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Simulation and Analysis on the Performance of Pre-stressed Heat Exchanger with Segmental Baffles

Author: PangLingHui
Tutor: GuoChongZhi
School: South China University of Technology
Course: Safety Technology and Engineering
Keywords: Heat exchanger with segmental baffles Pre-stress Numerical simulation Operated mode Baffling component
CLC: TQ051.5
Type: Master's thesis
Year: 2010
Downloads: 54
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Abstract


The shell-and-tube heat exchanger is widely used because of its simple structure, mature designing and processing craft, large handling capacity, strong compatibility as well as safty and reliability and so on. Heat exchanger with segmental baffles becomes the most universal one in traditional hell-and-tube heat exchangers because of its merit of simple structure, high-heat and high-pressure valve, easy to clean, maintain and low cost.The pre-stressed technology has good prospect in development and application for it may greatly reduce the thermal stress of fixed tube-sheet exchanger. There is much research on heat exchanger at home and aboard, but research on pre-stressed heat exchanger is limited. The method how to apply pre-stress to heat exchanger is different. Under the instruction of patent <The Design and Manufacture Method on Shell and Tube Pre-Stressed Heat Exchanger>, the rod-baffle pre-stressed heat exchanger has had good research, and which has been proven the technical feasibility through simulation and experiment. Deeply study is conducted on pre-stressed heat exchanger with segmental baffles in this paper. The prime task includes several aspects as follows:1. Creat 3D finite element model on the base of rationally simplifying actual structure.2. Transform the output data from CFD model to finite element model as the load boundary condition, thus completing temperature analysis on structural model.3. Use the indirect coupled method to simulate the pre-stressed analysis by applying pre-deformation; seek the best pre-deformation by represent variety of pre-deformation.4. Change the tube-side temperature while the other condition remain the same, analyze the performance of heat exchanger under different tube-side temperature and three kind of operating modes:only receive the temperature load, simultaneous action of temperature load and pre-deformation load, only receive the pre-deformation load. Discuss the influence of pre-stressed technology on different tube-side temperature.5. Comparing the two kinds of pre-stressed heat exchanger between the heat exchanger with segmental baffles and the rodbaffle heat exchanger, three aspects is put forward: the thermal field, the thermal-construct field, the pre-stressed field. Analyze the influence of different baffling component, and the differences of the most superior structure.The analytical technology and method of pre-stressed heat exchanger with segmental baffles in this paper have direction and lessoning affect for other pre-stressed simulation such as other different baffling components, multipass tubular heater, and is worth to be further researched and widely applied. Through the research in this paper, not only rich the existing pre-stressed theory and technology, lay the foundation of wide-spread use of pre-stressed heat exchanger, but also provide a kind of simple, economic, reliable method for enterprises which use heat exchanger with segmental baffles at present to enhance its security.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical machinery and apparatus, equipment > Chemical process machinery and equipment > Heating, cooling machinery
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