氨气/甲烷旋流火焰结构及NO_(x)排放规律研究  

Investigation on Flame Structure and NO_(x) Emissions of Ammonia/methane/air Swirl Stabilized Flames

作　　者：卫旭涛 王金华[1] 张猛[1] 苏利天 安振华 黄佐华[1] 谭厚章[2] WEI Xu-Tao;WANG Jin-Hua;ZHANG Meng;SU Li-Tian;AN Zhen-Hua;HUANG Zuo-Hua;TAN Hou-Zhang(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;MOE Key Laboratory of Thermo-Fluid Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]西安交通大学热流科学与工程教育部重点实验室,西安710049

出　　处：《工程热物理学报》2022年第4期1108-1115,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51706172)。

摘　　要：氨气是一种十分具有前景的燃料,其优势在于完全的去碳化以及成熟的制取储藏运输工艺,其面临的主要问题是燃烧稳定性差以及NO_(x)排放比较高。本研究基于半封闭空间旋流燃烧器,对氨气火焰和低甲烷掺混比氨气/甲烷火焰的流场和火焰结构进行测量。流场的主要区别是两工况火焰位置处的湍流强度的差别,90%NH_(4)火焰的湍流强度明显大于NH_(4)火焰。在相同流速下,当量比对氨气火焰结构的影响,主要集中于对火焰高度的改变。采用气体分析仪对火焰主要燃烧产物的排放特性进行测量,CH_(4)掺混使浓燃时未燃NH_(4)排放增加,同时有较大的CO及CO_(x)排放;稀燃时90%NH_(4)火焰的NO_(x)排放高于NH_(4)火焰。在当量比1.1附近存在一个各项排放均比较低的位置,低的掺甲烷比并不会明显对该位置有所影响。Ammonia is identified as a promising fuel, because of the advantages of its carbon-free nature and well-established carriage and storage technique. However, NH_(4) fuel is still facing several challenges which mainly include the difficulties to stabilize flames and the unacceptable huge NO_(x) emissions. In this study, the reacting flow fields and the flame structures of NH_(4)/air flames as well as NH_(4)/CH_(4)/air flames on low CH_(4) blending ratio were measured. The turbulence intensity of two kinds of flames shows difference at the flame positions. The turbulence intensity of 90% NH_(4) flame is higher than that of NH_(4) flame. At the same bulk velocity, the effect of equivalence ratio on the NH_(4) flame structure is mainly concentrated on the change of the flame height. A gas analyzer was used to measure the emissions. The addition of CH4increases the unburned NH_(4) emission during equivalent ratio over 1.0, and also causes large CO and CO_(x) emissions. The NO_(x) emissions of 90%NH_(4) flame is higher than that of NH_(4) flame. At the condition near equivalent ratio of 1.1, all emissions are relatively low, and the low methane blending ratio does not have a significant impact on this low emission position.

关 键 词：氨气甲烷掺混 旋流 PIV OH-PLIF NO_(x)排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]