Inhibition and enhancement of hydrogen explosion by perfluorohexanone

Abstract

To explore the inhibition and enhancement of hydrogen explosion by perfluorohexanone (CF3CF2COCF(CF3)2), the experiments are conducted by changing the equivalence ratio, inhibitor content, initial pressure and initial temperature, and the maximum explosion overpressure (MEO), maximum rate of pressure rise (MRPR) and critical content of explosion inhibition are obtained. The adiabatic flame temperature, sensitivity coefficient and mole fraction of active radicals are calculated using CHEMKIN. The results show that on the lean side, the sub-inhibitory perfluorohexanone generates CO to be involved in the combustion, and the formation of HF releases lots of heat, which causes the combustion enhancement. On the stoichiometric and rich sides, H is captured by other fluorides, exhibiting the inhibitory effect. Increasing the initial pressure (initial temperature) causes an increase (decrease) in the MEO and the MRPR. As the equivalence ratio increases, initial pressure reduces and initial temperature increases, the critical content of explosion inhibition is effectively reduced.