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The vapor-liquid water-hydrate (V-Lw-H) phase equilibria are essential for multiple processes involving methane substitution by carbon dioxide. This work developed a model to predict the multiphase equilibria of CH4CO2H2O systems using molecule-based statistical association fluid theory (SAFT2) equation of states for the vapor and liquid phases and the statistical model by van der Waals-Platteeuw...
Laminar burning velocities of hydrocarbon blends of relevance to natural gas combustion, with addition of 0, 10, 35 and 50% hydrogen, were measured using the heat flux method. Hydrocarbon blends were methane (80%)/ethane (20%), methane (80%)/propane (20%) and methane (80%)/ethane (10%)/propane (10%), and in addition experiments were performed using pure methane as a fuel. For the first time it was...
Moderate or Intense Low-oxygen Dilution (MILD) combustion which known as a combustion under highly preheated and diluted condition is a relatively new combustion regime including many differences in comparison with the traditional one. Among many distinguished disparities between combustion modeling of conventional and MILD ones, turbulent-chemistry interaction modeling is an open field of study....
Thermodynamic analyses of high pressure methane adsorption in shale are rarely reported because of the lack of a reliable approach for obtaining the true adsorption uptake from observed adsorption isotherms and the routinely used, oversimplified Clausius–Clapeyron (C-C) approximation. This work extends our previously proposed dual-site Langmuir adsorption model to calculate the isosteric heat of adsorption...
Hydraulic fracturing is an effective way of improving permeability of coal seams. Performance of the fracturing fluid is a key factor affecting the extent of improvement. Coal-seam permeability directly affects the difficulty of coal-bed methane extraction and is mainly related to the pore size. Comparison of the influence of water, which is widely used in underground fracturing, and viscoelastic...
Sodium dodecyl sulfate (SDS) has been widely shown to strongly promote the formation of methane hydrate. Here we show that SDS displays an extraordinary inhibition effect on methane hydrate formation when the surfactant is used in sub-millimolar concentration (around 0.3mM). We have also employed Sum Frequency Generation vibrational spectroscopy (SFG) and molecular dynamics simulation (MDS) to elucidate...
Pretreatment is very important for improvement of the biogas production from biomass in anaerobic digestion (AD) process, especially for lignocellulosic substrates. Hydrogen peroxide pretreatment (HPP) was used to enhance the AD of Miscanthus floridulus. Results showed that the maximum methane yield was produced at 0.8% H2O2 concentration at neutral pH, which was 278.7mL/g VS (volatile solid) and...
The synthesis, characterization, and performance of a new low pressure, monolithic, activated carbon adsorbent developed for methane storage is discussed and compared to other adsorbents. The effect of particle packing density on the storage capacity of tanks filled with commercially available and developmental adsorbents is quantified. 20kg of the developed monolithic material is tested using a custom...
In this article, the adsorption behaviors of methane on organic-rich shales were investigated through experimental and molecular simulation. The results showed that the methane adsorption capacity on kerogen is much greater than that of minerals and the methane adsorption capacity of clay minerals is greater than that on quartz. The isosteric heats of adsorption of methane decrease upon increasing...
Coal and gas outburst is a dynamic phenomenon with violent eruptions of coal and gas from the working coal seam, resulting in economic loss and casualties. It has been proved that rapid desorption within a short period is necessary for occurrence of an outburst. Due to limitation of the present test condition, gas desorption characterization for the first several seconds (0–10s) hasn’t been researched...
The oxidation of CH4 and CH4/C2H6 mixtures were studied at pressures relevant to knocking in large bore natural gas engines. The experiments were carried out in a rapid compression machine (RCM) at end of compression (EOC) temperatures ranging between 885 and 940K at compressed gas pressures of 105, 125, 150, and 160bar at varying equivalence ratios (0.417, 0.526, and 1.0) and dilution percentages...
First-principle calculations based on the density functional theory (DFT) were used to clarify the reaction mechanism of methane conversion over Ni-based oxygen carrier for chemical looping reforming. A systematic investigation about the methane sequential dehydrogenation process was firstly performed. Our calculation results showed that CH3→CH2+H is the rate-limiting step with the activation energy...
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