摘要
为了探究某高温空气燃气炉燃烧及NO_(x)生成特性,本文采用工业实验和数值模拟相结合的方法进行探究。首先通过实验进行了燃气炉燃烧和NO_(x)生成特性研究,获取了燃气炉燃烧器区域温度分布和出口NO_(x)生成的相关实验数据。然后结合实验结果,提出了采用燃料侧引入再循环烟气从而降低NO_(x)生成的思路,并通过数值模拟的方式进行燃烧特性RANS计算,重点研究了燃料气和高温空气在烟气再循环燃烧中的掺混特性、燃烧特性和NO_(x)生成特性。结果表明:燃气炉系统在燃烧器区域温度分布不均匀,易产生局部高温区从而产生大量NO_(x);通过增加烟气再循环率,使得火焰长度不断缩短,主燃区的高温区面积不断减小,NO_(x)生成量不断降低。烟气再循环率从0提高至5%,燃气炉峰值温度降低较快,意味着NO_(x)生成量下降速率较快;烟气在循环率从5%提高至10%,峰值温度降低速率减慢。当烟气再循环率为8.75%时,温度分布均匀性较好,燃料炉峰值温度相对较低,局部高温区面积最小,NO_(x)生成速率最低,为燃气炉低氮改造提供了参考。
In order to investigate the combustion process and NO_(x) formations characteristics for a gas furnace within a high-temperature air,this paper adopts a combined method of industrial experiment and numerical simulation.Firstly,the combustion and NO_(x) generation characteristics were studied by experiments for the gas furnace,and its temperature distribution and NO_(x) generation data were measured.Then,the idea of introducing recirculating flue gas into the fuel side was proposed to reduce NO_(x) generations combined with the experimental results,and the combustion characteristics was carried out by the RANS method.The mixing,combustion and NO_(x) generations characteristics of fuel gas and high-temperature air were mainly studied in flue gas recirculation combustion.The results show that the temperature distribution of the gas furnace system is not uniform in the burner area,and the local high-temperature zone is beneficial to produce a large amount of NO_(x).By increasing the circulation rate of flue gas,the flame length is continuously shortened,the high-temperature area of the main combustion zone is continuously reduced,and the amount of NO_(x) generations are continuously reduced.The flue gas recirculation rate increased from 0 to 5%,and the peak temperature of the furnace decreased faster,meaning the NO_(x) generations decreased faster.The flue gas recirculation rate is increased from 5%to 10%,and the reduction rate of the peak furnace temperature is slowed down.When the flue gas recirculation rate is 8.75%,the furnace has a great temperature distribution uniformity,and its peak temperature is relatively low,the local high-temperature area is the smallest,and the NO_(x) formations rate is the lowest,which provides a reference for the low nitrogen transformation of gas furnace.
作者
陈浩
乔德康
孙艳萍
邱朋华
CHEN Hao;QIAO De-kang;SUN Yan-ping;QIU Peng-hua(CNOOC Energy Development Co.,Ltd.,Engineering Technology Branch,Tianjin 300452,China;CNOOC Key Laboratory of Offshore Heavy Oil Thermal Recovery,Tianjin 300452,China;CNOOC Energy Technology&Services Limited Key Laboratory for Enhanced Oil Recovery,Tianjin 300452,China;State Key Laboratory of Offshore Oil and Gas Exploition,Beijing 102209,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《节能技术》
2025年第6期530-534,575,共6页
Energy Conservation Technology
