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Plate heat exchanger design steps
Dec 07, 2017

There are various forms of plate heat exchangers, each of which has its own characteristics. Different use conditions and heat transfer purposes have specific requirements for the structure of the heat exchanger. The selection of heat exchanger is to select a relatively reasonable form of heat exchanger according to the structural characteristics, conditions of use, investment and operation cost. To choose the form of heat exchanger reasonably, we must be familiar with the structural characteristics and working characteristics of various heat exchangers. According to the specific conditions, we must make the best choice when calculating and comparing various schemes when necessary.

Various factors such as material, medium, pressure, temperature, temperature, temperature difference, pressure drop, scaling, maintenance and cleaning method should be considered in the selection of heat exchangers. Among the many factors, the first thing to consider is the safety factor.  This requires that the heat exchanger is strong enough, the structure is reliable, and the material is compatible with the medium. Secondly, it is necessary to ensure that the heat exchanger can fulfill the heat transfer conditions specified by the process, which requires that the heat exchanger has enough heat transfer area. On the other hand, the structure must ensure that the medium has favorable heat transfer state. In addition to meet the economic requirements, this requires that heat exchangers are easy to manufacture, install and maintain, and have good operating performance and lower operating costs. Comparison of selected characteristics of common plate heat exchanger, as shown in table 1-2 usually is not temperature, method of shell fouling is not serious or shell can be used for cleaning and chemical cleaning, can be used in fixed tube heat exchanger; temperature difference can be used when the heat exchangers, U tube heat exchanger, the stuffing box type heat exchanger and the sliding plate heat exchanger; if required for Hangzhou mechanical cleaning of the shell, the structure is adopted to control can be extracted; high temperature and high pressure heat exchanger usually adopts U tube heat exchanger; shell medium is flammable, explosive and toxic or volatile medium, and the use of pressure, when the temperature is high, should not be used for stuffing type heat exchanger; when mixing tube and shell medium medium will produce serious consequences, should use the double tube sheet exchanger structure.

The design of the fourth section plate heat exchanger, the design of the plate heat exchanger mainly includes five parts, including the structural design, the thermal design calculation, the fluid resistance design calculation and the intensity design calculation and drawing. In the actual design, each part of the content is not carried out in isolation, but intersecting and constantly adjusting in the calculation. But each part of the design content is relatively independent, can be divided into part of the design.

First, structural design and structural design are mainly based on the design task to select the basic form of heat exchangers. Then the initial size of the main structure, thermodynamic calculation and fluid resistance calculation, and according to the calculation of structure adjustment, until meet the design requirements.

The calculation of thermal design calculation, two thermal design is mainly to calculate the heat transfer area required for heat transfer according to the requirements, to adjust the structure size according to the calculating results, the heat transfer area of the heat transfer area and heat transfer structure design calculation and calculation are consistent, the fluid resistance design in a certain margin of three, the main design calculation of fluid resistance according to the structure, fluid flow requirements to calculate the pressure drop, the pressure drop within the scope of permission. Usually, the thermal calculation is continued after the result of the drag reduction is confirmed within the permit range.

Four, strength, stiffness, stability design strength, stiffness and stability of the design is in the structural design, thermodynamic calculation, calculation of fluid resistance all after the completion of the main task is to determine the standard design of the heat exchanger components of the strength stiffness and stability of size, size for size, construction drawing preparation.

Five. There are two tasks for drawing and drawing. Before the completion of the design and calculation, we draw the preliminary structural design and stage structure design for design calculation. After the design calculation is completed, we draw the qualified heat exchanger construction drawing according to the relevant standards and specifications.


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