考虑化学反应模型的CH4非预混燃烧过程数值仿真  

Numerical Simulation of CH4 Non-Premixed Combustion Process Considering Chemical Reaction Model

作　　者：念腾飞 李竞高 李萍[1] 来平 李树旺 NIAN Tengfei;LI Jinggao;LI Ping;LAI Ping;LI Shuwang(School of Civil Engineering,Lanzhou University of Technology,Lanzhou Gansu 730050,China;China Railway 21st Bureau Group No.4 Engineering Co.,Ltd.,Xining Qinghai 811600,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]中铁二十一局集团第四工程有限公司,青海西宁811600

出　　处：《当代化工》2024年第9期2181-2189,共9页Contemporary Chemical Industry

基　　金：国家自然科学基金项目(项目编号:52368066);甘肃省自然科学基金项目(项目编号:23JRRA773);甘肃省高等学校创新基金项目(项目编号:2022A-026)。

摘　　要：为探究化学反应模型选取对甲烷(CH4)燃烧模拟的影响,同时促进天然气能源的高效利用,采用FLUENT软件对甲烷在燃烧器中的燃烧状况进行了数值模拟,分析了5种化学反应模型对甲烷燃烧效率、火焰形态、燃烧残余温度及NO排放等特性的影响。结果表明:组分PDF输运模型和涡耗散概念模型在甲烷的燃烧模拟中更有优势,甲烷的燃烧效率、燃烧残余温度均达到了较高的水平,其中组分PDF输运模型下组分间的反应更为充分,气体出口残余温度可达681.972 K;燃烧域内的火焰峰值温度与NO的排放呈现正相关的特点;涡耗散模型下燃烧反应的火焰峰值温度最高(2 280 K),但其生成的NO有害气体也最多,同时该反应下的燃烧残余温度较低;湍流动能与燃烧温度也呈现出正相关的特点,燃烧域内湍流动能大小在一定程度上影响甲烷的燃烧效果。In order to investigate the effect of the choice of chemical reaction model on the simulation of methane combustion,and to promote the efficient use of natural gas energy,FLUENT software was used to numerically simulate the combustion condition of methane in a burner.The effects of five chemical reaction models on the characteristics of methane combustion such as efficiency,flame profile,combustion residual temperature and NO emissions were analyzed.The results showed that the Composition PDF Transport model and the Eddy Dissipation Concept model were more advantageous than other chemical reaction models in methane combustion simulation.The combustion efficiency and residual combustion temperature of methane reached a high level,among which the inter-component reaction was more adequate in the Component PDF transport model,and the gas outlet residual temperature reached 681.972 K.The peak flame temperature in the combustion domain showed a positive correlation with NO emission.The peak flame temperature of the combustion reaction under the Eddy Dissipation model was the highest(2280 K),but it also produced the most harmful NO gas,while the combustion residual temperature under this reaction was lower.The turbulent kinetic energy also showed a positive correlation with the combustion temperature,and the magnitude of turbulent kinetic energy in the combustion domain affected the methane combustion effect to a certain extent.

关 键 词：甲烷 FLUENT燃烧仿真 化学反应模型 燃烧残余温度 NOX排放 

分 类 号：TQ038.4[化学工程]