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mistertom
10-30-2012, 01:46 PM
Hello all, I recently completed a smoke generator made from 4" square tube. It is a low outlet style. It seems to work very well, but the gravity feed is not working very well.
I am using maple which I have run through my chipper/ shredder. I am thinking that perhaps the chips are too stringy and light and are binding together.

Has anyone else experienced this and found a simple solution?

I really would like to continue to make my own chips.

mistertom
10-30-2012, 02:05 PM
The consistency of the chips I am using.http://members.shaw.ca/mistertom/IMG245.jpg

mistertom
10-30-2012, 02:08 PM
The prototype model.
http://members.shaw.ca/mistertom/IMG253.jpg
http://members.shaw.ca/mistertom/IMG246.jpg

mistertom
10-30-2012, 02:12 PM
The bottom of the firebox slants downward to the air inlet to allow ash to fall out (hopefully)! The bottom is made from steel angle inclined at 30 degrees.
http://members.shaw.ca/mistertom/IMG252.jpg
http://members.shaw.ca/mistertom/IMG248.jpg

mistertom
10-30-2012, 02:14 PM
Fill port:
http://members.shaw.ca/mistertom/IMG250.jpghttp://members.shaw.ca/mistertom/IMG251.jpg

mistertom
10-30-2012, 02:20 PM
Although you cannot see it, the smoke outlet pipe protrudes very little into the box and is cut away on the bottom side. The chips in the photo are still wet, but I did oven dry some to test it. It lights with a match in seconds, smokes very well, however it only smokes for a few minutes before the fuel at the bottom is exhausted and the fire stops.
I will try a weight on top of the chips, but think that might cause them to jam up more.
Any suggestions?

deguerre
10-30-2012, 02:27 PM
I'm thinking pellets would be your best bet in that device.

Dr_KY
10-30-2012, 02:57 PM
I would reverse it and blow the air through the top with a venturi effect this will also help to draft the burning up the fuel load.

mistertom
10-30-2012, 03:28 PM
I'm thinking pellets would be your best bet in that device.

You are probably right. I have always cut my own smoking wood, so that is a hard step for me!

mistertom
10-30-2012, 03:32 PM
I would reverse it and blow the air through the top with a venturi effect this will also help to draft the burning up the fuel load.

You are suggesting putting the smoke pipe/ venturi at the top of the hopper? Essentially the smoke would travel through the chips as well as the burn being able to move towards the top as well. correct?

When looking at others I noticed both styles. I can always build another to try it out.

Dr_KY
10-30-2012, 03:55 PM
Exactly.

SmokerKing
10-30-2012, 07:49 PM
I built several a year or two back, pellets work the best in mine;

http://imageshack.us/a/img19/4809/smokepak2.jpg

http://imageshack.us/a/img406/9586/smokepakinside.jpg

http://imageshack.us/a/img8/6263/smoke2m.jpg

mistertom
10-31-2012, 01:11 AM
That is nice looking! I will have to get some pellets to try.

mbshop
10-31-2012, 01:20 AM
i'm a bit confused by yer design. but the chips you are using are to long thus allowing them to jam against the sidewall of the smoker. just make the chips or shredded pices not as long and it should be ok.
here is some basic designs,
http://www.wedlinydomowe.com/smokehouse-plans/smokehouse-smoke-generator

woodpelletsmoker
10-31-2012, 01:42 AM
I am doing smoke/grill by gravity feed burner.
I know what I am saying
COLD smoker can not use gravity feed.
Only if you burn fuel in flame, you burn fuel to ash and ash drops down through grate.
But if fuel burns in flame, it is not COLD smoking.
Also your fuel will form Bridge Blocking, gravity feed does not work on your chips.
There is a very simple method to make your smoke generator workable

mistertom
10-31-2012, 12:09 PM
i'm a bit confused by yer design. but the chips you are using are to long thus allowing them to jam against the sidewall of the smoker. just make the chips or shredded pices not as long and it should be ok.
here is some basic designs,
http://www.wedlinydomowe.com/smokehouse-plans/smokehouse-smoke-generator
Which part is confusing? I think if I only use the chipper instead of the shredder the chips will be more uniform and smaller.

mistertom
10-31-2012, 12:14 PM
i'm a bit confused by yer design. but the chips you are using are to long thus allowing them to jam against the sidewall of the smoker. just make the chips or shredded pices not as long and it should be ok.
here is some basic designs,
http://www.wedlinydomowe.com/smokehouse-plans/smokehouse-smoke-generator


I did look at that information prior to making it. That is mainly where I got the idea from. It is essentially the low nozzle smoke generator design with the addition of the slanted bottom. I had the idea that the slanted floor would allow the ash to fall out. That remains to be seen! Thanks for taking the time to help me out!

mistertom
10-31-2012, 12:18 PM
There is a very simple method to make your smoke generator workable

Thank you for your input. Could you elaborate on the method please?

Q Junkie
10-31-2012, 01:23 PM
I also think you may want to delete the 90 deg elbow and direct your air flow straight through the tee into the smoker causing a venturi effect.
Or perhaps I am looking at this wrong.

Q Junkie
10-31-2012, 01:27 PM
I just looked at it again and I think you just need to reposition the tee so that is perpendicular to the generator and inject air straight though the tee and lose the 90

mistertom
10-31-2012, 03:14 PM
I also think you may want to delete the 90 deg elbow and direct your air flow straight through the tee into the smoker causing a venturi effect.
Or perhaps I am looking at this wrong.

I was not planning on using the elbow at all. I needed to get another nipple after the T, but all I had on-hand for my test was the 90. The venturi still worked. There was a noticeable difference with the air pump off, however the elbow would certainly present resistance to flow.

Sorry it looks misleading. I just needed something to pass the the blowpipe to make the venturi work.

mistertom
11-01-2012, 11:37 PM
I tried with pellets and it seemed to smoke for a couple of hours without any trouble before I closed the air vent. Thanks!

Dr_KY
11-02-2012, 04:29 AM
Sweet! I have had great runs (gravity fed and air through the top) with pellets and chips but found that mixing in dust causes it to need a tap every now and then.

mistertom
11-04-2012, 11:20 AM
I think that I will move the venturi/ smoke outlet to the top for sure. It still seems to get a cemented mass of char just above above the outlet. In all of my previous hot smokers my wood (maple) has burned completely to a white ash. I was hoping to use this for cold smoke only. Without an external source of heat/combustion it seems that the pellets only char and do not burn completely.

Dr KY, was that your experience? Or do your pellets combust completely?

Mo-Dave
11-04-2012, 11:58 AM
For a better pellet burn I suggest raising the flame above the intake with some kind of screen, and make sure you have room for ash to fall below that level. I also like the air being blown from the top into the cooker with the air pump. 86 the wood chips, just to ruff for what you are doing. In order to keep ash from blocking airflow you may need to give the side a rap or two now and then, to let ash drop away. Also suggest not filling it to much and adding if need be.
Dave

woodpelletsmoker
11-04-2012, 05:48 PM
Thank you for your input. Could you elaborate on the method please?
Find a small tube, say 2" in diameter, drill holes in the tube.
Insert the perforated tube inside the center of chips.
Positive blow from bottom.
light chips on top.

mistertom
11-04-2012, 10:13 PM
Find a small tube, say 2" in diameter, drill holes in the tube.
Insert the perforated tube inside the center of chips.
Positive blow from bottom.
light chips on top.

That is a very interesting idea. With this method do you place your outlet at the top or bottom of the hopper?

woodpelletsmoker
11-04-2012, 10:45 PM
That is a very interesting idea. With this method do you place your outlet at the top or bottom of the hopper?
Blow from bottom. Outlet must be on top

Dr_KY
11-05-2012, 02:58 AM
I think that I will move the venturi/ smoke outlet to the top for sure. It still seems to get a cemented mass of char just above above the outlet. In all of my previous hot smokers my wood (maple) has burned completely to a white ash. I was hoping to use this for cold smoke only. Without an external source of heat/combustion it seems that the pellets only char and do not burn completely.

Dr KY, was that your experience? Or do your pellets combust completely?

I agree with Mo-Dave and do much the same. I ran a mixture of pellets and chips and do tend to get a bit of resin inside only if the air is at too high a pressure. Haven't had any problems with bridging or masses though. I truly believe that blowing from the top works out best and keeps the design simple. In the past I did the bottom thing but had more issues.

mistertom
11-07-2012, 03:01 PM
Thanks to all for the input. I now have some proven ideas to work with. I appreciate it!