In a modulating mechanical atomization system used with an oil burner, what is required for correct atomization?

In a modulating mechanical atomization system used with an oil burner, very high pump pressure is essential for achieving correct atomization of the fuel. The primary function of this high pressure is to break the fuel into fine droplets, which enhances the combustion process. Atomization involves transforming liquid fuel into a mist, allowing for more efficient mixing with air and subsequent burning.

Higher pump pressure helps to create smaller droplet sizes, which leads to better combustion characteristics. The ideal atomization level ensures that the fuel burns completely and efficiently, reducing smoke and unburned hydrocarbons in the flue gases. In contrast, lower pressures would produce larger droplets, which could hinder effective combustion and increase emissions.

Maintaining high pump pressure enables the system to adapt to varying operational demands, especially in modulating systems where fuel requirements can change based on the heat load.

The other options do not contribute effectively to the atomization process needed for optimal burner performance. For instance, low temperature can lead to increased viscosity of the fuel, making it more difficult to atomize, while medium pump pressure may not be sufficient to achieve the fine droplet size required for efficient combustion. A constant flow rate is necessary for consistent operation but does not guarantee proper atomization without the corresponding high pressure.