REGULATING OR CONTROLLING COMBUSTION

**Definition:** This place covers:

Means and methods for regulating or controlling combustion, including details of the accessories and components for carrying out said controls such as for example fuel valves, detectors, sensors, timers independently of the type of the fuel which is burned.

Safety controls.

Pneumatic, electronic, electrical or hydraulic circuits used for controlling or regulating combustion.

**Limiting references (this place does not cover):** - Control devices specially adapted for fluidised-bed combustion apparatus -> F23C10/28 - Condition reponsive controls for regulating combustion in domestic stoves with open fires for solid fuel -> F24B1/187

**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: means the direct combination of oxygen gas, e.g. in air, and a burnable substance - 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 - 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 - 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