Fire tube biomass boilers

Horizontal cylindrical hot water boilers

Horizontal cylindrical boilers are cheaper. However, their disadvantage is that more production time is lost for the stops required for cleaning.

Vertical cylindrical hot water boilers

In the vertical hot water boilers the flue gasses initially flow downwards through a radiation section. The flue gasses are reversed into vertical pipes when they reach the bottom of the boiler. Due to the vertical orientation the soot blowers clean the pipes more efficiently. In this configuration the soot always falls vertically, in the flow direction or the opposite direction, and is unable to deposit again which is a frequent issue with horizontal flame tube boilers.

Cylindrical steam boilers

Horizontal cylindrical boilers are often used for steam production up to 32 bar as a cost saving measure. The flue gasses are first cooled in the radiation cooler before they enter the flame tubes. At pressures up to 20 bar the radiation cooler is integrated in the boiler, however for pressures in excess of 20 bar another radiation cooler, a larger room of membrane walls, is installed before the boiler inlet.