2-03　Numerical Estimation of Tar and Soot Formation in Coal and Plastic Co-gasification

Abstract

Since aromatic tar is produced from coal and aliphatic tar from plastics in pyrolysis, a large number of chemical species and chemical reactions must be considered to evaluate tar and soot in co-gasification of coal and plastics. To overcome this issue, this study developed a reduced reaction model that treats tar and soot as hypothetical chemical species and considers these reactions in the global reaction model. Using the developed reaction model, CFD simulation of a gasifier, called reductor simulating gasifier, was performed. The results showed that tar is produced by pyrolysis and then consumed by chemical reactions. Soot is formed from tar and then consumed by gasification reaction, but it remains until the outlet of the gas-fired furnace compared to tar. The developed reaction model can be used to evaluate the behavior of tar and soot in co-gasification of coal and plastics.