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Analysis of Heat Exchanger Process Design for Heat Exchanger
Sep 27, 2018

Heat exchanger manufacturers say that heat exchangers play an important role in the petrochemical industry. In order to meet the requirements of use, the conventional calculation of the heat exchanger is involved in the design. At the same time, the stress analysis and strength failure analysis of the tube sheet are required, and the stress analysis of the tube sheet is performed by using the finite element. We know that heat exchangers are the key to complete the process of media cooling or heating during the process.


For the time being, in the chemical industry, heat exchanger equipment accounts for one-tenth to one-fifth of the total process equipment investment, and may account for 35% to 40% in the refining industry. Heat exchange equipment has a wide range of applications in the petrochemical, power, metallurgical, food and other industrial sectors, of which shell-and-tube heat exchangers are the most widely used heat transfer equipment in industrial production. Heat exchanger manufacturers, we can choose different heat exchanger equipment in different applications.


The heat exchanger manufacturer explained that the current heat exchanger equipment can be mainly divided into two categories, one is a shell-and-tube heat exchanger, which is characterized by a tube bundle in a circular outer casing. A medium flows through a passage in a heat exchange tube and a portion thereof. It can be further divided into: floating head heat exchanger, U-tube heat exchanger, fixed tube plate heat exchanger and so on. The other type belongs to the plate heat exchanger, which is composed of a thin plate which is pressed into various shapes to form a heat transfer surface, and the cold and hot media respectively flow in the adjacent two plates. Common plate heat exchangers include flat plate heat exchangers, umbrella plate heat exchangers, spiral plate heat exchangers and plate-and-shell heat exchangers.


According to the actual application, the heat transfer efficiency of the plate heat exchanger is high, but there are disadvantages such as low strength and poor sealing performance, so the application is limited. Heat exchanger manufacturers believe that the shell-and-tube heat exchanger is widely used in the petroleum and chemical industries, and it has been used as a traditional heat exchanger.


Heat exchanger manufacturers, in order to ensure the normal operation of the heat exchange equipment within the design life, it is necessary to carry out strength analysis and calculation. The heat exchanger is essentially a pressure vessel, and its strength must meet the requirements of the conventional pressure vessel design specification; such as the minimum thickness under the internal and external pressure of the main body strength component, the maximum allowable working pressure, the opening reinforcement, the stress check, etc.; The combination of external loads ensures reliability.


In the process of analyzing the stress of the heat exchanger tube sheet, it is mainly combined with five aspects for analysis. The heat exchanger manufacturer explained that it mainly includes: 1. The pressure difference caused by the tube and shell pressure; 2. The axial and hoop stress caused by the pressure; 3. The asynchronous thermal expansion of the heat exchange tube and the tube sheet; 4. The thermal expansion stress caused by the temperature difference between the tube sheet and the tube/shell shell; 5. The bolt load of the equipment flange to the tube sheet.

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