Plate and frame heat exchangers are widely used in metallurgical mining, petroleum, chemical, electric power, pharmaceutical, food, chemical fiber, paper, textile, and central heating industries. Moreover, the plate heat exchanger can handle a wide range of fluids, so it is not negligible to choose a good plate heat exchanger. How can we choose a good plate heat exchanger?
1. Plate heat exchanger plate type selection
The plate type or corrugated type should be determined according to the actual needs of the heat exchange occasion.For the case where the allowable pressure drop is large, the plate type with low resistance should be selected, otherwise the plate with large resistance should be selected.Depending on the fluid pressure and temperature, it is determined whether the detachable or brazed type is selected.When determining the plate heat exchanger plate type, it is not suitable to select a plate with too small a single plate area, so as to avoid the excessive number of plates to be installed, the flow velocity between the plates is small, and the heat transfer coefficient is too low. It should be pay more attention to this problem for larger heat exchangers.
2. Plate heat exchanger pressure drop check
In the design and selection of the plate heat exchanger, there is a certain requirement for the pressure drop, so it should be checked.If the check pressure drop exceeds the allowable pressure drop, the design selection calculation must be repeated until the process requirements are met.
3. Plate heat exchanger pass and flow channel selection
A pass refers to a set of parallel flow paths in the same flow direction of a medium in a plate heat exchanger.The flow channel refers to a medium flow channel composed of two adjacent plates in the plate heat exchanger.In general, several flow passages are connected in parallel or in series to form different combinations of cold and heat medium passages.