Experimental investigation on combustion and emission characteristics of non-premixed ammonia/hydrogen flame
Experimental investigation on combustion and emission characteristics of non-premixed ammonia/hydrogen flame
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DOI：
10.1016/j.ijhydene.2024.02.281
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发表时间：
2024-04
影响因子：
7.2
通讯作者：
Fangyu Zhang;Gengxin Zhang;Zhongcheng Wang;Dawei Wu;Mehdi Jangi;Hongming Xu
中科院分区：
文献类型：
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作者：
Fangyu Zhang;Gengxin Zhang;Zhongcheng Wang;Dawei Wu;Mehdi Jangi;Hongming Xu
使用氨和氢作为燃料来实现重型运输行业的脱碳已经引起了全世界的关注。在这项工作中，旋流增强燃烧试验台已建成的非预混氨/氢火焰的燃烧和排放特性进行了研究。首先检查吹出极限，以确保可以实现稳定火焰的范围。在不同的当量比、掺氢比、进气温度、涡流数和燃烧室绝热条件下，测量了NO、NO2、NH3和H2的排放。利用OH * 化学发光光谱揭示了氨/氢非预混火焰的结构以及OH * 与NO发射的关系。当氢气掺混比大于20%时，可获得稳定的非预混氨/氢火焰。最佳的排放性能是在化学计量条件下实现的，由燃烧效率确定。燃烧室壁面的绝热条件对NO和NO2的排放起着关键作用，燃烧室壁面的绝热条件使NO和NO2的排放量显著增加，氨逃逸量减少，虽然较低的旋流数改善了火焰的稳定范围，但NO和NO2的排放量增加。
The use of ammonia and hydrogen as fuels to decarbonise the heavy transport industry has attracted worldwide attention. In this work, a swirl-enhanced combustion test rig has been built to investigate the combustion and emission characteristics of non-premixed ammonia/hydrogen flames. The blowoff limits were first examined to ensure that a range of stable flames could be achieved. Emissions containing nitric oxide (N O), nitrous oxide (N O 2), ammonia slip (N H 3) and unburnt hydrogen (H 2) were then measured with a variety of global equivalence ratios, hydrogen blending ratios, inlet gas temperature, swirl numbers and combustion chamber insulation conditions. The structure of non-premixed ammonia/hydrogen flames and the relationship between excited hydroxyl radicals (O H*) and N O emission were revealed using O H* chemiluminescence profiles. The stable non-premixed ammonia/hydrogen flames were achieved when the hydrogen blending ratio was greater than 20%. The optimal emission performance was achieved under stoichiometric conditions, as determined by combustion efficiency. The insulation conditions of the combustor wall played a key role in the emission results, as significant growth of N O and N O 2 as well as a reduction of ammonia slip were found. Although a lower swirl number improved the flame stability range, the increases in N O and N O 2 emissions were observed.