The design and manufacture of plate-and-frame fin heat exchangers can refer to the relevant requirements of GB/T 151 "Heat Exchangers" and NB/T 47004 "Plate Heat Exchangers." Selection and design personnel must first clarify the medium characteristics, heat load, and allowable pressure drop, and then determine the frame plate withdrawal distance based on the installation space.
The materials of fins and plates should be selected according to the corrosiveness of the medium: carbon steel is suitable for general industrial water or oil conditions; 304 stainless steel is suitable for weakly corrosive media; for conditions with chloride ions or large acid-base fluctuations, 316L material is recommended. Different materials differ in thermal conductivity and corrosion resistance, and a comprehensive trade-off should be made.
Calculate the required heat exchange area according to the heat load and inlet/outlet temperature difference, and verify the flow velocity and pressure drop. During operation, attention should be paid to changes in medium inlet/outlet temperature, flow rate, and pressure drop. An abnormal increase in pressure drop may indicate fin fouling or blockage. The matching flange standard and pressure rating must be consistent with the on-site piping.
The frame plates need to be periodically withdrawn for cleaning or replacement of seals, and sufficient withdrawal distance should be reserved at the installation location. For retrofit projects with limited space, multiple units in parallel or a compact frame may be considered, but the pressure drop and flow distribution must be recalculated.
