Dear Mr. Alvarez,

Dryer air carrying dried products in a humid atmosphere is universally

collected in bag filters without problems. The most important parameter

is the outlet temperature of the dryer compared to the dewpoint of the

humid process air. With fluid beds the air quantity compared to the moisture

content usually means that the dewpoint is far below the filter bag ambient.

Care should be taken if hot air is to partly recirculated to save energy

which can lead to a closer differential between baghouse ambient and

dewpoint.

We, Atritor, like to keep outlet temperatures at least 10C/18F above

dewpoint.

Hope this is of help.

Best regards,

George Milburn

gmilburn@atritor.com ■

Hello from Ibis International, Inc.

We cannot help with this application. However, you may consider an automatic roll filter depending on the air volume (m3/Hr). The other possibilityis a wet scrubber.

Good Luck,

Ibis, Inc. USA

sales@ibis-usa.com ■

I globally agree to R.Wolbier's answer, but the limit is, to my opinion, more drastic than the dew-point (which is air saturation temp). The limit temperature is such as air relative humidity should be equal (or inferior to) to water activity in the dry product, for example 50% (instead of 100%), which is not a real difficulty. You may use the water sorption isotherms of your product.

For this, it should be sufficient to maintain the air temperature in the filter, which means you may have to heat the filter walls (or at least, to have good insulation), in order to keep air over this limit (which may be far over the dew point).

Besides, if you use pressurized air to clean the filter cyclically by counter current flow, it is a cause of air refreshing, and product moisturizing. So, you must heat this air too, or use another way of cleaning the bag (mechanical shakers, ...).

Good luck. JV

PS : best regards to Dr Wohlbier, who sent the message ■

Please direct your contact for fabric filters to Bob Pirrmann at 770

693-2135 or rpirrmann@amerexind.com

For the type of bag fabric, I suggest you contact Mr. Clinton B. Scoble

Jr. with

BWF America, Inc.

7453 Empire Drive #340

Florence, KY 41042

USA

Phone: (859) 282-4550

FAX: (859) 282-4555

They have a collector bag material that may be able to resist the moisture

problem.

Regards,

Jim Boen

Benetech, Inc.

Direct Phone: 770 693-2113

Sales FAX: 770 693-2102

Direct Digital FAX: 770 693-2108

Cell Phone: 770 714-2771

@amerexind.com> ■

I suggest you contact Hosokawa Micron (offices in Summit, NJ) - they are

probably the largest manufaturers of bag houses - used to be Micropul, now Hosokawa Micron's Environmental Division

Mr. Warren Fuller

President

Paul O. Abb Inc.

139 Center Ave.

Little Falls, NJ 07424

USA

wfuller@pauloabbe.com ■

Thank you for all your coments and recomendation.

I need to say also that each fluid bed dryer (there are three) has a positive disp. fan of 41,000 CFM. The temperature at the outlet of the dryer will be 60 ºC.

Do you think is too large for a baghouse? or there is no problem with that.

Thanks ■

Dear Mr. Alvarez,

High humidity need not necessarily be a problem to a baghouse, but test to

characterize your gases and dust would be needed. We would be very glad to assist you with such work. Please send us any more information if you are

interested in a study.

Regards,

Cameron Harris

CameronH@hgeng.com ■

The equipment that would take care of the dust collection portion of this

particular application would best be supplied by companies such as American

Air Filter, Donaldson/Torit, Griffin Environmental and the like.

Our product (compressed air filtration and purification) would then be needed to operate the bag cleaners on these types of collectors.

The issue of condensation in the exhaust line is not uncommon, and is

typically handled by having insulation on the pipe leading from the source.

Bill Ulrich

Van Air Systems Inc.

2950 Mechanic St.

Lake City PA 16423-2095

814-774-2631 Phone

800-840-9906 Phone

814-774-0778 Fax

814-774-2636x254-direct

bulrich@vanairsystems.com

www.vanairsystems.com ■

Dear Sir,

We have notification via Mr. John Whitehead, Shapa Gen. Secretary, that you

may have a requirement for a dust collector to serve a fluid bed dryer.

DCE Donaldson Ltd. is a major manufacturer of dust control plant in Europe

with experience of dryer applications in the food industry. We would be

pleased to receive any formal enquiry you may have for this application.

Our address is DCE Donaldson Ltd., Humberstone Lane, Thurmaston, Leicester,

LE4 8HP, United Kingdom.

Tel 0116-2696161 Fax 0116-2564268

Regards,

Ken Wright

Sales Manager

Mobile no. 07774-276562

kwright@Mail.Donaldson.com ■

We are a supplier of the so called Bulkflow Cooler and I was just wondering if this type of equipment used as a Drier might be a solution for you. It will for sure totally eliminate the need for a dust collection and - or air handling system.

Please visit our website www.bulkflow.com

G Boeyink

manager Europe

boeyink@bulkflow.com

+31 543 531 861 ■