化工学报2026，Vol.77Issue(2)：1009-1020,12.DOI:10.11949/0438-1157.20250911
当量比与掺氢比对氨/氢/空气火焰及爆炸特性的影响
Influence of equivalence ratio and hydrogen ratio on flame and explosion characteristics of ammonia/hydrogen/air mixture
摘要
Abstract
In this paper,the effects of different equivalence ratios(Φ=0.8-1.4)and hydrogen fraction(XH2=20%—80%)on the explosion characteristics of ammonia-hydrogen-air mixtures were investigated through a combination of experimental and numerical simulation methods at 100 kPa and 293 K.The flame propagation,maximum explosion temperature(Tmax),maximum explosion overpressure(Pmax),maximum overpressure rise rate((d P/dt)max),flame thickness(δ),and laminar burning velocity(SL)were measured by constant-volume explosion experiments.Meanwhile,CHEMKIN software was employed to analyze the elementary reactions and combustion mechanisms under different conditions of Φ and XH2,as well as to calculate the adiabatic flame temperature(Tab).The results indicate that with the increase of XH2,both the flame propagation velocity and explosion intensity increase significantly,leading to greater flame instability and a transition in flame morphology from a smooth spherical shape to a cellular structure.The increase in Φ contributes to improved flame stability.Tab increases with the increase of XH2,while it first rises and then falls as Φ increases,and the maximum value appears at Φ=1.0.δ decreases with the increase of XH2,and the anti-disturbance ability of the flame surface decreases.Both the maximum explosion pressure(Pmax)and the maximum pressure rise rate(d P/dt)max increase with increasing XH2 concentration,with the explosion hazard significantly aggravated when XH2>60%.The experimentally calculated value of SL was validated through one-dimensional laminar flame simulations using CHEMKIN,revealing that SL increases nonlinearly with XH2,with a significantly accelerated growth rate when XH2 exceeds 50%.Sensitivity analysis shows that the elementary reaction H+O2⇌OH+O has the most significant promoting effect on SL,and the concentration changes of key free radicals H and OH are closely related to the combustion characteristics.The findings provide a theoretical basis for the safe utilization of ammonia-hydrogen blended fuels.关键词
氨气-氢气-空气/爆炸超压/火焰行为/绝热火焰温度/层流燃烧速度/数值模拟Key words
ammonia-hydrogen-air/explosion overpressure/flame behavior/adiabatic flame temperature/laminar combustion velocity/numerical simulation分类
能源科技引用本文复制引用
吴彬华,郭进,吴泽龙,章帆..当量比与掺氢比对氨/氢/空气火焰及爆炸特性的影响[J].化工学报,2026,77(2):1009-1020,12.基金项目
福建省"揭榜挂帅"引导性项目(2024H0041) （2024H0041）
