A plate cooler is a modern high-efficiency heat exchanger loaded with a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between the various plates, and heat is exchanged through the half plates. Compared with the conventional shell and tube heat exchanger, its heat transfer coefficient is much higher under the same flow resistance and pump power consumption, and it has a tendency to replace the shell and tube heat exchanger within the applicable range. The types of plate coolers mainly include frame type (removable type) and brazing type. Two major components of plate cooler The plate cooler is mainly composed of frame and plate. The plates are made of various materials and are pressed into corrugations of various shapes with various forms of abrasive tools, and corner holes are opened on the four corners of the plate for the flow channel of the medium, the plate The periphery and corner holes are sealed with rubber gaskets. The frame is composed of fixed pressing plates, movable pressing plates, upper and lower guide rods and clamping bolts. The clamping plate and the movable clamping plate are then clamped with clamping bolts. Thin rectangular channels are formed between the various plates, and heat is exchanged through the half plates. Compared with the conventional shell and tube cooler, its heat transfer coefficient is much higher under the same flow resistance and pump power consumption, and it has a tendency to replace the tube cooler within the applicable range. Features of plate coolers 1. High heat transfer coefficient Because different corrugated plates are inverted to each other, a complex flow channel is formed, so that the fluid flows in a rotating three-dimensional flow in the flow channel between the corrugated plates, which can be generated at a lower Reynolds number (generally Re=50~200) Turbulent flow, so the heat transfer coefficient is high, which is generally considered to be 3 to 5 times that of the shell-and-tube type. 2. The logarithmic average temperature difference is large, and the end temperature difference is small. In the shell-and-tube heat exchanger, the two fluids flow in the tube side and the shell side respectively. Generally, the flow is cross-flow, and the logarithmic average temperature difference correction coefficient is small, while the plate type Most of the heat exchangers are co-current or counter-current flow modes, and the correction coefficient is usually around 0.95. In addition, the flow of cold and hot fluids in the plate heat exchanger is parallel to the heat exchange surface and has no side flow, thus making the plate heat exchange The temperature difference at the end of the heat exchanger is small, and the heat exchange for water can be lower than 1 °C, while the shell-and-tube heat exchanger is generally 5 °C. 3. The plate heat exchanger has a small footprint and a compact structure, and the heat exchange area per unit volume is 2 to 5 times that of the shell and tube type. For heat exchange, the plate heat exchanger covers an area of ​​about 1/5~1/10 of that of the shell and tube heat exchanger. 4. It is easy to change the heat exchange area or process combination. As long as a few plates are added or reduced, the purpose of increasing or reducing the heat exchange area can be achieved; by changing the plate arrangement or replacing a few plates, the required process combination can be achieved. , to adapt to the new heat exchange conditions, and the heat transfer area of ​​the shell and tube heat exchanger is almost impossible to increase (of course, correspondingly, it is necessary to recalculate whether the pressure loss meets the system requirements and whether the length of the equipment bolts is appropriate). 5. The plate thickness of the light-weight plate heat exchanger is only 0.4~0.8mm, while the thickness of the heat exchange tube of the shell and tube heat exchanger is 2.0~2.5mm. The frame is much heavier, and the plate heat exchanger is generally only about 1/5 of the weight of the shell and tube type. 6. The price is low and the same material is used. Under the same heat exchange area, the price of the plate heat exchanger is about 40%~60% lower than that of the shell and tube type. g. The heat transfer plate of the plate heat exchanger is made by stamping, which has a high degree of standardization and can be mass-produced. The shell-and-tube heat exchanger is generally made by hand. 7. Easy to clean The frame plate heat exchanger can be loosened by loosening the pressing bolts, and the plates can be removed for mechanical cleaning, which is very convenient for the heat exchange process that requires frequent cleaning of the equipment. 8. Heat loss The small plate heat exchanger only has the shell plate of the heat transfer plate exposed to the atmosphere, so the heat dissipation loss can be ignored, and no insulation measures are required. The shell and tube heat exchanger has a large heat loss and requires an insulating layer. 9. The smaller capacity is 10%~20% of the shell and tube heat exchanger. 10. The pressure loss per unit length is large. Because the gap between the heat transfer surfaces is small, the heat transfer surface has unevenness, so the pressure loss is larger than that of the traditional smooth tube. 11. It is not easy to scale due to the sufficient turbulence inside, so it is not easy to scale, and its scaling coefficient is only 1/3~1/10 of that of shell and tube heat exchangers.
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