The BRF-90 plate-and-frame fin heat exchanger adopts a plate-and-frame structure, and the plate material can be carbon steel, 304 or 316L stainless steel. The fin type is plate-fin, and the fin spacing and height are determined according to the medium flow rate and allowable pressure drop. The heat exchange area per plate ranges from 0.3 to 1.2 square meters, and the design pressure is conventionally 1.0 MPa or 1.6 MPa, which can be adjusted according to on-site flange standards. Gasket materials can be nitrile rubber, EPDM or fluororubber, with corresponding temperature resistance ranges of -20~110°C, -40~150°C, and -20~200°C respectively.
During on-site operation and maintenance, attention should be paid to changes in medium inlet and outlet temperatures, flow rate and pressure drop. When the pressure drop exceeds 1.5 times the initial value, the plate surface scaling or fin channel blockage should be checked. During cleaning, reserve a withdrawal distance of at least 1.2 times the plate length in the direction of frame plate withdrawal. Fastening bolts should be tightened in diagonal sequence in several steps, and the torque value should refer to the accompanying documents to avoid gasket overcompression and deformation. If the medium contains particulate matter, it is recommended to install a filter at the inlet, with a filter mesh precision of no less than 0.5 mm.
Reduced heat exchange capacity is mostly caused by plate scaling or gasket aging. External leakage often occurs at the flange sealing surface or plate edges. Bolts can be tightened first; if ineffective, replace the gasket. Internal leakage is manifested as cross-contamination of the two media, requiring shutdown and disassembly of the plates to check for cracks or perforations. Fin-side blockage will cause a sudden rise in pressure drop, and low-pressure water or compressed air can be used for reverse purging.
Selection requires checking medium corrosiveness, heat load, temperature difference and allowable pressure drop. During installation, ensure the frame is level, and the connecting pipe flange is aligned with the on-site pipeline to avoid additional stress caused by forced assembly. When used for hydraulic oil cooling, it is recommended to install a bypass valve on the oil side to regulate oil temperature. When used for flue gas waste heat recovery, attention should be paid to dew point corrosion, and the exhaust gas temperature should be higher than the acid dew point.
It is suitable for HVAC water systems, medium-temperature sections of district heating, hydraulic oil cooling and chemical process heat exchange. It is not suitable for working conditions containing large amounts of fibers or easily crystallizing media. If used, backwashing measures should be added.
