| 英文摘要 |
Rigid polyurethane foam (PUR) from waste refrigerators has very limited disposal solutions due to its low density and high heating value. According to international research and papers, current approaches to recycle waste PUR include mechanical, chemical, and energy recovery. Since PUR collected from waste refrigerators consists of a mixture of plastics and metals, it cannot be recycled directly.
The aim of this project is therefore to design and develop a system for separating PUR from the waste mixture, and to integrate the different available technologies to achieve a PUR purity of 95%, which would allow further recycling processing and realize circular economy opportunities, as well as to prevent pollution. Three different separation technologies were examined to identify the most suitable and efficienct technique for waste PUR separation. Based on the results, a separation system was designed to include two prodcution lines, each capable of treating 1 tonne of waste PUR per hour, with the annaul capacity of 4,000 tonnes. Finally, the sorted and purified PUR was used as a filler to evaluate the performance of the recycled foaming material, and two kinds of foam materials with different densities were prepared. It was confirmed that the recycled foam material by adding 10% waste PUR was technically feasible, and the compressive strength of the recycled foam material produced was equivalent to that of the new foam. In conclusion, if waste PUR can be properly recycled and reused in the future, it is expected that the recycling rate of waste refrigerators will increase from the current 83.6% to 94.6%.
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