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过程工程学报 ›› 2019, Vol. 19 ›› Issue (5): 1047-1056.DOI: 10.12034/j.issn.1009-606X.219103

• 环境与能源 • 上一篇    

O2/CO2气氛中水蒸气预混CH4燃烧特性与烟气余热梯级利用方案

任 昕1, 张引弟1,2*, 刘 畅1, 王 珂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 渥太华
  • 收稿日期:2018-12-27 修回日期:2019-03-11 出版日期:2019-10-22 发布日期:2019-10-22
  • 通讯作者: 张引弟
  • 基金资助:
    国家留学基金资助项目;中国石油科技创新基金资助项目;国家自然科学基金资助项目 (U1302274);长江青年科技创新团队基金资助项目

Combustion characteristics of steam premixed CH4 in O2/CO2 atmosphere and cascade utilization process of flue gas waste heat

Xin REN1, Yindi ZHANG1,2*, Chang LIU1, Ke WANG1   

  1. 1. College of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China 2. Measurement Science and Standards, National Research Council Canada, Ottawa, Canada
  • Received:2018-12-27 Revised:2019-03-11 Online:2019-10-22 Published:2019-10-22
  • Supported by:
    ;Projects (U1302274) supported by the National Science Foundation of China

摘要: 对O2/CO2气氛中甲烷预混水蒸气燃烧特性及主要污染物生成进行了数值模拟研究,在加湿燃烧的基础上提出一种全新的清洁燃烧方式,即在保证甲烷流量一定时,通过改变入口处水蒸气的质量分数,研究水蒸气预混比Rf(0, 0.1, 0.2, 0.3, 0.4和0.5)对燃烧流场、燃烧组分和污染物浓度的影响。结果表明,随Rf增大,燃烧反应速率上升、燃烧效率提高且污染物排放量降低。模拟所得甲烷预混水蒸气的最优气氛为81%CH4/19%H2O,提出了一种高效节能的O2/CO2气氛下水蒸气预混CH4燃烧与烟气余热梯级利用方案。

关键词: 富氧燃烧技术, 注蒸气, 燃烧特性, 污染物生成, 烟气余热, 梯级利用

Abstract: Oxy-fuel combustion technology has become one of the most likely CCUS technologies to achieve large-scale commercial promotion and industrial application because of its remarkable energy-saving effect, low relative economic cost, easy industrialization and many other advantages. Different from traditional air combustion, oxy-fuel combustion technology uses pure oxygen and circulating flue gas as combustion-supporting medium to increase the volume concentration of CO2 in the exhaust gas to over 90%, which can be directly condensed and compressed to obtain liquid CO2, thus avoiding expensive separation process, so as to realize the permanent storage or resource utilization of CO2. In order to optimize the oxy-fuel combustion technology, a humidified oxygenated combustion technology combined with the oxy-steam combustion technology is proposed, which can significantly improve the combustion rate, combustion efficiency and the cycle thermal efficiency, promote the complete combustion reaction, and effectively reduce the emission level of pollutants (NOx and soot). In this work, the combustion characteristics and the generation of main pollutants of steam premixed CH4 in O2/CO2 atmosphere were analyzed by numerical simulation. A new clean combustion method was proposed to study the effects of single variable steam premixed ratio Rf (values 0, 0.1, 0.2, 0.3, 0.4 and 0.5) on the combustion flow field distribution, combustion components distribution and pollutant concentration distribution, by changing the mass fraction of water vapor at mass-flow-inlet while ensuring the methane mass flow rate was fixed. The results showed that with the increase of Rf, combustion reaction rate and combustion reaction efficiency increased and the pollutant emissions decreased, which fully reflected the superiority of steam injection combustion. Based on the simulation results, the optimum atmosphere of methane premixed water vapor was 81% CH4/19% H2O. Efficient and energy-saving steam premixed CH4 combustion in O2/CO2 atmosphere and flue gas waste heat deep cascade utilization process was proposed, which provided a new idea for the future development of combustion technology.

Key words: oxy-fuel combustion, steam injection, combustion characteristics, pollutant generation, flue gas waste heat, cascade utilization