A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes.
As global climate is facing serious challenge, clean energy becomes the core part in the energy structure, of which gas and oil, the energy saving and clean combustion fuels are the popular choices in boiler equipment.
The boiler can be divided into soft coal boiler, high sulfur coal boiler, liquid fuel boiler, coal fired boiler and fire tube boiler by the fuel. Both water-fire tube boiler and horizontal fire tube boiler belong to the fire tube boiler.
Currently, fossil fuels such as oil, coal and natural gas represent the prime energy sources in the world.
Because of the different properties of the waste heat smoke, the type and structure of the waste heat boiler are different.