Synergistic effects of isobutene and carbon dioxide on suppressing hydrogen-air explosions

Abstract

The effects of isobutene (i-C4H8) and carbon dioxide (CO2) on hydrogen explosions have been explored in a 14 L spherical chamber at 100 kPa and 298 K. The results show that compared with CO2, the cooperation of i-C4H8 and CO2 can more effectively suppress the explosion pressure, pressure rise rate, and deflagration index. The minimum suppression concentration of CO2 with 1.5% i-C4H8 is much lower than that of CO2 alone. Numerical simulation reveals the mechanism of the suppression of i-C4H8 and CO2. I–C4H8 changes the reaction paths, and the addition of CO2 further lowers the adiabatic flame temperature and the active radical concentration. The excellent performance of the cooperation of i-C4H8 and CO2 in hydrogen explosions will provide a new idea for the prevention and control of hydrogen explosions.