【摘要】 以采用当量比燃烧+EGR+铂/铑/钯基TWC技术路线、且满足国六排放标准的重型燃气机为研究对象，基于全球统一瞬态实验循环（WHTC）工况对燃气机瞬态条件下不同燃气组分、排气温度、尾气组分的N₂O排放特性进行定量研究。结果表明：N₂O排放主要集中在冷态WHTC城市工况前140 s，热态WHTC总排放量约是冷态的1%；燃料组分对N₂O生成有一定影响，含N₂高的低热值G25燃气冷、热态N₂O排放浓度均高于LNG、CNG，加权比排放量分别为15.3 mg·kWh^-1、9.6 mg·kWh^-1、7.5 mg·kWh^-1;N₂O生成与温度密切相关，主要生成区间为160～350℃，高温会抑制N₂O生成；N₂O与NH₃的生成存在竞争关系，高于400℃时NH₃生成量增加。本研究可为重型燃气机污染物N2O的源头控制提供参考。更多还原

【Abstract】 Taking a heavy-duty gas engine using equivalent ratio combustion EGR Pt/Rh/Pd three-way Catalys and meeting the National Ⅵ emission standards as the research object,this study quantitatively investigated the N₂O emission characteristics of the gas engine under transient conditions with different gas compositions exhaust temperatures,and tail gas compositions based on the global transient cycle WHTC.The results showed that N₂O emissions were mainly concentrated in the first 140 seconds of the cold WHTC urban cycle,and the total N₂O emissions of the hot WHTC are about 1%of the cold cycle.The fuel composition had a certain influence on N₂O generation.The cold and hot N₂O emission concentrations of G25 gas with high N₂ conten were higher than those of LNG and CNG,and the weighted specific emission was 15.3 mg·kWh^-1,9.6mg·kWh^-1,and 7.5 mg·kWh^-1,respectively.N₂O generation was closely related to temperature,and the main generation interval was between 160～350℃.High temperature inhibited N2O generation.There was a competitive relationship between N₂O and NH₃ generation,and the NH₃ generation increased when the temperature was higher than 400℃.This study can provide data reference for the source control of N₂O pollution in heavy-duty gas engine.更多还原