大连海事大学学报 >
2019 , Vol. 45 >Issue 1: 117 - 128
DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2019.01.015
N2、CO2和H2O稀释对天然气层流燃烧速度的影响
收稿日期: 2018-07-02
修回日期: 2018-08-16
网络出版日期: 2018-08-16
基金资助
国家重点研发计划资助项目(2016YFC0205600); 国家自然科学基金资助项目(51509198;51479149);武汉理工大学研究生优秀学位论文培养项目资助(2018-YS-038).
Effects of N2, CO2 and H2O dilution on laminar burning velocity of natural gas
Received date: 2018-07-02
Revised date: 2018-08-16
Online published: 2018-08-16
利用CHEMKIN PRO软件分别探究了在标准大气压、393 K条件下, N2、CO2和H2O三种稀释成分对天然气层流燃烧速度的影响规律,并进行了化学动力学分析.结果表明,天然气的层流燃烧速度随稀释气掺混量的增大逐渐降低,其中CO2对层流燃烧速度的影响最为显著.自由基OH、H和O的浓度随稀释气掺混量的增大而逐渐减小,并且,天然气层流燃烧速度与OH和H的浓度之和密切相关.此外,通过设计几种虚拟成分分离了稀释气对天然气层流燃烧速度影响的物理效应(包括稀释效应与吸热效应)与化学效应,结果显示,稀释气体主要通过吸热效应对天然气的层流燃烧速度产生影响.在不考虑NOx生成情况下,N2影响天然气层流燃烧速度的主要方式是稀释与吸热;CO2的化学效应随着稀释比增大逐渐减小,稀释与吸热效应则有所增强;不同稀释比下,H2O的三种效应贡献率基本不变.
张尊华 , 曾璇 , 梁俊杰 , 王亮 , 李格升 . N2、CO2和H2O稀释对天然气层流燃烧速度的影响[J]. 大连海事大学学报, 2019 , 45(1) : 117 -128 . DOI: 10.16411/j.cnki.issn1006-7736.2019.01.015
Effects of three dilution gases including nitrogen, carbon dioxide and water vapor on the laminar burning velocity of natural gas under standard atmospheric pressure at 393 K were investigated by using CHEMKIN PRO software, and the chemical kinetic analysis was also carried out. Results show that the laminar burning velocity of natural gas decreases with the increasing dilution ratio, and among these three dilution gases, the effect of carbon dioxide dilution on the laminar burning velocity of natural gas is the most remarkable. The mole fractions of OH, H and O radicals decrease with the increasing dilution ratio, and the laminar burning velocity of natural gas strongly depends on the sum of mole fractions of OH and H. In addition, the physical (including dilution and thermal effects) and chemical effects of three dilution gases on the laminar burning velocity of natural gas were separated by designing several virtual species. The results show that thermal effects of dilution gases on the laminar burning velocities are the most obvious. Without considering the generation of NOx, nitrogen mainly has thermal and dilution effects on the laminar burning velocity of natural gas. The chemical effect of carbon dioxide gradually declines with the increase of dilution ratio, but its dilution and thermal effects rise with the increase of dilution ratio. Contributions of three effects of water vapor remain nearly constant when the dilution ratio varies.
Key words: natural gas; dilution gas; laminar burning velocity; chemical kinetics
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