Filtration combustion of methane, ethane, and propane mixtures with air

摘要

Filtration combustion waves of gaseous fuel/air mixtures freely propagating in inert porous media differ substantially from the homogeneous flames by combustion temperature, velocity, and flammability limits. In this work filtration combustion of methane, ethane, and propane mixtures with air is studied experimentally and numerically in a wide range of equivalence ratios (0.2 < φ < 0.5). This range extends from ultralean mixtures (φ) through the lean and rich region to the ultrarich mixtures (1.5 < φ < 2.5). Temperature velocities and chemical products of the combustion waves were recorded experimentally. Two-temperature numerical model based on comprehensive heat transfer and chemical mechanisms was developed and found to be in a good agreement with experimental data. It is observed that the products of methane, ethane and propane partial oxidation (H{sub}2, CO, and C2 hydrocarbons) are dominant for ultrarich superadiabatic combustion where up to 60%, 70%, 55% of fuel, respectively, is converted to CO and H{sub}2. Ethane conversion to hydrogen was significantly higher than for methane and propane.