金屬與金屬接觸式法蘭接頭在高溫重整裝置中的密封性能研究
[Abstract]:Bolt flange joint is widely used in the production equipment of chemical industry, oil refining and electric power industry. The leakage of bolt flange joint will cause environmental pollution and fire accidents. The heat preservation of high temperature flange joint can save a lot of energy, but heat insulation makes the temperature of high temperature flange joint which is easy to leak and will be further increased. If it can save energy, protect the environment and protect the safety of the flange joint, it is of great significance to heat the flange joint of the high temperature flange. Based on this idea, the high temperature flange joint of the aromatics reforming unit in the petrochemical enterprise is studied in order to ensure the safety and reliability of the seal. In order to cope with the heat preservation and energy saving transformation, in order to cope with the relaxation of the flange joint at high temperature, the metal and metal contact flexible graphite seal pads are used to replace the floating metal winding pads. The bolt load of the metal ring is used to compensate the relaxation effect of the flange joint, thus ensuring the stability of the load of the gasket seal ring and the reliability of the flange joint sealing. However, the research on the contact flange joint of metal and metal is relatively less, and there is no corresponding design method of flanges and bolt assembly tightening methods. Therefore, a more comprehensive study of the sealing reliability of the metal and metal contact flange joints is needed from the assembly, loading and creep conditions. The law of the temperature distribution of the flange joint is analyzed, and the thermal structure coupling analysis of the joint is prepared for a further step. In addition, the heat preservation and energy saving benefits of the high temperature flange joint are also analyzed. The analysis of the heat preservation and energy saving benefits of the high temperature flange joint is also analyzed. The results show that the energy saving efficiency of the flange joint after heat preservation can reach 94.64%. Only 12 to the high temperature and large flange can save 859 thousand and 300 yuan / year.2). The analytical calculation method for the sealing of metal and metal contact flange joint is established, and the sealing performance evaluation of flange joint based on the leakage rate criterion is established. The analytical calculation method is relatively simple and easy to use and is more comprehensive in consideration of load conditions. It is suitable for preloading, external load, internal pressure, thermal load and the combined working condition of these loads, and the thermal tight working condition.3). The behavior of metal and metal contact flange joints under pre tightening and high temperature conditions is studied by analytical method and finite element method. The flange deflection angle and the axial thermal expansion of the outer metal ring of the gasket are the main factors affecting the gasket load, that is, the sealing performance of the flange joint. When the metal is in contact with the metal, the load of the gasket seal ring decreases with the increase of the flange deflection angle or the axial thermal expansion of the outer metal ring of the gasket to reduce.4) to the contact flange joint of metal and metal. The creep relaxation is analyzed. The long-term creep of the flange joint at high temperature is another key factor affecting the sealing reliability of the metal and metal contact flange joints. The creep relaxation will break the metal contact with the metal, and then threaten the sealing reliability of the flange joint.5). "Metal and metal contact correction" idea to improve the bolt assembly efficiency and ensure assembly effect. Metal and metal contact gasket corresponds to the "cushioned sheet" state and "hard gasket" state before and after the metal and metal contact formation. In the bolt assembly process, a larger initial bolt pretightening force can be set to make the gasket from the first one. The property of the hard gasket will make the bolt pretightening force evenly distributed evenly and close to the target value in the subsequent tightening process. According to this idea, a suitable and highly assembled bolt tightening method is recommended for practical engineering installation reference. The research results of this paper are in aromatics heavy loading. It has been industrialized and has been tested for nearly 2 years and proved the reliability of the flange joint heat preservation transformation.
【學(xué)位授予單位】:華東理工大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:TE96
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