燃气发动机低NO_(X)排放技术路线研究

Research on Low NO_(X) Emission Technology Route of Gas Engine

为实现低NO_(X)排放,需对传统的发动机进行技术改进与硬件升级。CARB(加州空气资源委员会)联合SwRI(美国西南研究院)对燃气发动机进行了一些调查和研究,展示了能够将NO_(X)排放限制在0.02g/bhp-hr的系统[1-4]。同时采用不同的测试循环来检测氨(NH_(3))、甲烷(CH_(4))、一氧化碳和碳氢化合物的排放。本文主要采用后处理系统快速启动和优化空燃比控制的方式减少NO_(X)的排放。具体实现采用适配的后处理催化器、高精度控制的发动机零部件及高鲁棒性的稳态和瞬态标定数据等。

In order to achieve lower NO_(X)emission,technical changes and hardware upgrades may be added to traditional engines.CARB(California Air Resources Board)associated SwRI has done some investigation and research on Nature Gas engine,demonstrating systems capable of the target NO_(X)emissions limit of.02 g/bhp-hr[1-4].Different test cycles were used to detect ammonia(NH_(3)),methane(CH_(4)),carbon monoxide and hydrocarbon emissions.there are mainly two functions for NO_(X)reduction,lighting off the after-treatment quickly to achieve high efficiency and optimizing air-fuel ratio control.To achieve that,other options are identified-a suitable slice of aftertreatment catalysts,useful engine components to make air-fuel ratio(AFR)control well,highly robustness of steady state and transient calibration data,and so on.