Primary Air Fan and Secondary Air Fan are the different names of Forced Draft Fan. They all may be installed in the same Steam Boiler Assembly but they all operate at different levels of flow (m3/hr) and Head generated (mmwc). Sometimes excess air required for complete combustion is compensated by the same FD Fan or a separate FD Fan also known as a Secondary Air Fan is installed to carry out the function.
Forced Draft in a fan occurs when the fluid handled by the fan (generally air), is retained beyond the atmospheric pressure. Every fan designer must never underestimate the importance of the properties and composition of the fuel to be combusted and the bed height in the furnace.
We, Kinkum Machinery, have successfully designed, manufactured, and supplied forced draft fans to almost all of our customers and have successfully installed and commissioned them for highly efficient boiler operation.
