Application of spiral finned tube in waste heat boiler

Different types of spiral finned tubes: such as spiral fins, H-shaped or dish-shaped fins, etc., although they have been widely used in conventional power station boilers, circulating fluidized bed boilers, and waste heat boilers in metallurgy, chemical, building materials and other industries. application. However, in the design process, the standard calculation method of foreign introduction or the former Soviet Union is mainly adopted, and the long-term design experience of the designer or the simulation test result of the finned tube bundle of a certain structure is utilized. At present, there is no mature and standardized standard calculation method for various finned tube bundles in China.

The same is true for the heat transfer calculation of the spiral finned tube of the combined cycle waste heat boiler. In the introduction of foreign or the standard calculation method of the former Soviet Union, although there are some methods for calculating the heat transfer and resistance of the spiral finned tube bundle, there are limitations in the specific application. On the one hand are structural parameters such as tube bundle spacing, fin specifications, etc. On the other hand, the influence of the pollution characteristics of the gas turbine exhaust on the heat transfer calculation is not fully reflected.

In addition, the heat transfer characteristics of the spiral finned tube are related to the welding method and the welding rate of the fin, and the finned tube welding process at home and abroad inevitably has certain differences. The above factors limit the further optimization of the structure and arrangement of the finned tube and the heated surface and the localization of the finned tube bundle in the design of the finned tube heating surface of the combined cycle waste heat boiler and other waste heat boilers, and the degree of influence of the finned tube bundle is affected to some extent. Performance and cost of waste heat boilers.