管式加热炉甲烷掺氢比对燃烧及NO_(x)排放的影响  

EFFECTS OF HYDROGEN BLEND FRACTION IN METHANE ON COMBUSTION AND NO_(x) EMISSION IN TUBE FURNACE

作　　者：王文奇 高宇乐 郭晔媛 Wang Wenqi;Gao Yule;GuoYeyuan(Luoyang Ruichang Environmental Engineering Co.,Ltd.,Luoyang,Henan,471003)

机构地区：[1]洛阳瑞昌环境工程有限公司,河南洛阳471003

出　　处：《石油化工设备技术》2024年第3期60-66,I0004,共8页Petrochemical Equipment Technology

摘　　要：文章主要研究管式加热炉甲烷掺氢比对燃烧及NO_(x)排放的影响,为此基于管式加热炉,分别在1号炉测试圆形燃烧器,在3号炉测试附墙燃烧器。利用fluent中的FGM燃烧模型耦合GRI-Mech 3.0详细反应机理,结合热态实测烟气温度对其燃烧进行数值计算,研究分析管式加热炉甲烷掺氢比对燃烧及NO_(x)排放的影响。甲烷掺氢比控制在0%~60%(体积百分数)。研究结果显示:1)随着掺氢比的提升,1号炉NO_(x)排放量(标准状态,下同)由75 mg/m^(3)上升至100 mg/m^(3),3号炉NO_(x)排放量由63 mg/m^(3)下降至50 mg/m^(3);2)随着掺氢比的提升,温度高于1500℃时,1号炉热斑主要分布在燃烧器喷口之内且面积不断增大,3号炉热斑主要分布在燃烧器喷口之外且面积不断减小;3)在节能减排方面,相对于20%的掺氢比,掺氢比为60%时,1号炉换热效率提升了4.53%,3号炉换热效率提升了0.52%,烟气中二氧化碳减排26%;4)上述结果表明,掺氢提升NO_(x)排放,但炉内烟气内循环却减少NO_(x)排放,燃烧器最终的NO_(x)排放结果受到掺氢和烟气内循环综合效果的影响。This paper focuses on studying the effects of hydrogen blend fraction in methane on combustion and NO_(x) emission in tube furnace.Based on a tube furnace,circular burners were tested on furnace#1 and wall-mounted burners were tested on furnace#3.Using Fluent and coupling the FGM combustion model with the detailed reaction mechanism of GRI-Mech 3.0 and the measured temperature of flue gas in hot state,the effects of hydrogen blend fraction in methane on combustion and NO_(x) emission in the tube furnace were numerically calculated.The range of hydrogen blend fraction in methane was controlled between 0%and 60%(hydrogen by volume).The results showed that:1)as the hydrogen blend fraction increased,NO_(x) emissions increased from 75 mg/Nm^(3)to 100 mg/Nm^(3)for furnace#1 and decreased from 63 mg/Nm^(3)to 50 mg/Nm^(3)for furnace#3;2)as the hydrogen blend fraction increased,the hot spot above 1500℃mainly distributed inside the nozzle of the burner on furnace#1 and kept increasing in area,while it distributed outside the nozzle of the burner on furnace#3 and kept decreasing in area;3)in terms of energy saving and emission reduction,compared to the hydrogen blend fraction of 20%,the heat transfer efficiency of furnace#1 was improved by 4.53%and that of furnace#3 was improved by 0.52%with a hydrogen blend fraction of 60%,and the carbon dioxide emission reduction in flue gas was 26%;4)The above results show that hydrogen blend improves NO_(x) emission,but the internal circulation of flue gas in the furnace reduces NO_(x) emission.The final NO x emission result of the burner is affected by the comprehensive effect of hydrogen blend and internal circulation of flue gas.

关 键 词：管式加热炉 甲烷掺氢比 热斑 燃烧试验测量 试验验证 数值模拟 

分 类 号：TQ038[化学工程] X701[环境科学与工程—环境工程]