We study herein the effects of ozone (O3) addition on the ignition and explosion characteristics and the associated kinetic pathways of methane-oxygen (CH4-O2) mixtures. Results show that with ozone addition the ignition process changes from a single stage to two stages, that the first-stage ignition delay decreases and the system temperature increases with increasing addition, and that ozone addition mainly affects the first stage, with ozone decomposition being the key reaction in producing the free radical O. Ozone addition also affects the mixture's explosion limits in two aspects: (1) by reducing the critical temperature required for explosion under fixed pressure and (2) by inducing non-monotonicity into the otherwise monotonically varying pressure-temperature explosion boundary, by instituting a turning point that renders the response curve to be C-shaped.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology