Heat Treatment Of A2000m~3Spherical Storage Tank

2000m3spherical tank is a large, complex welding shell structure. Due to large spherical tank volume and diameter, it cannot transport as a whole. So we must suppress the ball, process and manufacture backbone, such as compound over parts in factory, and then transport to the field conducting assembly welding. Spherical tank installation is the key process of building a spherical tank. However, welding seam welding residual stress after completion of large spherical tank, some can achieve material yield limit and has great harm or hidden danger to the use of spherical tank safely. So based on the analysis of the formation reason of welding residual stress and the impact of bad stress on spherical tank, we induce the method for eliminating stress2000m3spherical tank is inductive research, and improvement of the heat treatment after welding of spherical tank welding joint scheme has important application value.The main content of this paper includes five chapters. The first chapter introduces the research purpose and significance, the domestic and international current situation and main research contents in this paper. The second chapter is about spherical tank welding residual stress and elimination methods, mainly introduces the welding residual stress formation reason, the impact of adverse stress of spherical tank and the method of eliminating residual stress. Third chapter has carried on the thermal calculation of2000m3spherical tank, analysised the heat income and expenditure according to the energy conservation during heat treatment, calculated the amount of heat of0#light diesel oil combustion, the heat absorption and heat insulating materials, the amount of air insulation material surface heat flux, flue gas leaving the tank away heat generated and fuel amount and the actual, the cycle heat balance sheet for heat treatment. The fourth chapter designs the2000m3spherical tank thermal processing system, and studies the process of heat treatment practice. The fifth chapter gives the evaluation of the effect and synergism of2000m3spherical tank post weld heat treatment. The design and research of this paper provides a method and means to eliminate2000m3spherical tank welding stress.