Reserch On The Nozzle Design And Production Technology Of Glass-Lined Pressure Vessel Based On Failure Modes

Glass-lined pressure vessel has many advantages, such as corrosion-resistant, insulation, wear-resistant surface finish, and these advantages attracted widespread attention. With the development of materials and preparation process, the life of glass-lined equipment has increased substantially, making it used widely in chemical industry production. However, in actual use, when nozzle explosion porcelain failures have occurred again and again, it has become an important barrier to the high reliability, long life glass-lined pressure vessel. Therefore, the relevant theoretical and experimental studies on Glass-lined pressure vessel’s nozzle is necessary. This study was conducted for the failure case studies, obtained an urgent problem; Numerical simulation and experimental study of the nozzle area, get the relationship between the main geometric parameters of the nozzle area and performance of the enamel, and then further explore failure mechanism of the nozzle area porcelain.Firstly, by research production enterprises of glass-lined pressure vessels and statistic the main form of glass-lined pressure vessel failures, found that both the glass-lined pressure vessel manufacturing porcelain burst and stress injury problem occurred in using, most of these damage are root of nozzle area.Secondly, use the DEFORM-3D plastic forming finite element simulation software to simulate the nozzle manufacturing processes. Simulate punching speed, temperature, and other major shaping parameters influence of process on the thermoforming process. Obtain glass-lined pressure vessel manufacturing optimization parameters, provide a reference for the experiment. The simulation results show that the molding temperature, stamping speed have further optimized space.Finally, based on simulation, nozzle hot forming experimental research carried out to verify the simulation results. Experimental study on nozzle of different sizes to explore the effects of structural size on enameling. Results show that the R value have significant effect on the performance of the enamel. When 38mm≤d0≤100mm,3mm≤R≤10mm, the enamel performance enhanced very fast. When the R value is less than 3mm, nozzle’s district have poor enamel performance and it is difficult to meet the industrial demand. When the R value is increased to 10mm or more, nozzle’s district porcelain layer performance is no longer significantly enhanced.Through research, software simulation and a large number of experiments, explored the major structural dimension parameters affect on porcelain layer performance. Then suggest some improvements from design and manufacturing sectors, to enhance the use of glass-lined pressure vessel reliability and life, so it has a certain theoretical and practical significance.