2012 Volume 91 Issue 3 Pages 219-225
Comparison of combustion and gasification behavior of waste plastics with pulverized coal in blast furnace is necessary to increase the replacement rate of waste plastics to coal. The combustion and gasification behavior of these materials were observed by use of raceway hot model which simulated the lower part of blast furnace. Moreover, the reactivity of unburned char derived from these materials generated from raceway was estimated. The experimental results showed that the size of waste plastics with the same combustion and gasification efficiency of pulverized coal was almost 1 mm. CO2 gasification rate of unburned char derived form pulverized plastics with the size of less than 1.2 mm was similar to that of pulverized coal with the size of less than 0.1 mm. Thus, it was concluded that pulverized plastics with the size of less than 1.2 mm was completely consumed in the blast furnace, and furthermore, was effectively utilized as a reducing agent. On the basis of above results, the pulverized waste plastics recycling system was designed.
