Oil / Gas Fired Boilers are 3-pass internal furnace smoke-tube-type boilers in which flue gases are inside the tubes while water is outside the tubes in the shell.
The combustion of oil and gas in the furnace requires atomization of the fuel. Since the fuel entering the burner is in bulk amount, is either in liquid or gas form. Therefore it needs to be separated in fine droplets so that every last particle of the fuel could get burnt without leaving any traces. This process of separating the fluid particles is called atomization.
Generally, atomization is done with the help of high-pressure fan which also provides air for the combustion of fuel. The burners come with the attached fan and their assembly is known as a Monobloc Burner, which means that the fan is mounted on the burner.
The 3-pass oil/gas fired boilers are most suitable for the burn fuels like heavy or light oil or gas.
Difference between Oil Fired Boiler and Gas Fired Boilers :
Oil Fired Boilers generally require Day Oil Tank to store oil and this oil is transported to a burner through oil piping and oil pump.
On the other hand, High-Efficiency Gas Fired Boilers although they share the same design as the Oil Fired Boilers, the only difference is the transportation of gas to burner. Gas Fired Burners require gas a train which comprises of a regulator (to regulate pressure), and a strainer (to remove dirt from the gas). No such valves are required in oil fired boilers.
