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The Chinese Journal of Process Engineering ›› 2022, Vol. 22 ›› Issue (7): 873-881.DOI: 10.12034/j.issn.1009-606X.221284

• Research Paper • Previous Articles     Next Articles

Combustion characteristics of natural gas mixed with hydrogen in domestic burners

Shuaiming FENG1,  Wei DU1,  Qi XIA1,  Chen CHEN1,2,3*,  Zengliang GAO1   

  1. 1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310021, China 2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China 3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-08-31 Revised:2021-10-09 Online:2022-07-28 Published:2022-08-02

掺氢天然气在家用燃烧器中的燃烧特性

冯帅明1, 杜伟1, 夏起1, 陈晨1,2,3*, 高增梁1   

  1. 1. 浙江工业大学机械工程学院,浙江 杭州 310021 2. 中国科学院工程热物理研究所,北京 100190 3. 中国科学院大学,北京 100049
  • 通讯作者: 陈晨 chen89@zjut.edu.cn
  • 基金资助:
    中国自然科学基金;浙江省自然科学基金

Abstract: In order to decrease CO2 emission, relieve the pressure of natural gas supply and promote the scale consumption of hydrogen energy, using natural gas mixed with hydrogen for combustion is considered to be one of the most promising ways. At present, the research on natural gas mixed with hydrogen is mainly focused on industry. In this work, the combustion characteristics of a burner for domestic use with natural gas mixed with hydrogen were studied. A two-dimensional axisymmetric model of the burner was developed with Fluent software coupled with GRI 2.11 chemical reaction mechanism file. The numerical model was verified by comparing the numerical simulation results with the reference experimental results. Furthermore, the effects of different amount of premix of fuel and air, and secondary air flow velocity on combustion temperature, main free radical content and combustion pollutants were analyzed. The results showed that with the amount of premix (primary air coefficient) increasing, the peak temperature increased greatly, NO peak mass fraction increased firstly and decreased, CO peak mass fraction increased gradually. As the secondary air velocity (excess air coefficient) increased, the temperature and pollutant content changed little. Compared with the effect of amount of premix, the effect of air velocity was almost negligible.

Key words: atmospheric burner, natural gas mixed with hydrogen, secondary air velocity, amount of premix, combustion characteristic

摘要: 为了降低CO2排放,缓解天然气供应压力,促进氢能规模消纳,掺氢天然气被认为是最有前途的途径之一。目前,掺氢天然气的研究主要集中在工业上,本工作基于以掺氢天然气为燃料的家用大气式燃烧器的燃烧特性,利用Fluent软件结合GRI 2.11化学反应机理文件,建立燃烧器二维轴对称模型,对比数值模拟结果与实验结果,验证了数值模型的合理性;分析了燃料与空气不同预混量以及二次风流速对燃烧器的燃烧温度、主要自由基含量、燃烧污染物等的影响规律。结果表明,随着预混量(一次空气系数)增大,峰值温度大幅度升高,NO峰值质量分数先增大后降低,CO峰值质量分数逐渐增大;随着二次风流速(过量空气系数)增大,温度与污染物含量变化很小,与预混量的影响相比,二次风流速的影响几乎可以忽略不计。

关键词: 大气式燃烧器, 掺氢天然气, 二次风流速, 混合量, 燃烧特性