两级浓淡燃烧室内氨-氢-空气预混旋流燃烧过程的NO_(x)排放特性  

NO_(x)Emission Characteristics of Ammonia-Hydrogen-Air Premixed Swirl Combustion in Two-Stage Rich-Lean Combustor

作　　者：屈海俊 苟小龙[1,2] Qu Haijun;Gou Xiaolong(School of Energy and Power Engineering,Chongqing University,Chongqing 400044,China;Key Laboratory of Low-Grade Energy Utilization Technologies&System,MOE,Chongqing 400044,China)

机构地区：[1]重庆大学能源与动力工程学院,重庆400044 [2]低品位能源利用技术及系统教育部重点实验室,重庆400044

出　　处：《燃烧科学与技术》2024年第1期32-42,共11页Journal of Combustion Science and Technology

基　　金：国家重点研发计划资助项目(2022YFE0125400).

摘　　要：为了掌握燃气轮机两级浓淡燃烧室内氨-氢-空气预混旋流火焰的NO_(x)排放特性和影响NO_(x)生成的动力学机制,对氨-氢-空气预混旋流燃烧过程进行了三维反应流数值模拟并开展了燃烧反应动力学特性研究.结果表明:在掺氢比为35%、压力为0.5 MPa且当量比为1.20的绝热燃烧工况下,NO_(x)排放可降至54×10^(-6)(15%O_(2)).H+O_(2)(+M)=HO_(2)(+M)是燃烧压力影响氨-氢燃料燃烧过程中NO_(x)排放的关键反应.燃烧压力的升高会促进NO与HO_(2)反应并转化为NO_(2).对于氨-氢混合燃料而言,过高的掺氢比(60%~80%)会导致NO_(x)排放显著升高,而根据壁面热损失程度的不同,适当的掺氢比(35%~55%)则有利于实现较低的NO_(x)排放(54×10^(-6)~86×10^(-6)(15%O_(2))).In order to understand the NO_(x)emission characteristics of the NH_(3)-H_(2)-air premixed swirl flame in the gas turbine two-stage rich-lean combustor and the kinetic mechanism affecting the NO_(x)formation,a threedimensional reacting flow numerical simulation of the NH_(3)-H_(2)-air premixed swirl combustion process was carried out and the kinetic characteristics of the combustion reaction were investigated.The results show that NO_(x)emission can be reduced to 54×10^(-6)(15%O_(2))under the adiabatic combustion condition with the hydrogen doping ratio of 35%,the pressure of 0.5MPa and the equivalence ratio of 1.20.H+O_(2)(+M)=HO_(2)(+M)is the key reaction in which pressure affects NO_(x)emission during NH_(3)-H_(2)fuel combustion.The increase of combustion pressure promotes the conversion of NO to NO_(2)by reacting with HO_(2).For NH_(3)-H_(2)blended fuel,excessively high hydrogen doping ratios(60%—80%)lead to a significant increase in NO_(x)emission,while appropriate hydrogen doping ratios(35%—55%)are favourable for achieving lower NO_(x)emission(54×10^(-6)—86×10^(-6)(15%O_(2)))depending on the degree of wall heat loss.

关 键 词：氨-氢燃料 两级浓淡燃烧 旋流火焰 化学动力学 NO_(x)排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]