PAH formation characteristics in hydrogen-enriched non-premixed hydrocarbon flames

The utilisation of hydrogen with conventional hydrocarbons offers an excellent opportunity to decarbonise current energy systems without significant hardware upgrades. However, this presents fresh scientific challenges, one which is the difficulty in effective control pollutant soot emissions due complex reaction kinetics enriched flames. This paper focuses on polycyclic aromatic (PAHs), are building blocks and responsible for its carcinogenicity. Detailed understanding effect H2 underlying processes PAH formation growth important development strategies curtail hence, reduce from combustion systems. In study, experimental methodology was employed analyse characteristics laminar inverse diffusion flames various hydrocarbon fuels (alkanes alkenes) using simultaneous planar laser induced fluorescence (PLIF) imaging PAHs hydroxyl radicals (OH). OH PLIF used indicate peak temperature locations flame (flame front), while determine characteristics. Methane (CH4) also separately added same study effects carbon-bound addition, comparison addition. It observed that only addition CH4 showed variation magnitude reduction levels as length along front, Lf increased. results more reducing rate signal increase (indicative concentration growth) when compared both two distinct regions curve; a steep region followed by slower region. potentially indicative self-limiting nature growth. concluded lies within narrow band irrespective fuel bonding, molecular structure H:C ratio mixtures tested.