Some applications have such a tremendous amount of draft (due to a very high smoke stack) therefore, we install a barometric damper to regulate the draft in conjunction with the opposed blade dampers. These dampers are adjustable via weights that are built into the back side of the unit. Barometric dampers have been around for a very long time and are very practical.
The servo motor modulates the dampers as needed throughout the firing range. The great thing about this setup is it allows us to control the draft within the boiler but it also is integrated into the overall Autoflame Combustion Control System. In some situations, a combination of the two is used to ensure a balanced draft which is the goal of any setup. Typically, we like to install opposed blade draft dampers to gain further control of the draft. The dampers rest just below the outlet of the boiler and rest on a shaft where we install an Autoflame servo motor. Depending on boilers design, the draft fan either forces the air through the boiler (forced draft) or pulls the air through the boiler (induced draft). We call it the “potato chip effect” where the burner diffuser is cooked. All firetube, water tube and cast iron boilers and specific burners alike require a specific amount of draft whether it be positive or negative. With our vast experience we feel as if we’ve “seen it all” however, there’s always a new situation that can truly make us scratch our collective heads.Ī draft fan can be used to control draft in a boiler. Draft is one of the most critical aspects in any boiler system. Too much negative draft can cause a flame to be pulled off the burner head whereas too much positive can create excessive heat at the head and cause premature failure.
0 kommentar(er)
