When purchasing a finned tube heat exchanger, incorporating maintenance convenience and inspectability into the preliminary selection helps reduce subsequent downtime costs. The following points are for procurement personnel's reference.
The base tube can be made of heat-resistant alloy steel, with a design task temperature of up to 850°C, meeting the hot air circulation requirements of heater supporting systems. The fin material should match the base tube and account for the corrosiveness of the medium. During procurement, the material combination and allowable pressure drop should be specified in the technical agreement, avoiding merely indicating flow rate and temperature.
The arrangement of finned tubes affects heat exchange efficiency and ash cleaning difficulty. During procurement, suppliers can be asked to explain the tube bundle layout to facilitate later identification of high-temperature areas. For working conditions prone to ash accumulation, an arrangement that facilitates cleaning should be selected, and installation positions for temperature monitoring points should be reserved.
High-temperature areas can be identified by adjusting the tube bundle layout or adding temperature monitoring points. During procurement, the number and location of monitoring points should be confirmed to grasp the temperature distribution during operation and, if necessary, upgrade the base tube material.
Allowable pressure drop is one of the key parameters for selection. During procurement, the upper pressure drop limit should be clarified in conjunction with the margin of the system fan or pump, avoiding energy consumption increases caused by excessive pressure drop.
Equipment layout should reserve maintenance space to facilitate fin cleaning and tube bundle inspection. During procurement, the supply cycle of wearing parts should be confirmed to provide support for subsequent maintenance.
