In industrial flue gas waste heat recovery systems, uneven temperature distribution on the outer wall of ducts is often a phenomenon to note during model selection. Finned tube heat exchangers extend the heating surface through fins, increasing the heat exchange area on the flue gas side, thereby achieving heat exchange within a limited space. The GCS-680 finned tube heat exchanger is designed for dusty flue gas conditions. The base tube can be made of carbon steel, stainless steel, or ND steel, and the fin material matches the base tube, reducing the possibility of early failure due to electrochemical corrosion.
During design and selection, it is recommended that procurement personnel work with technical personnel to calculate the required number of finned tube rows based on flue gas flow rate, inlet temperature, and allowable pressure drop, and then verify whether the base tube wall temperature is within the allowable range of the material. The GCS-680 finned tube heat exchanger commonly uses base tube specifications of Φ32×3 mm or Φ38×3.5 mm, fin height of 12~16 mm, and fin spacing of 4~8 mm, which can be adjusted according to ash deposition tendency. The design temperature range is -20~450°C, the design pressure is 1.6 MPa, and the interface flange standard can be matched to the user's existing pipeline.
When operation and maintenance personnel check the nameplate, it is recommended to pay attention to the margin between the design temperature and the actual on-site flue gas temperature, as well as whether the interface flange standard is consistent with the existing pipeline. For sulfur-containing flue gas, ND steel base tubes have relatively good corrosion resistance in dew point corrosion environments, but the wall temperature needs to be calculated based on flue gas composition. During procurement, the material combination of the base tube and fins, the arrangement of finned tubes, and the allowable pressure drop should be clearly specified.
This model is suitable for scenarios such as boiler tail flue gas waste heat recovery, industrial kiln exhaust cooling, and hot air circulation in drying equipment, and can be arranged upstream of dust removal and desulfurization processes. In retrofit projects with limited space, it can adapt to the original foundation by adjusting fin spacing and the number of tube rows. Specific selection needs to be confirmed by technical personnel based on flue gas parameters and on-site conditions.
