Spring Stiffness Selection Criteria for Nozzle Check Valves Employed in Compressor Stations
Spring Stiffness Selection Criteria for Nozzle Check Valves Employed in Compressor Stations
复制标题
压缩机站喷嘴止回阀的弹簧刚度选择标准
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
K. Botros
中科院分区：
文献类型：
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作者：
K. Botros
喷嘴式止回阀通常在压缩机站的三个位置使用：压缩机出口，站排放和站旁路。这些阀的基本设计概念是基于通过阀内部几何形状产生会聚发散流，使得在完全打开位置处在对应于止回阀盘的后部的位置处实现最小面积。这将确保最大的流体动力系数，使阀门在最小流量下完全打开。弹簧力和刚度决定了这种类型止回阀的性能，并影响压缩机站的整体运行和完整性。本文研究了各种弹簧特性和刚度对压缩机和电站流量特性的影响。结果表明，当弹簧力大于最小流量时的最大水动力时，阀瓣将不能处于全开位置，从而导致阀瓣颤振，并可能导致阀内组件之间的周期性高速冲击。这可能会导致止回阀自毁，进而导致压缩机装置本身损坏的风险。本文还指出，单元止回阀的弹簧选择标准与站用止回阀和旁路止回阀的弹簧选择标准不同。一个案例研究的实际现场数据从高压比压缩机站采用这种类型的止回阀的例子来说明相关的动态现象和流体结构的内部组件内的相互作用的止回阀。
Nozzle type check valves are often employed in compressor stations in three locations: compressor outlet, station discharge, and station bypass. The fundamental design concept of these valves is based on creating a converging diverging flow through the valve internal geometry such that a minimum area is achieved at a location corresponding to the back of the check valve disk at the fully open position. This will ensure maximum hydrodynamic force coefficient which allows the valve to be fully open with minimum flow. Spring forces and stiffness determine the performance of this type of check valves and impact the overall operation and integrity of the compressor station. This paper examines the effects of various spring characteristics and stiffness in relation to the compressor and station flow characteristics. The results show that when the spring forces are higher than the maximum hydrodynamic force at minimum flow, the disk will not be at the fully open position, which will give rise to disk fluttering and potential for cyclic high velocity impact between components of the internal valve assembly. This could lead to self destruction of the check valve and subsequent risk of damage to the compressor unit itself. The paper also points to the fact that the spring selection criteria for a unit check valve are different than that for station and bypass check valves. An example of a case study with actual field data from a high pressure ratio compressor station employing this type of check valves is presented to illustrate the associated dynamic phenomena and fluid-structure interaction within the internal assembly of the check valve.