In an oil fired boiler, how does the fuel enter the furnace before being ignited?

In an oil-fired boiler, the fuel typically enters the furnace in a vaporized state before ignition occurs. This process is crucial for efficient combustion. When oil is used as a fuel, it is first atomized into fine droplets through a nozzle or spray. This atomization process increases the surface area of the oil, allowing it to mix more thoroughly with air.

When the atomized oil reaches the furnace, it then vaporizes, transforming into a gas that can ignite more easily and burn efficiently when mixed with the appropriate amount of combustion air. This ensures that the combustion process is complete, which is essential for maximizing energy output and minimizing harmful emissions.

The other states of the fuel—liquid, solid, and gas—are either not suitable for combustion in a boiler or do not occur in the correct sequence for efficient operation. Liquid oil needs to be atomized, and solid forms of fuel are typically not used in an oil-fired system. Thus, the vaporized state is necessary for optimal combustion performance in an oil-fired boiler.