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-   -   Question about gas burner design (http://www.diychatroom.com/f17/question-about-gas-burner-design-33724/)

darsunt 12-14-2008 10:25 AM

Question about gas burner design
 
I recently scavenged an gas valve and burner from an old water heater. I noticed an odd thing in the design of the burner. The gas line does not connect directly to the burner, instead it ends about 2 inches below the burner plate itself. There is a hole in the gas line, and the gas looks like it rises up through open air, hits the burner plate, flows outward to the burner holes at the edge of the plate where it burns.

So the gas is lighter than air and rises up to the burner without any containment at all? It doesn't dissipate in the open air? How come the gas rising in the open air doesn't ignite? Does it need to mix with air before it can burn?

I've noticed the burner in a wall furnace seems to be of a similiar design, with the gas from the gas valve rising through open air before reaching the burner itself.

yuri 12-14-2008 10:38 AM

The design of the ports in the burner causes the air to swirl as it rises and mix with the gas and get ignited at the edge by the pilot light. Uses a venturi effect as well as natural draft.

Marvin Gardens 12-14-2008 12:44 PM

NG needs 1015 degrees and between 5%-15% concentration to ignite. Venturi systems are common and normal.

yuri 12-14-2008 01:10 PM

1100 posts. WOW. You guys keep busy. I did over 2000 in several years at H***Mech B4 the spammers killed it. Lots of talent here.

Cheers

Marvin Gardens 12-14-2008 01:37 PM

Quote:

Originally Posted by yuri (Post 197921)
1100 posts. WOW. You guys keep busy. I did over 2000 in several years at H***Mech B4 the spammers killed it. Lots of talent here.

Cheers

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