Flame Scanners

[kujah]

Hi!

One of our charge furnaces have a problem on flame rods. Debris (castables) keep falling on the rods causing them to malfunction. Actually, the flame cut-out trip has already been by-passed to avoid accidental furnace tripping. I'd just like to ask if anybody would know how to keep the flame rod/scanner on-line without having fear of an accidental trip?

Brgrds,

 

[pmover]

the problem appears to be failing castables and not the flame rods. conduct repairs on the refractory.
by-passing critical instrumentation devices is asking for trouble.
-pmover

 

[unclesyd]

Have you thought about changing to a U.V. type flame scanner.
We used this type scanner on all systems with gas or oil burners.
We only use the rod type on small systems <3,000,000 BTU
We had a heat recovery furnace where falling refractory was big problem. Each burner had two scanners working togather to keep the furnace on line. One could fail and we wouldn't trip the gas valves. The system worked very well.
If you should use a U.V. type scanner watch out for hard radiation. These detectors are outstanding radiation detectors. The radiation will shut you down.

 

[kujah]

Thanks unclesyd!
Actually the furnace has a 3 out of 4 voting and typically operates at a duty of just under 20MMBtu/hr. We do not have any actual experience on non-contact flame detectors but I'll try to do some research on the possibilty of using such detectors.