BURNERS

**Definition:** This place covers:

Burners, i.e. devices by which fluid fuel, or solid fuel suspended in air, is passed to a combustion space where it burns to produce a self-supporting flame, for example, burners in which:

**Glossary:** - air: a mixture of gases containing free oxygen and able to promote or support combustion - burner: a device by which fluid fuel or solid fuel suspended in air is passed to a combustion space where it burns to produce a self-supporting flame. A burner includes means for feeding air that are arranged in immediate connection with a fuel feeding conduit, for example, concentric with it. - combustion: a heat-producing sequence of chemical reactions between a burnable substance and molecular oxygen, e.g. in air, in most cases generating light in the form of flames or a glow - combustion chamber: a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame - combustion space: the zone downstream of the fuel (and, where applicable, air) outlet where the reaction takes place between air and fuel - fuel: any combustible material that can be burned, regardless of whether the main purpose of burning it is for releasing energy therefrom or for disposing of it or rendering it less harmful - pilot flame: a small flame that is lit or kept alight in order to provide ignition to a more powerful burner - primary air: air supplied to the burning fuel in order to liberate combustible gases - retention flame: a small flame that is kept alight in order to maintain the uninterrupted operation of a more powerful burner - secondary air: air supplied to the combustible gases liberated by the primary air in order to complete their combustion. The expression "secondary air" covers "tertiary air", etc. - torch: a burner fired with fuel gas and oxygen and specially adapted to apply heat to a workpiece, for example, for use in welding, cutting or brazing