上游泵送机械密封润滑膜固体颗粒沉积特性研究

doi:10.11949/0438-1157.20190992

摘要/Abstract

摘要：

上游泵送机械密封运行中常因固体颗粒沉积而出现动压槽堵塞失效现象，为了对微间隙润滑膜固体颗粒沉积特性进行研究，建立了密封润滑膜三维几何模型和气液固多相流计算模型，应用Mixture模型和DPM模型模拟研究了不同颗粒直径、转速、介质压力、颗粒进口体积分数和润滑膜厚度对固体颗粒沉积特性的影响规律。研究表明：来自润滑膜内径侧固体颗粒的沉积率及沉积区域均与颗粒直径、颗粒进口体积分数、密封工况和润滑膜厚度等参数有关，粒径较小、转速增大、介质压力增大和膜厚减小有利于降低颗粒沉积率；螺旋槽低压区是颗粒沉积的主要部位，且粒径、颗粒进口体积分数、转速和膜厚增大，介质压力降低，使沉积区域明显向外槽根拓展，这是螺旋槽易出现堵塞失效的原因；低转速时易在坝区出现颗粒沉积，非槽区的沉积颗粒呈周向分布。

关键词: 上游泵送机械密封, 润滑膜, 固体颗粒, 沉积特性, 流体力学, 多相流, 数值模拟

Abstract:

During the operation of upstream pumping mechanical seal, the dynamic pressure groove blockage often occurs due to the deposition of solid particles. To study the solid particle deposition characteristics of the micro-gap lubricant film, a three-dimensional geometric model of the seal lubricant film and a gas-liquid-solid multi-phase flow calculation model were established. The Mixture model and DPM model were applied to study the different particle diameter, rotational speed, medium pressure, particle import volume fraction and the lubrication film thickness on the influence of solid particle deposition characteristics. The results show that the deposition rate and deposition area of solid particles from the inner diameter side of the lubrication film are related to the particle diameter, particle import volume fraction, sealing condition and lubrication film thickness. Smaller particle size, larger rotating speed, larger medium pressure and smaller film thickness are beneficial to lower particle deposition rate. The low-pressure area of spiral groove is the main part of particle deposition. With the increase of particle diameter, particle import volume fraction, rotating speed and film thickness, medium pressure decreases and the deposition area obviously extends outward to the root of the groove, which is the reason why the spiral groove is prone to blockage and failure. Particle deposition is easy to occur in dam area and particles in the non-slot area are circumferentially distributed at low rotating speed.

Key words: upstream pumping mechanical seal, lubricating film, solid particles, deposition characteristics, fluid mechanics, multiphase flow, numerical simulation

中图分类号:

TH 117. 2

陈汇龙, 桂铠, 韩婷, 谢晓凤, 陆俊成, 赵斌娟. 上游泵送机械密封润滑膜固体颗粒沉积特性研究[J]. 化工学报, 2020, 71(4): 1712-1722.

Huilong CHEN, Kai GUI, Ting HAN, Xiaofeng XIE, Juncheng LU, Binjuan ZHAO. Study on deposition characteristics of solid particles in lubricating film of upstream pumping mechanical seal[J]. CIESC Journal, 2020, 71(4): 1712-1722.

图/表 17

图1 机械密封端面螺旋槽造型

Fig.1 Face structure of spiral groove mechanical seal

图2 端面润滑膜三维模型

Fig.2 Three-dimensional model of lubricating film

图3 网格无关性检验

Fig.3 Grid independence verification

图4 1/Ng润滑膜网格及边界条件

Fig.4 1/Nglubrication film mesh and boundary conditions

图5 计算流程图

Fig.5 Flow chart of calculation

图6 固体颗粒沉积数量模拟结果对比

Fig.6 Comparison of simulation results of solid particle deposition

图7 连续相流场计算结果

Fig.7 Calculation results of continuous phase flow field

图8 不同颗粒直径下固体颗粒沉积分布

Fig.8 Deposition distribution of solid particles under different particle diameters

图9 颗粒直径对沉积率的影响

Fig.9 Influence of particle diameter on deposition rate

图10 不同转速下固体颗粒沉积分布

Fig.10 Deposition distribution of solid particles under different speed

图11 转速对沉积率的影响

Fig.11 Influence of speed on deposition rate

图12 不同介质压力下固体颗粒沉积分布

Fig.12 Deposition distribution of solid particles under different medium pressure

图13 介质压力对沉积率的影响

Fig.13 Influence of medium pressure on deposition rate

图14 不同颗粒进口体积分数下固体颗粒沉积分布

Fig.14 Deposition distribution of solid particles under different particle import volume fraction

图15 颗粒进口体积分数对沉积率的影响

Fig.15 Influence of particle import volume fraction on deposition rate

图16 不同润滑膜厚度下固体颗粒沉积分布

Fig.16 Deposition distribution of solid particles under different thickness of lubricating film

图17 润滑膜厚度对沉积率的影响

Fig.17 Influence of thickness of lubricating film on deposition rate

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