Evaluation Study Of Structure Itensity For Large Openning Pipeline Of Large Column

Pressure vessel is a common process equipment in almost all industries.Due to the requirements of the production process,it is often necessary to install inclined nozzle on the pressure vessel.An ellipsoidal hole should be opened on the surface of pressure vessel before installing the nozzle.With the continuous enlargement of the scale of the device,the volumn of the pressure vessel will also be expanded.Because the large opening of the pressure vessel studied in this paper is beyond the conventional design empirical formula,this problem can not be solved through the conventional design.After the pressure vessel surface opening,not only will cause the stress concentration in the area around the opening,but also will weaken the overall strength of the pressure vessel.This paper studied inclined nozzle with large opening under complicated external load Therefore,how to analyze and evaluate the nozzle structure of the tower to meet the safety and stability of the structure is the focus of design.In this paper,using the method of analysis design,through ANSYS software,the finite element model is established and the stress analysis evaluation is carried out to select the optimal tower structure and the best working condition.The specific research contents are as follows:1.The model of the tower nozzle is eastablished,and various reinforcement methods for openings are introduced of which the former Soviet standard is used to check the opening reinforcement calculation.2.The finite element model was simulated by using the finite element analysis software workbench.Whithin the elastic range,the follows are analyzed:(1)The ratio of nozzle wall thickness to cylinder wall thickness t/T;(2)Different angle between opening nozzle and pressure vessel axis;(3)Different distance between cylinder axis and vertical end axis of nozzle;(4)Stress distribution of pipeline under different external load.3.Through the exploration design module of workbench,the most suitable working condition and design structure for saving design materials are found out4.The optimal solution obtained from the optimization analysis is evaluated by stress linearization evaluation,and whether the evaluation results meet the design standards and whether reinforcement is needed will be studied.Comparing the results calculated by the former Soviet standard,finally,the most economical and reasonable nozzle structure and parameters are determined as follows:the wall thickness of nozzle is 30mm,the angle between nozzle and shell is 34° and the distance between cylinder axis and vertical end axis of nozzle is 8335mm.