化工进展2023，Vol.42Issue(11)：5637-5647,11.DOI:10.16085/j.issn.1000-6613.2023-0016
燃气锅炉掺氢燃烧氮氧化物排放机理数值模拟
Numerical on emissions mechanism of nitrogen oxides in gas-fired boilers blended with hydrogen
摘要
Abstract
Combustion of adding hydrogen in industrial gas boilers can reduce the use of carbon-containing fuels,but it will cause an increase in NOx emission.Therefore,this paper conducted a detailed study on the hydrogen mixed combustion characteristics of an existing industrial gas-fired HL75-2.5/260-Q boiler.The formation law and reduction path of NO and N2O were explored to provide a fundamental guide for the subsequent development of low-nitrogen burners for hydrogen mixed combustion.Firstly,based on the detailed reaction mechanism of methane Gri-mesh 3.0,the combustion characteristics and pollutant formation characteristics of gas with a hydrogen content ratio of 0-90％ were simulated.Secondly,the chemical reactor network model inside the boiler was established by Chemkin,and the generation path,sensitivity,and production rate characteristics of NO and N2O under the optimal hydrogen mixing ratio were analyzed.The results showed that when the excess air coefficient was 1.2,the high-temperature area of the flame and the outlet temperature increased with the increase of the hydrogen doping ratio.The outlet NO concentration gradually increased from 85.59mg/m3 to 249.85mg/m3.The N2O emission first decreased and then increased,and the N2O emission was at least 0.16mg/m3 at the hydrogen mixed ratio of 0.2.NO mainly came from the elementary reactions R179(N + O2 ＝ NO + O)and R180(N + O2 ＝ NO + O)),and N2O mainly came from the elementary reaction R185[N2 + O(+M)＝ N2O(+M)].关键词
燃气锅炉/氢/氮氧化物/敏感性分析/生产速率分析/数值模拟Key words
gas-fired boiler/hydrogen/nitrogen oxide/sensitivity analysis/rate of production analysis/numerical study分类
能源与动力引用本文复制引用
赵巧男,刘雪敏,刘峰,徐洪涛,刘兆海,廖晓炜..燃气锅炉掺氢燃烧氮氧化物排放机理数值模拟[J].化工进展,2023,42(11):5637-5647,11.基金项目
国家重点研发计划(2021YFF0600605). （2021YFF0600605）
