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Performance of Spiral Groove Dry Gas Seal for Natural Gas Considering Viscosity-Pressure Effect of the Gas

机译：考虑气体黏压效应的天然气螺旋槽干气密封性能

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摘要

Centrifugal compressors used for transporting natural gas are usually equipped with dry gas seals. The working medium of the seal is usually the delivered gas, that is, natural gas. In this paper, the natural gas viscosity-pressure equation is derived from the Pederson mixed gas viscosity model and Lucas viscosity-pressure model, and the real gas property of natural gas is expressed by Redlich-Kwong equation. The gas film pressure governing equations proposed by Muijderman for narrow grooves are modified and solved for the seal faces. The influences of natural gas viscosity-pressure effect on the sealing characteristics, such as leakage rate and opening force, of spiral groove dry gas seal are analyzed. Results show that the viscosity-pressure effect has significant influence on spiral groove dry gas seal. This effect reduces the leakage rate but increases the opening force, compared to the situation without considering the viscosity-pressure effect. With the pressure up to 4 MPa, the viscosity-pressure effect of natural gas is weak and negligible. As the pressure increases, the viscosity-pressure effect increases. At 12 MPa, the relative deviations of leakage rate and opening force caused by the viscosity-pressure effect are respectively -30.6% and 1.65%. Therefore, the analyses indicate that the viscosity-pressure effect of natural gas needs to be considered when used in high pressure situation.
机译：用于运输天然气的离心压缩机通常配备有干气密封件。密封件的工作介质通常是输送的气体，即天然气。本文从Pederson混合气体黏度模型和Lucas黏度-压力模型推导了天然气黏度-压力方程，并通过Redlich-Kwong方程表达了天然气的真实气体性质。修改了Muijderman提出的用于窄槽的气膜压力控制方程，并求解了密封面。分析了天然气的黏度-压力效应对螺旋槽干气密封件密封性能的影响，如泄漏率和开启力。结果表明，黏压效应对螺旋槽干气密封具有重要影响。与不考虑粘度-压力效应的情况相比，该效应降低了泄漏率，但增加了打开力。在高达4 MPa的压力下，天然气的黏压效应微弱且可忽略不计。随着压力增加，粘压力效应增加。在12 MPa时，由粘压效应引起的泄漏率和开启力的相对偏差分别为-30.6％和1.65％。因此，分析表明在高压条件下使用天然气时需要考虑天然气的黏压效应。

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