非预掺混氢/天然气烟气内循环燃烧特性研究  

Combustion Characteristics of Non-Premixed Hydrogen/Natural Gas Flue Gas Based on Flue Gas Internal Recirculation

作　　者：颜衎梯 王勇 刘芃芃 赵硕 韦耿 卓建坤[3] 姚强 李水清[3] Yan Kanti;Wang Yong;Liu Pengpeng;Zhao Shuo;Wei GengZhuo Jiankun;Yao Qiang;Li Shuiqing(School of Electrical Engineering,Xinjiang University,Urumqi 830046,China;Key Laboratory of Clean Combustion and Flue Gas Purification in Sichuan Province,Dongfang Electric Group Dongfang Boiler Co.,LTD.,Chengdu 611731,China;Key Laboratory of Thermal Science and Power Engineering,Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]新疆大学电气工程学院,乌鲁木齐830046 [2]东方电气集团东方锅炉股份有限公司清洁燃烧与烟气净化四川省重点试验室,成都611731 [3]清华大学热科学与动力工程教育部重点实验室,北京100084

出　　处：《燃烧科学与技术》2025年第2期212-220,共9页Journal of Combustion Science and Technology

基　　金：国家重点研发计划资助项目(2022YFB4003900).

摘　　要：本文设计并实验研究了一种非预掺混氢/天然气烟气内循环低氮燃烧器,以实现高比例氢气的灵活掺混、低NO_(x)排放和燃烧稳定性.通过改变掺氢比例,研究发现NO_(x)排放量在50%掺氢时热值比达到最低值71.3 mg/m^(3)(@3.5%O_(2)),与未加入烟气内循环的参考燃烧器相比,显著降低了NO_(x)排放水平.数值模拟分析揭示了燃烧器出口附近存在着内外两个回流区,即以钝体为中心的内回流区,以及炉膛外壁面作用下形成的外回流区,这两个区域为燃烧器提供稳定的火焰锚定点,确保了在0至100%掺氢比范围的稳定燃烧.掺氢比不会影响内、外回流区位置和大小,只会影响回流气体速度大小.NO_(x)排放在50%掺氢比时最低的关键是火焰结构发生了转变,使高浓度OH、O活性自由基大幅减少,进而降低了热力型NO_(x)排放.In this paper,a non-premixed hydrogen/natural gas flue-gas internal recirculation(FIR)low-nitrogen burner is designed and experimentally studied to achieve flexible blending with a high proportion of hydrogen,low NO_(x) emission,and combustion stability.By changing the hydrogen blending ratio,it was found that the NO_(x) emission reached the lowest value of 71.3 mg/Nm^(3)(@3.5%O_(2))at 50%hydrogen blending,which significantly reduced the NO_(x) emission level compared with the reference burner without the addition of FIR.The numerical simulation analysis reveals that there exist two reflux zones near the burner outlet,namely the internal reflux zone centered on the bluff body and the external reflux zone formed under the action of the outer wall of the furnace.These two zones provide a stable flame anchor point for the burner and ensure stable combustion within the range of 0%to 100%hydrogen mixing ratio.The hydrogen blending ratio does not affect the position and size of the internal and external reflux zones;instead,it only affects the velocity of the reflux gas.The key to the lowest NO_(x) emission at 50%hydrogen blending ratio is the change in flame structure,which greatly reduces the high concen-tration of active OH and O free radicals,and thus reduces the thermal NO_(x) emission.

关 键 词：富氢燃气 烟气内循环 钝体燃烧 

分 类 号：TK11[动力工程及工程热物理—热能工程]