. On the other hand, to reduce pyrolysis time for a batch of tyre, the suggestion is to decrease the batch-feeding mass and tyre size.

論文審定書 i
誌謝 ii
摘要 iv
Abstract v
目錄 vi
圖目錄 ix
表目錄 xii
符號說明 xiii
第1章 序論 1
1.1 前言 1
1.2 文獻回顧 3
1.3 研究目的 6
1.4 本文架構 7
第2章 研究方法與數值模型 8
2.1 研究方法 8
2.2 模型介紹 8
2.3 統御方程式 12
2.3.1 標準k-ε模型傳輸方程(Two-equation model) 14
2.3.2 Finite-rate/Eddy-dissipation模型 15
2.4 Discrete Phase Model(DPM)模型 17
2.4.1 輪胎粒能量平衡 19
2.5 裂解與燃燒反應 21
2.5.1 裂解反應 21
2.5.2 燃燒反應 22
2.6 氧氣接觸鐵水消耗部份氧氣現象 24
2.7 網格建立 25
2.8 邊界條件 26
2.9 揮發物破壞去除效率(DRE) 27
第3章 結果與討論 28
3.1 單顆及大量輪胎塊模擬結果 28
3.1.1 單顆輪胎塊裂解時間 28
3.1.2 大量投料裂解現象 29
3.2 大量投料基準參數模擬結果 36
3.2.1 流場現象 38
3.2.2 氧氣接觸鐵水部份消耗之現象 44
3.2.3 二次燃燒 45
3.2.4 不同投料分佈方式比較 51
3.2.5 不同模型流場比較 56
3.3 參數比較 61
3.3.1 輪胎塊尺寸 61
3.3.2 輪胎塊總質量 64
3.3.3 鐵水對頂吹氧槍之氧氣消耗現象 67
3.3.4 曲面擬合 70
第4章 結論 73
第5章 未來展望 75
參考文獻 76
附錄 80
方型轉爐建立 80
模擬結果 81
揮發物高度 81
流場現象 83
UDF(user defined function) 90

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