加氢进料泵机械密封研究

发布时间：2019-05-09 08:26

【摘要】：机械密封是流体机械设备中的关键部件。随着石化大型设备的不断涌现,其设备的参数不断提高,机械密封所面临的应用工况也越来越苛刻。尤其重载条件下的高压机械密封经常出现局部过热、磨损过大、寿命过短等现象,这样就很难满足于石油化工过程中的连续运转要求,因此需要一套科学系统的理论分析工具。本文基于有限元理论方法,综合国内外相关研究成果,建立力—热载荷耦合分析模型,对机械密封进行理论分析阐述。以工程应用的加氢进料泵机械密封为切入点,以案例分析的方式,分析了机械密封在各场中的变形,研究了摩擦副端面的变形协调技术。并且将其应用于加氢进料泵机械密封研究分析上,对其结构做了优化调整,从而解决实际工况问题。在第二章中对机械密封的结构进行了讲解,对基本理论进行了阐述和机械密封相关的参数研究都做了基本的描述；在第三章中对机械密封的静态力载荷结构分析,通过对机械密封整体分析,获得摩擦副在力载荷下的一些变形原则,密封端面在受压力时的变形时,形成发散的锥度。进而分析其影响因素,掌握调整方法,从而进行调整,降低其变形量及应力；第四章是对机械密封进行了热载荷分析,同样进行了获得了摩擦副在温度载荷影响下的变形原则,为后续做耦合分析提供给了理论依据；在力载荷—热载荷耦合分析时,将机械密封作为整体进行直接耦合,获得其最终变形原则；第五章是对机械密封摩擦端面的受力进行了阐述,这样就较全面的完成了机械密封的摩擦副分析；通过将密封端面间隙分类进行判断其适用性,再根据变形协调技术进行优化调整,获得极佳的机械密封摩擦副结构。在考虑整套机械密封装置的过程中,不仅仅要考虑摩擦副的性能,本文进一步考虑了其余相关金属部件的影响因素。对相关金属部件应用有限元的方法进行分析计算,获得应变与应力的数据,进而应用相关原则进行判定。从材料的角度阐述了如何进行调整优化,用以满足机械密封整体性能要求。本文从机械密封装置的整体出发,不仅仅考虑摩擦副,还对其它影响因素进行考虑,不孤立任何一个影响因素,由于机械密封在正常工况下运转时,表征了一个系统的运行状态。本文研究的结果为机械密封的装置设计、制造、使用和维修提供理论依据。
[Abstract]:Mechanical seal is the key component of fluid machinery equipment. With the continuous emergence of large petrochemical equipment, the parameters of its equipment continue to improve, and the application conditions of mechanical seal are becoming more and more stringent. In particular, high pressure mechanical seals under heavy load conditions often appear some phenomena such as local overheating, excessive wear, and too short life, so it is difficult to meet the requirements of continuous operation in petrochemical process. Therefore, a set of scientific and systematic theoretical analysis tools are needed. In this paper, based on the finite element method and the related research results at home and abroad, the coupling analysis model of force-thermal load is established, and the mechanical seal is analyzed and expounded in theory. Based on the mechanical seal of hydrogen feed pump used in engineering, the deformation of mechanical seal in each field is analyzed in the way of case analysis, and the deformation coordination technology of friction pair face is studied. It is applied to the research and analysis of mechanical seal of hydrogenation feed pump, and its structure is optimized to solve the problem of actual working condition. In the second chapter, the structure of the mechanical seal is explained, and the basic theory and the research on the parameters of the mechanical seal are described. In the third chapter, the static force load structure of mechanical seal is analyzed. By analyzing the whole mechanical seal, some deformation principles of friction pair under the force load are obtained. When the seal face is deformed under pressure, the divergent taper is formed. Then the influencing factors are analyzed and the adjustment methods are mastered so as to adjust and reduce the deformation and stress. In the fourth chapter, the thermal load analysis of mechanical seal is carried out, and the deformation principle of friction pair under the influence of temperature load is obtained, which provides the theoretical basis for the subsequent coupling analysis. In the coupling analysis of force load and thermal load, the mechanical seal is directly coupled as a whole, and its final deformation principle is obtained. The fifth chapter is to explain the force on the friction end face of the mechanical seal, so as to complete the analysis of the friction pair of the mechanical seal in an all-round way. Based on the classification of seal face clearance and the optimal adjustment according to deformation coordination technology, the excellent structure of mechanical seal friction pair is obtained. In the process of considering the whole mechanical sealing device, not only the performance of friction pairs should be considered, but also the influence factors of other related metal parts are further considered in this paper. The finite element method is used to analyze and calculate the related metal parts, and the data of strain and stress are obtained, and then the relevant principles are applied to judge the related metal parts. From the point of view of material, this paper expounds how to adjust and optimize to meet the overall performance requirements of mechanical seal. In this paper, starting from the whole of the mechanical seal device, not only considering friction pairs, but also other influencing factors, not isolated any of the influencing factors, because the mechanical seal is operating under normal operating conditions, The operating state of a system is characterized. The results of this paper provide a theoretical basis for the design, manufacture, use and maintenance of mechanical seal devices.
【学位授予单位】：大连工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH136

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