Development of Thermal Recycle Technology for Wasted Insulating Material of Electric Power Cable

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In order to thermally recycle a wasted insulating material of electric power cable, which was made of cross-linked polyethylene (XLPE), the combustion properties and fundamental ignition/combustion characteristics were studied by using a thermogravimetric analyzer and an electrically heated drop furnace. The practical combustion behaviors were also tested by using a swirl flow turbulent combustor.From the thermobalance experiments, the combustion behavior of sample is divided into two stages. During the first stage the volatile matter evolves and burns around 500 K.Ih the second stage, on the other hand, the combustion of residual solid component takes place in the temperature range of 700-800 K.Regarding the fundamental ignition/combustion characteristics obtained by using the drop furnace, the particles sieved from 150 until 300 mum can burn at the lowest ignition temperature, and the fluctuation of ignition temperature becomes narrow. The detail combustion behavior was elucidated by measuring the components of released gas along the furnace axis during the combustion. Although low-grade hydrocarbonsand CO are produced in the upper stream of furnace, all of them diminish at the exit. Comparing the fundamental combustion behavior of the wasted material of cable coating with pulverized coals, the former can burn more easily than the latter.Based on the above-mentioned results, the wasted material was applied as the solid fuel to the swirling turbulent combustor. As a result, even the coarse particles ranged from 300 to 440 mum can burn completely. However, the larger particles ranged more than 500 mum cannot maintain the steady combustion. These results suggest that the wasted insulating material of electricpower cable can be applied worthily as one of practical solid fuels.