葛晓成,李静波,陈本林,等.当量燃烧天然气发动机NH3排放控制策略研究[J].内燃机工程,2021,42(3):86-92.
当量燃烧天然气发动机NH3排放控制策略研究
Research of NH3 Emission Control Strategy for Equivalent Combustion Natural Gas Engine
DOI：10.13949/j.cnki.nrjgc.2021.03.013
关键词:国六排放  天然气发动机  当量燃烧  ASC后处理  NH3排放
Key Words:China VI Emission Standards  natural gas engine  equivalent combustion  ASC post-processing  NH3 emission
基金项目:重庆市重点产业共性关键技术创新专项（cstc2017zdcy-zdyfX0097）
作者单位E-mail
葛晓成* 重庆大学汽车工程学院 gexiaocheng@caeri.com.cn 
李静波 中国汽车工程研究院 国家燃气汽车工程技术中心  
陈本林 中国汽车工程研究院 国家燃气汽车工程技术中心  
王国华 中国汽车工程研究院 国家燃气汽车工程技术中心  
徐中明 重庆大学  
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摘要:为了满足国六标准新增NH3排放的限值要求，本文基于NH3排放生成机理和大量工程试验数据，提出和应用了“微浓空燃比+氨催化器（Ammonia Slip Catalyst , ASC）ASC”控制策略，并在某天然气发动机进行了匹配开发试验，最终发动机满足国六法规要求。试验表明：1）NH3排放来源于三元催化器，并非来源于天然气发动机原始排放。2）5g0.177×10-3g/ftcm3贵金属含量的ASC，可达到72.2％的转化效率，再通过增加贵金属含量，对NH3排放的转化效率无太大影响。3）在0.177×10-35g/ft3cm3贵金属含量的ASC后处理条件下，当空燃比为0.996时，NH3排放物浓度最低，低于国六排放限值。
Abstract:In order to meet the new NH3 emission limits of China VI Emission Standards, a “slightly-rich air-fuel ratio and Ammonia Slip CatalystASC (ASC)” control strategy is developed and applied in this paper, which is based on NH3 emission generation mechanism and a large amount of engineering test data. Besides, a matching development test is carried out on a certain natural gas engine, which is proved to meet the requirements of the China VI Emission Standards. The test results show that: 1) NH3 emissions are derived from the catalytic converter, not from the original emissions of natural gas engines. 2) ASC using 0.177×10-3g/cm35g/ft3 precious metal content can achieve 72.2% conversion efficiency. By increasing the content of precious metals, the conversion efficiency has no great changes. 3) After post-processing of ASC with 0.177×10-3g/cm35g/ft3 precious metal content, NH3 emission reaches the lowest level with Air-fuel ratio being 0.996, which is lower than the standards.
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