Precision blasting excavation of rock face beam in underground hydropower station under complex geological conditions

To deal with the construction difficulties of Xiangjiaba underground hydropower station,such as complex geological conditions,narrow rock bench,high loading,high quality requirements and urgent time limit,the project adopted the concept of precision blasting.The explosive energy and rock mass fragmentation were well controlled by taking reasonable excavation sequence,designing steel pipe drilling frame,the additional techniques of double layer smooth blasting,evenly micro charge,staggered arrangement of boreholes and pre-stressed anchors.These technologies ensured the excavation quality of the rock face beam,achieving successful blasting results:Semi hole ratio was 100%in Ⅱ surrounding rock,99.2%in Ⅲ surrounding rock and 90%~ 97.3%in Ⅳ surrounding rock;underbreak was avoided and the average backbreak was only2.9 cm;the unevenness was 0 ~ 4 cm;the influence depth of blasting and unloading was 0.2 ~ 0.7 cm.

爱默生增强其0vation仿真器套件功能

近日，爱默生过程管理宣布，它已经成功地将附加的虚拟控制器技术添加到其Ovation仿真套件的功能中，从而显示了其作为电力行业仿真解决方案的最主要供应商的风范，借此也使得多虚拟器的集成方案成为可能。

650MW汽轮机发电机组跳闸保护系统性能分析及优化

汽轮机跳闸保护系统是当汽轮机运行异常,且汽轮发电机控制系统无法控制汽轮机系统在正常范围内时,为防止损害汽轮发电机系统而使汽轮机跳闸、关闭所有进汽阀的系统,是核电厂安全稳定运行的保障。本文主要针对中核核电秦山二厂扩建65万k W单元3、4号机组汽轮机跳闸保护系统的性能分析,且加入了优化分析及未来发展趋势的探讨与设想。