Difference: SZS is a water tube boiler, WNS is a fire tube boiler
Advantages: The SZS furnace is larger, and the membrane wall structure is suitable for large tonnage. The fuel can be used in a wider range. It also uses low-nitrogen reconstruction at a later stage, which has a high purchase price. Superheating devices can be added to produce superheated steam with higher steam purity.
Disadvantages: SZS is slightly larger and has a higher manufacturing process. Currently, only large boiler plants can undergo production.