1-02　The effect of plastic volatile matters on soot formation reaction during co-gasification of coal and plastics under entrained flow gasification condition

Abstract

CRIEPI is developing the poly-generation system with entrained-flow gasifier. In this system, we expect to utilize plastic wastes as fuels in addition to coal. In our previous study, it was found that the aromatic rings of soot were developed by adding refuse derived paper and plastics densified fuel (RPF) to coal during the pyrolysis at 1400°C. In this study, another plastic sample (polypropylene, PP) which had no oxygen contents was added to coal. Char, soot, and gas yields and the aromatic rings of soot were analyzed during pyrolysis and CO₂ gasification. Soot yield during co-pyrolysis and co-gasification of coal and PP was higher than RPF, which was caused by the less oxygen contents. The development of the aromatic rings induced by the hydrogen abstraction C₂H₂ addition (HACA) mechanism was inhibited by the consumption of plastic volatile matters with the oxygen contents of plastics and gasifying agents.