The effect of burning velocity inhibitors on the ignition of hydrocarbon-oxygen-nitrogen mixtures

摘要: Abstract It has been proposed in the literature that mechanism of inhibition by halogens hydrocarbon flames involves an increase ignition temperature with a consequent prolongation preignition zone. An examination this hypothesis was undertaken systematic investigation effect number well-recognized burning velocity inhibitors on as mixtures hot wires 35-mm quartz tube. Data are reported for function additive concentration methane and/or propane oxygen and nitrogen at ambient pressure. Studies following 20 additives described: SnCl4, GeCl4, SiCl4, CCl4, SiCl3H, PCl3, AsCl3, TiCl4, CH2I, CH3Br, CH2Cl, CH3F, CH4Br1, CHBr2, Cl2, BBr3, CrO2Cl2, POCl2, Fe(CO)6. Although some experimental results quite disparate, several groups compounds do show similar behavior. The Group IVa chlorides trend somewhat to experiments. SnCl4 GeCl4 increased propane-air systems, whereas SiCl4 did not affect CCl4 lowered it. SiCl3H PCl3 decreased methane-air mixtures; AsCl3 it slightly. TiCl4 range studied. methyl halides order effectiveness: CH2I > CH3Br CH3Cl CH3F. A well-marked between system bromine atom found Br2, CH2Br2, CHBr3. However, while data latter could be correlated single curve, both BBr3 Br2 were more effective same concentration. In relatively large concentrations Cl2 (>4%), air decreased. behavior CrO2Cl2 completely unexpected. mixtures, temperatures linearly up maximum investigated. system. With enriched “air” (35%, O2), however, reduced increasing POCl3 slightly, Fe(CO)4 showed no systems Possible mechanistic explanations discussed.