Forced Draft Fan

A boiler's or furnace's performance totally depends on proper air supplied to the furnace. Insufficient combustion air causes incomplete combustion, producing carbon monoxide, soot precipitation on the heat transfer surface and direct emissions violations. On the other side, the combustion air excess causes furnace temperature drops and decreases thermal efficiency; also excess heat is released through the stack. The Forced Draft Fan is responsible for maintaining balance between these two situations.

This fan is installed at the inlet to the combustion system to supply air to the furnace. It supplies fresh air to the furnace by positive pressure. It does the exact opposite things that an induced draft fan does. For example, the FD fan pushes dense, clean and cold air inside, while the ID fan pulls out the hot and ash-mixed gas. It allows the use of a high-efficiency impeller, so it can operate efficiently without the flue-gas-side erosion concerns of an induced draft fan. A VFD or inlet damper adjusts the air supply as the boiler load changes. That ensures an air-fuel ratio within the optimal combustion range.

The Forced Draft Fan delivers massive airflow and high peak pressures with a peak efficiency range on a non-overloading power curve. Engineers need to select impeller diameter ranges with motor power according to their needs for best outputs. Standard designed fans typically handle ambient inlet air and some applications may use customized preheated-air arrangements. This unit supplies combustion air for industrial combustion systems and helps regulate the air-fuel mixture for efficient burning. Which is a perfect fit for plant engineers, boiler manufacturers, and coal-fired, gas-fired, biomass and oil-fired combustion systems. Engineers need to select impeller diameter ranges with motor power according to their needs for best outputs. Standard designed fans typically handle ambient inlet air and some applications may use customized preheated-air arrangements. Its supplies combustion air for industrial combustion systems and helps regulate the air-fuel mixture for efficient burning. Which is a perfect fit for plant engineers, boiler manufacturers, and coal-fired, gas-fired, biomass and oil-fired combustion systems.