NH_(3)/CH_(4)在MILD燃烧方式下的NO_(x)排放特性实验研究  

Experimental Study of NO_(x)Emission Characteristics in CH_(4)/NH_(3)MILD Combustion

作　　者：仝雨航 涂垚杰 刘豪[1] TONG Yuhang;TU Yaojie;LIU Hao(State Key Laboratory of Coal Combustion(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China)

机构地区：[1]煤燃烧与低碳利用全国重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》2025年第9期3563-3571,I0024,共10页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(52006077)。

摘　　要：氨燃料利用是能源低碳转型的重要手段,MILD(moderate&intense low oxygen dilution)燃烧技术可以有效提高氨燃料的燃烧效率并降低排放。基于自行搭建的20 kW燃烧炉开展NH_(3)/CH_(4)混合燃料在MILD燃烧方式下的NO_(x)排放特性实验研究,重点考察掺氨比、当量比以及炉膛内壁面温度对NO、NO_(2)及N_(2)O排放的影响规律,并与常规旋流燃烧方式进行系统对比。结果表明,相较于常规燃烧,MILD燃烧可有效降低氨燃料燃烧中NO和NO_(2)的排放,但存在N_(2)O排放问题。NO排放在35%~40%掺氨比和0.8当量比下达到峰值,并跟随壁温线性上升。随着掺氨比的提高和壁温的降低,N_(2)O排放逐步升高,在1000 K壁温、55%掺氨比条件下,N_(2)O排放高达40×10^(−6)。因此,在氨燃料MILD燃烧中,需协调N_(2)O排放与NO排放,尽可能降低NO_(x)排放。Ammonia fuel utilization is an important means of energy low-carbon transition,moderate&intense low oxygen dilution(MILD)combustion technology can effectively improve the combustion efficiency of ammonia fuel and reduce emissions.Based on a self-built 20kW combustion furnace,an experimental study is carried out on NO_(x)emission characteristics of NH_(3)/CH_(4)mixed fuel in MILD combustion mode,focusing on the influence of ammonia ratio,equivalent ratio and furnace inner wall temperature on NO,NO_(2)and N_(2)O emission,and systematic comparison is made with the traditional swirl combustion mode.Studies demonstrate that compared with traditional combustion,MILD combustion can effectively reduce the emission of NO and NO_(2)in ammonia fuel combustion,but N_(2)O emission occurs in MILD combustion.NO emissions peak at an ammonia ratio of 35%~40%and an equivalence ratio of 0.8,exhibiting a linear increase with wall temperature.With the increase of ammonia ratio and the decrease of wall temperature,the emission of N_(2)O gradually increases.At 1000K wall temperature and 55%ammonia ratio,the emission of N_(2)O reaches 40×10^(−6).In MILD combustion of ammonia fuel,coordinated control of N_(2)O and NO emissions is essential for effective NO_(x)reduction.

关 键 词：MILD燃烧 低氮燃烧技术 氨燃烧 NOX排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]