High-efficiency plate heat exchangers in the petrochemical industry

April 17, 2023

High-efficiency plate heat exchangers are realized by using different commutator segments and different assembly methods, which can be divided into single-flow, multi-flow and mixed flow, which should be selected according to process requirements. Generally, for media with a temperature difference greater than 1.8 times the logarithmic average temperature difference, multiple processes should be used. The adaptive value of the flow velocity between plates is 0.3~0.5m/s. When the flow rate is too low, double or multiple processes should be used.

High-efficiency plate heat exchangers are used in the heat exchange of liquids in the pharmaceutical, food, chemical and other industries, and in some applications for pasteurization.

In the petrochemical industry, there are many types and quantities of heat exchangers, and they also have very high requirements for pressure and temperature. High-efficiency plate heat exchangers are better able to handle higher pressures and higher temperatures. Specifically, the Welded Plate Heat Exchanger has strong convenience, small size, light weight, good heat transfer performance, and low price. Therefore, it has been well applied in the production process of offshore oil. It can cool mechanical lubricating oil and fresh water, and can cool related intermediate products in oil fields, and can also be used to heat crude oil. The application of high-efficiency plate heat exchangers in the petrochemical industry also has certain bottleneck problems, that is, it is difficult to accurately design and calculate the process flow. In the production practice of the petrochemical industry, often due to process design Unreasonable gains lead to huge economic losses.

In order to solve this problem, the calculation and analysis of the resistance of the Plate Heat Exchanger used for cooling in the practical application of the petrochemical industry can be carried out. According to the characteristics of the heat exchanger and the principle of heat conduction, the liquid phase on the wall surface increases linearly along the flow channel, and the outflow is simulated. The relationship formula among channel length, real mass gas fraction and volume gas fraction is close to the actual data. The cooling process in the petrochemical industry has partial condensation, which will form a liquid film on the heat exchange surface. Therefore, when a compact heat exchanger such as a plate-fin type can be selected, and at the same time to achieve a reasonable and economical heat exchanger, it must be Considering the adjustment of the heat exchanger from the perspective of structural parameters, it is not perfect to only consider the heat transfer area and margin.

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