Why do HRSGs Use Finned Tubes？

The reason why finned tubes are used in HRSG: to improve the efficiency of waste heat boilers, the temperature difference between smoke temperature and boiler steam temperature must be reduced. There are area, resistance and temperature difference contradictions. The heating area of waste heat boiler will be increased. In order to reduce the flow resistance loss, the flow area can be increased and the flow speed can be reduced. However, the low speed flow is bound to reduce the heat transfer efficiency; So as to increase the heat transfer area; In turn, the area of the HRSG will increase to infinity; The use of spiral finned tube can ensure enough heat transfer area, enhance heat transfer, and can reduce the flue gas resistance!