VOCs丙烷掺混条件下射流扩散火焰稳定性和烟气排放特性研究  

Study on stability of jet diffusion flame and flue gas emission characteristics in propane VOCs mixing conditions

作　　者：段林林 刘岑凡 张一鸣 潘帅 张冲冲 赵飞 张永民 DUAN Linlin;LIU Cenfan;ZHANG Yiming;PAN Shuai;ZHANG Chongchong;ZHAO Fei;ZHANG Yongmin(College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing),102249 Beijing,China;Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation,China Special Equipment Inspection and Research Institute,100029 Beijing,China)

机构地区：[1]中国石油大学(北京)机械与储运工程学院,北京102249 [2]国家市场监管重点实验室(特种设备安全与节能),中国特种设备检测研究院,北京100029

出　　处：《煤炭转化》2025年第2期70-77,共8页Coal Conversion

基　　金：国家重点研发计划项目(2021YFF0600601).

摘　　要：工业挥发性有机物(volatile organic compounds,VOCs)废气处理是燃料清洁高效利用的重要研究方向之一。以丙烷作为VOCs代表,研究了空气伴流和空气侧掺混不同含量丙烷(体积分数分别为0.5%,1%,1.5%,2%)对火焰形态和稳定性的影响。结果表明:随着伴流速度增大,火焰提前发生推举和吹熄行为;随着空气侧掺混丙烷含量增加,火焰的初始推举速度和临界吹熄速度增大,火焰稳定性增强,推举火焰对应的雷诺数(Re)范围减小。根据预混理论分析了掺混丙烷后火焰稳定性提高的原因。固定伴流速度和射流速度条件下,掺混丙烷后导致湍流火焰传播速度增加,达到平衡对应的局部气速增大。分析空气伴流和空气侧掺混体积分数分别为1%和2%丙烷时烟气排放,发现相同射流Re下,随着丙烷掺混量增大,CO排放量增加,燃烧更不充分。丙烷掺混量高时,湍流阶段CO_(2)排放量稍降低。空气伴流下NO_(x)排放量高于掺混丙烷下NO_(x)排放量,主要原因是掺混丙烷后反应面的氮气量减少,NO_(x)相应减少。Industrial volatile organic compounds VOCs waste gas treatment isone of the important research directions for clean and efficient utilization of fuels.Taking propane as a representative VOCs,this study investigated the variations in flame morphology and stability characteristics under air co-flow and different amounts of propane blending(volume fractions:0.5%,1%,1.5%,2%)in the air stream.The results show that as the co-flow velocity increases,flame premature and blowout.Increasing propane blending in the air stream enhances the initial liftoff velocity,critical blowout velocityand flame stability while reducing the corresponding Reynolds number range for lifted flames.Premixed flame theory analysis reveals that propane blending increasesturbulent flame propagation velocity,requiring higher local gas velocity to reach equilibrium at fixed co-flow and jet velocity.Analyzed the flue gas emission with air co-flow and 1%(volume fraction,the same blow)and 2%propane blending in the air stream shows thatincreasing propane content leads to higher CO emissions and incomplete combustionat the same jet Reynolds number.When the propane content is high,the CO_(2) emissions decreases slightly during the turbulent phase.The NO_(x) emissions in the air co-flow is higher than that in the propane mixing,mainly due to reduced nitrogen content atthe reaction zoneafter propane addition.

关 键 词：射流扩散火焰 空气侧掺混 推举速度 吹熄速度 烟气排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]