As the performance of an air-cooled condenser is apt to be affected by the fluctuating ambient condition, some difficulties are brought to the use of a steam feeding water pump in an air-cooled unit. This paper introd...As the performance of an air-cooled condenser is apt to be affected by the fluctuating ambient condition, some difficulties are brought to the use of a steam feeding water pump in an air-cooled unit. This paper introduces a new design of for steam feeding the water pump of an air-cooled unit using the back-pressure steam turbine as the prime motor. Using variable condition analysis on a 600 MW direct air-cooled unit, and with consideration of the effect on the ambient conditions, the feasibility, economy, and adaptability of the design are verified.展开更多
水工建筑物伸缩缝的破坏及渗漏问题会直接影响水工结构自身的安全稳定。本文基于南水北调穿黄隧洞工程实际背景,引入基于内聚力(Cohesive Zone Model)单元界面破坏有限元模型,进行了伸缩缝嵌缝材料在背水压作用下的仿真分析,并将其结果...水工建筑物伸缩缝的破坏及渗漏问题会直接影响水工结构自身的安全稳定。本文基于南水北调穿黄隧洞工程实际背景,引入基于内聚力(Cohesive Zone Model)单元界面破坏有限元模型,进行了伸缩缝嵌缝材料在背水压作用下的仿真分析,并将其结果与室内压水试验的应变-荷载数据进行对比,给出了适合于聚脲基复合防渗体系嵌缝内聚力单元的断裂能。同时,分析计算了伸缩缝宽度及嵌缝深度对结构抵抗水压能力的影响,证明所取参数的正确性。进一步分析了伸缩缝变形和水压力作用条件下的仿真结果,给出了伸缩缝变形、伸缩缝宽度、嵌缝深度及承载能力之间的关系。本文结果可为伸缩缝的结构设计提供指导。展开更多
文摘As the performance of an air-cooled condenser is apt to be affected by the fluctuating ambient condition, some difficulties are brought to the use of a steam feeding water pump in an air-cooled unit. This paper introduces a new design of for steam feeding the water pump of an air-cooled unit using the back-pressure steam turbine as the prime motor. Using variable condition analysis on a 600 MW direct air-cooled unit, and with consideration of the effect on the ambient conditions, the feasibility, economy, and adaptability of the design are verified.
文摘水工建筑物伸缩缝的破坏及渗漏问题会直接影响水工结构自身的安全稳定。本文基于南水北调穿黄隧洞工程实际背景,引入基于内聚力(Cohesive Zone Model)单元界面破坏有限元模型,进行了伸缩缝嵌缝材料在背水压作用下的仿真分析,并将其结果与室内压水试验的应变-荷载数据进行对比,给出了适合于聚脲基复合防渗体系嵌缝内聚力单元的断裂能。同时,分析计算了伸缩缝宽度及嵌缝深度对结构抵抗水压能力的影响,证明所取参数的正确性。进一步分析了伸缩缝变形和水压力作用条件下的仿真结果,给出了伸缩缝变形、伸缩缝宽度、嵌缝深度及承载能力之间的关系。本文结果可为伸缩缝的结构设计提供指导。
