张腾，谭建伟，田茂军，韩文涛，周伟伟，李云强.天然气发动机氨排放控制应用研究[J].内燃机工程,2021,42(1):47-52.
天然气发动机氨排放控制应用研究
Application Study on NH3 Emission Control of Natural Gas Engines
DOI：10.13949/j.cnki.nrjgc.2021.01.008
关键词:氨排放  三元催化器  天然气发动机  控制技术方案
Key Words:NH3 emission  three way catalyst(TWC)  natural gas engine  control technical scheme
基金项目:国家重点研发计划项目（2016YFC0204906）
作者单位
张腾，谭建伟，田茂军，韩文涛，周伟伟，李云强 1.潍柴西港新能源动力有限公司，潍坊 261061；2.北京理工大学 机械与车辆学院，北京 100081；3.中国汽车工程研究院股份有限公司，重庆 401122；4.潍柴动力股份有限公司，潍坊 261061 
摘要点击次数: 2984
全文下载次数: 1267
摘要:选择满足国六排放标准的天然气发动机，用全流稀释排放设备采集了发动机常用工况的排放数据并分析了发动机过量空气系数、催化器温度及发动机尾气中CO、NOx等污染物体积浓度对NH3排放的影响并提出控制NH3排放的方法。研究结果表明：当发动机过量空气系数大于0.965时，发动机尾气中NH3的排放随过量空气系数增大而逐渐降低；发动机尾气排放污染物CO对NH3的排放量影响较大，在一定范围内CO的体积浓度与NH3的排放量成正相关，但是NOx的体积浓度与NH3的排放量没有明显的对应关系。另外，三元催化器（three way catalyst, TWC)包裹保温材料后,发动机尾气中NH3的排放随着催化器温度的升高而降低。在3种控制天然气发动机尾气中NH3排放的技术中，当前建议选择两级式TWC技术方案对天然气发动机NH3排放进行控制处理，待逃逸氨催化器（ammonia slip catalyst， ASC）适应天然气发动机发展后,TWC+ASC可以成为良好的排放控制技术方案。
Abstract:Using a natural gas engine emitted to CN Ⅵ emission standard, the engine’s emission data under normal operating conditions were collected by a full-flow dilution system, and the influence of excess air ratio, catalyst temperature, and CO and NOx emission concentrations on NH3 emissions was analyzed. And on this basis, several methods for controlling NH3 emission were proposed. Results show that when the excess air ratio is greater than 0.965, NH3 emission will gradually decrease, while CO emission has a greater impact on NH3 emission, causing NH3 emission to show a positive growth with increased CO concentration within a certain range. However, there is no obvious relationship between NH3 emission and NOx emission. Moreover, when the three-way catalytic(TWC) converter system is wrapped with thermal insulation material, NH3 emission decreases with the increase of catalyst temperature. In view of this, among the 3 kinds of technologies for controlling NH3 emission from natural gas engines,it is currently recommended to use two-stage TWC technology to control the NH3 emissions of natural gas engines. When an applicable ammonia slip catalyst(ASC) can be successfully developed to eliminate NH3 escaped from TWC aftertreatment system, the use of TWC plus ASC will be a preferred solution for the emission control of natural gas engines in the future.
查看全文  HTML   查看/发表评论