Derek, if you have good gas it will have a lot of hydrogen in it, but you
can barely see a hysdrogen flame its not yellow its transparent. if you
have yellow its carbon volatiles, and if there are flecks of yellow in the
flame its unburnt carbon.- The blue color is carbon monoxide.Thats what you
look for. Ken C. Original Message -----
From: "derek schulze" <[email protected]>
To: "Discussion of biomass pyrolysis and gasification"
<[email protected]>
Sent: Monday, October 04, 2010 3:58 PM
Subject: Re: [Gasification] cherry pits again
Is it possible that I am getting hydrogen burning to get the bright yellow
color? There is a fair amount of moisture in the cherry pits.
On Sun, Oct 3, 2010 at 10:19 PM, Ken Calvert <[email protected]> wrote:
Derek, what you describe is like setting up an oxy acetylene blow torch.
Pure acetylene is all yellow with great shreds of carbon soot coming
out
the endof the flame. As you open up the oxygen it starts getting greenish
blue at the base and ends in yellow. When you getthe oxygen just right
there
is no yellow only two shades of blue, with a darker shade in the middleof
the flame and a blue violet where the yellow was.
For a good gasifier output you want that outer blue violet colour all
through. Using air instead of oxygen, you do not get the intense
combustion
of the inner cone of a gas torch! Ken C.
----- Original Message ----- From: "derek schulze" <[email protected]>
To: "Discussion of biomass pyrolysis and gasification" <
[email protected]>
Sent: Monday, October 04, 2010 1:48 AM
Subject: [Gasification] cherry pits again
I have managed to build my pilot project cherry pit gasifier and it is
working with the wet pits! - well at least it is producing gas that is
burning reliably.
Now I have a couple of questions:
1) My question is regarding the color of the flame. It appears to be
blue-ish yellow near the base, but turns yellow near the top. The
yellow
is
not a deep orange color, but rather a bright yellow. There is little to
no
sooting off the flame and no visible smoke. I have made two different
burner designs as I was concerned about proper air introduction into the
gas
prior to combustion with little to no change Either I am not cracking
the
tar adequately, or there is a lot of sodium in the pits. Any thoughts?
No
I do not have a temperature probe in the reaction zone. As I will be
burning the gas in a boiler, I am not overly concerned about the gas,
but
I
do not want to have excessive tar buildup if it can be avoided.
2) The gasifier was producing a lot of moisture and tar for the first
hour
of operation but it's production slow substantially after that. I did
quite
a bit of tweaking in that hour.
3) Should I be using some coal or char at the base to help improve the
cracking? Will the ash left from the first burn be adequate?
I'll post a photo/video somewhere once I get the files off the camera.
-Derek
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