含杂质二氧化碳实际气体干气密封性能研究

doi:10.11949/0438-1157.20191556

摘要/Abstract

摘要：

基于EOS-CG模型和GERG-2008模型计算含杂质二氧化碳混合气体的密度，基于CO₂-Pedersen模型计算混合气体的黏度。利用模型计算数据拟合获得含杂质二氧化碳混合气体密度、黏度与压力的关系式，用以描述混合气体的实际行为以及黏度随压力变化的规律。采用有限差分法求解稳态雷诺方程，得到了纯二氧化碳和含杂质二氧化碳干气密封开启力、泄漏率以及气膜刚度，并分析了杂质对二氧化碳干气密封性能(开启力、泄漏率、气膜刚度)的影响。考虑的变量有端面平均线速度、气膜厚度、进口温度以及进口压力等。结果表明：当进口压力为15.26 MPa，进口温度为363.15 K，线速度为74.030 m/s，气膜厚度为3.05 μm时，含杂质二氧化碳干气密封开启力和泄漏率都小于纯二氧化碳干气密封开启力和泄漏率，且杂质含量越多，差别越明显；杂质对二氧化碳干气密封开启力、泄漏率、气膜刚度的影响随端面平均线速度的增大而增大；对泄漏率、气膜刚度的影响随气膜厚度的增加而减小；对开启力、泄漏率、气膜刚度的影响随进口温度的增大而减小；对开启力的影响随进口压力的增大先减小，再增大，最后减小，对泄漏率的影响随进口压力的增大先增大后减小，对气膜刚度的影响随进口压力的增大先减小后增大。

关键词: 杂质, 二氧化碳, 实际气体, 干气密封, 黏度, 数值分析

Abstract:

Based on the EOS-CG model and GERG-2008 model, the density of the mixed carbon dioxide gas containing impurities is calculated, and the viscosity of the mixed gas is calculated based on the CO₂-Pedersen model. The relationship between density, viscosity and pressure of pure carbon dioxide and mixed gas are obtained by fitting the calculated data of these models to describe the real gas behavior and the law of viscosity changing with pressure of pure carbon dioxide and mixed gas. The steady-state Reynolds equation is solved by using the finite difference method, and the opening force, leakage rate and film stiffness of the dry gas seal lubricated by pure carbon dioxide or carbon dioxide with impurities are obtained, and the influence of impurities on the performance (opening force, leakage rate, film stiffness) is also analyzed. The variables considered include the average linear velocity of the end face, film thickness, inlet temperature, and inlet pressure. The results show that when inlet pressure is 15.26 MPa, and inlet temperature is 363.15 K, and linear velocity of the end face is 74.030 m/s, and film thickness is 3.05 μm, both the opening force and leakage rate of the dry gas seal lubricated by carbon dioxide with impurities are lower than those of pure carbon dioxide dry gas seal. The more impurities content, the more obvious the difference. The effect of impurities on the opening force, leakage rate, and film stiffness of the carbon dioxide dry gas seal increases with the increasing of the averaged linear velocity of the end face. The effect on the leakage rate and film stiffness decreases with the increasing of the film thickness. The effect on the opening force, leakage rate, and film stiffness decreases with the increasing inlet temperature. The influence on the opening force of carbon dioxide dry gas seal decreases firstly, then increases, and finally decreases with the increasing of the inlet pressure, and the influence on the leakage rate of carbon dioxide dry gas seal increases firstly and then decreases with the increasing of the inlet pressure, and the influence on the film stiffness decreases firstly and then increases with the increasing of the inlet pressure.

Key words: impurity, carbon dioxide, real gas, dry gas seal, viscosity, numerical analysis

中图分类号:

TH 117

陈维, 宋鹏云, 许恒杰, 孙雪剑. 含杂质二氧化碳实际气体干气密封性能研究[J]. 化工学报, 2020, 71(5): 2215-2229.

Wei CHEN, Pengyun SONG, Hengjie XU, Xuejian SUN. Effects of the real-gas characteristics of carbon dioxide with impurities on the dry gas seal performance[J]. CIESC Journal, 2020, 71(5): 2215-2229.

图/表 21

参考文献 33

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Case	CO₂	CH₄	N₂	O₂	Ar	CO	H₂
case 1^[22]	0.94923	0.006261	0.0141	0.008007	0.0121	0.002127	0.008175
case 2^[18]	0.85	0	0.058	0.0473	0.0447	0	0
case 3^[23]	0.7567	0	0.1563	0.0625	0.0245	0	0

Case	CO₂	CH₄	N₂	O₂	Ar	CO	H₂
case 1^[22]	0.94923	0.006261	0.0141	0.008007	0.0121	0.002127	0.008175
case 2^[18]	0.85	0	0.058	0.0473	0.0447	0	0
case 3^[23]	0.7567	0	0.1563	0.0625	0.0245	0	0

介质	a₁	a₂	a₃	a₄×10⁴	a₅×10⁴	a₆×10⁶	a₇×10⁷
CO₂	-0.03954	14.7126	0.25240	559.570	-68.1477	624.333	-196.379
case1	-0.00445	14.2896	0.31808	197.799	-15.2426	195.270	-76.3254
case2	0.00545	14.0039	0.29880	33.9825	5.17511	-9.69194	-10.3480
case3	0.00391	13.4536	0.24557	1.16314	5.29879	-34.0508	2.60187

介质	a₁	a₂	a₃	a₄×10⁴	a₅×10⁴	a₆×10⁶	a₇×10⁷
CO₂	-0.03954	14.7126	0.25240	559.570	-68.1477	624.333	-196.379
case1	-0.00445	14.2896	0.31808	197.799	-15.2426	195.270	-76.3254
case2	0.00545	14.0039	0.29880	33.9825	5.17511	-9.69194	-10.3480
case3	0.00391	13.4536	0.24557	1.16314	5.29879	-34.0508	2.60187

介质	b₁	b₂×10²	b₃×10³	b₄×10⁴	b₅×10⁶
CO₂	17.9820	9.71547	5.24826	17.3632	60.0045
case1	18.1875	7.81223	9.01788	14.5182	23.5871
case2	18.7157	6.68971	10.1825	12.0689	-5.21244
case3	18.9892	5.92823	10.6680	8.99668	-13.7208