Yesterday I got beaten about the ears over on the gasification list for asking for ways to maximize hydrogen generation in a wood gasifier.
One guy told me that hydrogen and oxygen in a balloon would blow up if ignited, and so (I guess)----- I shouldn’t ask any more dumb questions unless, I suppose I had a PHD in something related.
Surprise! I already knew that.
And no, I am not a Brown’s Gas guy, trying to get rich making hydrogen under the hood of my car. I just want to understand a little more about role that wood moisture content and incoming air moisture play in the reactor.
I probably have no business asking entering into this discussion since I am neither a chemist nor a physicist, but—
Over the last several months I have been trying to learn the “truth” about the dissociation of the water in my wood chips into Hydrogen and oxygen. I had previously read someplace that it was a pretty simple process. You just heat water to somewhere above 350 degrees C and there you go.
Well, lately I have become quite disconcerted as I have read that there are so many other factors that can be involved, that it’s anybody’s guess as to whether it will happen at all.
Some of the variables:
Presence or absence of carbon and form of that carbon. And, apparently, the availability of carbon from other molecules.
And apparently, the list goes on and on.
So what is an ordinary human with a stratified downdraft gasifier to do to reliably pry enough hydrogen out of the process to make it worth doing?
I guess that I HAD thought that a little moisture was a good thing, since IF we get some hydrogen and some O2 to use to enrichen CO production,
we’d get a higher energy gas. But from what I have been reading. the dissociation doesn’t occur to any substantial degree at temperatures below 2000 C.
(one scholarly paper said " about 1 1/2% of the water molecules will have separated at this temperature")
I know my own gasifier doesnt’ get that hot anywhere, but I don’t think I have ever heard of even a good Imbert design getting that hot.
I do know from my vacuum heat treating backgroung that even Inconel won’t survive at that temp. We considered that Inconel was good in a high vacuum only to about 2150 defrees F.
See why I am confused?
I also commented on the easy and cheap availability of gas sensors to use with and Arduino (automotive guys, cover your ears) and was beat up (politely, but beat up, none the less) for not my comments.
Have any of YOU measured hydreogen?