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Determination skills of plate process combination of removable plate heat exchanger

2021-11-26 11:22:30

Due to the special effect of the corrugated surface of the plate, the fluid flows along the narrow and curved channel, and the direction of its velocity changes continuously, resulting in the strong end movement of the fluid at a small velocity, which speeds up the destruction of the fluid boundary layer, strengthens the heat transfer process and effectively improves the heat transfer capacity. The utility model has the advantages of compact structure, low metal consumption, large operation flexibility, small heat loss, convenient installation, inspection, disassembly and washing, strong corrosion resistance, long service life and so on. Each plate of each specification has at least two plate types. The heat mixing technology can integrate the heat transfer and pressure drop of the heat exchanger to make it operate at a good working point. Internal bypass, double channel technology and unequal flow cross-sectional area assembly provide a solution for the working conditions with large difference in medium flow on both sides. Ard plate heat exchanger has several major series and more than 100 plate types, such as AB series, am series, Al series, AP Series and as series. Various models have deep ripple, shallow ripple, large angle, small angle, etc., which can fully meet the needs of different users. Special working conditions can be specially designed and manufactured according to the needs of users.

Flow refers to a group of parallel flow channels in the same flow direction of a medium in the plate of the heat exchanger, and the flow channel refers to the medium flow channel composed of two adjacent plates in the plate heat exchanger. Generally, several flow channels are connected in parallel or series to form different combinations of cold and hot medium channels.

The process of plate heat exchanger is composed of many plates assembled according to certain process and technical work requirements of the demander. A mesh channel is formed between the plates, and four corner holes form a distribution pipe and a confluence pipe. The sealing gasket seals the cold and hot media in the heat exchanger, and reasonably separates the cold and hot media without mixing. In the channel, the cold and hot fluid flows at intervals, either countercurrent or downstream. During the flow process, the cold and hot fluid exchanges heat through the plate wall. There are many process combination forms of plate heat exchanger, which are realized by different reversing plates and different assemblies. The process combination forms can be divided into single process, multi process, vapor-liquid exchange process and mixed process.

The process combination form shall be determined according to the calculation of heat exchange and fluid resistance and meeting the requirements of process conditions. Try to make the convection heat transfer coefficient in the cold and hot water channels equal or close to each other, so as to obtain good heat transfer effect. Because when the convective heat transfer coefficient on both sides of the heat transfer surface is equal or close, the heat transfer coefficient obtains a larger value. Although the flow velocity between plates of plate heat exchanger is different, the average flow velocity is still used in the calculation of heat exchange and fluid resistance. Since the connecting pipes of "U" single process are fixed on the compression plate, it is convenient to disassemble and assemble.

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