Low-NOx NH₃-air combustion power generation technology was developed by using a 50-kWe class micro gas-turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan, for the first time. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and two-stage combustion with equivalence ratio control, we developed a low-NOx NH₃-air non-premixed combustor for the gas-turbine system. Considering a previously performed numerical analysis, which proved that the NO reduction level depends on the equivalence ratio of the primary combustion zone in a NH₃-air swirl burner, an experimental study using a combustor test rig was carried out. Results showed that eliminating air flow through primary dilution holes moves the point of the lowest NO emissions to the lesser fuel flow rate. Based on findings derived by using a test rig, a rich-lean low NOx combustor was newly manufactured for actual gas-turbine operations. As a result, the NH₃ single fueled low-NOx combustion gas-turbine power generation using the rich-lean combustion concept succeeded over a wide range of power and rotational speeds, i.e., below 10–40 kWe and 75,000–80,000 rpm, respectively. The NO emissions were reduced to 337 ppm (16% O₂), which was about one-third of that of the base system. Simultaneously, unburnt NH₃ was reduced significantly, especially at the low electrical power output, which was indicative of the wider operating range with high combustion efficiency. In addition, N₂O emissions, which have a large Global Warming Potential (GWP) of 298, were reduced significantly, thus demonstrating the potential of NH₃ gas-turbine power generation with low environmental impacts.

低NOx NH ₃空气燃烧发电技术是通过日本国立先进工业科学技术研究院（AIST）的50 kWe级微型燃气轮机系统首次开发的。基于全球对无碳发电的需求以及涉及燃气轮机技术的最新进展，例如热再生循环，使用强旋流的快速燃料混合以及采用当量比控制的两级燃烧，我们开发了一种用于燃气轮机系统的低NOx NH _3-空气非预混燃烧器。考虑到先前进行的数值分析，这证明了NO还原水平取决于NH _3中主燃烧区的当量比空气旋流燃烧器，使用燃烧器试验台进行了实验研究。结果表明，消除通过主要稀释孔的空气流会将最低NO排放点转移到较小的燃料流速上。根据使用试验台得出的发现，为实际的燃气轮机运行而新制造了一种贫油低NOx燃烧室。结果，使用稀燃燃烧概念的NH ₃单燃料低NOx燃烧燃气轮机发电在很宽的功率和转速范围内取得了成功，即分别低于10–40 kWe和75,000–80,000 rpm。 。NO排放降低到337 ppm（16％O ₂），约为基本系统的三分之一。同时，未燃烧的NH ₃尤其是在低电功率输出的情况下，功率的显着降低，这表明具有较高燃烧效率的较宽的工作范围。此外，全球变暖潜能值（GWP）为298的N ₂ O排放量也大大减少，从而证明了NH ₃燃气轮机发电的潜力对环境的影响很小。