摘要
富氧燃烧是未来实现氨燃料零碳高效发电的重要技术,其发展受火焰温度和氮氧化物排放高的限制。稀释剂技术是抑制火焰温度和氮氧化物排放的有效策略,包括氮气和蒸汽稀释策略。本文基于数值模拟对比研究了蒸汽和氮气稀释对氨富氧燃烧火焰速度、NO排放、温度和熄灭拉伸率的影响规律和作用机理。结果表明蒸汽稀释对火焰速度的抑制效率为氮气稀释的1.22~1.38倍,且其抑制火焰温度和NO_(x)排放的效果更为显著。在富燃条件下,蒸汽对火焰温度和NO排放的抑制作用进一步加强,但贫燃条件下蒸汽稀释会加剧NO排放。蒸汽稀释下的氨富燃火焰相较于氮气稀释更容易发生熄灭,且富燃条件下的熄灭拉伸极限显著变窄。
Oxy-fuel combustion is the crucial technology for achieving future zero-carbon,highefficiency ammonia power generation.Its development is limited by high flame temperature and nitrogen oxide emissions.Diluent technology,which includes nitrogen and steam dilution strategies,is essential for controlling flame temperature and NO_(x)emissions.This study numerically investigates the effects and mechanisms of steam and nitrogen dilution on flame speed,NO emissions,temperature,and extinction stretch rate in oxy-ammonia combustion.The results indicate that steam dilution’s inhibition efficiency of flame speed exhibits 1.22∼1.38 times compared to nitrogen dilution,and steam dilution reduces flame temperature and NO emissions more significantly.Under fuel-rich conditions,the inhibition of steam on flame temperature and NO emissions are further enhanced,while steam dilution increases NO emissions under fuel-lean conditions.Ammonia-rich flames with steam dilution are more prone to extinction than those with nitrogen dilution,and the extinction stretch limit narrows significantly under fuel-rich conditions.
作者
高继录
张屿
赵义军
曾光
孙绍增
GAO Jilu;ZHANG Yu;ZHAO Yijun;ZENG Guang;SUN Shaozeng(CPI Northeast Energy Technology Co.,Ltd.,Shenyang 110179,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《工程热物理学报》
北大核心
2025年第9期3119-3133,共15页
Journal of Engineering Thermophysics
基金
中央高校基本科研业务费专项资金资助(No.HIT.OCEF.2022027)。
