Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (11): 5637-5647.DOI: 10.16085/j.issn.1000-6613.2023-0016

• Chemical processes and equipment • Previous Articles     Next Articles

Numerical on emissions mechanism of nitrogen oxides in gas-fired boilers blended with hydrogen

ZHAO Qiaonan1(), LIU Xuemin2, LIU Feng2, XU Hongtao1(), LIU Zhaohai3, LIAO Xiaowei2   

  1. 1.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.National Key Laboratory of Market Supervision (Safety and Energy Conservation of Special Equipment), China Special Equipment Inspection and Research Institute, Beijing 100029, China
    3.Tangshan Jidong Petroleum Machinery Co. , Ltd. , Tangshan 063200, Hebei, China
  • Received:2023-01-05 Revised:2023-04-18 Online:2023-12-15 Published:2023-11-20
  • Contact: XU Hongtao

燃气锅炉掺氢燃烧氮氧化物排放机理数值模拟

赵巧男1(), 刘雪敏2, 刘峰2, 徐洪涛1(), 刘兆海3, 廖晓炜2   

  1. 1.上海理工大学能源与动力工程学院,上海 200093
    2.中国特种设备检测研究院国家市场监管重点实验室(特种设备安全与节能),北京 100029
    3.唐山冀东石油机械责任有限公司,河北 唐山 063200
  • 通讯作者: 徐洪涛
  • 作者简介:赵巧男(1995—),女,博士研究生,研究方向为工业掺氢/氨燃烧特性及污染物控制。E-mail:zhao_qiaonan@163.com
  • 基金资助:
    国家重点研发计划(2021YFF0600605)

Abstract:

Combustion of adding hydrogen in industrial gas boilers can reduce the use of carbon-containing fuels, but it will cause an increase in NO x 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)].

Key words: gas-fired boiler, hydrogen, nitrogen oxide, sensitivity analysis, rate of production analysis, numerical study

摘要:

工业燃气锅炉掺氢燃烧可减少含碳燃料的使用,但会引起NO x 排放的增加。本文针对现有工业用HL75-2.5/260-Q型锅炉燃气掺氢燃烧特性展开详尽研究,探究NO和N2O的生成规律及减少路径,为后续掺氢燃烧低氮燃烧器开发提供依据。首先,基于甲烷详细反应机理Gri-mesh 3.0,对0~90%掺氢比的燃气燃烧特性及污染物生成特性进行模拟研究。其次,利用Chemkin建立该锅炉内部的化学反应器网络模型,研究了最佳掺氢比下的NO和N2O的生成路径、敏感性及生产速率特性。结果表明:在过量空气系数为1.2的情况下,随掺氢比增加炉膛内火焰高温区域增大,出口温度升高,出口NO由85.59mg/m3逐渐增多到249.85mg/m3;N2O呈现先减少后增加趋势,在掺氢比为0.2时N2O排放最少为0.16mg/m3;NO主要来源于基元反应R179 (N + O2 NO + O)和R180 (N+O2 NO + O),N2O主要来源于基元反应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

CLC Number: 

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