Plate heat exchangers

The type plate heat exchanger main frame (removable) and brazed into two categories, the main form of plates with chevron corrugated board, corrugated board and the level of tumor-shaped flat plate of three
 The basic structure of plate heat exchanger
  Plate heat exchanger plate mainly by the framework and the other two major components.
  Plates made of various materials ,different forms of abrasive pressed into corrugated shapes, and in the four corners of plate angle on the opening hole for the media flow. The surrounding plates and the angle hole be sealed with a rubber gasket.
  Pressed by the fixed plate frame, activity compression plate, the upper and lower guide rod and clamping bolts and other accessories.
  The characteristics of plate heat exchanger (plate heat exchanger shell and tube heat exchanger with the comparison)
  1.. high heat transfer coefficient between the different corrugated plate upside down, a complex of the flow channel, the fluid flow in the corrugated board was rotated between the three-dimensional flow in low Reynolds number (typically Re = 50 ~ 200) under generated turbulence, so the heat transfer coefficient is high, generally considered to be shell and tube 3 to 5 times.
2, logarithmic mean temperature difference, the small temperature difference between the end of the shell and tube heat exchanger, two fluids, respectively, and the shell in the tube side flow, flow in general is wrong, logarithmic mean temperature difference correction factor is small, and the plate heat exchangers and stream or more than a way of counter-current flow, the correction factor is also usually around 0.95, in addition, cold and hot fluid in the plate heat exchanger the flow parallel to the heat transfer surface, no bypass flow, thus making the plate heat exchanger small temperature difference between the end device, the water heat exchanger can be less than 1 ℃, and the shell and tube heat exchanger is generally 5 ℃.
  3. small area of compact plate heat exchanger, the heat transfer area per unit volume of shell and tube 2 to 5 times, nor as to allow a shell and tube bundle out of the repair area, so to achieve the same heat transfer, heat exchanger area of shell and tube heat exchanger is about 1 / 5 ~ 1 / 10.
4. easy to change the combination of heat transfer area or process, as long as the increase or decrease in a few panels, you can increase or decrease the heat transfer area to achieve the purpose; change or replacement of plates arranged in a few plates, you can achieve the required process composition and adapt to new conditions of heat transfer, and shell and tube heat exchanger to increase heat transfer area is almost impossible.
  5. weight plate heat exchanger plate thickness of only 0.4 ~ 0.8mm, while the shell and tube heat exchanger tubes of thickness 2.0 ~ 2.5mm, shell and tube heat exchanger shell framework than much heavier, plate heat exchanger shell and tube generally only the weight of about 1 / 5.
6. low prices with the same material, in the same heat transfer area, the plate heat exchanger shell and tube about the price lower than the 40% to 60%.
  7. to facilitate production of plate heat exchanger heat transfer plate is used stamping, high degree of standardization, and mass production, shell and tube heat exchangers commonly used hand.
  8. easy to clean as long as the plate heat exchanger frame loose bolts, you can release the plate beam, remove the plate for mechanical cleaning, which require frequent cleaning equipment for the heat transfer process is very convenient.