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Build a Chaff Collector Cyclone
Lawnmowerman
Hi this is Ben. I recently cobbled together a smaller version cyclone. It is used on a heat gun bread machine roaster, and is passive, because the heatgun provides plenty of pressure to make it work just well enough to catch the small amount that isn't kept in the initial chaff accumulation area. I didn't use a cone. This is all part of a new roaster build, and will be in its own thread. It is nearly complete.
Bad coffee prevails when good coffee roasters stand by and do nothing.
 
Turingalad
Lawnmowerman, can't wait to see pics! Do you happen to have a sneak-peak of the chaff-collector? or sketch or something?

I've got a real math-y question... if I know the diameter of intake pipe, and measurements of cylinder/cyclone, how do I measure the hole that the pipe goes into (like these pictures I found...) so I cut it accurately? (The material I could hypothetically use would be able to be flat for cutting purposes, prior to molding it into the cyclone shape, or cylinder.)

i867.photobucket.com/albums/ab233/jules42651/dc/dc_inlet_01.jpg

i867.photobucket.com/albums/ab233/jules42651/dc/dc_inlet_02.jpg
 
bud
sweet, love the build.


bud

smoking
"the beer was very cold and wonderful to drink"

brew with old perc
 
Lawnmowerman
I will post pics today. The piece you are showing(i call it a diverter), I took from a vacuum cleaner canister. I just mounted it sideways.
Bad coffee prevails when good coffee roasters stand by and do nothing.
 
Lawnmowerman
I used a 6 inch canister with a cookie tin style lid. The bread maker roaster captures most of the chaff because of its design. The cylone has a lower half which is just the canister and the diverter. The "cone" and chimney adapter are divided on opposite sides of the lid. There is a connection hose to the cooler so it blows smoke right out the same chimney, and not into my garage.The chimney adapter is an enchilada sauce can (because I can't help it). I threw this together in about a half hour. I admit it's rough. But it works perfectly. With no output fan necessary. Hope I didn't forget anything. Ben.
Lawnmowerman attached the following images:
20150531_113234-1.jpg 20150531_113234-2.jpg 20150531_113707-1.jpg 20150531_113827-1.jpg 20150531_115143-1.jpg 20150531_115315-1.jpg

Bad coffee prevails when good coffee roasters stand by and do nothing.
 
LongLeafSoaps
allenb wrote:

You don't waste any time. I would have had to ponder the thing for at least a month before getting off the rear end.

From what I've read in the DIY cyclone world your inlet arrangement (centered instead of tangential) would cause some chaff to get sucked into the paint can and into your shop vac.

Any sign of chaff inside your shop vac?

I know the 1 lb San Franciscan table top roaster has the inlet centered but I think it has a sheet metal vane inside diverting the air into a centrifugal vortex around the drum. This is a guess only.

Allen


Hi, new here & my 1st post...

I know this is an old thread, but my thought would be rather than to cut an elongated hole and have to fuss with filling in w/caulk or something to direct the PVC inlet pipe to the sidewall of the bucket, is to go ahead and place the inlet hole square into the side of the bucket for your PVC pipe (like shown above in seedlings post), and on the inside of the bucket just use a 90 degree elbow to direct the air & chaff around the bucket wall instead of towards the paint can outlet pipe (or whatever you choose to use for the air outlet pipe)....
Edited by LongLeafSoaps on 08-22-2015 04:48
 
ChicagoJohn
LongLeafSoaps wrote:

use a 90 degree elbow to direct the air & chaff around the bucket wall instead of towards the paint can outlet pipe (or whatever you choose to use for the air outlet pipe)....


Sounds like a good idea, LongLeafSoaps, for all the reasons you mentioned as far as fabrication and also because the right angle turn will help to reduce the velocity initially as well as to direct the flow against the outer wall where drag will further reduce it. The problem with bean chaff is that its high aspect ratio in combination with low mass gives it a very low settling rate compared to particulates like saw dust.
So many beans; so little time....
 
LongLeafSoaps
ChicagoJohn wrote:

The problem with bean chaff is that its high aspect ratio in combination with low mass gives it a very low settling rate compared to particulates like saw dust.


Sawdust definitely weighs more than chaff...popcorn hulls weighs more than chaff!

Oh, and hey...I used to live in Hazelcrest, Ill. I could look down the street and see Sears Tower when I would get my mail! Miss Chicago except for the traffic!=D
Edited by LongLeafSoaps on 08-25-2015 01:48
 
oldgearhead
Oh I went through several hoops trying to integrate a baffle-separator
(used in industry to collect red-dog) into my one-pound, electric, fluid-bed roaster. The best I was able to do was 80%. Therefore, I just put a 40=mesh screen over the RC and after cooling vacuum the chaff off the top of the beans..very simple, and more effective...try it..
No oil on my beans...
 
JETROASTER
I hope this link is helpful. It's a bit dry, but some good info to be had.
My take away; Inlet geometry matters. Tall inlets are better than wide inlets. Angle of inlet is also significant.
Cheers, Scott
http://www.scienc...4X10004178
 
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Ringo
With a cyclone you are spinning the air centrifugal force holds the dust to the outside wall, the air that goes up the center should be clean. When you need to remove very fine dust you make a smaller diameter cyclone but use more that one. So the air spins faster. Coffee chaff is easy to remove if you come in at a tangent so the air spins. I have multiclones on a boiler at work that removes 5 micron particulate, but each one is only 8 inches across. Each multiclone has maybe 40 tubes in it. The one I built for my roaster is maybe 18 inch straight diameter pipe with no funnel at the bottom. The chaff just falls to the bottom every couple weeks I open an access door and clean it out. I have seen commercial roasters that use this same system.
All you need in life is ignorance and confidence, and then success is sure. Mark Twain
 
alexcampbell
I am building a cyclone for my new roaster, but I think this is overthought sometimes. I have been using this setup for 2 years where it just dumps from my poppery into a bucket. No chaff escapes this setup as the velocity of the air is dropped so low. I used to put a towel over the bucket, but found it unnecessary.

farm6.staticflickr.com/5621/21008413039_b2417eac35_c.jpgCurrent Chaff Collection
 
renatoa
Looking at commercial roasters cyclones, even for the smallest machines, under 1 kg, they look too big for me...
Is there any design criteria for a cyclone, can we speak about a rating, or capacity, derived from the airflow and/or machine capacity ?

Asking because I found an incredible cute and cheapo cyclone, full cast aluminium, but looks like a toy near a commercial unit... 25 mm admission and exhaust holes, size of a beer bottle, what do you think ?
It is rated for 45-70 cubic meters per hour, though... typical airflow for 1 kg commercial roaster.
Edited by renatoa on 01-13-2018 23:22
 
dmccallum
I based my cyclone on a thien principal.
https://forum.hom...owstart=80

In the course of designing it I could help but notice that it's dimensions corresponded to the first stage on our regular dyson vac.

I also noticed that it scaled smaller than this in the Dyson cordless vacume which I also have. It's first stage is also a thien which should serve for coffee roasting.

The Dyson handlheld vac above pulls 160 CFM through this small thien cyclone. Should be easy to develop something from a short length of 130mm stainless tube.
dmccallum attached the following image:
dyson-cyclone.jpg

Edited by dmccallum on 02-02-2018 00:53
 
dmccallum
renatoa wrote:
Asking because I found an incredible cute and cheapo cyclone, full cast aluminium, but looks like a toy near a commercial unit... 25 mm admission and exhaust holes, size of a beer bottle, what do you think ?
It is rated for 45-70 cubic meters per hour, though... typical airflow for 1 kg commercial roaster.


Refer this link here. In particular Allenb's comment about his 1lb drum roaster draw
https://forum.hom...rowstart=0

Refer also http://www.tradit...inute.html

Your suggested 45-70 cubic meters per hour correlates to the cfm rates Allen was talking about.
 
renatoa
Ok, the mini cyclone arrived meanwhile, it is incredible how they can made this full cast Aluminium piece and sell for less than 10 GBP shipped from China to EU...

You can see it attached to my current TO oven in the picture below.
To have a better sense of the size, total height is 19 cm, diameter is 8 cm and pipe(s) diameter are 25 ID / 29 OD (mm).

Not tested yet, next roast soon.

OK, airflow match with Chinese specifications, does it really means is good for 1 kg roaster ? <confused>
Then why commercial roasters cyclones are SO big ?

Source: eBay or Aliexpress. search: "Aluminium Cyclone extractor"
.
renatoa attached the following image:
dsc06684.jpg

Edited by renatoa on 02-02-2018 02:12
 
dmccallum
renatoa wrote:
Source: eBay or Aliexpress. search: "Aluminium Cyclone extractor"
.


Ahh, the Dust Commander. It's been around a while but had only seen it in plastic.
Great find and look forward to hearing how you get on with it.

Are you aware this thing is just the cyclone - not the complete sealed assembly? You'll have to mount the thing into a bin of some sort which is sealed to receive the chaff. Sorry if I'm stating the obvious.
dmccallum attached the following images:
cyc2.jpg cyc1.jpg

Edited by dmccallum on 02-02-2018 03:56
 
renatoa
Is a tin can from whatever food or paint recipient ok ?
Thinking to cut an 8 cm circle in the lid, mount the cyclone in that hole with silicone sealant, anything else needed ?
 
dmccallum
renatoa wrote:

Is a tin can from whatever food or paint recipient ok ?
Thinking to cut an 8 cm circle in the lid, mount the cyclone in that hole with silicone sealant, anything else needed ?


Probably. It just needs to form a seal and be able to withstand the suction you're going to apply to it so it doesn't collapse (which is unlikely).
 
greencardigan
Awesome! It does look undersized for a 1kg air roaster, but could be just right for a lower airflow roaster.
 
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