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过程工程学报 ›› 2021, Vol. 21 ›› Issue (2): 240-250.DOI: 10.12034/j.issn.1009-606X.220058

• 环境与能源 • 上一篇    

CH4掺混H2的燃烧数值模拟及掺混比合理性分析

王 珂1, 张引弟1,2*, 王城景1, 辛 玥1   

  1. 1. 长江大学石油工程学院,湖北 武汉 430100 2. 加拿大国家研究院测量科学与标准研究中心,加拿大 安大略 渥太华 K1AOR6
  • 收稿日期:2020-02-23 修回日期:2020-04-21 出版日期:2021-02-22 发布日期:2021-03-01
  • 通讯作者: 张引弟
  • 基金资助:
    国家自然科学基金;长江青年科技创新团队基金;国家留学基金;中国石油科技创新基金

Numerical simulation of combustion of CH4 mixed H2 and rationality analysis of premixed ratio

Ke WANG1, Yindi ZHANG1,2*, Chengjing WANG1, Yue XIN1   

  1. 1. College of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China 2. Measurement Science and Standards, National Research Council Canada, Ottawa, Ontario K1AOR6, Canada
  • Received:2020-02-23 Revised:2020-04-21 Online:2021-02-22 Published:2021-03-01

摘要: 本工作针对天然气掺氢燃烧技术在燃气锅炉的最佳掺混比开展数值模拟研究,以小火焰燃烧器为研究对象,计算了在空气氛围、恒定过氧系数、不同甲烷掺混氢气比条件下,掺氢比对燃料燃烧温度、燃烧速率、主要污染物排放浓度的影响。其中燃烧机理采用GRI-MECH 3.0简化机理,该反应包含24个基元反应,涉及17种组分。计算结果表明,随掺氢比增加,燃烧温度上升、燃烧反应速率加快,炭烟和CO的浓度与排放总量均降低,NOx的浓度上升但排放总量先减小后增大。结合我国城镇燃气的燃料互换性规范及工业污染物排放标准,得出最佳掺氢比为23%。

关键词: 掺氢燃烧技术, 掺氢比, 燃烧特性, 污染物生成, 燃气互换性, 数值模拟

Abstract: The hydrogen-blended combustion technology is a new technology that mixes a specific proportion of hydrogen, in the fuel, to improve combustion efficiency and reduce pollutant emissions. This technology is considered to be an effective method in improving the overall energy produced. The principle of “power to gas” technology is to take advantage of the intermittent nature of both wind-generated and solar energy, by using the surplus energy for the production of hydrogen by the electrolysis of water. The hydrogen can then be combined with carbon dioxide to produce methane, or by direct addition to natural gas in the pipeline network, thus enabling large-scale utilization of hydrogen energy. The rationality of the application of hydrogen-blended combustion technology in gas boilers is based on a simplified mechanism of GRI-MECH 3.0 of methane combustion. This reaction contains 24 elementary reactions involving 17 components. In this work, a numerical simulation experiment was designed, where atmospheric air was the oxidant, and the oxygen excess coefficient was maintained as a constant. A total of eleven groups of methane/hydrogen premixing ratios Rf (0~1) were considered and the effects of differing hydrogen blending ratios on fuel combustion temperature, combustion rate, and main pollutant emission concentrations were studied. The results showed that, by increasing the hydrogen blending ratio, both the combustion temperature and the reaction rate increased. Similarly, the concentration and the total emissions of soot and CO decreased, while the concentration of NOx increased, however, the total emissions decreased first then increased. The mechanisms relating to the effect of hydrogen mixing on the combustion process and the resultant pollutant formation were also analyzed, concerning China's urban fuel gas interchangeability regulations and industrial pollutant emission standards, the optimal hydrogen blending ratio was determined to be 23%.

Key words: Hydrogen-blended combustion technology, Hydrogen-blended ratio, Combustion characteristics, Pollutant generation, Gas interchangeability, Numerical Simulation