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[KBIO]

Hello!
I open a new post here as I feel like the discussion on the burner will be important.
I really appreciate your help and comments in my project and I wish that we all benefit of those exchanges and ideas.
Palsembleu! What a forum!
I took note of your interesting comments concerning the burner and the gas tank.
First, I want to say that since I managed to work out the burner supply in liquid butane, I do not have no more gas tank pressure depleting as it is in gas phase and I stick to this "technology" , except on small rigs.
Also, I understand that nothing can be taken for granted and that everybody's experience is good to share. I think of Xrad and the copper end plate idea to hold on the heat. But as I said, the super heater buckle should do the job. However, I keep this option in a corner of my mind.
In any case, I shall keep the possibility to open up the boiler for modification, as well as the choice of the burner.
Now,I have an important question! I read here and there : parafin burner, kerosene burner,... BUt what is exactly the fluid used.
Gasoline, diesel, Jet plane fuel,...? That will help me to progress at this point.
Following is a small video, I did this afternoon , to start the discussion.
http://www.youtube.com/watch?v=_1DNVCx6zgI&feature=share&list=UU1noekclgrOUgNhW1958Zng

As you can see, the tank is 55 cc ( 80mm x 30)
The pressure builds up inside although I have a 35/100 jet (+/- 200 gr/H)
If you look at my rig up, I have no check valve, so the heat raises the pressure enough to maintain a good rate.
The regulator maintain a steady flow rate at +/- 0.4 bar. It is set with a nitril diaphragm but I recommend needle regulator for liquid phase.
It lasts for 10 min.
If I need more heat for my boiler, I can put a bigger diameter nose , also a longer nose will soften the flare. I can also change the jet size, but I do not see any interest at this stage. I can modulate the air intake on secondary entrance , to warm up the flame.
A lot of possibilties, though!
This video to show how low, we can reduce the flame and put it back without blowing it out. Excellent for pilote light when regulating pressure.
http://www.youtube.com/watch?v=l7R-SrULr54&list=UU1noekclgrOUgNhW1958Zng&feature=share&index=2

That's all I have for the time being, but I'm sure that I'll get the right answer with you guy's.
Thanks a lot and my best regards.

[xrad]

very nice burners. either one will make the steam you need, I suspect.  Just need a good boiler design.

[rfurzer]

Hi
I am designing burners too- using a 0.45 jet. I have some similar results with a 20mm burner tube. What dia and how many air holes do you have?
How does your burner go in a flue?
Russ

[KBIO]

Hello!
Sorry Russ to answer so late. I've been warned by my PC.
You will know everything on my burner , looking at the drawing on my Forum.
No need to speak french, just look at the drawing. Originally, this burner was made of stainless steal sheet rolled around a 20mm stick, but I found 20mm tubes in stainless. So --------easier!
I have a 0.35 jet and there must be a video somewhere showing it working in my Rayman (kind of! ) boiler.
I reach 6 bars within 4 min . The quantity of water is 350cc.
http://modelismenavalradioc.nouvellestar6.com/t10168-realisation-d-un-bruleur-type-bobino-300gr-heure

thanks for your interest.
Cheers.

[rfurzer]

Thanks- that's a beautiful drawing.
I am interested that you get 300g/h with 0.35mm. I get about 200 with 0.45.
R

[KBIO]

Hello Russ.
Actually, I estimate my gaz consumption according to this old table:
There must be more modern charts, easier to read today!
I always have +>2 bar in my gas tank .
Below 1 bar, the flamme is weak and it is hard to warm up the boiler.
I did some comparison by weighting the tank, before and after and I must admit that there is a différence on +/- 20% with the table.
I also made some test , to warm up with 1 bar and 2.5 bar. It took me half the time to empty my tank with double pressure.
This is maybe why there is , also, a difference bertween you and me. Probably coming from the pressure and temp rather than the jet's size itself.

Also, I squeeze the gas out of the tank from the bottom (liquid phase). So my tank pressure does not drop so fast and so low as when pulling out direct gas.
I hope , it answers to your question.
Regards.