Plug-flow reactor and shock-tube study of the oxidation of very fuel-rich natural gas/DME/O2 mixtures

An Experimental and Modeling Study of Acetylene-Dimethyl Ether Mixtures Oxidation at High-Pressure

“…In the same line, Hashemi et al [12] detected, in a high-pressure flowreactor study, that the addition of DME to CH 4 (even small amounts as 530 ppm) causes an acceleration of its ignition, which is more noticeable for reducing conditions. This fact was also observed by Kaczmarek et al [13], who found that DME forms radicals that contribute to decrease, under fuel-rich conditions, the onset temperature for the conversion of natural gas by 200 K. Song et al [14], during ethane oxidation with the addition of DME, observed a decrease in aromatic species, key intermediates in soot formation, and the results obtained by Esarte et al [15] showed a diminution in the formation of soot when DME was added to acetylene at atmospheric pressure. Moreover, the addition of 20% of DME to n-butane in a rapid compression machine (16-30 bar), at an equivalence ratio of 0.5, results in an increase of free radicals, so the reactivity of the system is enhanced, and air-fuel mixtures can be ignited at lower temperatures [16].…”

Review of the Influence of Oxygenated Additives on the Combustion Chemistry of Hydrocarbons

“…JSR and flow reactor experiments, which mainly address the low-and intermediate-temperature chemistry, were performed for mixtures of methane/DME, 82 n-pentane/DME, 81 and very fuel-rich methane/ethane/propane/DME. 83 At high pressures (50 and 100 bar) and temperatures between 450 to 900 K, Hashemi et al 82 studied the effect of DME addition on the pyrolysis and oxidation of methane in a laminar flow reactor coupled with gas chromatography. The respective fuel profiles of mixtures with a DME to CH 4 ratio of 3.2% and 3.6%, respectively, showed a shift of the onset of methane consumption to lower temperatures, whereas DME consumption started at higher temperatures compared to the respective neat fuels.…”

“…Very recently, Kaczmarek et al 83 investigated the fuel conversion of very fuel-rich mixtures of methane/ethane/ propane/DME mixtures with TOF-MS in a laminar flow reactor to get deeper insights into fuel mixtures similar to natural gas. The species profiles revealed that DME initiates the conversion of the alkanes in the mixture at temperatures 200 K lower than for the neat alkane fuels under similar conditions, which was found to be due to radical production from DME.…”

“…In both ST and RCM experiments, the most widely used ether for IDT measurements of fuel blends containing an oxygenated component is dimethyl ether (DME). − Only recently, DME addition to hydrocarbons was investigated in JSR and flow reactor speciation experiments. − …”

“…Speciation experiments can give deeper chemical insights into the reaction chemistry in mixtures and the recorded species profiles can also serve as validation targets for detailed model development. JSR and flow reactor experiments, which mainly address the low- and intermediate-temperature chemistry, were performed for mixtures of methane/DME, n -pentane/DME, and very fuel-rich methane/ethane/propane/DME …”