Experimental study on the relationships between composition distribution and laminar flame speed of pyrolysis products

Experiments are performed to determine the effects of composition distribution on the laminar flame speeds of various pyrolysis products. The compositions of the pyrolysis gases are found to be the same, with hydrogen, methane, and ethylene comprising the majority. However, the compositions of the pyrolysis liquids are quite different under various cracking conditions. The C-10-C-12 cycloalkanes and alkanes account for the majority of the composition when the conversion rate is relatively low (<= 0.072), while the C-6-C-8 aromatics and alkenes gradually become the dominant species with an increase in the conversion rate. Experimental results show that the laminar flame speeds of different pyrolysis gases (or different pyrolysis liquids) have a few discrepancies, although the pyrolysis conditions are quite different. However, the laminar flame speeds of different pyrolysis products show significant differences, which are found to be related to both the pyrolysis gas content and the properties of the pyrolysis liquids. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.