通过数值模拟对某80 kW微型燃气轮机环形低氮燃烧室进行适当的改造并对其燃烧及NOx生成特性进行研究。研究结果表明：将烧天然气燃料的燃烧室改烧氨/氢混合燃料，在输出功率相同时燃料体积流量增大，通过增加燃料进气喷嘴的直径来降低燃料的进气速度；当掺氢比为0.3时，该结构的燃烧室燃烧不充分，燃烧效率达不到要求；当掺氢比在0.35~0.5、燃料华白数在19.9~21.7范围内变化时，该燃烧室可以实现高效稳定的燃烧，性能接近燃烧天然气燃料；氨/氢混合燃料中掺氢比增大，则NOx排放量也快速增大；由于燃料型NOx排放量占主导地位，该微型燃气轮机燃烧室不能实现低NOx燃烧，NOx排放远超国家标准，需要加装脱硝装置才能实际应用。

The annular lownitrogen combustion chamber of an 80 kW micro gas turbine was appropriately modified, and its combustion and NOx formation characteristics were studied by numerical simulation. The research results show that the combustion chamber based on natural gas fuel is changed to burn the ammonia/hydrogen mixed fuel, the fuel volume flow increases when the output power is the same, and the fuel intake speed is reduced by increasing the diameter of the fuel intake nozzle; when the hydrogen blending ratio is 0.3, the combustion chamber of the structure is not fully burned, and the combustion efficiency cannot meet the requirements; when the hydrogen blending ratio is 0.35 to 0.5 and the fuel white number changes between 19.9 and 21.7, the combustion chamber can achieve efficient and stable combustion, and the performance is close to that of burning natural gas fuel; as the hydrogen blending ratio in ammonia/hydrogen mixed fuel increases, NOx emissions also increase rapidly; due to the dominance of fuelbased NOx emissions, the combustion chamber of the micro combustion engine cannot achieve low NOx combustion, NOx emissions far exceed the national standard, and a denitrification device is required for practical application.

TK16

长沙理工大学研究生科研创新项目（CX2021SS61）；国家自然科学基金应急管理项目(51541601)