2017 Volume 96 Issue 1 Pages 28-33
Waste plastic pellets are one of important materials as an alternative fuel to COG (Coke Oven Gas) in CaCO3 calcination furnaces. However, the amount of waste plastic is limited. So possibility of waste wood utilization was investigated and the pellets combining waste plastic and waste wood were developed. To clarify the combustion behavior of the pellets, a lab-scale test and a commercial furnace injection test were conducted. The burn-out time at 1000 ℃ of combined pellets (6 mmφ), with ratios of 10, 20 and 30wt% waste wood, was around 25 s. This time was the same as that for conventional waste plastic pellets. The combined pellets with a ratio of 10wt% waste wood were injected into a commercially operating calcination furnace. The amount of heat input from COG and combined pellets was reduced by 5% as compared with that of COG alone. This result was the same as that for conventional waste plastic pellets. This effect was caused by combustion of the pellets close to CaCO3 in the calcination furnace. These results show that combined pellets with a ratio of 10wt% of waste wood can be used as an alternative fuel to COG as conventional waste plastic pellets.
