Finite Element Intensity Analysis Of The KLQ-type Heat Exchanger With Non-standard Shell Flange

Tube-and-Shell heat exchanger is the equipment to exchange heat. It is widely used in chemical,oil,electricity,light industry,metallurgy,nuclear energy,ship building, aviation, heating and other industial.Especially in the petroleum refining and chemical processing equipment,it takes an extremely important position. With the continuous expansion of production scale and modern production technology,heat exchanger technology must meet special circumstances and conditions of the various demands.In recent years, according to the variety requirements of technology, Tube-and-Shell heat exchanger with non-standard shell flange often appears in engineering, predecessors have very detailed study on the tube plate, but the research of the shell flange aslo used for flange is few. GB150-1998《Steel Pressure Vessels》and ASME have the relevant rules on flat in the intensity Checking.But further research on the Circle Plates with openings should be carried out. The Tube-and-Shell heat exchanger related to this thesis is Non-standard designed, so it can't to use the normal methods. To this end, stress analysis and structure research on the KLQ-type heat exchanger with non-standard shell flange by the modern number calculation method, Focus on the analysis of the stress intensity under different conditions. The main research contents and conclusion is as follows.(1) According to the structural differences of the model,simplifyied the model. A reasonable of limited element model of the non-standard shell flange is built by ansys of General finite element software, the result of temperature field analysis reflect the temperature distribution on the the shell flange model.(2) Analysis the thermal stress under the temperature load. Thermal stress causing by temperature load is an inconvenient factor, for the three kinds of the materials have differences in its coefficient of thermal expansion, stress intensity have a sudden change in its connected place. In the safety assessment, temperature load condition is safe.(3) Analysis the stress on the conditions of the shell-side pressure; analysis the stress on the conbined condition of the shell-side pressure and temperature.According to JB4732-95《Steel Pressure Vessels - analysis and design standards》, Make safety evaluation to the shell plate of heat exchanger.(4)According to the analysis of the three conditions as follows,only by the shell-side pressure,only by the temperature load,by the shell-side pressure and temperature load, assess the impact by equipment mechanical load and thermal stress generated by temperature load.(5)Through the analysis we know that the original design is failure in intensity checking under the shell-side pressure load. The thesis improved the design by increasing the closure plate thickness and enlarging the opening round, the intensity checking is qualified at last.