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snwcmpr

07/22/2019 10:57 PM

Maybe I forgot to add my username to the PP payment.

JackH

07/22/2019 9:24 AM

This reminds me to donate too.

JackH

07/22/2019 9:23 AM

I think it is Ken.

snwcmpr

07/22/2019 2:20 AM

It does not show on the donations list. Is that a manually updated list?

allenb

07/21/2019 12:48 PM

Thanks Ken! Great to have you as an HRO member!

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

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Fluid Bed Chaff Collector
CoffeeInterest	#1 Posted on 02/10/2019 12:18 PM
Newbie Posts: 10 Joined: November 23, 2018	I’m putting the final touches on my 7.5# Fluid-Bed roaster. I did a test run with a basic small Chinese cyclone and it really killed the cfm of my fan (which was also underpowered). The inlet/outlet was only 50mm so i had some pretty crazy adapters in place to get it to connect to the hood. Reduced the cfm too much. So, i’m upgrading the vent fan to 660cfms and hoping to improve the chaff separation. I’m leaning towards a Thien-baffle style due to the shorter size it would afford me. Would this be worth it? Or is a cyclone the only real way to handle chaff on a 7.5# batch? TLDR; Would this work for chaff collection on a 7.5# fluid-bed:


PhilH	#2 Posted on 02/13/2019 3:30 PM
Newbie Posts: 39 Joined: September 10, 2015	Hi You could just give it a try and see what happens - My guess is that there will be too much turbulence and it will blow a fair bit of chaff out of the outlet. If you could insert a rolled sheet metal cone in there and an exit tube up the centre of that you'll get the classic cyclone low pressure point at the bottom where the air reverses direction and the chaff drops to the bottom of the can. The cyclone / chaff collector will create some backpressure which will require a bit more blower power. Depending on what you are using you may be just on the point of considering a 2nd VC blower. 50mm may be a little small and may create too much backpressure. Best to try it with a 2nd VC and see how it works Im using a conical reducer tapering down from 6" to 2-1/2" (70mm) with an elbow inside the drum on my 5kg roaster. You do need reasonably high velocity for the cyclone to work well in spinning out the very lightweight chaff to the cyclone cone some pics attached. I hope this is helpful. regds Phil Edited by PhilH on 02/13/2019 3:56 PM Dalla Corte Mini, Compak K10F, 1.2kg FB LPG/PID FB, 5kg FB LPG/PID


PhilH	#3 Posted on 02/13/2019 3:58 PM
Newbie Posts: 39 Joined: September 10, 2015	ok - trying again with posting the pics you should be able to see elbow in the top of the can and the exhaust tube in the middle in the last pic which is looking up into the cyclone cone PhilH attached the following images: Dalla Corte Mini, Compak K10F, 1.2kg FB LPG/PID FB, 5kg FB LPG/PID


CoffeeInterest	#4 Posted on 02/20/2019 12:24 PM
Newbie Posts: 10 Joined: November 23, 2018	Thank you for the detailed response! I didn't end up giving this a try, and it FAILED. What a mess! I'm going to with a galvanized cyclone now. Not going to mess around with this part of the system any more.

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