Characteristics and features of plate heat exchangers
Release time:
2021-04-14 17:16
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A plate heat exchanger is a high-efficiency heat exchanger formed by stacking a series of metal plates with a certain corrugated shape. Thin rectangular channels are formed between the plates for heat exchange. Plate heat exchangers are ideal equipment for liquid-liquid and liquid-vapor heat exchange. There are two main types: frame type (dismountable) and brazed type. The plate types mainly include chevron corrugated plates, horizontal flat corrugated plates, and dimpled plates.
The characteristics of plate heat exchangers have always been a focus of attention. They are characterized by high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, wide application, and long service life. They are widely used in metallurgy, mining, petroleum, chemical industry, power, medicine, food, chemical fiber, papermaking, light textile, shipbuilding, heating and other sectors. They can be used for heating, cooling, evaporation, condensation, sterilization and disinfection, waste heat recovery, and various other situations. Under the same pressure drop, its heat transfer coefficient is 3-5 times higher than that of a tube heat exchanger, the footprint is one-third that of a tube heat exchanger, and the heat recovery rate can be as high as 90% or more.
Features of Plate Heat Exchangers
1. The heat transfer area of a plate heat exchanger basically does not increase, but the heat transfer area or process combination can be changed. Adding or removing a few plates can increase or decrease the heat transfer area; changing the plate arrangement or replacing a few plates can create the corresponding process combination to adapt to new heat exchange conditions.
2. Plate heat exchangers have a large average temperature difference for water and a small terminal temperature difference. The water flows parallel to the heat transfer surface without bypass flow. In shell and tube heat exchangers, the two fluids flow in the tube side and shell side respectively, which is generally cross-flow. The logarithmic mean temperature difference correction factor is small, while plate heat exchangers are mostly parallel flow or countercurrent flow, and their correction factors differ by less than one.
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