为解决氨气燃烧污染物生成机理不清晰、燃烧室不同区域反应路径模糊等问题,同时实现低NO_x排放,本文以轴向分级燃烧室为研究对象,对氨气燃烧过程的NO生成路径进行总结分类,并探究主燃区当量比、停留时间、温度、压力等典型参数对NO生成特性的影响。结果表明：NO主要集中在主燃区经HNO路径生成,贫燃区NH_i路径对NO的还原起重要作用；控制主燃区在富燃条件下可以有效抑制NO生成,当量比最优取值为1.41；停留时间变化对NO排放影响不显著；O、H、OH、HNO等影响NO生成的主要自由基在低温、高压环境下会逐渐减少,进而控制NO形成。

In order to solve the problems such as unclear formation mechanism of pollutants in ammonia combustion, fuzzy reaction paths in different regions of the combustion chamber, etc., and achieve low NOx emission at the same time, this paper took the axial graded combustion chamber as the research object, summarized and classified the NO generation paths in the ammonia combustion process, and explored the influence of typical parameters such as equivalent ratio of the main combustion zone, residence time, temperature and pressure on the NO generation characteristics. The results showed that NO was mainly generated by HNO pathway in the main combustion zone, and NHi pathway played an important role in the reduction of NO in the poor combustion zone. NO generation can be effectively inhibited in the controlled main combustion zone under the condition of rich combustion, and the optimal equivalent ratio is 1.41. The change of residence time has NO significant effect on NO emission. The main free radicals, such as O, H, OH and HNO, which affect the formation of NO, will gradually decrease under low temperature and high pressure, thus controlling the formation of NO.

V231.2；TK16

国家科技重大专项(2017-III-0006-0031,Y2019-I-0022-0021)