Rotary drum dryer design

Rotary drum dryer introduction

Rotary dryers are widely used in food, feed, chemical, pharmaceutical, mining and other industries. The working process of the equipment is as follows: After the dewatered wet material is added to the dryer, the material is evenly dispersed in the dryer and fully contact with hot air under the rotation of the plate reader which is evenly distributed in the drum, accelerating the drying heat transfer and quality transfer. During the drying process, the material is discharged from the finished product in another section of the dryer by a star-shaped discharge valve, under the action of a slanting plate and hot air. This machine is suitable for drying all kinds of dregs with less than 85% water content, such as beer dregs, bean dregs, spray pulp corn husk, coal mud, fruit dregs, etc. 

It has good effect for opening up feed resources, reducing feeding costs and environmental pollution for 10 years, the main export products of our drum dryer are vibration drying equipment, vacuum drying equipment, small and medium grain, food and agricultural, forestry and special products drying equipment, the annual export volume is more than a few hundred units, the main export areas are Southeast Asia and other developing countries, and has opened the door of the European and American markets.

sawsust rotary dryer

Rotary drum dryer design

The heat source for the rotary dryer comes from the combustion unit and uses a down-flow heating method. Therefore, the material that needs to be dried, from the feed box, feed slips into the cylinder, i.e., pushed back by the spiral plate. As the dryer is tilted, the material flows to the back end under the effect of gravity and rotation on the one hand, on the other hand, the material is repeatedly copied up, brought to the upper end and then continuously spread down, so that the material forms a uniform curtain in the tube, fully with the tube of the thermal airflow for heat exchange, due to the repeated spread of the material, the moisture contained in the drying, thus achieving the purpose of drying. 

The operation opens the door and rotates the dewatered material evenly in the rotor, then closes and locks the door tightly. Depending on the type of material, select the appropriate time and adjust the timing device to the desired time. Press the start button to start the fan, and the direction of rotation of the rotor can be selected from unidirectional or bidirectional rotation according to the user’s needs. Simply rotate the computer board switch to one way or both ways and the machine will perform one way or both ways as required. (Forward 25 seconds, stop for 5 seconds, reverse 25 seconds) often watch the internal fabric turning from the observation window, if you find an unexpected situation should promptly cut off the power and check the fault. The machine will stop automatically when it reaches the specified time, and the operator must be asked to open the door to check the drying of the internal fabric.

sand rotary dryer

Rotary drum dryer applications

The dryer is mainly used to dry materials of certain humidity or particle size in ore dressing, building materials, metallurgy, chemical and other departments. The dryer is widely used in tea, Chinese herbs, corn, vegetables, food, chicken manure, slag, towel quilt, sawdust, coal sludge, desulfurization gypsum, compound fertilizer, honeysuckle, straw briquetting fuel, charcoal machinery, wood chip pellet fuel, sawdust briquetting, agricultural engineering and other industries. 

The main types of dryers are: rotary dryer, three-way dryer, three-tube dryer, intermittent dryer, direct heat dryer, clothes dump dryer, powder dryer, stone professional dryer, new dryer, second-hand dryer, industrial dryer, tea dryer, Chinese herb dryer, corn dryer, vegetable dehydration dryer, food dryer, chicken manure dryer, drum dryer, rotary dryer, stone dryer, rotary dryer, solder dryer, automatic dryer, oil dryer, electric heating dryer, energy-saving dryer, clothing dryer, towel quilt dryer, computer intelligent dryer, steam dryer, gas dryer, coal sludge dryer, slag dryer, sludge dryer, quartz sand dryer, sand dryer, fly ash dryer, desulfurization plaster dryer, sawdust dryer, tunnel dryer, dehydration dryer, compound fertilizer dryer, honeysuckle dryer, wine tank dryer.

Rotary drum dryer working principle

The power generated by electric power, diesel power, wind power, flammable material power, etc. is heated by ambient air and transported to the perimeter of the pass-through, which then reaches the appropriate temperature for dehumidification treatment. The process is as follows: the wet material is fed to the hopper by a belt conveyor or bucket elevator, and then through the hopper’s feeder into the feed end through the feed pipe. The slope of the feeding pipe should be greater than the natural inclination of the material so that the material flows smoothly into the dryer. 

A dryer cylinder is a rotating cylinder that is slightly inclined to the horizontal line. The material is added from the higher end, and the heat carrier enters from the lower end, and contacts the material in a counterflow, there are also heat carriers and material together and flow into the cylinder. As the cylinder rotates the material runs by gravity to the lower end. In the process of moving forward in the cylinder, the wet material is directly or indirectly given heat by the heat carrier, so that the wet material can be dried, and then sent out at the discharge end through the belt machine or screw conveyor. 

In the cylinder body wall is equipped with a copy plate, its role is to copy the material up and down, so that the material and airflow contact surface increases, in order to improve the drying rate and promote the material forward. Heat carriers are generally classified as hot air, flue gas, etc. After the heat carrier has passed through the dryer, a cyclone dust collector is usually required to trap the material in the gas. To further reduce the amount of dust in the exhaust gas, it should also be released after a bag filter or wet filter

chicken manure dryer

Rotary drum dryer advantage

The drying strength is high, and due to the high dispersion of the material in the airflow, the entire surface of the particles is actively the effective area for drying. Short drying time. The airflow dryer is simple in construction, has a small footprint and is easy to build and maintain. High handling capacity and high thermal efficiency. When drying non-bonded water, the thermal efficiency is up to 60%. The dryer achieves “zero horizontal thrust”, which greatly reduces the wear of the retaining wheel, and the barrel runs smoothly and reliably; the dryer adopts “spherical pallet device”, which makes the fit of the pallet and the roller always in linear contact, thus greatly reducing the wear and power loss.

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