Simulation of VGT control based on charge oxygen concentration

A turbocharged diesel engine model was built with the GT-Power software,and experimentally verified.Then two different control variables for the control of the variable geometry turbocharger（VGT）were described,and their distinct effects on engine performance,i.e.NOxand soot emissions and fuel consumption,were simulated and compared on the basis of this model.The results showed that NOxemissions decreased obviously with the increase of exhaust gas recirculation（EGR）rate at constant boost pressure condition,but soot emissions and fuel consumption considerably increased.It was a good way to reduce NOxemissions without increasing fuel consumption and soot emissions when VGT was controlled to maintain the excess oxygen ratio unchanged as EGR rate increases.     

π形接线电能计量缺陷及其解决方案探讨

π形接线是客户35kV及以上受电工程中常用的一种电源引入形式,该接线建设资金少,周期短,即可满足客户供电的可靠性要求,又保持了电网运行方式的灵活性。但就一般设计中的电能计量而言,存在客户计费上无法克服的计量缺陷。本文针对该缺陷进行了详细分析,并通过二次回路改造的方式,提出了具体的解决方案,对电能计量的现场工作,有实际的参考价值。     

无人机倾斜摄影测量技术在油气田工程的应用策略

无人机倾斜测量技术具有测绘速度快、成本低、精度高等优势,在现代测绘领域中,已经受到充分重视,将其应用于油气田工程中,有利于提升油气田工程的开发效率及生产安全性,以及各方面测量结果的准确性。所以,本文主要针对无人机倾斜摄影测量技术,在油气田工程的应用策略进行分析,以供参考。     

首钢高速线材精轧机油膜轴承油的研制与应用

首钢与上海联润滑材料研究抿人同开发ＨＩＲＩ－１２１－１００Ａ高线精轧机油膜不油,以深度精制的石蜡基组分油为基础油,加入抗乳化、抗磨、抗极压、防锈等有效的添加剂。其理化分析和性能评定表明,质量符合研制标准和美国１３６标准,达到国外同类油膜轴承油的先进水平。