How To Control The Fouling Thermal Resistance of Finned Tube Radiator

How to Control the Fouling Thermal Resistance of Finned Tube Radiator

How to control the fouling thermal resistance of finned tube radiator is as follows:

1, Increase the flow rate of the fluid, so that the fluid has a large self-blowing dust capacity.

2、It is difficult to adjust the distance between fins and tube header, such as fin header spacing.

3、Installation of soot blowing device, the use of strong active active descaling means.

4、Select finned tube heat exchanger which is not easy to accumulate ash.

Due to the structural characteristics of the finned tube radiator, it is easy to become a scaling “shelter”, when the flue gas ash content is large, the flue gas flow rate is low, or there is corrosion exposure, the dirt thermal resistance is larger. When the fouling thermal resistance accounts for a large proportion of the total heat transfer resistance of the equipment, the design calculation of the equipment becomes meaningless. This is because the fouling thermal resistance is estimated and selected, and the other thermal resistances are calculated by various formulas and correlations.

When the estimated fouling resistance reaches a corresponding level, the calculation of other thermal resistances becomes meaningless. In addition, if the fouling thermal resistance is too high, it will increase the area of the finned tube radiator and increase the operation and investment cost of the equipment. If the equipment has good heat transfer performance at the beginning of operation, but the heat transfer effect is found to decrease after a period of operation, the main reason may be ash and dirt. At the design stage, it is recommended to set a range of values that can withstand the fouling thermal resistance, for example, 20% of the total heat transfer resistance. If the fouling resistance is greater than this value, the designer should take appropriate measures to control it.