Plate heat exchanger advantages more than most

1, high coefficient of heat transfer due to the different corrugated plate upside down each other, constitute a complex flow, make the fluid in the flow passage between corrugated plate revolved and three dimensional flow at low Reynolds number ( General Re = 50 ~ 200) Under turbulent, so the heat transfer coefficient is high, generally considered a tube and shell type 3 ~ 5 times. 2, logarithmic mean temperature difference is big, small terminal temperature difference in tube and shell heat exchanger, two kinds of fluid flow in tube side and shell side, respectively, on the whole is wrong flow, logarithmic mean temperature difference correction coefficient is small, and the plate heat exchanger is more and flow or countercurrent flow mode, the correction coefficient is usually at 0. Around 95, in addition, cold and hot fluid flow in the plate heat exchanger is parallel to the heat transfer surface, no side stream, thus makes the plate heat exchanger at the end of the temperature difference is small, the water heat exchanger can be less than 1 ℃, shell and tube heat exchanger is usually 5 ℃. 3, cover an area of an area small, compact structure of plate heat exchanger, heat exchange area per unit volume for the tube shell type 2 ~ 5 times, also don't like tube shell type want to reserve a spare tube bundle service place, so for the same in heat, plate heat exchanger which covers an area of about 1/5 ~ 1/8 of tube and shell heat exchanger. 4, easy to change the heat transfer area or process combination, as long as the increase or decrease a few pieces of board, can achieve the purpose of increase or decrease heat transfer area. Change of plates or replace a few pieces of plate, can achieve the required process combination, adapt to the new working condition of heat transfer, shell and tube heat exchanger heat transfer area is almost impossible to increase. 5, light weight, the plate thickness of the plate heat exchanger is only 0. 4 to 0. 8 mm, while the thickness of the tube and shell heat exchanger of heat exchange tube of 2. 0 ~ 2. 5 mm, tube and shell shell much heavier than the framework of plate heat exchanger, plate heat exchanger in general around 1/5 of the weight of tube and shell. 6, low price of the same material, under the same heat transfer area, prices of plate heat exchanger tube shell type low about 40% ~ 60%. 7, convenient plate heat exchanger heat transfer plate is made by stamping processing, high degree of standardization, and can be mass production, usually use handmade tube heat exchanger. 8, easy cleaning frame type plate heat exchanger as long as the bolt looseness pressure, can loosen plate beam and plate for mechanical cleaning, heat transfer process of the need to constantly cleaning equipment is very convenient. 9, small heat loss only plate heat exchanger heat transfer plate shell plate is exposed to the atmosphere, so the heat loss can be neglected, also do not need to heat preservation measures. Heat exchanger of shell and tube heat loss is big, need to heat insulation layer. 10, capacity, smaller tube and shell heat exchanger is 10% ~ 20%. 11, the pressure loss of per unit length due to the small gap between the heat transfer surface, heat transfer surface has a concave and convex, therefore is bigger than traditional smooth pipe pressure loss. 12, not easy to scale due to internal fully turbulent, so not easy to scale, the scale coefficient is only of tube and shell heat exchanger 1/3 ~ 1/10. 13 shoulds not be too great, working pressure, medium temperature is unfavorable and exorbitant, may let the cat out of the plate heat exchanger using gasket seal, pressure should not be commonly more than 2. 5 mpa, medium temperature should be below 250 ℃, otherwise may leak.