Drum Dryers

Product Details:

Drum dryers operate by applying a thin layer of the product to be dried to the outside of a rotating drum. The drum is internally heated by steam which quickly evaporates any liquid from the product. After almost one full revolution the remaining dried material is removed from the drum by a knife as a film or powder.

Construction of drum dryer

Drum dryer is a moving bed dryer. The unit is constructed from cast iron and stainless steel, providing cleanliness and resistance to chemical attack. The drums are engineered with hard chrome plating or chrome plated over nickel to ensure maximum heat transfer and to accommodate high steam temperatures and pressures, precision machined to provide maximum and reproducible heat transfer throughout its life. The drums are hollow horizontally mounted 0.6 to 3.0 meter in diameter and 0.6 to 4.0 meter in length, whose external surface is smoothly polished. Steam or heating coils can be used inside the drum for heat generation. Heat is transferred by conduction to the material that can be controlled with a thermostat. Drum is rotated with a motor device at 1-10 r.p.m.

The drum body of the drum dryer is heated on the inside by steam. Steam heating gives a uniform temperature distribution over the drum surface to provide consistent product quality. The steam condenses on the inside of the drying drum. The condensate is continuously removed from the drum so that the largest possible surface area remains available on the inside of the drum for condensation of the steam. The steam system is a closed system, which means that the product cannot come into contact with the steam or condensate. Depending on the design of the drum dryer, the product is applied continuously as a thin film on the underside or top of the main drum. As the drum turns it is heated on the inside and the product dries on the outside of the drum dryer. The short exposure to a high temperature reduces the risk of damage to the product. The water or solvent evaporates and leaves from the surface of drum. If necessary, the vapor can also be suctioned-off locally around the drum. The dried product layer finally reaches the knife and is scraped-off.

Advantages

(i) Drum dryer gives a rapid (few seconds) drying and its mass transfer rate is higher.
(ii) The entire material is continuously exposed to uniform heat. This process is characterized by short drying time and minimum product heating.
(iii) The equipment is compact 100% closed system and tailored models are available.
(iv) Their simple operation makes them run with the minimum of training and require no specialist maintenance.
(v) Drum dryers are economical with cheap installation and 24 hour a day continuous production.
(vi) It can have vacuum facilities to prevent dust emission thereby giving a guarantee of optimal hygiene during the complete production process.
(vii) This dryer work with minimum energy consumption and does not require large dust recovery systems such as filters.

(viii) The heat is transferred by steam to the (metal) wall, which in turn transfers it to the product on the other side of the wall. All the heat transferred by the wall is used to dry the product and does not leave the machine or chimney unused making this dryer a much more efficient process.
(ix) Using these dryers product supply can be controlled. Furthermore, drums create a kneading effect that prevents the formation of lumps in sticky products.
(x) A perfect distribution over the entire length of the drum makes the system ideal for processing doughy or pasty products.
(xi) The temperature of the drum can be controlled independently for the required drying task by setting the steam pressure and thus are best suited for processing certain heat-sensitive products,

Additional Information:

• Production Capacity: 2 no. drum dryer per month
• Delivery Time: 3 months