The Impact Of Pressure On Methane Combustion With Co2 Dilution

Keywords

Chemistry; Kinetics; SCO2; Supercritical combustion

Abstract

In the current study the effect of CO2 dilution on reaction kinetics was studied numerically in a methane-oxygen reacting system as the operating pressure varied from subcritical to supercritical conditions. An inert CO2 molecule (ICO2) was introduced into the system, which had the same thermal properties and collision efficiencies as CO2, but did not directly participate in reactions as a reactant or product. Pressure and adiabatic flame temperature were held constant at 1500 K to compare the effect on combustion kinetics as the dilution levels varied. The results showed that CO and HCO were the two important species, and were influenced by the CO2 dilution and pressure. However, CO2 dilution and pressure had opposite influence on these two species. The CO2 dilution enhanced the production of these species, while increasing pressure slowed the process. The time history plots showed that the consumption of CH4 and O2 was delayed as the CO2 dilution increases. At 1 atm pressure, the results indicated that CO, HCO, O2, O, H2O2, HO2 and CH2O had the highest degree of chemical influence and were also the most affected by changes in the level of CO2 dilutions. At ninety percent CO2 dilutions, as the pressure increased from 1 atm to 300 atm, it was seen that O2, O, H2O2, H2O and HO2 were not influenced at high pressures (compared to near atmospheric conditions).

Publication Date

1-1-2017

Publication Title

10th U.S. National Combustion Meeting

Volume

2017-April

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

85049081706 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85049081706

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