SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL

**Definition:** This place covers:

Supply of air or non-combustible gases or liquids to combustion apparatus in general, for example:

**Limiting references (this place does not cover):** - Air-supply arrangements for fluent fuels -> F23C - Firebridges for delivery of air or steam to combustion apparatus -> F23M3/04 - Baffles or deflectors for air or combustion products with air-supply passages -> F23M9/04 - Dampers and throat restrictors for open fire-places -> F24 - Air inlet valves for open fire fronts -> F24

**Glossary:** - Air: a mixture of gases containing free oxygen and able to promote or support combustion - Primary air: air supplied to the burning fuel in order to liberate combustible gases - Secondary air: air supplied to the combustible gases liberated by the primary air in order to complete their combustion. The term "secondary air" covers "tertiary air" etc. - Ash: means any solid combustion residues, for example remaining in the fuel bed or suspended in the flue gases - 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 - 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 zone: the part of the apparatus where the reaction takes place between air and fuel - Firebridge: a low wall separating the fuel bed from adjacent flue gas passages in apparatus for combustion of solid fuel, for example in reverberatory furnaces or fire-tube boilers - Flue gases: any gaseous products of combustion - Grate: a perforated surface, e.g. a grid, which supports or delimits a bed of burning fuel and serves to supply primary air