功率对空气分级NH3、NH3/CH4火焰排放的影响
The Effect of Power on the NOx Emission of Air Staged NH3,NH3/CH4 Flame
咸国礼 1孔雨晗 2姜磊 3胡宏斌 3张永生1
作者信息
- 1. 华北电力大学能源动力与机械工程学院,北京 102206
- 2. 中国科学院大学航空宇航学院,北京 100049
- 3. 中国科学院工程热物理研究所,北京 100190
- 折叠
摘要
NH3作为氢能载体,可实现氢能远距离输运.针对NH3燃烧的反应性低、稳定性差、高燃料型NOx排放问题,设计旋流燃烧器和空气分级燃烧室,实验研究功率为5～23 kW的NH3、NH3/CH4扩散火焰NOx排放特性.并采用化学反应器网络(CRN)进行化学动力学模拟,分析排放变化的原因.结果表明:5 kW、φpri=1.05的条件下,NH3火焰NOx测量排放最低为114.4×l0-6@15％O2;随着功率升高,NOx排放增加,且导致燃烧不充分、火焰延长,此时最佳φpri提前、燃烧范围减少、NOx进一步增加;本文的CRN更适合模拟预混燃烧的NOx排放,而不是扩散燃烧;功率升高不会改变反应路径,但生成NO的基元反应速率的升高幅度略大于消耗NO的基元反应速率,从而导致NO排放升高.
Abstract
NH3 has the potential to be used as a hydrogen carrier for long-distance hydrogen transportation.However,NH3 flame has low reactivity,poor stability,and high fuel NOx emission.To address these issues,a swirling burner and air staged liner were designed.The effect of power amplification on NOx emissions was experimentally studied,and chemical reactor network(CRN)was used for numerical analysis.The results showed that the NH3 flame NOx was the lowest at 114.4 xl0-6@15％O2 in the case of 5 kW and φpri=1.05.Amplifying power causes NOx increased and incomplete combustion which reduces the optimal φpri,the combustion range and further increases the NOx.Reducing volumetric heat intensity and increasing residence time decrease NOx.Moreover,CRN in this study is more suitable for premixed flame rather than non-premixed flame.Amplifying power does not change the reaction path but the increase in reaction rate for generating NO is faster than that for consuming NO,resulting in an increase in NO.
关键词
NH3、NH3/CH4火焰/NOx排放/旋流扩散燃烧/空气分级/CRN模拟Key words
NH3,NH3/CH4 flame/NOx emission/swirl non-premixed combustion/air staged com-bustion/CRN numerical simulation引用本文复制引用
基金项目
国家重点研发计划(2022YFB4003905)
出版年
2024
NETL
NSTL
万方数据