O_(2)/N_(2)和O_(2)/CO_(2)氛围下丙烷层流扩散火焰中碳烟生成数值模拟  

Numerical simulation of soot formation in propane laminar diffusion flame in O_(2)/N_(2)and O_(2)/CO_(2)atmosphere

作　　者：梁博文 王城景 张引弟[1,2] 龚焕文 辛玥 郭欣泽 蔺乔 LIANG Bowen;WANG Chengjing;ZHANG Yindi;GONG Huanwen;XIN Yue;GUO Xinze;LIN Qiao(College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan 430100,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]油气钻采工程湖北省重点实验室,湖北武汉430100

出　　处：《热力发电》2022年第8期164-173,共10页Thermal Power Generation

基　　金：国家自然科学基金项目(51974033);大学生创新创业计划项目(Yz2020272)。

摘　　要：富氧燃烧因其在强化燃烧和减少污染物排放方面的优势,被认为是一种极具潜力的清洁燃烧和碳捕集技术。基于有限速率化学反应模型,采用GRI-Mech3.0气相反应机理结合详细的热力学及输运数据,数值研究了2种富氧条件下丙烷同向流动扩散火焰中碳烟的生成,构建非反应性物质FCO_(2),探究了CO_(2)化学效应对丙烷火焰碳烟生成的影响。结果表明:随着氧体积分数的增加,火焰温度和碳烟体积分数显著增加,火焰高度显著降低,但与O_(2)/N_(2)相比,O_(2)/CO_(2)氛围下火焰温度和碳烟体积分数显著降低,火焰高度显著增加;O_(2)/CO_(2)氛围下通过CO_(2)热效应和化学效应影响火焰形态并降低关键组分H、OH自由基和C_(2)H_(2)的摩尔分数,CO_(2)主要通过降低H自由基摩尔分数从而影响碳烟质量成核率和表面生长速率,而不是通过促进碳烟氧化过程来抑制碳烟的生成。Oxygen-enriched combustion is considered as a potential clean combustion and carbon capture technology because of its advantages in strengthening combustion and reducing pollutant emissions.Based on the finite rate chemical reaction model,the soot formation in propane co-flow diffusion flame under two oxygen-enriched conditions was numerically studied by using GRI-Mech3.0 gas phase reaction mechanism combined with detailed thermodynamic and transport data,and the non-reactive substance FCO_(2)was constructed.The influence of CO_(2)chemical effect on propane flame soot formation was investigated.The results show that,with the increase of oxygen volumefraction,the flame temperature and soot volume fraction increases significantly,and the flame height decreases significantly,but compared with O_(2)/N_(2)atmosphere,the flame temperature and soot volume fraction decreases significantly and the flame height increases dramaticallyin O_(2)/CO_(2)atmosphere.In O_(2)/CO_(2)atmosphere,the CO_(2)thermal effect and chemical effect influencesthe flame morphology and reducesthe mole fraction of key components such as H,OH and C_(2)H_(2).The CO_(2)affects soot mass nucleation rate and surface growth rate mainly by reducing H mole fraction but not by promoting soot oxidation process.

关 键 词：丙烷火焰 富氧燃烧 碳烟生成 数值模拟 化学效应 

分 类 号：TK16[动力工程及工程热物理—热能工程]