摘要
与由CO和H2组成的常规合成气相比,生物质基合成气中CH4含量不可忽略,其燃烧反应机理与常规合成气存在显著区别。通过系统评估、简化与验证,发展一种新的21组分、17步反应简化机理,适用于典型生物质基合成气燃烧。首先,系统评估8种详细机理在大量实验中的预测性能,发现USC-Mech-Ⅱ机理具有最好的综合性能;然后依次采用基于误差传递的直接关系图法、基于误差传递直接关系图法的敏感性分析和奇异摄动法,在5种CO:H2比例下,对性能最好的详细机理进行系统简化,获得了典型生物质基合成气简化机理,并讨论了CO:H2比例对简化机理的影响;最后,系统验证了简化机理对着火、火焰传播、组分预测和熄火等典型燃烧特性与详细机理以及实验的预测误差,相对误差小于10%。
The combustion mechanisms of bio-syngas are significantly different from those of conventional syngas which consists of CO and H2, because the effect of CH4 cannot be neglected. This paper proposed a new 21-species, 17-step reduced mechanism for typical bio-syngas combustion by using comprehensive evaluation, reduction, and validation methods. First, through quantitative error evaluation against large amounts of experiments, the USC-Mech-Ⅱ mechanism obtains the best overall predictions among eight detailed mechanisms. Then, the mechanism with the best overall predictions was thoroughly simplified employing directed relation graph with error propagation(DRGEP), DRGEP-aided sensitivity analysis, and computational singular perturbation under five different ratios of CO to H2. The reduced mechanism was obtained and the effect of CO to H2 ratio on reduction was discussed. Finally, the reduced mechanism was systematically validated with the detailed mechanism as well as experiments in terms of typical combustion characteristics including ignition, flame propagation, concentration prediction, and extinction. The relative errors are less than 10%.
作者
李亮
李鹏飞
胡帆
郭腾
柳朝晖
LI Liang;LI Pengfei;HU Fan;GUO Teng;LIU Zhaohui(State Key Laboratory of Coal Combustion(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第14期4516-4525,共10页
Proceedings of the CSEE
基金
国家自然科学基金项目(91641122)
中国科协青年人才托举工程(2018QNRC001)。
关键词
合成气
生物质
机理评估
机理简化
机理验证
bio-syngas
biomass
mechanism evaluation
mechanism reduction
mechanism validation
