基于计算流体力学的抽水蓄能电站球阀过流特性研究

发布时间：2018-05-01 10:14

本文选题：抽水蓄能 + 球阀　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：抽水蓄能电站是利用电力负荷低谷时的电能抽水至上水库,在电力负荷高峰期再放水至下水库发电的水电站,又称蓄能式水电站。随着国内核电及风电、太阳能等清洁能源电站的投建,电网对调峰调频电源的需求趋于紧迫,国内抽水蓄能电站建设明显加速。作为抽水蓄能电站建设可行性研究阶段的一项重要工作内容,水力过渡过程调节保证设计,对于电站运行的安全性具有至关重要的意义。研究球阀参与过渡过程调节的安全性以及优化球阀、导叶协联关闭规律对于提高抽水蓄能电站建设的可靠性、确保已建成电站运行的安全性性具有重要意义。为研究抽水蓄能电站球阀参与过渡过程调节,本文采用CFD方法,分别开展了球阀过流特性计算及分析、甩负荷球阀动水关闭过程受力计算及分析等研究工作,获得了球阀在各开度下对应的流量系数、局部阻力系数,以及动水关球阀过程球阀的受力情况。以上研究成果对于降低球阀设计开发费用,提高电站设计准确性,运行安全性具有重要的意义。
[Abstract]:Pumped-storage power station is a kind of hydropower station which uses the electric energy at the bottom of the power load to pump water to the lower reservoir during the peak period of the power load, which is also called the storage type hydropower station. With the construction of domestic nuclear power, wind power, solar energy and other clean energy power stations, the demand for peak-shaving and frequency modulation power is becoming urgent, and the construction of domestic pumped storage power stations is accelerating obviously. As an important part of the feasibility study on the construction of pumped storage power station, the design of hydraulic transition process regulation guarantee is of great significance for the safety of power station operation. It is of great significance to study the safety of ball valve participating in the adjustment of transition process and to optimize the ball valve and the closing rule of the United guide vane for improving the reliability of the construction of pumped storage power station and ensuring the safety of the operation of the completed power station. In order to study the role of ball valve in the process of transition regulation in pumped storage power station, the CFD method is used to calculate and analyze the overflow characteristics of ball valve, and to calculate and analyze the stress of ball valve in the course of dynamic water closure of load rejection ball valve. The flow coefficient, the local resistance coefficient and the stress condition of the ball valve during the course of the dynamic shutoff ball valve are obtained. The above research results are of great significance to reduce the cost of ball valve design and development, improve the accuracy of power plant design and operation safety.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV743;TV134

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