Study on Startup Characteristics of Dry Gas Seal with Hydrogen-Blended Natural Gas

XIA Yongbo; HUAN Xuanzhou; LI Zhigang; LI Jun

doi:10.7652/xjtuxb202403008

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Study on Startup Characteristics of Dry Gas Seal with Hydrogen-Blended Natural Gas

更新时间：2025-07-09

- Study on Startup Characteristics of Dry Gas Seal with Hydrogen-Blended Natural Gas
- Vol. 58, Issue 3, Pages: 82-94(2024)
- 作者机构：
  
  1. 西安交通大学叶轮机械研究所,西安,710049
  2. 西安热工研究院有限公司,西安,710054
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202403008
  CLC： TH136
- Online First：10 March 2024，
  
  Published：2024
- 稿件说明：
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XIA Yongbo, HUAN Xuanzhou, LI Zhigang, et al. Study on Startup Characteristics of Dry Gas Seal with Hydrogen-Blended Natural Gas[J]. 2024, 58(3): 82-94.
DOI：

XIA Yongbo, HUAN Xuanzhou, LI Zhigang, et al. Study on Startup Characteristics of Dry Gas Seal with Hydrogen-Blended Natural Gas[J]. 2024, 58(3): 82-94. DOI： 10.7652/xjtuxb202403008.

摘要

为评估天然气掺氢对管线压缩机轴端干气密封性能的影响

提出一种考虑阻塞效应的干气密封性能数值预测模型

分析了不同掺氢比下干气密封的静态特性和启动特性。首先

采用空气介质螺旋槽干气密封的气膜压力分布和开启力实验数据

验证了数值模型的可靠性; 然后

针对GE PCL800机型天然气管线压缩机螺旋槽干气密封

分析了4种掺氢比(H

体积分数分别为0、10%、20%、30%)和5种进口压力(4、6、8、10、12 MPa)对干气密封开启力、泄漏量和气膜刚度等静态特性的影响规律; 最后

分析了4种掺氢比和5种进口压力下

转速、进口压力、平衡比和弹簧比压对干气密封启动特性的影响规律。研究结果表明:所提出的干气密封性能数值预测模型能够可靠预测高压差下干气密封出口阻塞效应及其对密封性能的影响; 掺氢比对干气密封开启力、泄漏量和气膜刚度等密封静态特性影响较小; 干气密封开启临界转速随掺氢比的增加而增大(掺氢比增加30%时

开启临界转速增大8.51%～16.90%)

因此天然气掺氢增大了干气密封的开启难度

需设计合适的平衡比和弹簧比压以保证干气密封顺利开启。该研究结果可为掺氢条件下天然气管线压缩机轴端干气密封的高效设计和可靠运行提供理论参考。

Abstract

To evaluate the influence of hydrogen-blended natural gas on dry gas seal(DGS)at the shaft end of pipeline compressor

a numerical prediction model of DGS performance considering choked flow effect is proposed

as well as the static characteristics and the startup characteristics under different hydrogen-blended ratios are analyzed. Firstly

the reliability of the numerical model is verified by the experimental data of gas film pressure distribution and opening force of air med

ium spiral groove DGS. Then

aiming at the spiral groove DGS of GE PCL800 natural gas pipeline compressor

the effects of four hydrogen-blended ratios(volume fraction of H

of 0

10%

20% and 30%

respectively)and five inlet pressures(4

10 and 12 MPa)on the static characteristics are analyzed. Finally

the effects of rotational speed

inlet pressure

balance ratio and spring specific pressure on the startup characteristics are discussed. The results show that the prediction model can predict effectively the influence of choked flow on seal performance under high pressure difference. The hydrogen-blended ratio has little influence on the static characteristics

such as opening force

leakage and gas film stiffness. The critical opening speed(the opening critical speed increases 8.51%—16.90% when the hydrogen blended ratio increases 30%)of DGS increases with the increase of hydrogen-blended ratios and the opening difficulty increases after hydrogen-blending. In addition

choosing appropriate balance ratio and spring specific pressure is beneficial to the smooth opening of DGS. The research work can provide theoretical reference for the efficient design and reliable operation of DGS at the shaft end of natural gas pipeline compressor after hydrogen-blending.

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references

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