The combustion mechanism of aluminium in the steam/carbon dioxide mixed atmosphere

Abstract The ignition and combustion characteristics of aluminium (Al) in the steam/carbon dioxide (H 2 O/CO 2 ) mixed atmosphere were calculated by using a close homogeneous catch reactor and premixed laminar flame‐speed of CHEMKIN‐PRO. The effects of initial reaction temperature and H 2 O/CO 2 ratios on the system temperature, products, and ignition delay time were explored. The main reaction paths were analyzed by the temperature sensitivity. Al (l) entered the system with a pronounced phase transition and only one heating stage, but there are two heating stages in the Al (g) system. The reaction of Al in the H 2 O/CO 2 mixed atmosphere has a positive effect on the ignition delay time of the system. The high contents of CO 2 in the H 2 O/CO 2 mixed atmosphere can increase the maximum temperature of system and decrease the ignition delay time. Temperature sensitivity analysis shows that AlO, Al 2 O, and AlOH are important intermediate products, and Al 2 O 2 is the main substance that produces Al 2 O 3 . The dominant reaction path is Al → AlOH→AlO → Al 2 O → Al 2 O 2 → Al 2 O 3 . In addition, when the initial temperature was 2300 K, the laminar flame velocity was calculated to reach 35.6 m/s.