The Double Drum Dryer is frequently used for products with a moderate viscosity. On the picture can be seen that the product is fed into the nip between the drums, the latter rotate in opposite directions to each other and a thin film of product passes through a gap between both drums. The thickness of this layer can be altered by changing the gap setting. Among the products processed on this type are milk, whey, yeast, various kinds of glues, pigments and waste products.
Double Drum Dryer is widely used in drying granule material in fixed moisture range, all kinds of molding sand in casting industry and blast furnace slag in building/cement industry. Small size clay, small granule material in chemical industry which can't happen chemical effect, high temperature resistance and not have strict control to smoke. According to different moisture requirement for dried material in various industry, finished products water content be able to below 1-0.5%.
This is basically a conduction dryer. Wet feed (in liquid or paste form) is fed in nip between the two drums and is applied on the outer surface of both the rotating metal cylinders. Steam at required pressure is admitted into the individual drums via rotary joints for heating. Material film dries to the final moisture level and is scrapped off.
This machine can also be offered as totally enclosed for products having dusting tendencies. The rotating drums are heated with steam at prescribed pressure and condensate drainage is ensured. The feed is admitted in the gap between the drums. The layer of the feed formed on the drum is scraped out as dry material by the scraper blade.
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A double drum dryer working under atmospheric pressure was developed for water evaporation rate of 20kg/h. Potato slurry of 12% solid concentration was dried to obtain potato flakes. Experiments were carried out at drum speed of 5 to 30rpm, steam pressure 2 to7kg/cm2 gauge (saturation temperature 120164C) and liquid level 5 to 10cm at the nip of drums. The responses obtained were, moisture content of the potato flakes: 1.1844.15% (db), dry matter output rate: 1.332.87kg dry solid/h and L value of colour: 30.966.4. Steam pressure and drum speed were the most influencing parameters affecting all 3 responses. Optimum combination of operating variables for obtaining potato flakes of 8% (db) moisture content, high dry solid output rate and high L value of colour was: drum speed 19.6rpm, steam pressure 4.3kg/cm2 gauge (saturation temperature 145C) and liquid level at the drum nip 6.3cm. At this combination of independent variables, residence time of the product on drum surface would be 2s, final moisture content of product 8% (db), product output rate 2.4kg dry solid/h and L value of colour 53.
Trystram G (1988) Contribution lautomatisation dun procd industrial de schage sur cylindre. In: Renard M, Bimbenet JJ (eds) Automatic control and optimisation of food processes. Elsevier Appl. Sci, London, pp 265283
Kakade, R.H., Das, H. & Ali, S. Performance evaluation of a double drum dryer for potato flake production. J Food Sci Technol 48, 432439 (2011). https://doi.org/10.1007/s13197-010-0184-0
The response of an industrial scale double drum dryer to variation of steam pressure, drums rotation speed and level (height) of the gelatinization pool between the drums is presented. To our knowledge, this is the first time that the gelatinization pool level is treated as an input variable. The output variables are the product's moisture content, mass flow rate and specific load (equivalent to the product's film thickness). The effect of the drum surface temperature and width of the gap between the drums on the behavior of the output variables is examined. A theoretical analysis is presented for the qualitative assessment of the basic process variables that control the film thickness of the product. The role of the thermal inertia of the drum wall to the response of the dryer is discussed. Changes in the thermal efficiency of the dryer are inferred from overall heat transfer coefficients.
The system consists of Vacuum Double Drum Dryer, Condenser, Receiver, Feed Vessel with Valve, Accessories, Skid etc. The Double Drum Dryer except the drive is enclosed in a suitable cylindrical enclosure having quick opening doors at both the ends. The enclosure is jacketed, to which low pressure steam is supplied. This ensures that there is no condensation of vapour generated during the drying operation, on the walls of the enclosure. The drive to the double drum dryer is fixed outside the enclosure. The vapours escaping from the dryer enclosure are condensed in a suitable shell and tube type condenser and collected in a suitable receiver. Material is fed to the drum dryer because of vacuum suction. The valve provides requisite control.
Wet feed is charged as a batch and is subjected to indirect heating while undergoing agitation due to the action of tumbling. The operation is normally carried out in vacuum. Recovery of solvent is possible by condensing the vapours generated during the drying operation.
Wet feed is charged as a batch and is subjected to indirect heating while undergoing agitation due to the action of paddle mixing, The operation is normally carried out in vacuum. Recovery of solvent is possible by condensing the vapours generated during the drying operation. Frequency : 50/60 Hz Power : 7.5Hp Surface treatment : Polished Material : Stainless steel