摘要
针对某船用柴油机,在D2试验循环模式下进行原机和加装SCR系统后的性能对比试验,分析SCR反应器在无尿素喷射时对柴油机排气特性和经济性的影响,同时还分析按氮氨比为1∶1进行尿素喷射时SCR系统的工作性能。试验结果表明:柴油机安装SCR系统后,排气背压和排气温度均有所上升;经济性略有下降,额定工况下降低幅度在1%左右;虽然增压器后NOX排气浓度增大,但NOX质量流量下降幅度较大,额定工况下降幅度为12.3%,尿素基本喷射量标定计算应以加装SCR反应器后的柴油机排气参数为依据;NOX加权比排放由原机的12.63 g/k Wh降低到11.52 g/k Wh,降低了8.7%。按氮氨比为1∶1的比例进行尿素喷射时,SCR系统能满足Tire III的NOX排放限值要求。研究结果可为SCR系统设计和尿素喷射量的标定提供一定的指导依据。
Exhaust emissions and engine performance characteristics of a marine diesel engine equipped with SCR （selective catalytic reduction） catalytic converter that had not urea injection and without SCR system were compared according to D2 cycle （generation application） to study the influence of SCR. Meanwhile, the performance of the SCR emission control systems is evaluated by injecting urea according as the proportion of NH3 and NOx is 1：1 ratio. The results show that the EBP （exhaust back pressure） and temperature of the engine with SCR catalyst, compared those without SCR catalyst, are risen; the fuel consumption rate is increased by about 1% at 100% power condition point. Although the concentration of NOx is increased, the mass flow of NOx can be reduced by about 12. 3% at 100% power condition point. The injecting mass of urea shouM be calculated on the emission parameters of marine diesel engines with SCR. The specific emission of NOx decreases from 12.63 g/kWh to 11.52 g/kWh, decreased by 8.7%. When the proportion of NH3 and NOx is 1：1 ratio, the NOx emission from the engine with SCR reactor meets the requirement of Tire Ⅲ. The test results eouM give reference for SCR system design and the calibration of urea.
出处
《船舶工程》
CSCD
北大核心
2017年第5期66-70,共5页
Ship Engineering
基金
交通运输部应用基础研究项目(2014329815080)
福建省科技创新平台建设项目(2014H2001)
关键词
船用柴油机
SCR系统
排气背压
匹配性能
试验
marine diesel engine
SCR system
exhaust back pressure
matching performance
trial
