Info

500 to 800

Table 5-1 Representative Ignition Temperature of Fuels in Air. Source: Babcock & Wilcox

Table 5-1 Representative Ignition Temperature of Fuels in Air. Source: Babcock & Wilcox

Upon ignition, the incoming fuel-air mixture (including non-combustibles) heats up. Radiation or direct contact with surrounding gases or solids transfers the heat. The flame temperature is highest when the losses to the surroundings are lowest. Addition of excess air or fuel provides more material to absorb the heat of combustion, and therefore lowers the flame temperature.

Efficiency increases with increased flame temperature. Beyond approximately 3,500°F (1,927°C), dissociation, or reverse combustion, occurs and heat that was originally liberated is absorbed by the breakdown of combustion products into combustibles and oxygen, slowing the rise of flame temperature.

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