螺杆压缩机两种密封结构的比较

某公司两个生产装置循环氢压缩机均为螺杆压缩机，两台机组工况相似，但轴向密封机构有很大的不同。对两种不同的密封从结构原理性能上作了分析比较，以便为压缩机的检修提供参考。     

干气密封在天然气离心式压缩机上的应用

分析了原密封的失效原因,介绍了新密封的结构、原理和特性。新密封用于某厂10万吨甲醇装置的天然气压缩机上,改造后已运行37个月,没有工艺气泄漏,运行情况良好。     

离心式压缩机密封改造

介绍辽化循环氢离心式压缩机浮环密封改造为干气密封的情况，分析了改造后的节能效果。     

氢增压机进口干气密封国产化

从密封材料的选择、槽形的选择入手，对重整氢增压机的进口干气密封进行了国产化，并试验证实其满足使用要求。降低了关键设备备件成本。并通过减少隔离气的消耗来减小其运行成本。     

循环氢离心压缩机轴端密封改造

介绍了某石化用双端面干气密封替代浮环密封的原因及应用情况。改造后的运行效果表明该干气密封性能稳定、运行可靠、泄漏量小、能耗较低,经济效益显著。     

蜡油加氢循环机K602干气密封改造

分析蜡油加氢装置循环机K602浮环密封存在的问题,提出采用干气密封进行改造。介绍干气密封改造时,密封形式、密封气源和控制及联锁方案的选择以及转子的加工方法。蜡油加氢装置循环机K602干气密封的改造成功,提高了机组的安全性能和经济性能。     

干气密封在离心式压缩机上的应用

叙述了离心式压缩机浮环密封在使用过程中存在的问题，介绍了干气密封的工作原理，针对浮环密封比较分析了干气密封的应用效果。     

循环气压缩机浮环密封失效分析及改造

叙述了循环气压缩机浮环密封在使用过程中存在的问题,对其频繁失效的原因进行了分析,通过将原TBS型浮环密封改为干气密封,取得了良好的密封效果和经济效益。     

焦化气压机组干气密封的应用

介绍了焦化气压机组干气密封的工作原理,结构特点和控制参数等,通过积累该机组半年多的运行经验,指出日常操作重点和投用注意事项,以便更好地保证机组平稳运行.     

流体回流式机械密封技术研究进展

现阶段机械密封的操作条件更加苛刻和多样化。在一些高参数的密封工况下,传统的接触式机械密封磨损严重、寿命较短,已迭不到密封的基本要求。发展流体润滑的非接触式机械密封是保证设备长时间连续正常运转的迫切要求。流体回流式机械密封对普通机械密封端面进行简单改型,其结构简单、应用前景广阔,特别适合高压、高温、大尺寸等高参数工况。对具有回流特性的圆弧槽机械密封、螺旋槽上游泵送机械密封和水平槽机械密封的研究发展情况进行了综述。指出了开展深入研究水平槽机械密封的必要性。     

Influence analysis of secondary O-ring seals in dynamic behavior of spiral groove gas face seals

The current research on secondary O-ring seals used in mechanical seals has begun to focus on their dynamic properties. However, detailed analysis of the dynamic properties of O-ring seals in spiral groove gas face seals is lacking. In particular a transient study and a difference analysis of steady-state and transient performance are imperative. In this paper, a case study is performed to gauge the effect of secondary O-ring seals on the dynamic behavior (steady-state performance and transient performance) of face seals. A numerical finite element method (FEM) model is developed for the dynamic analysis of spiral groove gas face seals with a flexibly mounted stator in the axial and angular modes. The rotor tilt angle, static stator tilt angle and O-ring damping are selected to investigate the effect of O-ring seals on face seals during stable running operation. The results show that the angular factor can be ignored to save time in the simulation under small damping or undamped conditions. However, large O-ring damping has an enormous effect on the angular phase difference of mated rings, affecting the steady-state performance of face seals and largely increasing the possibility of face contact that reduces the service life of face seals. A pressure drop fluctuation is carried out to analyze the effect of O-ring seals on the transient performance of face seals. The results show that face seals could remain stable without support stiffness and O-ring damping during normal stable operation but may enter a large-leakage state when confronting instantaneous fluctuations. The oscillation-amplitude shortening effect of O-ring damping on the axial mode is much greater than that on the angular modes and O-ring damping prefers to cater for axial motion at the cost of angular motion. This research proposes a detailed dynamic-property study of O-ring seals in spiral groove gas face seals, to assist in the design of face seals.     

磁性流体水密封的实验研究

本文分析了磁性流体水密封的特殊问题，实验观察了不同磁性流体在水中的状态，根据疏水性质判定了油基磁性流体密封水的可行性。对两种密封装置进行了实验，高压密封装置的密封压差达到１．６ＭＰａ。     

Thermal performance of mechanical seals with textured side-wall

Experimental measurements and numerical simulations are presented to show the effectiveness of cooling of a mechanical seal's active surface by means of cylindrically shaped dimples engraved circumferentially on the outside diameter of the mating ring. The working fluid is propylene glycol solution (70% in water by volume) and the flush rate is 107 cm³/s. A commercially available CFD code (FLUENT) is employed to numerically confirm the experimental measurements, and the numerical and experimental results are in agreement. Results of this study demonstrate the heat augmentation effectiveness of surface texture techniques on the mechanical seals.     

机械端面密封技术研究现状及发展趋势

从摩擦、结构、材料和设计等几个方面阐述了机械密封的研究现状、存在问题和发展趋势。     

Evaluation of mechanical face seals operating with hydrocarbon mixtures

Methods are introduced for calculating thermophysical properties of the common volatile media, such as hydrocarbon mixtures in a petrochemical plant. Using a suitable equation of state for simulating thermodynamic equilibrium of the media and taking parallel face seals as geometrical models, a computer program for predicting seal performance of various phase states mechanical face seals (MFS) operating with the mixtures is presented. Based on theoretical analysis and experimental results, a criterion named fluid film pressure coefficient K_m for identifying phase states and phase states stability of MFS is put forward. An appropriate model for determining mean face temperature is set up and compared to the test results. It is shown that the predicted results are in excellent agreement with the test results. It is proved that the methods and program may be useful in practice. It is concluded that performance of MFS can be predicted only if thermophysical properties of a sealed medium could be expressed in suitable expressions.     

干气密封在裂解气压缩机上的应用

简述了101J裂解气压缩机上原机械密封存在的问题.根据该裂解气压缩机的特点,将原机械密封改造为新型的非接触式密封(即干气密封).详细阐述了带中间迷宫的串联式干气密封的工作原理、整个改造的实施情况以及密封的开车运行状况.结果证明,串联式干气密封在裂解气压缩机上的成功应用,从根本上解决了压缩机原密封的失效问题,保证了机组的安全、稳定、长期、满负荷运行.     

用于高(焦)炉煤气风机的非接触螺旋槽干气密封的设计与分析

论述了高(焦)炉煤气离心风机的转轴密封正被干运行非接触气体密封所取代的技术趋势。针对干式布袋除尘反吹煤气风机转速低、压力波动频繁的难点,设计了非接触螺旋槽干气密封,包括高刚度目标的螺旋槽型优化、干气密封零压力开启转速和角向动态失稳界限频率的分析、关键零件功能结构的选取以及干气密封支持系统的确定等。按照美国石油协会(API)617的规定及沈阳万得孚工业公司的标准对所设计的干气密封进行了性能检验和试验,并经历了工业现场令人满意的运行。     

单双列螺旋槽干气密封端面气膜刚度比较

双列螺旋槽干气密封通常被认为具有比单列螺旋槽干气密封更高的气膜刚度,因而更有利于干气密封的稳定运行,但是尚未见具体的理论分析或实验数据来验证这一结论。针对某一双列螺旋槽干气密封,采用窄槽理论,利用Mathcad 软件计算得到端面气膜压力分布和开启力,并得到开启力与膜厚的拟合曲线,以及气膜刚度与膜厚的函数曲线,并与单列螺旋槽进行对比。计算结果证实了双列螺旋槽干气密封具有比单列螺旋槽更高的气膜刚度,尤其是在开启力较小,气膜厚度较大的情况下,其主要原因是双列螺旋槽干气密封在同一开启力下,具有较小的平衡气膜厚度,即气膜的高刚度大部分是依靠减小的气膜厚度获得。双列螺旋槽干气密封端面开启力稍小,泄漏率稍大。     

喷油润滑型激光脸机械密封试验研究

针对航空发动机附件机匣传动轴端机械密封易提早失效的问题,提出在其端面开设激光脸槽型的改进方法,采用试验手段研究在喷油润滑条件下,激光脸机械密封的摩擦磨损特性、热特性及泄漏情况。自主设计可模拟喷油润滑工况的机械密封试验工装,定制可进行润滑油加热的集成型液压站作为辅助系统,分别进行变工况运转试验和长时稳态工况试验。结果表明：在变工况以及稳态工况运转条件下运转后动、静环端面均无明显磨损;在介质温度较为稳定的情况下,动环和轴套温度均能保持稳定;在整个试验过程中,机械密封均无泄漏发生,表明激光脸机械密封在喷油润滑工况下具备良好的热特性和密封效果。