Hydrogen/oxygen addition on premixed methane/air flames
Proceedings of the International Joint Power Generation Conference
The CHEMKIN kinetic simulation package is used to simulate the effects of the addition of small amounts of water electrolysis products on premixed, laminar, planar methane/air flames. A zero dimensional model along with detailed GRI methane kinetic mechanism are utilized to calculate the flame properties of various methane/hydrogen/oxygen/air mixtures. Pollutant concentrations, burning velocities, adiabatic flame temperatures and temperature profiles of these mixtures over a range of initial pressures (P 0 = 1, 3, 7 atm) and initial temperatures (T0 = 298 K and 600 K) are deduced for different addition percentages and different equivalence ratios. The hydrogen/oxygen additives are found to be effective on burning velocity enhancement, mostly by increasing the diffusion of active radicals such as OH and H. The addition of 10% pure hydrogen in the fuel is found to have a smaller effect in augmenting burning velocity, compared to adding the same amount of electrolysis product (hydrogen/oxygen in the same ratio as is found in water). While CO emissions are reduced when hydrogen is used to displace some of the carbon-containing fuels, the addition of oxygen increases the NOx concentrations somewhat.
Uykur, Cüneyt; Paun, Warren T.; and Ting, David S.K.. (2001). Hydrogen/oxygen addition on premixed methane/air flames. Proceedings of the International Joint Power Generation Conference, 1, 489-497.