ABSTRACT
The ignition of a combustible mixture of air and fuel gas may be accomplished by raising the temperature of a small volume of the mixture to a point at which combustion reactions begin and henceforth become self propagatory. For an air or natural gas mixture the ignition temperature is about 650 C. The ignition process may be effected manually or automatically or by a combination of auto or manual control but once initiated combustion must continue safely for as long as the burner is required to be in operation. In industrial burners even the ignition of the start gas may have to be accomplished in a time too short for safe manual ignition if the limitations on energy release during the start of ignition period are not to be exceeded. Hence the development of fully automatic burner controllers by which ignition times is strictly limited.
