Finite Element Analysis And Structural Optimization At The Local Structure Of The Autoclave

The autoclave is a kind of special pressure vessel used to autoclave curing buildingmaterials such as aerated concrete, sand-lime brick, ash bricks, insulation asbestos sheets,high-strength gypsum. The main part of the autoclave device by the kettle body device,kettle cover device, swing device, hand reducer, safety interlocks, bearings, insulation layer,seals, pipeline valve instrument,subsidiary parts including drainage and electric controldevices. The autoclave equipment working under the complicated process, the internalpressure is alternating load, the kettle body prone to fatigue crack under in alternatingcorrosive environments and stress conditions.The autoclave equipment work morecomplicated process, its internal institutions are also more complex, the kettle body itselfcontains a lot of girth welds and transverse weld material trolley orbital welding in thebottom of the kettle body wall. Kettle body and its annexes in the process ofhigh-temperature and high-pressure work, not only withstand alternating pressure loadchanges, The autoclave was also bear at the bottom of the material car and the weight ofthe material, the multiple welds kettle body as well as the work process to produce thecorrosion is more likely to cause cracking of the kettle body.Now, the using autoclaves in the building materials industry, are generally occurscorrosion after used of more than one year. See from run the practice, generally, the usefullife is shorter then the design life, some of the autoclave has a20years design life ofscrapped after10years used, some of the autoclave has serious corrosion cracking, usingonly five or six years would have to be downgraded to use, not only caused great waste ofinvestment, but also seriously affect the production safety[1]. In recent years, with theincrease in the number of put into use autoclave, autoclave accident rate growth may havebeen seen by the incident of autoclave explosion, every accident causing huge economiclosses, and serious accidents and even cause casualties, a tremendous impact on individuals,units and the community, the finite element analysis of the autoclave, and with the crackcause to conduct an in-depth study to become an important issue.This article is study for autoclave a model RZ101203made by Henan Yuanda BoilerCo., Ltd. d. using ANSYS finite element analysis method, first on the autoclave local fatigue strength and fatigue life analysis and calculation.Then the autoclave at the localweld welding residual stress analysis and calculation of the two analytical results analysisand discussion，come to cause the autoclave local cracking of the real reason，on this basis,and propose solutions to optimize that type of autoclave equipment, to discuss thefeasibility of the scheme, using ANSYS finite element numerical simulation analysis andcalculation means to verify the optimization of the design optimization results. Whice canreduce the sensitivity to cracking of the reactor body, reduce the risk probability ofautoclave explosion occurred, and to ensure that the purpose of the life of the design life ofthe autoclave.