Study On High Temperature Metal Bellows Expansion Joint

Metal bellows expansion joints are mostly used to absorb the axial,transverse and angular displacements of equipment or pipelines caused by pressure or temperature changes.They can also be used for shock absorption and sealing of high frequency equipment and pipelines because of their flexible characteristics.As an upgraded product of common metal bellows expansion joints,high temperature and high pressure metal bellows expansion joints are characterized by high design pressure and high service temperature.The design,material selection,manufacture,welding process and quality must meet the requirements of standards and field environment.The design and manufacture of typical high temperature expansion joints are studied in this paper.The development status of expansion joint industry is analyzed,and the classification and selection of metal bellows expansion joints are studied.The design criteria and methods of high temperature expansion joints are studied,and the calculation and verification of design parameters of high temperature bellows expansion joints are analyzed.Aiming at the parameters of two high temperature bellows expansion joints between the dome connecting tube combustor and mixing chamber of No.4 blast furnace in Panzhihua Iron and Steel Works,the design calculation is carried out by using national standard GB/T12777 and referring to American EJMA standard.Pro-E software is used for 3D aided design,and professional software is verified.The production process,key quality assurance measures,test items and methods of expansion joint of high temperature bellows are analyzed and studied,and the effective and reliable production process is optimized and perfected.Through product performance test and practical application,the design calculation and control process are verified.Through the research on the design and manufacture of typical high temperature bellows expansion joints in metallurgical enterprises,this paper designs and produces high temperature expansion joints products that meet the user's requirements,guarantees the successful completion of maintenance of No.4 blast furnace in Pangang Iron and Steel Works,forms stable production capacity,and establishes solid bellows expansion joints for the follow-up design and manufacture of this kind of high temperature bellows.Theory and application basis.At the same time,it also creates new economic growth points for enterprises and opens up new market space.