In line with our many years’ profound experience and clients’ positive feedback, we design and develop the most environmental and energy-saving cocurrent drum dryer with section-by-section heating function.

Cocurrent drum dryer, specially designed for raw materials used for making biomass energy pellets, is adopted with section-by-section heating technique, thus being much more energy-saving than traditional type, and maximizing in energy conservation and drying cost. The suitable materials are like sawdust, wood chips, shavings, rice husk, vinasse waste, etc.

For the traditional cocurrent drum dryer, combustion chamber and wet material feeding are in the same side, so do hot air and material movement. Wet materials move to discharging end from feeding end, likewise, hot air is vented from feeding end to discharging end under the action of fan blower and IDF, where wet materials are dried along with air heating. In the initial stage of cocurrent drying, the driving force is more powerful, the drying medium’s temperature will lower along with the temperature increment of wet raw materials, therefore, and this kind of dryer only fits for materials with lower drying requirements and smaller capacity.

To raise the capacity of dryer, it can be done thru increasing dryer’s diameter and length, and elevating hot air temperature; but over temperature will be more likely to ignite raw materials, so the left ways are to increase dryer’s diameter and length; the temperature of drying materials in the back of dryer will be too low along with the raised length of dryer, thus limiting drying effect and capacity.

(A)  . Improve drying efficiency of cocurrent drum dryer

(B)  . Lifting the capacity of cocurrent drum dryer

The key to these two problems lies in temperature reduction of materials in the back of dryer, limiting drying effect and capacity.

Cocurrent drum dryer of section-by-section heating solves these two problems by heating section by section process.

Cocurrent drum dryer of section-by-section heating is equipped with an air duct on the basis of traditional countercurrent dryer, which delivers a part of hot air from hot air furnace to the middle of dryer thru fan blower, thus raw materials are dried twice, moreover, further maximizing drying effect and capacity.

The traditional concurrent dryer only has one hot air duct connector, which is in the middle of dryer’s feeding cover.

For cocurrent drum dryer of section-by-section heating, the main hot air duct connector is under the feeding cover, and reheating air duct connector is installed in the middle of dryer’s feeding cover.

Reheating air duct, fixed in the dryer body thru air duct frame, rotates with dryer, and is connected with reheating air duct connector by sealing rotary joint, thus guaranteeing the leakproofness of dryer tunnel. The reheating air quantity is controlled approx. 1/3 of main hot air quantity. Suppose the diameter and length of the dryer are same, Cocurrent drum dryer of section-by-section heating will be able to improve the efficiency and capacity by 20% at least compared with traditional cocurrent drum dryer.

Email:china_george@126.com

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