英文計畫名稱：Assessment of converting waste plastic label and aluminum foil package to fuel via thermal treatment technology
英文摘要關鍵詞：Wasted plastic label、Waste aluminum foil package、Pyrolysis、Economic Evaluation
本研究採用氣泡式流體化床快速熱裂解的方式來處理廢塑膠標籤以及廢鋁箔包。本研究在前期完成廢塑膠標籤及廢鋁箔包的料源選擇並經過造粒製成廢棄物衍生燃料(densified Refuse Derived Fuel, RDF-5)及完成料源性質分析。廢塑膠標籤以及廢鋁箔包衍生塑膜透過三成分分析來分析可燃份、灰份及水分的組成；透過元素分析來判斷料源的可能主要成分，如廢塑膠標籤由元素分析結果判定其主要成分為PET而廢鋁箔包衍生塑膜主要成分則為為PE；藉由熱重損失分析(Thermogravimetric analysis，TGA)來量測適合操作的裂解溫度；最後由熱值分析來判斷此料源是否適合作為替代補助燃料。分析結果顯示，廢塑膠標籤的平均乾基發熱量約為6,690 kcal/kg；廢鋁箔包衍生塑膜約為7,895 kcal/kg，兩者的高熱值均適合用來做為替代燃料。
廢塑膠標籤於20 kg/hr流體化床快速裂解先導系統中，進行7次測試，裂解油產量低並且有設備堵塞的情況，推測由於主要成分PET在裂解時會產生苯甲酸晶體，其苯環結構如同焦油一樣易造成流體化床裂解反應器中床砂黏結以及設備的堵塞，故廢塑膠標籤並不適合做為裂解系統的進料料源；廢鋁箔包衍生塑膜則進行2次裂解測試，裂解油產油率約在54wt.%左右。兩種料源均於200 kg/hr「氣泡式流體化床快速裂解準商業化系統」中驗證，其結果與先導系統結果相仿。廢鋁箔包塑膜裂解所產製的裂解油，經過鍋爐混燒測試發現裂解油其熱值與柴油相當，約在9,800 kcal/kg，燃燒後尾氣濃度與柴油相當，均可符合環保法規。由裂解系統的經濟可行性評估可知裂解製程在適當情境下具經濟可行性。
This study used fast pyrolysis in bubbling fluidized bed(BFB) to process waste plastic labels and aluminum foil packages. In the previous stage, the suitable waste plastic label and the waste aluminum foil package were selected and granulated to make densified Refuse Derived Fuel (RDF-5) and the properties were analyzed. Proximate analysis was conducted to analyze the composition of the combustible, ash and moisture portion, while elemental analysis was used to determine the main components of the feedstock. The results showed that PET was the main component of the waste plastic labels as long as PE was the major component in the waste aluminum foil package. The Thermogravimetric analysis (TGA) was performed to find the proper pyrolysis temperature. The calorific value analysis was to determine whether this feed was suitable as an alternative subsidy fuel. The analysis results showed that both waste plastic label and aluminum foil package were with high calorific value around 6,690 and 7,895 kcal/kg respectively in dry basis and both were suitable for alternative fuel.
The waste plastic label had been tested for 7 times on the 20 kg/hr plateform, and the results showed the oil production was low and equipment was clogged. It was speculated that the main component of pyrolysis product of PET woud be benzoic acid crystals, and the molecule structure of benzoic acid was just like tar, which causes equipment blockage. Therefore, the waste plastic label was not suitable as the pyrolysis system feedstock. The waste aluminium foil had been tested for 2 times on the 200 kg/hr plateform, and the pyrolysis oil yield of these two was around 54 wt.%. The pyrolysis oil was also tested via a boiler, co-firing with diesel. The results showed that the pyrolysis oil has a calorific value of 9,800 kcal/kg and comparable to the diesel fuel. The flue gas composition after combustion was also similar to that of diesel fuel, and could meet the environmental regulations. The economic feasibility assessment of the pyrolysis system showed that the process is economically feasibile under certain conditions.