Calculation Method Of Tube Plate In Heat Exchanger With Combined Pipe And Research Of Program Implementation

Shell-and-tube heat exchanger has been widely used in petrochemical,electrix power, light industry and pharmaceutical.Tube plate is a crucial component of heat exchanger.Reasonable designs of heat exchangers have been proposed for improving transfer effect,safety,reliability and prolonging the service life.This paper has been presented a composite heat exchanger with straight tube and corrugated tube,using shell theory to establish mechanical model,proposing calculation method based on this type of structure.Solving flexibility matrix and load matrix,establishing linear equations with15unknown numbers by equilibrium equation and deformation compatibility conditions.Each component of edge forces,as boundary conditions,has been used for solving Bessel equation,Tomson function is used to illustrate the basic solution of tube plate deflection, gaining stress and deformation in any position. It has been provided a precise calculation for the structure.Based on the new structure,using C++and object-oriented programming theory,developing a visualization aided calculation software on the grounds of Microsoft Foundation Class,in the Visual Studio complie environment.In order to verify the correctness and reliability of calculation method and programming,two different methods,the domestic process equipment strength software package SW6and ANSYS engineering simulation software, are compared with the above method. Studying the stress distribution of tube plate and heat transfer tube on different combination loads.For the sake of strength and stiffness requirements, finishing optimal design of a particular composite heat exchanger determining the optimum tube structure to achieve minimum safety thickness of tube plate. Program respectively contrast with two situations: ordinary heat exchanger with expansion joint and whole corrugated tube heat exchanger,tube plate thickness of composite heat exchanger is greatly reduced,which confirms the rationality and superiority of the new structure.The results showed that:composite heat exchanger bearing capacity is greater than corrugated tube heat exchanger,tube plate thickness is far smaller than either ordinary heat exchanger with expansion joint or corrugated tube heat exchanger.Composite heat exchanger can be used to solve deformation caused by lager temperature difference,high stress of tube plate edges and surrounding tubes plus expansion joint in heat exchanger under high-pressure,reaching the thickness reduction of tube plate and significant decline in manufacturing costs,overcoming the weakness of the overall instability of corrugated tube bundle under tube pressure.