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Author Topic: Biggest concerns for Gasification boiler build  (Read 12305 times)

binfordw

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Re: Biggest concerns for Gasification boiler build
« Reply #15 on: January 24, 2014, 08:55:12 AM »

I wondered when you said you based yours off a P&M 250, if you did the extra runs of heat exchanger tubes- front to back.  I have been doodling mine up in CAD, with just the rear upright tubes so far.  Having the 2 extra sets front to back would add a good bit more labor, parts, and more stuff to clean.  Do you feel its worth having in the end?
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mlappin

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Re: Biggest concerns for Gasification boiler build
« Reply #16 on: January 24, 2014, 10:55:54 AM »

I would think the more heat exchanger area the better, in this day of making it cheaper and charging more, if P&M thought they could do away with those tubes and not effect efficiency they would have already.
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binfordw

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Re: Biggest concerns for Gasification boiler build
« Reply #17 on: January 24, 2014, 12:28:20 PM »

Can anyone elaborate on the importance of proper heat exchanger size? 
. Mine has six 2" tubes off of the secondary chamber about 30" long and ten 2" tubes travelling horizontally 36" back to front and then 10 more front to back then exits out 6" stack.

All of your heat exchange tubes are 2"?

Is the goal to allow more volume in the heat exchange tubes the farther away from the secondary chamber you get?  Or is it also possible to use the same area of tube from the secondary chamber all the way to the exit stack with no ill effects?
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binfordw

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Re: Biggest concerns for Gasification boiler build
« Reply #18 on: January 24, 2014, 12:50:20 PM »

Sorry- I have quite a few questions I'm currently needing to solve!

Firebrick- I need to settle on a type early on so I can dimension the secondary chamber off of the brick sizes, Anyone have a specific type to look into- or a website that offers them?
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renoman

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Re: Biggest concerns for Gasification boiler build
« Reply #19 on: January 24, 2014, 05:54:28 PM »

yes all tubes are 2"
I would definitely do all the runs in fact maybe even a few more. I think the goal is to have the surface area to dissipate the heat in to the water. Given my stack temps are 240 I think it is pretty close but once they r a bit dirty it could be an advantage to have a few more runs to keep the efficiency up.
I purchased my bricks and high heat mortar from patene building supplies her in Ontario. Not sure on the grade of the firebrick but so far no sign of any deterioration. I believe they were 2" x 4" x 9" and around $3 a piece but in would have to check on that to be sure.
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renoman

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Re: Biggest concerns for Gasification boiler build
« Reply #20 on: January 24, 2014, 06:01:29 PM »

Think there may be something to not making the secondary chamber too big as well. think you want to keep that brick fairly close to that flame so it retains high temps that r produced there to keep the gasification happening quickly on the call for heat. to large of an area may cause reduced temps and sluggish start up of gasification. Not sure just a theory on my part. You may want to research what others are using for sizing on their secondarys.
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binfordw

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Re: Biggest concerns for Gasification boiler build
« Reply #21 on: January 24, 2014, 07:02:04 PM »

So your tube volume steps up, 6 2" tubes to 10 2" tubes.  My current drawing uses six 3" tubes.  If/when I add a front/back run, I will probably use a smaller tube, but add quantity to have a bit higher internal surface area than the six 3" tubes.

Good to hear you have had good luck using what sounds to be pretty standard firebrick.  I have looked briefly, but have not seen a lot of variety commonly sold to the public.
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binfordw

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Re: Biggest concerns for Gasification boiler build
« Reply #22 on: January 24, 2014, 10:10:50 PM »

I slapped some quick skins on my current drawing, just so it made a little more sense.  I will probably make lots of changes as I go, but this is the main plan so far.

The orange 8" is my bypass tube.  I need to add a shutoff in the final chamber for it, which will probably require enlarging the final chamber to fit the mechanism.


If I can get this all drawn up right, the good part is I have a cnc plasma table at home, so cutting the parts and assembly should be pretty easy.





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mlappin

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Re: Biggest concerns for Gasification boiler build
« Reply #23 on: January 24, 2014, 11:16:17 PM »




If I can get this all drawn up right, the good part is I have a cnc plasma table at home, so cutting the parts and assembly should be pretty easy.



Will you be my new best friend? Or if you prefer you could just adopt me.
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Stihl 023
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Homemade skid steer mounted splitter, 30" throat, 5" cylinder
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renoman

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Re: Biggest concerns for Gasification boiler build
« Reply #24 on: January 24, 2014, 11:27:25 PM »

lookin good so far binford. thinking you may want to raise or spread that heat exchange a bit so u can
access those vertical tubes a little easier for brushing them out.
Any ideas on your airbox and air feeds for the primary and secondary?
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binfordw

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Re: Biggest concerns for Gasification boiler build
« Reply #25 on: January 25, 2014, 12:12:10 AM »




If I can get this all drawn up right, the good part is I have a cnc plasma table at home, so cutting the parts and assembly should be pretty easy.



Will you be my new best friend? Or if you prefer you could just adopt me.

I'd be happy to, but I'll take a stab at it and say you don't live anywhere near Indiana! 


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binfordw

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Re: Biggest concerns for Gasification boiler build
« Reply #26 on: January 25, 2014, 12:19:16 AM »

lookin good so far binford. thinking you may want to raise or spread that heat exchange a bit so u can
access those vertical tubes a little easier for brushing them out.
Any ideas on your airbox and air feeds for the primary and secondary?

I will have to raise the "lid" on the final pass exchange tubes anyway I think, to allow room for the bypass close-off mechanism- that will add a little extra room. The tubes will be a straight shot, with door access at both ends for cleaning.

As far as air, not yet.  Hopefully that should be pretty easy, small box with fan mount and block off "damper" mechanism, and tube running to topside of primary burn box, and one into secondary.  Although I'm not real certain where to put the air in the secondary, I will need to look that up. 

You guys have been great help so far, I'm really starting to get excited about this build now.
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mlappin

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Re: Biggest concerns for Gasification boiler build
« Reply #27 on: January 25, 2014, 06:03:27 AM »




If I can get this all drawn up right, the good part is I have a cnc plasma table at home, so cutting the parts and assembly should be pretty easy.



Will you be my new best friend? Or if you prefer you could just adopt me.

I'd be happy to, but I'll take a stab at it and say you don't live anywhere near Indiana!

Bet I do, North Liberty Indiana to be exact.

Was cold enough yesterday the straight truck tried to gel up twice yesterday delivering hay, also had the loader tractor try to gel up as well.
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Stihl 023
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binfordw

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Re: Biggest concerns for Gasification boiler build
« Reply #28 on: January 25, 2014, 09:58:24 AM »

Ah just barely Indiana by the looks of it!  I'm about 4 hours south in Greensburg.  It has been cold here for sure.  We have some decent snow/drifting today, but the temps are warmer, seems like high 20's.
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renoman

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Re: Biggest concerns for Gasification boiler build
« Reply #29 on: January 26, 2014, 09:50:00 PM »

Some pics of my build:
 
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