We are very excited about a recent project being developed to help recycle left over food waste and turn it into land applicable waste. With the use of drum dryer processing of food waste we can reduce BOD’s in the environment. Biological Oxygen Demand (BOD) is an indirect measurement of the concentration of biologically degradable material present in organic wastes that directly effects how long it takes for the waste to breakdown. Please watch for more developments regarding our recycled food waste project.

Optimum operating conditions for your food or pharmaceutical drum dryers, or any other type of drum drying process, is important.

Humidity in the dryer room can cause undesirable condensation on ceilings and walls. The walls and ceilings should have an insulating valve, high enough to insulate the interior room surfaces from cooler outside temperatures and prevent the water vapors from condensing. Each dryer room should be evaluated and designed to specifications which take into account the physical operating conditions of the drum dryer, the product being produced, the interior room environmental conditions, and the exterior plant environmental conditions.

The drum dryer must operate in a uniform controlled environment in order to produce a uniform controlled product. Variations in humidity, temperature, and air currents in the dryer room can affect the overall productivity of the drying process, the stability of the gap between the dryer drums, the percent of moisture in the final product, and other factors related to the drying process. A qualified ventilation engineer should establish the dryer room ventilation conditions and specifications for a particular production installation.

Drum Drying Resources can provide data and review the recommendations for conformance to proper conditions for drum drying. Drum Drying Resources supplies new, rebuilt, and retrofitted Double Drum Dryers to the drying industry. Each dryer is configured to specific designs, specifications, and systems to produce your product at maximum quality, sanitation, and productivity levels.

Dry product produced by drying on the steam heated drums of a drum dryer is usually conveyed, cooled, sized, screened, accumulated and stored for packaging, and finally filled into a commercial package for sale. The Drum Drying Resources basic dry product processing and packaging system describes the elements of the equipment and operations dedicated to accomplish this objective after the drum drying process. Discussion Dry product leaving a drum dryer is hot due to the drying process and usually of random sized pieces as it is scraped from the drying rolls into an accumulating conveyor. Product specifications usually call for a uniformly sized product flake, particle, or powder form and cooled to ambient temperature for proper storage and packaging. Also, variations in the final product characteristics due to the formulation and processing of the product slurry may occur. This requires the accumulation and blending of various segments of the dryer production to yield a more uniform final product. You can read more in our DDR Techinical Bulletin – DDR 16 by clicking here to download the pdf file in convenient Adobe Reader pdf format.

The following information is suggested as a guideline for inspecting used double drum dryers

One Set (2) Dryer Drums

a. The drum must pass a hydrostatic pressure test of 1.5 times the rated pressure for 1 hour.
b. Drums must have a wall thickness which will permit the reconditioning of the drum surfaces and pass a Hartford Boiler re-certification pressure rating test. The drum diameters must not be less than a 1/2 inch under the original drum diameters.
c. The faces of the drums must not be damaged or have indentations more than .015 inches deep.
d. The shoulders of the drum faces must not be damaged or worn in excess of 1/32 of an inch.
e. The bearing shafts must not be damaged. For shafts with roller bearings, the shafts must measure to a tolerance of + .000 – .006 inches of the bearing diameter. For shafts with sleeve bearings, the shafts should measure no more than .012 inches below the bearing diameter.
f. Threaded holes in the shafts and drums for mounting covers, steam joints, caps, etc., should not be stripped or worn.
g. Key-ways in the shafts for drive gears or sprockets should not be worn.
h. Documents on the registration of the drums, as well as National Board of Boilers and Pressure Vessel Inspectors numbers should be available.

Read more in our Drum Drying Resources Technical Bulletin – DDR02 click here. Visit our Technical Bulletins Page to see all of our Technical Bulletins.