Performanceon Research And Security Analysis Of The Plate-shell Heat Exchanger

Plate-shell heat exchanger has the advantages of compact structure and high heat-transfer efficiency,which is widely used in petrochemical,food and medical industries.Its operational efficiency,safety and reliability play an important role in the economic efficiency and sustainable development of these industries.Therefore,the efficiency,security and reliability must be considered for the design of Plate-shell heat exchanger.Plate-shell heat exchanger mainly includes head,shell and plate core.The mechanical properties of these components play a critical role in the overall heat exchanger efficiency,safety and reliability analysis process.In this paper,the mechanical properties of the head,cylinder and core of Plate-shell heat exchanger are studied by theoretical analysis,numerical simulation and experimental method.Finally,the safety evaluation of Plate-shell heat exchanger is carried out.The main work and innovative results are as follows:(1)The circular and radial stresses at different radii of the circular plate head are analyzed theoretically by using the theory of elastic plate small deflection.The results are compared with the experimental results.The results show that the circumferential stress is the largest at the center of the plate,and the radial stress at the edge is the biggest.The theoretical value and the experimental value are within20%.(2)The finite element method is adopted to simulate the equivalent stress and the ultimate bearing capacity of the critical point in the wall thickness direction of the cylinder,and the experimental study is carried out.The numerical results show that the total yield occurs at 68 MPa,which is consistent with the actual burst pressure of 62 MPa in the experiment with relative error of 4.4%.The head has the effect on the bearing capacity of the cylinder,and in the strengthened range.The ultimate load carrying capacity is independent of the length.The results show that the tested tube belongs to ductile blasting.(3)ANSYS Fluent is used to simulate the shell-core shell.The temperature field,the pressure field and the velocity field are analyzed at different flow rates.The temperature field and pressure field are coupled on the plate core by the FSI module.The fluid-solid coupling static mechanical analysis of plate core is conducted under different pressure difference.The results show that the plate-shell heat exchanger has the best heat transfer effect at the flow rate of 0.4m / s-0.6m / s;the maximum load-carrying pressure of the plate core is 10 MPa,which is in agreement with the experimental failure pressure of 10.8MPa with relative error of 7%,indicating that the numerical simulation of the calculation results have important meaning.(4)The failure data of the Plate-shell heat exchanger is statistically analyzed,and it is found that the failure probability of all the welding plate failure,sealing failure,flange failure and shell failure is descending.The FMEA “failure mode and effection analysis” method were used to qualitatively analyze the failure of the shell and tube heat exchanger,and the influence type analysis table and the related preventive measures were obtained.