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

• Published in: International journal of hydrogen energy Vol. 47; no. 38; pp. 17022 - 17032
• Main Authors: Peng, Hui-Sheng, Zhong, Bei-Jing
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2022
• Subjects: Composition effect; Endothermic hydrocarbon fuel; Hydrogen effect; Laminar flame speed; Pyrolysis product; Pyrolysis product; Hydrogen effect; Composition effect; Endothermic hydrocarbon fuel; Laminar flame speed
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2022.03.166

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 C10–C12 cycloalkanes and alkanes account for the majority of the composition when the conversion rate is relatively low (≤0.072), while the C6–C8 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. •Rules of composition characteristics of complex pyrolysis products were obtained.•Analysis method of “carbon number + component type” was proposed.•Flame speeds of different pyrolysis products were systematically compared.•Relationships between composition distributions and flame speeds were revealed.