Introduction of spiral plate heat exchanger

February 10, 2023

The diameter of the Spiral Plate Heat Exchanger is generally within 1.6m, the plate width is 200-1200mm, the extreme thickness is 2-4mm, and the distance between the two plates is 5-25mm. Common materials are carbon steel or stainless steel. The main advantages of the Spiral plate heat exchanger are compact structure and large heat transfer area per unit volume (about three times that of the Shell And Tube Heat Exchanger); the fluid allows a higher flow rate (the liquid can reach 2m/s, Gas up to 20m/s, the degree of turbulence is large, and the heat transfer coefficient is large (about 1 to 2 times that of the tube-and-tube heat exchanger); pure countercurrent operation can be realized; it is not easy to scale and block. Its main disadvantages are that the operating pressure and temperature should not be too high, the fluid flow resistance is relatively large, it is not easy to overhaul, and it has high requirements for welding quality. Therefore, the general operating pressure is lower than 2Okgf/cm2, and the temperature is below 300-400°C.

Introduction of Plate Heat Exchanger:

The plate heat exchanger is assembled by a group of rectangular metal thin plates arranged in parallel, lined with gaskets between adjacent plates and clamped by a frame. There are round holes at the four corners of the plate to form a fluid channel. The cold and hot fluids flow through the two sides of the same plate respectively, and exchange heat through the plate. Assemble the flow for it. The thickness of the plate is 0.5 ~ 3mm, usually pressed into various corrugated shapes.
The main advantages of plate heat exchangers are: compact structure, large heat transfer area per unit volume of equipment, about 250-1000m2/m3, while tube-and-tube heat exchangers are only 40-150m2/m3; high heat transfer coefficient, for Low-viscosity liquid heat transfer, the heat transfer coefficient can reach 1500~4700W/(m2.℃), the highest can reach 7000W/(m2.℃), flexible operation, large adaptability, the number of plates can be increased or decreased according to the need to adjust the heat transfer Small area, easy processing and manufacturing, convenient maintenance and cleaning, and less heat loss. Its main disadvantages are: due to the limitation of plate stiffness, gasket type and groove structure, the allowable operating pressure is low; due to the limitation of gasket material, the operating temperature cannot be too high. For synthetic rubber gaskets, the operating temperature It should not exceed 130°C, and it should also be lower than 250°C for compressed asbestos gaskets; due to the small plate spacing, small flow channel cross-section, and flow rate can not be too large, so the processing capacity is small, not easy to seal, easy to leak, easy to block.

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