Selection of burner

Combustion volume

The space occupied by the fuel and the products of combustion varies considerably with the burner design, upstream pressures and flow rates. Gaseous fuel burners can be designed to release heat as high as  of combustion volume.

Stability 
   
Turndown ratio is defined as the ratio of minimum heat input rate to maximum heat input rate. Minimum heat input rate is controlled by the phenomenon “back fire” whereas maximum heat input is controlled by the extinguishing of the flame. If the velocity of mixture of fuel +air is greater than flame velocity, flame will extinguish. The back fire will occur when the velocity of mixture of fuel +air is lower than flame velocity,

Combustion systems and burner components

Gaseous fuel supply, air supply and control valves form the essential components of a gaseous fuel burner. Further a burner designed for one particular fuel is not suitable for other

Liquid fuel burners are two types: Oil is vaporized before ignition, and atomization followed by combustion.

Atomized type burners are commonly used. Mechanism of atomization of oil differentiates the burners. Oil may be atomized mechanically by a rotation disc or cup or swirled. High pressure air is also used to atomize the fuel. For details the reader may see the following references.

References:

O.P.Gupta: elements of fuels, furnaces and refractories