We have single gas fired burner. It is very old boiler. What will be the Fuel/Air ratio we should maintain? We have DUV- 470 UV of DURAG make Detector and amplifier. We set it at sensitivity in 1 mood i.e. 1st mood. What will be the optimum setting value we have to set in UV amplifier. How UV detector works and how is o/p indicator will increase with respect to fuel/air ratio. What will be the best o/p vale of this type of amplifier?

 

Really, _you_ should be telling us, if you are going to be messing with combustion controls. I hope you don't lose more than your eyebrows.

Regards
cww

 

This does remind me of when, in my younger days I was working in a heat treating operation set up in an old warehouse. I cam in one day and the place was cold and the quench tank was freezing over. The place was heated by an old oil furnace that had a stack rising 30 feet to the ceiling. It didn't want to stay running and I called the owner to ask if I should look at it or call someone. He said, "don't touch it, I'll get the boiler guy out to look at it" That was OK, because I didn't feel like getting all black and reeking of #2 for minimum wage. I fired up the electric track furnace and changed all the charts, etc. Here comes "Jumper Joe", the boiler guy. I was working where I couldn't see what he was doing but I was getting cold, and concerned because I heard a couple "woofs" come from over there. He had it running for about 5 minutes when it quit again. I was just coming around a row of stacked boxes when I saw the white "smoke" come pouring out of the furnace and I started heading for the door. "Whoooomp" and I got a push and there was a lot of clanging and crashing. I turned around and didn't see any fire, so I gathered up some snow and went back in to see if the guy was all right. I dropped the snow on his coveralls where they were smoking and helped him up. He was OK because we were both bundled up in cold weather gear, and he got standing before it blew, but he was covered in oily soot and it was snowing black in the building. It had flattened all the stovepipe sections to the roof and the sheet metal was scattered all over. I tendered my resignation, shut everything down, and told him _he_ could call the owner.

Someday, I'll tell how they dusted an entire foundry, but that one is still too recent to laugh about:^) The moral is: You should know what you're doing when working with flammable and potentially explosive gases.

Regards
cww

 

I cannot for sure answer your question about fuel/air ratio except that it should be what we called a Stoichiometry ratio have a look at this
http://en.wikipedia.org/wiki/Stoichiometry.

they have a very chart with different type of fuel and corresponding volume or mass of air to be in the correct ratio of combustion, this can be useful.

But I am almost sure that you cannot adjust this ratio using your UV detectors!

UV detectors will only detect the presence (or absence) of Flame (Ultraviolet light in the fire in case) and won't be proportional to the flame concentration. The amplifier is just there to adjust the sensitivity of your sensor (it is just a guess as i don't know your system particularly).

We have the same UV detectors in turbine (Not the same type as you describe but UV are UV isn't it?). and I can insure you this is not because we increase the power on the turbine that the UV level will increase proportionally. it will increase slightly. I am agree but you cannot predict anything from this, except the fact that if they become weak. you better check you combustion you are very close to a "flame out trip" of the turbine

 

Sorry, I'm reviving the issue. But I have a similar problem with a siemens burner. I'm having a problem with ignition. Anyone with experience that can help?