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Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Fluidbed Roaster

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Freshbeans Air-Roaster
JETROASTER	#1 Posted on 05/02/2010 7:51 PM
Administrator Posts: 1780 Joined: March 06, 2010	So, this is the workhorse. 5 lbs. French Roast in 8 minutes. Lighter roasts can go quicker, but I prefer them at about 7 minutes. It's not real pretty, but it has been in service for over 8 years. Black iron pipe(2") , stripped ductwork, (acid bath, abrasive wheel) The current RC is about 2 weeks from retirement, being replaced by a 7.5-10 lb stainless version. It will remain a pump-n-dump. I will likely re-incorporate a sight-glass again. I am currently building a smaller machine that will be considerably sleeker, using a different design concept. All stainless. In the photo; #1 air from blower (http://www.ametek...rd_ID=6542) #2 fuel control, #3 primary combustion air control,#4 ignitor,#5(pre-combustion) air pressure dump,#6 combustion,#7 burner Temp, #8 Lower RC T, #9 contact T,#10 bean T,#11 exhaust T. Fuel source; 2, twenty lb. LPG, tied together with a regulator, normally running at 35-40 lbs pressure.(this arrangement reduces tank freeze) Incoming air pressure gets split into primary combustion air, and secondary combustion and dilution air. Not in the photo; Just above the exhaust temp it transitions to 3", onward to chaff collector, transition to 4" out of chaff collector, pushes straight up 25' out of building. ....one blower only. .....Have Fun, Scott Edited by seedlings on 05/03/2010 7:50 AM


JETROASTER	#2 Posted on 05/02/2010 7:56 PM
Administrator Posts: 1780 Joined: March 06, 2010	Hoping for the photo..... JETROASTER attached the following image:


Unta	#3 Posted on 05/02/2010 8:45 PM
1 1/2 Pounder Posts: 788 Joined: January 26, 2010	killer.. I need some more heat/blower specs and some more detail info on the black iron air arrangement..Ahhhhh...It reminds me of home.. . :) Sean Harrington educate.
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John Despres	#4 Posted on 05/03/2010 6:57 AM
Administrator Posts: 2221 Joined: January 09, 2008	Wow! Wow! That's about all I can say. Very cool, Scott John! Respect the bean. John Despres Fresh Roast 8, Gene Cafe, JYTT 1k, Quest M3, Mazzer Mini, Technivorm, various size presses and many more brewers.
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seedlings	#5 Posted on 05/03/2010 7:54 AM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	Modern art. Thanks for posting, Scott! Do you use a prefabricated burner, or one of your creation? CHAD Roaster: CoffeeAir II 2# DIY air roaster Grinder: Vintage Grindmaster 500 Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover


JETROASTER	#6 Posted on 05/03/2010 8:48 AM
Administrator Posts: 1780 Joined: March 06, 2010	As art goes, this is probably brutalism. I am shooting for 'mechanical sculpture' with the next machines. The next machines are coming together alot more refined. I just started building again when I joined the forum. Finding time is always the issue. The burner is created, and is the other issue. It doesn't appear that the industry has not done it. Maybe they don't care, maybe they don't like or need it. Whatever the case... The insidious plan is to complete the drawings, file the provisional , recruit roasternauts. Build multiple machines by multiple roasternauts at the same time...and blog it...right here. We could have alot of fun, but I certainly don't want the industry taking a free ride. I am keenly aware that I need medication, but that's my plan anyway. Scott


seedlings	#7 Posted on 05/03/2010 8:57 AM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	Oh! How a bout a pic of the chaff collector because I want one in my build. In 8 years have you figured how much fuel it takes per pound or per batch? CHAD Roaster: CoffeeAir II 2# DIY air roaster Grinder: Vintage Grindmaster 500 Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover


JETROASTER	#8 Posted on 05/03/2010 9:29 AM
Administrator Posts: 1780 Joined: March 06, 2010	Fuel; 40lbs LPG = 450 lbs coffee (summer) 415 lbs(winter) Currently refining combustion a bit, and refining bean circulation. I feel squeezing another 25% efficiency is reachable. Chaff; Nothing artistic there. Inverted waste basket inside another trash can. 5" water bath. Setting one building on fire was enough. The water bath is messy but, no more fires!! Scott


JETROASTER	#9 Posted on 05/03/2010 2:12 PM
Administrator Posts: 1780 Joined: March 06, 2010	Chaff collector. A special brand of ugly. Inside is an inverted can. The outer can only holds the water. Secure the inner can downward, ( to fight the exhaust pressure ) ...presto, the chaff is no longer a viable fuel. Hope it's helpful Scott JETROASTER attached the following image:


bvwelch	#10 Posted on 05/03/2010 4:09 PM
1 1/2 Pounder Posts: 1064 Joined: December 27, 2007	I don't understand it (chaff collector) but I love it anyway! :Clap:


allenb	#11 Posted on 05/03/2010 8:25 PM
Administrator Posts: 3858 Joined: February 23, 2010	Scott, I'd like to take a stab at how you have this arranged. The discharge (exhaust) duct from the roaster goes down through the upper end of the inverted smaller bucket and extends down into the water a couple of inches. The second duct takes the water-filtered exhaust minus chaff from the upper end of the inverted bucket then on to the outdoors? Sort of like the water pipes from some folks younger rebellious days. Let me know if I win a prize! Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


JETROASTER	#12 Posted on 05/03/2010 11:14 PM
Administrator Posts: 1780 Joined: March 06, 2010	Allen You are the grand prize winner!!!!....almost... Exhaust enters off-center, 90 degree turn(inside) to create cyclonic. Chaff falls into water bath. Exhaust exits on center, up and out. Quickly built, effective, shameful in photos. Scott


allenb	#13 Posted on 05/04/2010 2:25 PM
Administrator Posts: 3858 Joined: February 23, 2010	Darn! I thought I had scored 100%. Oh well... They call that "crude but effective" and nothing wrong with that other than sometimes feeling a little self concious when showing the world. Great design concept! Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana


seedlings	#14 Posted on 05/05/2010 11:01 AM
1 1/2 Pounder Posts: 4226 Joined: June 27, 2007	The inner bucket touches the water? Like this? CHAD seedlings attached the following image: Roaster: CoffeeAir II 2# DIY air roaster Grinder: Vintage Grindmaster 500 Brewers: Vintage Cory DCU DCL, Aeropress, Press, Osaka Titanium pourover


JETROASTER	#15 Posted on 05/05/2010 11:25 AM
Administrator Posts: 1780 Joined: March 06, 2010	Hi Chad I think we have a winner! ...Inner bucket touches the floor of the outer bucket(small gap). Center pipe is flush with ceiling of inner bucket. The real flaw is that the large surface area of the water is being pressed by the exhaust. Holding the inner tank down requires more effort. By reducing the exposed surface, this could be remedied. Scott JETROASTER attached the following image:


Koffee Kosmo	#16 Posted on 05/05/2010 9:51 PM
Administrator Posts: 1620 Joined: December 31, 2008	Would it be fee-sable to extend the exhaust pipe into the water to work like a Hookah without the top section KK I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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Ringo	#17 Posted on 05/06/2010 7:19 AM
Pounder Posts: 474 Joined: January 14, 2010	I think it would work but for a commercial roaster when you capture stuff in water EPA calls that a hazardout waste, could get tricky with disposal.


JETROASTER	#18 Posted on 05/06/2010 8:26 AM
Administrator Posts: 1780 Joined: March 06, 2010	I'm certain the hookah technology would work...A little more resulting back-pressure maybe. Even discharging close to the water surface would likely work as well. Disposal: Evaporation trough, then goes into the mulch pile as a dry chaff biscuit.


dja	#19 Posted on 12/03/2010 10:37 AM
1 1/2 Pounder Posts: 701 Joined: November 07, 2008	forget the water bath, use a cyclonic seperator with a water spray covering the outlet, you water is always moving them so its constanly washing the wet chaff down the drain, kinda like that commercial you wonder where the yellow went. large capacity roaster,,,18" dia X maybe 48 tall David I pour Iron and roast Coffee Beans If life seems normal your not going fast enough Mario Andrette


JETROASTER	#20 Posted on 12/03/2010 12:32 PM
Administrator Posts: 1780 Joined: March 06, 2010	Sometimes I think I'd be wiser to build a nicer seperator that empties easy. I am sooo over the water. But the fire protection is nice. It's ugly ,but it works, So that project keeps winding up lower on the list. I'm really more interested in building a nice 1lb roaster. Let's face it, roasters are more fun than chaff collectors. -Scott


dja	#21 Posted on 12/03/2010 5:09 PM
1 1/2 Pounder Posts: 701 Joined: November 07, 2008	yep so back to the 1pounder. I pour Iron and roast Coffee Beans If life seems normal your not going fast enough Mario Andrette


JETROASTER	#22 Posted on 04/27/2011 1:59 PM
Administrator Posts: 1780 Joined: March 06, 2010	Although painfully slow, I've been making a new RC for the 5lb machine ....Using a little mixing bowl technology. I put Max in the frame for scale. The question ; If I reshape the flame and force the tip up into the RC, would that likely create any of the characteristics of a direct -flame roaster? There are some obvious hazards involved....but just thinking out loud. -Scott JETROASTER attached the following image:


JETROASTER	#23 Posted on 12/07/2011 12:35 PM
Administrator Posts: 1780 Joined: March 06, 2010	A little video before the rebuild. Some of these components are going away soon, in favor of things more functional or simply more attractive. The combustion liner will be changed in an effort to spread out the center of the flame. The casing will get changed out....because it's ugly... and the RC because it's extremely ugly. It will also become a bit larger....I've got plenty of heat. I can't afford any down-time for this machine, so once I have my parts, it will get taken apart and redone quickly. I will shoot video of that, David (dja) has an interest in taking a stab at it. For now, this is all I've got. A little something to hold Davids interest. "pilot light" hmph! -Scott [video]http://www.youtube.com/watch?v=ZyvwYpBx2NY[/video]


Koffee Kosmo	#24 Posted on 12/09/2011 4:29 AM
Administrator Posts: 1620 Joined: December 31, 2008	I am captivated by the blue flame Went to a happy daydream place when I once worked in the steel yard KK I home roast and I like it. Designer of the KKTO Roaster Build information https://homeroast...ad_id=1142 https://docs.goog...lide=id.i0 Blog - http://koffeekosm...gspot.com/ Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex, (KKTO) Turbo Oven Home Roaster.
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allenb	#25 Posted on 12/09/2011 5:35 PM
Administrator Posts: 3858 Joined: February 23, 2010	Put me in the interested list on seeing the combustion chamber casing re-do. This is a one-of-a-kind burner setup that I will also want to take a stab at down the road when I try my hand at building a bubblebed. Allen 1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana

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