Stress Analysis And Intensity Evaluation Of 112E/G Heat Exchanger

Based on the structure of 112 E / G heat exchanger (fixed tubeplate), the tube-plate, the shell, the cone and cylinder of inlet tube-box, the cylinder of outlet tube-box, the tubes, the insulation layer made of the composite silicate, the heat-resistant layer made of the castable ceramic fiber were as the research object. The axisymmetric model of the steady-state temperature field analysis was established. On the design temperature conditions and operation temperature conditions, the temperature analysis results of the whole of heat exchanger made up of the tube-plates, the cylinder, the tubes and tube-boxes supply the stress analysis with assured temperature loads. According to the structural characteristics of heat exchangers and load, 1/2 heat exchanger including the inlet and outlet tube-boxes, tube-plates, tubes, buttresses, nozzle zones, flanges, and other major components was chose for the study, a three-dimensional nonlinear finite element objective model was conducted by taking the bolted the box flanges and shell-cylinder flanges into account. The stress analysis and intensity evaluation under different load cases were completed by the ANSYS-software. For the lake of the intensity of the nozzles evaluated with the stress classification method under water pressure test in the process of stress analysis and intensity evaluation, the elasto-plastic finite element structural analysis of the heat exchanger nozzles was conducted. According to plastic analysis, the ultimate load is 29 MPa. The design load is 18.78 MPa. It meets the intensity evaluate criterion, which is"The design load does not surpass 2/3 times of ultimate load". In accordance with this conclusion, the water pressure test of the 112E/G heat exchanger has been done and the 112E/G heat exchanger has been put into operation safely. For the further analysis of the results of actual vented tube-plate and equivalent solid tube-plate was researched. The border stress value of hole in the tube-plate is 442.59 Mpa and it showed that accumulation of stress is obvious. It provides a reference for the tube-plate intensity evaluation.