In scenarios such as hydraulic oil cooling, domestic hot water preparation, and process fluid heat recovery, heat exchanger selection often requires weighing welded plate solutions against shell-and-tube solutions. The YBJ-35 welded plate heat exchanger is formed by welding plate packs, offering a compact structure and a relatively large heat transfer area per unit volume, making it suitable for retrofit projects with limited space; the shell-and-tube solution, on the other hand, facilitates mechanical cleaning and has relatively higher tolerance for media with high suspended solids. Neither has an absolute advantage; the judgment should be made based on media characteristics and O&M conditions.
Before commissioning, it should be confirmed item by item that the flanges at each interface are tightened without leakage and that pressure gauges and thermometers are within their valid calibration periods. Compared with shell-and-tube, welded plate types have narrower flow channels and are more sensitive to particulate deposition; if the process side contains fibers or large particulate impurities, a filtration device should preferably be added at the inlet; while shell-and-tube types can be cleaned by withdrawing the tube bundle after fouling, showing a clear difference in maintenance approach. When comparing solutions, technical engineers can incorporate cleaning cycles and downtime costs into the evaluation.
Corrosive media are a key variable in selection. For welded plate heat exchangers, the compatibility of plate material and sealing material must be checked to avoid leakage caused by improper selection. For example, media containing chloride ions pose a stress corrosion risk to stainless steel plates; in such cases, the applicability of duplex steel or titanium should be evaluated, and the temperature and corrosion resistance grades of the gaskets should be confirmed. Compared with shell-and-tube, the sealing points of welded plate types are distributed along the plate periphery, and the choice of sealing material has a more direct impact on overall reliability. It is recommended to specify the medium composition, concentration, and temperature range in the procurement technical agreement, and have the supplier issue a material compatibility statement.
