氨气与甲烷混合气自燃过程的化学动力学研究

徐昊; 何志霞; 戴礼明; 王谦

doi:10.16236/j.cnki.nrjxb.202301001

氨气与甲烷混合气自燃过程的化学动力学研究

1. 江苏大学能源与动力工程学院;
2. 江苏大学能源研究院

基金项目:

国家自然科学基金资助项目(51876083)

详细信息

作者简介:
徐昊,硕士研究生,E-mail:582675893@qq.com

通讯作者:
王谦,博士,教授,E-mail:qwang@ujs.edu.cn

中图分类号: O643.21
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出版历程
- 收稿日期: 2021-11-21
- 刊出日期: 2023-01-24

Chemical Kinetics Study of the Autoignition of NH3/CH4 Mixtures

1. School of Energy and Power Engineering,Jiangsu University;
2. Institute for Energy Research,Jiangsu University

摘要

摘要: 在当量比φ=0.5、压力为2～7 MPa以及温度从930 K到1 140 K的条件下，用快速压缩机研究氨气（NH₃）和甲烷（CH₄）混合气的着火延迟时间，其中CH₄占总燃料的摩尔分数分别为0、5%、10%及50%．另外，在φ为1.0和2.0的条件下对掺入10%CH₄的混合气进行着火延迟时间测试．CH₄对NH₃的着火过程具有非常明显的促进作用，随着CH₄占总燃料的比例越来越高，混合气的着火延迟时间缩短，同时CH₄对着火的促进作用趋于平缓．含10%CH₄的NH₃的着火延迟时间在φ为0.5和1.0的条件下变化很小，而当φ=2.0时着火延迟时间增加约50%．利用试验数据对6种不同的NH₃氧化机理进行了验证，所开发的机理预测着火延迟时间最为准确，除了在最高温度，CH₄摩尔分数为50%时试验与计算差异达到了50%，其他所有条件下机理的预测结果与试验结果差距都小于30%．利用开发的机理进行敏感性分析，结果表明：当CH₄摩尔分数为5%和10%时，反应CH₄+NH₂=CH3+NH₃对稀薄燃烧条件下混合气的着火延迟时间有显著的促进作用；但当CH₄摩尔分数为50%时，该反应会表现出轻微的抑制作用．
- 氨气与甲烷混合气 /
- 化学动力学 /
- 着火延迟时间 /
- 快速压缩机
Abstract: Ignition delay times of NH₃/CH₄ mixtures with CH₄ mole fractions of 0,5%,10% and 50% were measured in a rapid compression machine at equivalence ratio of 0.5,pressures from 2—7 MPa and temperatures from 930 K to 1 140 K. In addition,measurements were performed for NH₃ mixtures with 10% CH₄ at φ=1.0 and 2.0.Methane shows a strong ignition-enhancing effect on NH₃,which levels off at higher CH₄ fractions,as the ignition delay time approaches that of pure methane. Autoignition delay times at 10% CH₄ at φ=0.5 and 1.0 are indistinguishable,while an increase of ignition delay times by factor of 1.5 was observed upon increasing φ to 2.0. The experimental data were used to evaluate six NH₃ oxidation mechanisms capable of simulating NH₃/CH₄ mixtures. The mechanism previously used shows the best performance:generally,it predicts the measured ignition delay times to better than 30% for all conditions,except for 50% CH₄ addition for which the differences increase up to 50% at the highest temperature. Sensitivity analysis based on the mechanism used indicates that under lean conditions the reaction CH₄+NH₂=CH₃+NH₃ significantly promotes ignition for CH₄ addition（5% and 10%）,but becomes modestly ignition-inhibiting at 50% CH₄.
- ammonia/methane mixtures /
- chemical kinetics /
- ignition delay time /
- rapid compression machine

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