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Dynamic and Kinetic Studies on the Oxy-coal Combustion Using Multi-parameter High-speed Diagnostics by Wenkun Zhu; Xiaohui Li; Jiangbo Peng; Rui Sun; Zhuozhi Wang; Lei Zhang; Zhen Cao; Xin Yu is a Engineering article available to read on EtoBox.

What is Dynamic and Kinetic Studies on the Oxy-coal Combustion Using Multi-parameter High-speed Diagnostics about?

Non-intrusive measurement of dynamic and kinetic parameters during oxy-coal combustion has been carried out in an enclosed downward laminar flow reactor. High-speed OH-PLIF, CH\* chemiluminescence, and pyrometer were used to determine the luminescence species, particle velocity, and particle temperature. A two-step model was established to predict the release of coal combustible based on the Arrhenius expression. The experimental data from traditional coal char analysis methods verified the optical kinetic model. Experiments showed that homogeneous ignition first occurred and dominated the upstream volatile combustion. The heterogeneous reaction was activated upstream due to volatile oxidization and became dominant downstream. The coal combustion formed an overlapping region between volatile and char oxidations. This region played a critical role in enhancing flame stability. The duration of the overlapping region was smaller in oxy-fuel combustion than in airalike combustion due to the higher reaction rate and lower heat and mass diffusion. A temperature-dependent kinetic model was found to obey a two-step first-order Arrhenius expression with two pre-exponential factors (10 3.59±

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Author

Wenkun Zhu; Xiaohui Li; Jiangbo Peng; Rui Sun; Zhuozhi Wang; Lei Zhang; Zhen Cao; Xin Yu

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)