[Gasification] Help with Heating Gasifier design (Starting togetconfused)

[Steve Carroll]

Well, I hope I'm not confusing anyone; I'd really be in trouble then.
   
  Downdraft allows for continuous operation without complication.  As for staged combustion, I'm not entirely against it but I don't believe that it would be as efficient or as clean.  Efficiency is the name of the game you know.  At least where I'm coming from.  If you live in a cold climate chances are that the amount of energy you spend on heating is higher than anything else.  If you do a little research on commercially available fuels, you quickly find out that wood is much cheaper than anything else available.  Most commercially available woodstoves are drastically inefficient despite manufacturer claims.  The natural conclusion is that the first order of business should be to find a way to efficiently heat one's home with wood.
   
  Well, thanks for everyone's help.  I think I've got my head on straight now and I can see that I need some slight redesign of drawing 2.
   
  Steve

"Rodenhuis, E.J. (Erik Jan, Student TBK)" <e.j.rodenhuis at student.utwente.nl> wrote:
  Hi Steve,

My opinion is that you shouldn't get confused, or get others confused ;-), simple go back to basics. I agree with Jeff. You want a heat application on wood? 
Why not try an updraught design or staged combustion system, with an air inlet at the bottom? 

With concern to air inlets: you need oxygen for combustion and the air inlet should be there where you want combustion to occur. You will need a fan for in blow of air in the combustion zone to get the gasifier started. Also you need a secondary air in blow in the furnace. 

Erik Jan


-----Oorspronkelijk bericht-----
Van: gasification-bounces at listserv.repp.org [mailto:gasification-bounces at listserv.repp.org] Namens Steve Carroll
Verzonden: woensdag 16 augustus 2006 15:09
Aan: gasification at listserv.repp.org
Onderwerp: Re: [Gasification] Help with Heating Gasifier design (Starting togetconfused)

Jeff,

Yes, this is a close-coupled gasifier. I suppose I could just as easily pipe the gas somewhere else and burn it but most of the tars would probably condense in the pipe. I guess the line between a gasification-burning process and simple combustion can be pretty thin but I think that gasification is still a cleaner and more efficient process.

I think that what I am trying to figure out is: is it possible to put either the primary or secondary air stream in the charcoal bed and still have a layer of charcoal above it to do the co and h2 conversions. Also, would the oxygen through the charcoal bed just burn the charcoal off too fast.

Is this a better question to ask in the stoves list? I kind of assumed that they would only be discussing small campstoves over there.

Thanks,
Steve

Jeff Davis wrote:
Hi Steve,

On Tuesday 15 August 2006 09:55 am, Steve Carroll wrote:
>> The
> > goal for this process is to create as much heat as possible and to burn
> > all of the wood, charcoal, tar, and gas before leaving the gasifier.

So in other words, you just want to burn wood cleanly and do not need a 
gasifier? A close-coupled (not sure of spelling) burner/gasifier would add 
air after it made the gas. Someone correct me if I am wrong.


Jeff


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