Views:1 Author:Site Editor Publish Time: 2021-03-19 Origin:Site
A brief introduction is made according to how to choose the heat exchanger plate of the heat exchanger:
1 Selection of plate type of heat exchanger
The plate type or corrugated type should be determined according to the actual needs of the heat exchange occasion. If the flow rate is large and the pressure drop is small, the plate type with small resistance should be selected, otherwise, the plate type with large resistance should be selected. According to the fluid pressure and temperature, determine whether to choose a detachable or a brazed type.
When determining the plate type, it is not advisable to choose a plate with a single plate area that is too small, lest there are too many plates, the flow velocity between the plates is too small, and the heat transfer coefficient is too low. This problem should be paid more attention to for larger heat exchangers.
2 Selection of process and flow channel
The process refers to a set of parallel flow channels in the same flow direction of a medium in the plate heat exchanger, and the flow channel refers to the medium flow channel composed of two adjacent plates in the plate heat exchanger. Generally, several flow channels are connected in parallel or in series to form different combinations of cold and hot medium channels.
The process combination form should be calculated based on heat exchange and fluid resistance, and determined under the requirements of process conditions. Try to make the convective heat transfer coefficients in the cold and hot water channels equal or close to get the best heat transfer effect.
Because the convective heat transfer coefficient on both sides of the heat transfer surface is equal or close to the heat transfer coefficient to obtain a larger value. Although the flow velocity between the plates of the plate heat exchanger is not equal, the average flow velocity is still used in the calculation of heat exchange and fluid resistance. Since the pipes of the "U"-shaped single process are all fixed on the compression plate, it is convenient to disassemble and assemble. Power station valve
3 Pressure drop check
In the design and selection of plate heat exchangers, there are generally certain requirements for pressure drop, so it should be checked. If the check pressure drop exceeds the allowable pressure drop, the design selection calculation needs to be re-calculated until the process requirements are met.