Burner CO2 settings and adjustment

[Burnerman]

Just playing around, really.
I've a Thorn Panda 55 boiler, rated at 19kW. I have 2 identical PL1 burners, both have new pumps (BFP 21 L3) and nozzles (Danfoss .60 80 deg H).
Pressure is set at 120 psi.
I took out the original burner for a check and clean today and rather than freeze popped in the spare.
On the replacement burner, I couldn't bring the CO2 down less than 11.4% - I believe the correct setting is 10.5%. Even with the air door way past its markings, it didn't want to play. Even fiddling with the pump pressure made little if any difference.
Back in with the original burner and I'm spot on at 10.5% - air door mid way.
Whats happening here, please? Am I dealing with one motor slower than the other, perhaps?
Looking forward to any theories!
John

 

[Terrywookfit]

You have far too much time to waste.
If no smoke why worry

Which burner is a PL 1 ? I can only remember blast tubes with this designation.

 

[Burnerman]

Terry, you are absolutely right Far too much time on me hands!
The small bit of paperwork I have mentions the burner as a PL1, but its probably the PL10 (orange one), very similar indeed to the Inter 99.
I'm just interested in any relationship between pressure and CO2 - just for my own curiosity!
The smoke on both burners was 0.
John

 

[dcawkwell]

Leak of fuel into the combustion. Perhaps nozzle is wrong. Either way
you have too much fuel being fired into the chamber.

(I had the same when I had forgotten to tighten the nozzle properly)

 

[Agile]

I was going to ask about the nozzle!

Do you have a clever oil flow rate meter to put in the oil line supply?

Tony




PS Surely you know the answer to the question I have asked a few times John.

What happens if you add say 30% of heating oil to your diesel vehicle?

 

[Burnerman]

All I can say about this one Tony and dcawkwell is that the nozzle was brand new, with no apparent leaks along the oil tube. Fired up on the bench the flame was bright and steady and symetrical, as it was with the other burner.
No worries - I'm sure the odd 1% CO2 difference isn't life threatening!
I am anxious to prevent overfiring though, as has happened some time in the past - baffles are no longer available so I'd have to make them.

Regarding the kero as diesel fuel Tony I suspect there wouldn't be any great difference at that percentage - historically diesel engines (especially direct injection ones) have been able to burn almost anything, but of course they were very low speed. I would suspect (read guess) that there would be an inclination towards pre ignition with the lower viscosity fuel, which would produce much heavier loads on pistons and crankshafts.
John

 

[oilhead]

Are you sure the blast tubes are the same? If there is less ventilation around the outside of the blast tube, you will not pass sufficient secondary air, and all the intake area makes no difference to the CO2. Make sure that the vent holes in the blast tube are clear. Also, does one have asecondary 'break plate' behind the diffuser. This will also reduce secondary air and keep CO2 high.

 

[Burnerman]

I have to admit blast tube wise, all I checked was the projection of the tube out from the burner by measurement......this was identical.
Visually they looked the same, although one burner was on the bench and the other in the boiler
Certainly the tubes were perfectly clean - in fact there was hardly any fouling before cleaning.
You've lost me regarding the 'break plate' - I don't know what this is, but certainly both burners were identical in every aspect.
Thanks for your interest - its appreciated!
John

 

[Terrywookfit]

Different blast tubes were fitted to the same burner to suit the characteristics of different boilers.

Also done with Riello burners .Especially on Camray 3

 

[Burnerman]

Yes fair comment - I've no idea which boiler the replacement burner came from, and although they looked completely similar I didn't count the holes / vanes at the end of the blast tube. The length and naturally the diameter were the same.
I guess that will have to wait until I get the two burners side by side again!
Regards
John

 

[oilhead]

break plate I referred to is a second plate/diffuser behind the diffuser in front that the nozzle fires through.
Terry refers to the Riello one which has a plate behind the front plate, that has a cut-out for the electrodes and is shaped like mickey mouse's ears!!
This stops the fan from pushing too much air past the nozzle causing flame detachment.

 

[muggles]

What happens if you add say 30% of heating oil to your diesel vehicle?

I..ahem...know someone...who ran a diesel Escort on 100% heating oil for about 18 months with no apparent adverse effects. Just saying

 

[Terrywookfit]

What happens if you add say 30% of heating oil to your diesel vehicle?

I..ahem...know someone...who ran a diesel Escort on 100% heating oil for about 18 months with no apparent adverse effects. Just saying

Do they not have ministry checks in deepest Devon.

 

[Burnerman]

Kerosene may have slightly less lubricity than genuine diesel fuel, and being a lighter gas oil will have slightly less heat output in kW......so it could give the injector pump a hard time and possible pre ignition may raise the temperature of the piston crown. Common rail and pumpe deuse engines, with massively high injection pressures may suffer premature injector failure.
In other words, it will burn fine and HMRC will look forward to the interview
There's a fair bit of red diesel being used up here, I suspect.
John

 

[muggles]

What happens if you add say 30% of heating oil to your diesel vehicle?

I..ahem...know someone...who ran a diesel Escort on 100% heating oil for about 18 months with no apparent adverse effects. Just saying

Do they not have ministry checks in deepest Devon.

They're about now and then but only for a day or two once or twice a year, normally around the motorway junctions.