Ignition delay time measurements behind reflected shock-waves for a representative coal-derived syngas with and without NH3 and H2S impurities

摘要: Abstract The composition of a representative coal-derived syngas was determined by averaging 40 practical coal compositions from the literature and corresponds to departure many recent studies which only focus on blends containing just CO H2. Ignition delay times have been measured behind reflected shock waves for this averaged mixture with an equivalence ratio 0.5 (0.4554% CO/0.3297% H2/0.1032% CO2/0.0172% CH4/0.2407% H2O/0.8538% O2 in 98% Ar (mol.%)) at around 1.7, 13, 32 atm. same also investigated impurities (200 ppm NH3 50 ppm H2S). Care taken when working H2O avoid errors shock-tube composition; direct measurement water vapor mole fractions were performed using tunable diode laser absorption diagnostic near 1.38 μm. effect various constituents ignition time comparing results baseline (H2/CO/O2/Ar) one other (i.e., CO2, CH4, Experimental data compared detailed kinetics mechanisms literature. Results showed that, under conditions study, extending include realistic concentrations species beyond H2 does not very large syngas. However, comparison derived biomass, tested earlier study authors, exhibited differences due larger CH4 concentration bio-derived Two chemical kinetic models found suitable reproduce these over most range mixtures, temperatures, pressures investigated, namely associated Galway Princeton.