Flame Retention

[aberdeen89]

I am a newly time served plumber and am away to sit several gas courses, while doing a bit of revision i came across flame retention in gas cookers, but am not 100% what this is or how it is prevented, if some one could tell me or send me a link that would help it would be much appreciated

 

[CMairiD]

Because natural gas has a low flame speed, a lot of burners have flame retention devices prevent the primary flame from lifting off the burner. Flame retention flames are created by a slower air/gas mixture to create smaller, more stable flames to continuously re-light the main flame as it tries to lift off the burner.

 

[REDSAW]

just as it says in the viper book on gas then?.

 

[CMairiD]

Dunno, does it? Only so many ways you can describe it.

 

[GrahamM]

The gas is pushed through the narrower retention ports so produces a finer, more stable flame. This stablises the larger main burner port flame preventing it from lifting off.

Something along those lines, been a while since covered it.

 

[crashndie]

as grayham said best way to see it is light your cooker and look at the burner you will see a large blue flame at the top and a smaller narrow flame right next the ring the small ring keeps the main flame lit, if it didnt have the retention ring the main fame would lift off and go out.

 

[aberdeen89]

Thanks, i understand it more now, cheers