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富氢富氧调控的甲烷预混火焰结构和排放特性

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基于单头部钝体旋流模型燃烧器，以H2、O2和CO2为添加剂对甲烷空气预混火焰(CH4/air)进行调控，探究其对火焰结构、火焰稳定性和排放特性的影响规律。对各个掺混气进行变量控制和工况设计，利用数码相机和OH基平面激光诱导荧光技术测量火焰结构，利用Testo340烟气排放仪测量烟温及污染物CO和NOx排放量。研究结果表明:H2和O2掺混使火焰更加紧凑并增强燃烧强度，而CO2添加对此具有调节作用，它使火焰分布更宽，燃烧强度降低。O2掺混促成富氧燃烧之后，CO和NOx排放量均明显增加，不利于排放特性优化。相比之下，H2掺混在降低CO排放的同时能基本不影响NOx排放水平，同时以CO2替代N2虽然会提高CO排放，但可大幅降低NOx排放。H2和CO2掺混的影响具有较好的互补性，两者结合是实现甲烷稳定低排放燃烧调控的有效方法。
Structure and emission characteristics of premixed methane flame regulated by hydrogen and oxy-fuel enrichment
Based on a single-head bluff-body and swirl model combustor,the flame structure,flame stability,and emission characteristics of premixed methane flames(CH4/air)were studied,which were regulated by additives of H2,O2,and CO2.Fraction control of the additives was conducted and flame conditions were designed for various premixed mixtures.The flame structure was measured by using the digital camera and the technology of Planar Laser-Induced Fluorescence of OH radical.The flue gas temperature and emissions of pollutants CO and NOx were measured using the Testo340 gas analyzer.The results show that the addition of H2 and O2 leads to a more compact flame and enhances the combustion intensity,while the addition of CO2 is potential to mitigate such effects,causing a more distributed flame shape and a lower combustion intensity.When the oxygen-rich combustion occurs with O2 addition,both CO and NOx increase significantly,which is not favorable to reduce the emission.In contrast,the H2 addition can reduce the CO emission,while almost not affecting the NOx emission.Simultaneously,although replacing N2 with CO2 can increase the CO emission,it significantly reduces the NOx.The additives of H2 and CO2 exhibit complementary regulating effects,and their combination is an effective method to achieve stable and low emission combustion of methane.

combustion regulationhydrogen-enriched combustionoxy-fuel combustionCO emissionNOx emission

张玮杰、左睿烨、胡光亚、李德立、王金华、黄佐华

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西安交通大学动力工程多相流国家重点实验室,陕西西安,710049

燃烧调控 富氢燃烧 富氧燃烧 CO排放 NOx排放

国家自然科学基金资助项目国家重大科技专项National Natural Science Foundation of ChinaNational Science and Technology Major Program

52206169J2019-III-0014-0058

2024

10.11817/j.issn.1672-7207.2024.07.029

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(7)