提升阀开启过程内部动态特性研究

Study of the Internal Dynamic Characteristics of a Poppet Valve in Its Opening Process

针对电站锅炉蒸汽吹灰器低能耗高效率的要求,对吹灰器提升阀的工作原理及开启过程的动态特性进行理论分析及仿真研究。基于Immersed solid(浸入实体)方法,建立提升阀内部流体域及浸入实体域模型,运用ANSYS CFX(有限元分析)软件对提升阀模型进行了开启过程的动态仿真模拟,获得了阀门内部湍动能及流速分布等流场信息。研究表明:当入口压力由2 MPa增大至10 MPa时,阀门流量增加了61.5%;阀座与调压盘环缝出口处的湍动能和流速分别增加了68.8%和63.5%。

To meet the requirements for steam soot blowers in utility boilers to have a low energy consumption and high efficiency,a theoretical analysis and simulation study were performed of the working principles of a poppet valve in a soot blower and the dynamic characteristics during its opening process. Based on the immersed solid method,models for fluid domains and immersed solid ones inside a poppet valve were established and by employing the software ANSYS CFX,a dynamic simulation of a poppet valve model during its opening process was conducted,obtaining such information about the flow field as turbulent flow kinetic energy and flow speed distribution inside the valve. It has been found that when the pressure at the inlet increases from 2 MPa to 10 MPa,the flow rate of the valve will increase by 61. 5%. The turbulent flow kinetic energy and flow speed at the outlet of the annular gap between the valve seat and the pressure regulation disk will increase by 68. 8% and 63. 5% respectively.