Ultrarich Filtration Combustion of Ethane

Abstract

Ultrarich filtration combustion of ethane is studied in a porous medium composed of alumina spheres with the aim to achieve optimized conversion to hydrogen and syngas. Temperature, velocities, and chemical products of the combustion waves are recorded experimentally in a range of equivalence ratios ϕ from stoichiometry (ϕ = 1) to ϕ = 2.5. Experimental and numerical results are reported for 3.5 mm diameter alumina spheres; an oxygen content of the oxidizer is varied from 21 to 30%. Two temperature models based on GRI-MECH 3.0 and San Diego-MECH demonstrated good agreement with the experimental results. The maximum hydrogen concentration of 19.3% was recorded at ϕ = 2.5 and a 30% oxygen content in the oxidizer.

Hydrogen Production from Methanol and Ethanol Partial Oxidation

“…All propagation speeds are less than ∼0.0025 cm/s. In summary, for two fuel–air mixtures, the regimes of sub- and superadiabatic combustion also manifest themselves in the directions of the wave propagation …”

“…In summary, for two fuel−air mixtures, the regimes of sub-and superadiabatic combustion also manifest themselves in the directions of the wave propagation. 21 Figures 3 and 4 show combustion temperature and wave velocity for different oxygen contents in the air for the cases above with equivalence ratios of 4.0 and 5.0 for the two fuels. For methanol (Figure 3), the decrease in the temperature with an increasing percentage of oxygen is within experimental uncertainty.…”

“…At equivalence ratios above 1.0, complete combustion cannot be achieved because of the insufficient oxygen content of the mixture. 21 The experimental results for concentrations of major combustion products are presented in Figure 5 over a wide range of equivalence ratios for both methanol and ethanol. Hydrogen generation for both fuels increases with the equivalence ratio up until ∼ϕ = 6.…”

Effect of Dimethyl Ether as an Additive to Liquefied Petroleum Gas Flame in SiC–Al2O3-Based Porous Inert Burner

“…The PIB is also regarded as the most promising technology for producing H 2 and syngas (H 2 + CO) from the fuel-rich combustion of gaseous and liquid hydrocarbons. − ,− In order to demonstrate the influence of DME addition on the H 2 /syngas generation capability of LPG–air combustion under fuel-rich conditions, Figure reports the concentrations of H 2 , CO, and CO 2 at the PIB exit as a function of α, for the same input condition of φ = 1.3 and m = 1.5 kg/m 2 s. It is found that conversion of initial reactant to H 2 increases mildly with the addition of DME to the LPG–air mixture. However, a substantial decrease in CO mole fraction is observed with the increase of DME content in the LPG–DME mixture, causing a decline in syngas yield.…”

“…Porous media combustion is one such technology in which the fuel–air mixture is allowed to combust in a conducting and radiating porous medium. Because of improved heat transfer within the porous medium, not only can low heating value fuels be easily combusted but also a substantial improvement in combustion efficiency and better emission characteristics can be attained. − Because of these unique features, porous media combustion has potential applications in internal combustion engines, , heat exchangers, radiant burners, − micro burners, gas turbines and propulsion, syngas and hydrogen production, − and cooking stoves. − …”