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Dynamic behavior and difference pressure control of difference pressure regulator for dry gas seals
Mechanical Systems and Signal Processing ( IF 7.9 ) Pub Date : 2021-08-25 , DOI: 10.1016/j.ymssp.2021.108350
Andriy V. Zahorulko 1, 2 , Yong-Bok Lee 2, 3
Affiliation  

As a result of the research work based on comprehensive numerical and experimental studies, an analytical method for predicting direct action gas difference pressure regulator (DPR) characteristics for dry gas seal (DGS) system allowing to build up from the possible mode of dynamic instability and to ensure the maintenance of required difference pressure for the overall operating range of compressor has been developed. The method of static and dynamic characteristics analysis of the regulator is based on solving equations of the mass flow rates and the forces acting on the slide valve balances, the single-mass dynamic model of the movable part and the mass flow rates balance in the upper and lower chambers with the use of the analytical methods of the automatic control theory (ACT). The experimental verifications of the single-seated and the double-seated DPR designs with the inlet pressures of 9.28, 6.98, 5.0, 3.2 MPa have been satisfactory agreed with the calculation results. So at difference pressure on a slide valve more than 2.4 MPa with constant external actions, a loss of stability of the movable part of the DPR may occur. The damping chamber with the laminar flow restrictor, at a suitable choice of its geometry, provides the necessary attenuation of the vibration process. The conductivity of the feeding channel has a significant influence on the static characteristics of the DPR. Under the condition of the inlet restrictor significant resistance, it is provided a rather narrow range of the variations for the difference pressure across the slide valve.



中文翻译:

干气密封差压调节器的动态特性及差压控制

作为基于综合数值和实验研究的研究工作的结果,一种预测干气密封 (DGS) 系统的直接作用气差压力调节器 (DPR) 特性的分析方法允许从可能的动态不稳定模式和确保在压缩机的整个运行范围内维持所需的压差。调节器静动态特性分析的方法是基于求解质量流量方程和作用在滑阀平衡上的力、活动部件的单质量动力学模型和上部质量流量平衡的方法。和下室使用自动控制理论(ACT)的分析方法。入口压力分别为 9.28、6.98、5.0、3.2 MPa 的单座和双座 DPR 设计的实验验证与计算结果一致。因此,在外部作用恒定的情况下,滑阀上的压差超过 2.4 MPa,DPR 的活动部分可能会失去稳定性。具有层流限制器的阻尼室,在其几何形状的合适选择,提供了振动过程的必要衰减。馈电通道的电导率对 DPR 的静态特性有显着影响。在入口限流器阻力较大的情况下,滑阀两端的压差变化范围较窄。2 MPa 已令人满意地同意计算结果。因此,在外部作用恒定的情况下,滑阀上的压差超过 2.4 MPa,DPR 的活动部分可能会失去稳定性。具有层流限制器的阻尼室,在其几何形状的合适选择,提供了振动过程的必要衰减。馈电通道的电导率对 DPR 的静态特性有显着影响。在入口限流器阻力较大的情况下,滑阀两端的压差变化范围较窄。2 MPa 已令人满意地同意计算结果。因此,在外部作用恒定的情况下,滑阀上的压差超过 2.4 MPa,DPR 的活动部分可能会失去稳定性。具有层流限制器的阻尼室,在其几何形状的合适选择,提供了振动过程的必要衰减。馈电通道的电导率对 DPR 的静态特性有显着影响。在入口限流器阻力较大的情况下,滑阀两端的压差变化范围较窄。DPR 的可移动部分可能会失去稳定性。具有层流限制器的阻尼室,在其几何形状的合适选择,提供了振动过程的必要衰减。馈电通道的电导率对 DPR 的静态特性有显着影响。在入口限流器阻力较大的情况下,滑阀两端的压差变化范围较窄。DPR 的可移动部分可能会失去稳定性。具有层流限制器的阻尼室,在其几何形状的合适选择,提供了振动过程的必要衰减。馈电通道的电导率对 DPR 的静态特性有显着影响。在入口限流器阻力较大的情况下,滑阀两端的压差变化范围较窄。

更新日期:2021-08-26
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