Plug Flow Reactor 모델을 이용한 폐플라스틱의 열분해 특성 해석
Analysis on the Pyrolysis Characteristics of Waste Plastics Using Plug Flow Reactor Model
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The pyrolysis characteristics of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene(PP) were analyzed numerically using a 1D plug flow reactor (PFR) model. A lumped kinetic model was selected to simplify thepyrolysis products as wax, oil, and gas. The simulation was performed in the 400-600°C range, and the plastic pyrolysis and productgeneration characteristics with respect to time were compared at various temperatures. It was found that plastic pyrolysis acceleratesrapidly as the temperature rises. The amounts of the pyrolysis products wax and oil increase and then decrease with time, whereas theamount of gas produced increases continuously. In LDPE pyrolysis, the pyrolysis time was longer than that observed for other plasticsat a specified temperature, and the amount of wax generated was the greatest. The maximum mass fraction of oil was obtained in theorder of HDPE, PP, and LDPE at a specified temperature, and it decreased with temperature. Although the 1D model adopted in thisstudy has a limitation in that it does not include material transport and heat transfer phenomena, the qualitative results presented hereincould provide base data regarding various types of plastic pyrolysis to predict the product characteristics. These results can in turn beused when designing pyrolysis reactors.
Abstract
The pyrolysis characteristics of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene(PP) were analyzed numerically using a 1D plug flow reactor (PFR) model. A lumped kinetic model was selected to simplify thepyrolysis products as wax, oil, and gas. The simulation was performed in the 400-600°C range, and the plastic pyrolysis and productgeneration characteristics with respect to time were compared at various temperatures. It was found that plastic pyrolysis acceleratesrapidly as the temperature rises. The amounts of the pyrolysis products wax and oil increase and then decrease with time, whereas theamount of gas produced increases continuously. In LDPE pyrolysis, the pyrolysis time was longer than that observed for other plasticsat a specified temperature, and the amount of wax generated was the greatest. The maximum mass fraction of oil was obtained in theorder of HDPE, PP, and LDPE at a specified temperature, and it decreased with temperature. Although the 1D model adopted in thisstudy has a limitation in that it does not include material transport and heat transfer phenomena, the qualitative results presented hereincould provide base data regarding various types of plastic pyrolysis to predict the product characteristics. These results can in turn beused when designing pyrolysis reactors.
참고문헌 (33)
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