An improved extended-corresponding-states theory for natural gas mixtures

1994 ◽  
Vol 15 (6) ◽  
pp. 1261-1269 ◽  
Author(s):  
M. Marrucho ◽  
A. M. F. Palavra ◽  
J. F. Ely
Keyword(s):  
Natural Gas ◽  
Gas Mixtures ◽  
Corresponding States ◽  
Extended Corresponding States

Application of Continuous Thermodynamics to Natural-Gas Mixtures

1990 ◽  
Vol 45 (5) ◽  
pp. 633-643 ◽  
Author(s):  
J. M. Prausnitz ◽  
R. L. Cotterman
Keyword(s):  
Natural Gas ◽  
Gas Mixtures

Composition of Mixtures of Natural Gas Components Determined by Raman Spectrometry

1980 ◽  
Vol 34 (4) ◽  
pp. 411-414 ◽  
Author(s):  
Dwain E. Diller ◽  
Ren Fang Chang
Keyword(s):  
Natural Gas ◽  
Mole Fraction ◽  
Gas Mixtures ◽  
Spectrometric Method ◽  
Gas Mixture ◽  
Raman Intensity ◽  
Raman Spectrometry ◽  
Intensity Measurements ◽  
Hydrocarbon Gas ◽  
Related Line

The feasibility of using Raman spectrometry for determining the composition of mixtures of natural gas components was examined. Raman intensity measurements were carried out on eight, gravimetrically prepared, binary gas mixtures containing methane, nitrogen, and isobutane at ambient temperature and at pressures to 0.8 MPa. The repeatability of the molar intensity ratio, ( I2/ y2)/( I1/ y1), where y1 is the concentration of component 1 in the mixture, and I1 is the intensity of the related line in the mixture spectrum, was examined. The compositions of two gravimetrically prepared methane-nitrogen-isobutane gas mixtures were determined spectrometrically with an estimated precision of about 0.001 in the mole fraction. Typical differences from the gravimetric concentrations were less than 0.002 in the mole fraction. The Raman spectrum of a gravimetrically prepared, eight component, hydrocarbon gas mixture was obtained to show that the Raman spectrometric method has potential for being applicable to natural gas type mixtures.

Capturing the Effects of NOX and SOX Impurities on Oxy-Combustion Under Supercritical CO2 Conditions for Coal-Derived Syngas and Natural Gas Mixtures

2021 ◽  
Author(s):  
Ramees K Rahman ◽  
K R v (Raghu) Manikantachari ◽  
Samuel Barak ◽  
Erik Ninnemann ◽  
Ashvin Hosangadi ◽  
...  
Keyword(s):  
Natural Gas ◽  
Supercritical Co2 ◽  
Gas Mixtures

Ignition Studies of C1-C7 Natural Gas Blends At Gas-Turbine Relevant Conditions

2021 ◽  
Author(s):  
Amrit Sahu ◽  
A.A.E.S Mohamed ◽  
Snehashish Panigrahy ◽  
Gilles Bourque ◽  
Henry Curran
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Gas Mixtures ◽  
Rapid Compression Machine ◽  
Temperature Range ◽  
Auto Ignition ◽  
Wide Range ◽  
Model Predictions ◽  
Detailed Kinetic Model ◽  
Sensitization Effect

Abstract New ignition delay time measurements (IDT) of natural gas mixtures enriched with small amounts of n-hexane and n-heptane were performed in a rapid compression machine to interpret the sensitization effect of heavier hydrocarbons on auto-ignition at gas-turbine relevant conditions. The experimental data of natural gas mixtures containing alkanes from methane to n-heptane were carried out over a wide range of temperatures (840-1050 K), pressures (20-30 bar), and equivalence ratios (f = 0.5 and 1.5). The experiments were complemented with numerical simulations using a detailed kinetic model developed to investigate the effect of n-hexane and n-heptane additions. Model predictions show that the addition of even small amounts (1-2%) of n-hexane and n-heptane can lead to an increase in reactivity by ~40-60 ms at a temperature of 700 K. The IDTs of these mixtures decrease rapidly with an increase in the concentration of up to 7.5% but becomes almost independent of the C6/C7 concentration >10%. This sensitization effect of C6 and C7 is also found to be more pronounced in the temperature range 700-900 K compared to that at higher temperatures (>900 K). The reason is attributed to the dependence of IDT primarily on H2O2(+M)??H+?H (+M) at higher temperatures while the fuel-dependent reactions such as H-atom abstraction, RO2 dissociation, or Q OOH+O2 reactions are less important compared to the temperature range 700-900 K, where they are very important.

Sign in / Sign up

Export Citation Format

Share Document