Effects of hydrogen concentration on the emission and heat transfer of a premixed LPG-hydrogen flame

A comparison of the emission and impingement heat transfer of LPG–H2 and CH4–H2 premixed flames

“…The details of the experimental setup and procedures used for the measurement of pollutant emission index and local impingement heat flux can be found in Zhen et al [20]. Only a brief description of the burner and control of the gas flows is given here.…”

“…This comparison between the two flames reveals that the CO reduction is more significant for lighter hydrocarbon flame for the following reasons. The effect of 'hydrogen dilution' on the decrease in EICO has been described in Zhen et al [20], who argued that for a hydrogenehydrocarbon fuel, the EICO would definitely decrease with the increase in hydrogen fraction even if the CO emission from the hydrocarbon component of the fuel is the same as the case of burning pure hydrocarbon. This reduction is related to the mass fraction of hydrocarbon in the hydrogenehydrocarbon mixture.…”

“…40% might be due to the more significant radiative heat loss for the LPG flames. It is known that soot, CO 2 and H 2 O are good radiation emitters in a hydrocarbon/air flame and the resultant radiative heat loss increases with increasing carbon input rate of the hydrocarbon fuel [20]. Because LPG is a heavier hydrocarbon, the radiation heat loss is thus more severe in the LPG flames, the consequence of which is a reduction in the temperature difference between the LPG and CH 4 flames.…”

Influence of the hydrogen-rich on the furnace thermal efficiency

“…Burning hydrogen gas leads to the emission of NO x , and does not cause the formation of CO 2, CO, SO x and incompletely burned hydrocarbons. For example, adding different ratios of hydrogen to hydrocarbon fuels (e.g., NG and C 3 H 8 ) can improve flame stability, increase combustion efficiency, increase the flame width and lower the flame length, and reduce radiation heat loss [8,18,19]. Hydrogen is thus regarded as the most promising source of clean energy [20].…”

The impact of hydrogen enrichment and bluff-body lip thickness on characteristics of blended propane/hydrogen bluff-body stabilized turbulent diffusion flames

“…Blended hydrocarbon/hydrogen fuels have been emerged as an attractive solution to decline emission levels while increasing performance efficiency of the combustors in regard to conventional hydrocarbon fuels [1,2]. These fuels accelerate the reaction rate of burning which achieves improved ignitability and flame holding.…”