Pyrolysis Kinetics Study of Auto Shredder Residue Using Thermal Gravimetric Analysis

[[abstract]]摘要 廢機動車輛經粉碎處理後，約會產生20~30%之非金屬物質，這些物質通稱 為「廢機動車輛粉碎殘餘物」(Auto Shredder Residue，簡稱ASR)。我國廢車回收 數量具逐年增加之大致趨勢，可以預期ASR 之產量亦將隨之增加，然而國內現 行的處理方法大多以焚化為主，但是焚化對於環境的影響仍存在釵h問題，較佳 的解決方法，不外乎是有效之回收再利用。近年來能源短缺問題逐漸浮上檯面， 因此廢棄物的資源化，更值得探討，而熱裂解正好兼具廢棄物資源化及能源化之 雙重效益。惟有關ASR 熱裂解之相關研究較少，動力學方面的探討更是鳳毛麟 角。因此，本研究之目的，即在探討ASR 各組成之裂解行為，以及推估ASR 之 熱裂解模式，本研究將ASR 分為泡棉、聚合物、木材、纖維、紙類、及其他等 六大類，使用熱重分析儀(TGA)，設定三種升溫速率：5℃/min、10℃/min、15℃ /min，在氮氣環境下進行分析。實驗結果顯示，ASR 中的木材、纖維呈現一階段 反應；泡棉、紙類、聚合物呈現兩階段反應；ASR 呈現三階段反應。以Friedman 和Ozawa 法所求得之活化能數值相近，故以Friedman 法所求得的動力學參數進 行模擬，結果顯示以ASR 之六大類組成所計算之熱裂解速率曲線(dx/dt vs T)與實 驗值具頗佳之一致性，其R2 在三種升溫速率下分別為0 7971、0 9339、0 8538， 模式的適用性良好。[[abstract]]ABSTRACT There were 20~30% non-metal material had been produced after abandoned automobile vehicle though the shredding process which is called Auto Shredder Residue It is predictable that the amount of ASR will increase following the growth of the recycled automobile year by year Incineration is the current way of auto disposal yet it causes many problems and influences the environment One of the better resolutions is reuse The shortage of resources has been the main issue in these years Thus it is worthwhile to study on how to make good use of the waste Pyrolysis possesses multiple efficiency which like waste transform into resource and energy Due to the lack of studies on ASR Pyrolysis and rarer kinetics the purpose of this study is to discuss pyrolysis behavior of components of ASR and compute the model of ASR pyrolysis In this study ASR is being divided into 6 groups： foam polymer wood fiber paper and others and using thermal gravimetric analysis (TGA) Analysis conditions will be set in three kind of heating rates: 5℃/min、10℃/min、 15℃/min and in full nitrogen state The result of the experiment shows that the woods and fiber present one stage reaction the foam paper and polymer present two stage reaction ASR presents three stage reaction Activation energy values computed by Friedman method and Ozawa method are approximative so parameters of kinetics which is computed by Friedman method will be going to simulate The result shows that the rate curve (dx/dt vs T) computed by ASR composed of 6 groups are in accordance with experimental values The coefficients of determination R2 are 0 7971、0 9339、0 8538 and it represents the model possesses satisfactory applicabilit