Investigation of C2h6, C2h4, Co, H2 On the Explosion Pressure Behavior of Methane/Blended Fuels

The introduction of other combustible gases to methane could change accident consequences. This work aimed to experimentally compare the effects of blended fuels (C2H6, C2H4, CO, and H2 mix in different proportions) on the explosion pressure behavior of methane and blended fuels in air. The explosion pressure properties of the mixtures were tested. Principal component analysis was employed, and multiple regression models were developed to predict the influences of principal components on the maximum explosion pressure of CH4. In addition, the software was used to analyze and compare the sensitivity analysis. For the fuel-lean CH4-air mixture(φ = 0.72), the results demonstrated that the value of Pmax and (dP/dt)max of the mixed gases increased, as the volume fraction of the blended fuels increased. The effects of other gases followed the order C2H6>C2H4>H2>CO. For stoichiometric concentrations (φ = 1), the order of the influence degree was H2>CO > C2H6>C2H4, and the value of Pmax and (dP/dt)max of the mixed gases tended to decrease slightly. As the volume fraction of the blended fuels was increased to 2%, the Pmax and (dP/dt)max of CH4 showed a decreasing trend for the fuel-rich CH4-air mixture. The effects of blended fuels on the equivalence ratio of φ = 1.1 followed the order C2H4>H2>CO > C2H6. The sensitivity variation analysis and normalized sensitivity variation analysis indicated that the chain branching reaction 2CH3(+M)<=>C2H6(+M) was the most sensitive reaction under various conditions. However, it was not very susceptible to changes in the blended fuel ratio. Most reactions were susceptible to changes in the blended fuel ratio. The 10 most sensitive reactions were generally much more susceptible to changes in the blended fuel ratio in the 2% blended fuels than they were in the 0.4% blended fuels.