运行工况对超临界CO2干气密封端面热力过程及稳态性能影响研究

doi:10.11949/0438-1157.20241240

摘要/Abstract

摘要：

超临界CO₂压缩机干气密封因密封介质在临界点工况附近的物性特殊性和高参数化，密封间隙内介质流动呈现出多相流动、高度湍流化和物性畸变特征。以微段组合型槽干气密封为研究对象，构建了轴向力平衡条件下考虑实际流体效应的超临界CO₂干气密封热动力润滑相变仿真模型，提出了密封端面热力过程表征方法，研究了转速、进气压力和进气温度等运行工况参数对超临界CO₂干气密封端面热力过程、流场参数和稳态性能的影响。结果表明：进气温度的提高对于抑制密封端面液相凝析效果显著，而转速和进气压力的增大只能抑制槽区液相凝析，增大端面非液相区面积，但对密封坝气液两相区影响不大，当进气温度达到320K和340K时，端面纯液相区和气液两相区先后消失；提高非液相区面积，对于增大密封气膜刚度是有利的。

关键词: 超临界CO₂, 干气密封, 相变特性, 工况参数

Abstract:

The dry gas seal of a supercritical CO₂ compressor exhibits unique properties and high parameterization near the critical point. The medium flow demonstrates characteristics of multiphase flow, intense turbulence, and property distortion in the sealing gap. Focusing on a segmented micro-grooved dry gas seal, a thermo-hydrodynamic lubrication phase-change simulation model is constructed for supercritical CO₂ dry gas seals, considering real fluid effects under axial force equilibrium. A method to characterize the thermodynamic processes on the seal face is proposed, and the effects of operating conditions, including rotating speed, inlet pressure, and inlet temperature, on the thermodynamic processes, flow field parameters, and steady-state performance of the seal are analyzed. Results indicate that increasing the inlet temperature significantly suppresses liquid-phase condensation on the seal face, while increasing the rotating speed and inlet pressure can only inhibit liquid-phase condensation in the groove region, expanding the non-liquid phase area of the seal face, while have a little effect on the gas-liquid two-phase area of the sealing dam. When the inlet temperature reaches 320K and 340K, the pure liquid-phase and gas-liquid two-phase regions on the face sequentially disappear. Expanding the non-liquid phase area benefits the enhancement of the gas film stiffness of the seal.

Key words: supercritical CO₂, dry gas seal, phase transformation characteristics, operating parameters

中图分类号:

TH117.2

江锦波, 陈竹鑫, 肖洋溢, 彭新, 陈源, 于辰, 孟祥铠, 彭旭东. 运行工况对超临界CO₂干气密封端面热力过程及稳态性能影响研究[J]. 化工学报, DOI: 10.11949/0438-1157.20241240.

Jinbo JIANG, Zhuxin CHEN, Yangyi XIAO, Xin PENG, Yuan CHEN, Chen YU, Xiangkai MENG, Xudong PENG. Study on the influence of operating conditions on the thermal process and steady state performance of supercritical CO₂ dry gas seal[J]. CIESC Journal, DOI: 10.11949/0438-1157.20241240.

图/表 21

图1 sCO2干气密封结构及进气系统示意图

Fig.1 sCO2 dry gas seal structure and intake system schematic diagram

图2 干气密封端面型槽几何参数定义示意图

Fig.2 The geometrical parameter definition of surface groove of dry gas seal

图3 补偿静环轴向力分析

Fig.3 The axial force analysis of floating stationary ring

图4 动环和静环计算域及其传热边界条件示意图

Fig.4 Schematic diagram of the calculation domains of the rotating ring and the stationary ring and their heat transfer boundary conditions.

图5 考虑轴向力平衡的密封流动传热特性耦合计算流程图

Fig.5 Calculation flow chart of coupled program of flow and heat transfer considering the axial force balance

表1 sCO2干气密封运行工况及结构参数缺省值

Table 1 Default values of working conditions and structural parameters of sCO2 dry gas seal

名称与单位	数值	名称与单位	数值
密封端面内径r_i/mm	58.42	密封端面外径r_o/mm	77.78
槽数N_g	12	周向槽宽比δ	0.5
径向槽长比α	0.6	槽深h_g/μm	5
进口螺旋角β₁/°	50	中间螺旋角β₂/°	30
出口螺旋角β₃/°	30	转速n/ rpm	10000
进气温度T_in/K	305.0	进气压力p_in/MPa	10
弹簧比压p_sp/MPa	0.05	平衡比B	0.80

图6 网格数对sCO2干气密封密封性能影响

Fig.6 The influence of grid number on sealing performance of sCO2 dry gas seal

图7 干气密封温度、压力、质量分数的程序计算结果与文献值对比

Fig.7 The comparison of film pressure, temperature and mass fraction distribution of dry gas seal between calculated values and literature values

图8 干气密封开槽端面三个主要分区示意图

Fig.8 The three important parts of grooved surface in dry gas seal

图9 压焓图和温压图上干气密封端面介质热力过程

Fig.9 The thermodynamic process of dry gas seal showed in p-H diagram and p-T diagram

图10 不同进气温度下压焓图中干气密封介质热力过程

Fig.10 The thermodynamic process of dry gas seal in p-H diagram at different outer temperature

图11 不同进气温度对CO2径向平均密度与黏度的影响

Fig.11 Effect of outer temperature on the radial average density and viscosity of CO2

图12 不同进气温度下密封端面流体压力、温度及相态云图分布

Fig.12 The distribution of film pressure， temperature and phase-state in the surface at different inlet tempeature

图13 不同进气温度sCO2干气密封稳态性能和相变区域面积变化

Fig.13 Steady-state performance and phase region area of sCO2 dry gas seal at different outer temperature

图14 压焓图中不同转速下干气密封热力过程

Fig.14 The thermodynamic process of dry gas seal in p-H diagram under different rotating speed

图15 不同转速下密封端面流体压力、温度及相态云图分布

Fig.15 The distribution of film pressure， temperature and phase-state in the seal face at different rotating speed

图16 不同转速sCO2干气密封稳态性能和相变区域面积变化

Fig.16 Steady-state performance and phase region area of sCO2 dry gas seal at different rotating speed

图17 不同进气压力下压焓图上干气密封介质热力过程

Fig.17 The thermodynamic process of dry gas seal in p-H diagram at different outer pressure

图18 不同进气压力对CO2径向平均密度与黏度的影响

Fig.18 Effect of outer pressure on the radial average density and viscosity of CO2

图19 不同进气压力下密封端面流体压力、温度及相态云图分布

Fig.19 The distribution of film pressure， temperature and phase-state in the seal face at different outer pressure

图20 不同进气压力下sCO2干气密封稳态性能和相变区域面积变化

Fig.20 Steady-state performance and phase region area of sCO2 dry gas seal at different outer pressure

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运行工况对超临界CO₂干气密封端面热力过程及稳态性能影响研究

Study on the influence of operating conditions on the thermal process and steady state performance of supercritical CO₂ dry gas seal

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