NFPA 86-2019 Standard for Ovens and Furnaces

NFPA 86-2019 Standard for Ovens and Furnaces. 3.3 General Definitions. 3.3.1 Afterburner. See 3.3.52.2.1. 3.3.2 Air. 3.3.2.1 Burnout Air. Air introduced into a furnace chamber for the purpose of burning out flammable atmospheres, residual soot, or other carbonaceous material. 3.3.2.2 Combustion Air. The air necessary to provide for the complete combustion of fuel and usually consisting of primary air, secondary air, and excess air. [211, 2016) 3.3.2.3 Primary Air. All air supplied through the burner. 3.3,2,4 Process Control Air. Air introduced to a furnace containing a special atmosphere to establish a controlled oxygen level or carbon potential. 3.3.2.5 Reaction Air. All the air that, when reacted with gas in an endothermic generator by the indirect addition of heat, becomes a special atmosphere gas. 3.3.2,6 Secondary Air. All the combustion air that is intentionally allowed to enter the combustion chamber in excess of primary air. 3.3.3 Automatic Fire Check. A flame arrester equipped with a check valve to shut off the fuel gas supply automatically if backfire occurs. 3.3.4 Backfire Arrester. A flame arrester installed In fully premixed air—fuel gas distribution piping to terminate flame propagation therein, shut off fuel supply, and relieve pressure resulting from a backfire. 3.3.5 Burner. A device or group of devices used for the introduction of fuel, air, oxygen, or oxygen-enriched air into a furnace at the required velocities, turbulence, and concentrahon to maintain ignition and combustion of fuel. 3,3.5,1 Atmospheric Burner. A burner used in a low- pressure fuel gas or atmospheric system that requires secondary air for complete combustion. 3.3.5.2 AtomIzing Burner. A burner In which oil is divided into a fine sp’ay by an atomizing agent, such as steam or air.NFPA 86 pdf download.