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a brief introduction to the rotary drum dryer zoneding machine

rotary drum dryer | three-ring drum dryer

rotary drum dryer | three-ring drum dryer

The three-ring drum dryer realizes high-temperature and fast drying process, Compared with the traditional dryer, the floor space is reduced by 2/3, energy saving is 40%, and the drying strength is doubled.

The Sawdust and other materials enters the belt conveyor through the feeding hopper, and the equal-thickness stream is fed into the dryer feeding port through the feeding air-closing device, and enters the multi-cylinder roller together with the high-temperature hot flue gas from the hot air furnace at the feeding port of the dryer. after three cycles of mass heat exchange to complete the drying of the material, the dried material enters the multi-group cyclone separator, the dry material is discharged through the discharge air shut-off device, and a part enters the briquetting system and is extruded into blocks. Forming the finished product. Another part of the material enters the anti-blocking fuel feeding device, and is sent to the hot blast stove through the fuel feeding fan, and under the action of the cyclone-enhanced combustion fan, the combustion is completed and the high-temperature flue gas is formed, which is used as the whole drying system. The exhaust from the cyclone is discharged into the atmosphere.

rotary dryer design & working principle

rotary dryer design & working principle

For evaporating moisture from concentrates or other products from plant operations, Rotary Dryers are designed and constructed for high efficiency and economy in fuel consumption.Whenever possible to apply heat direct to the material to be dried, Rotary Dryers of the Direct Heating Design are used. If it is not possible to apply heat direct to the material to be dried, Rotary Dryers of the Indirect Heating Design can be furnished so that the heated gases will not come in direct contact with the material.

Rotary Dryer is a simple, inexpensive unit for reducing the moisture content of flotation concentrates, as well as chemical and industrial products. Frequently the saving of shipping weight so effected will pay for the dryer in a few months. Difficulties from freezing while in transit are also eliminated. Many industrial projects are now using Dryers for control and production purposes on many materials.

Three main types of Rotary Dryers can be supplied. The direct heat unit is used when it is permissible for the drying gases to come in direct contact with the material being dried. Partition plates increase the heating surface. Drying may be by hot air or exhaust gases from other operations. If this drying gas has a deleterious effect on the product, then an indirect type of dryer can be supplied. A further derivation is the Tedrow Steam Dryer.

Of the different types of dryers that there are the most common is the ROTARY DRUM DRYER/Kiln, This type of drier is common not only in the mining industry but you will find them in fertilizer plants, Cement plants, and peat hogs to name but a few.

The theories behind these machines are very simple, heat an air space up, and then tumble the material to be dried through this space until it is dried. All though it sounds simple there are problems that have to be solved before the required results are met. But first, so you know what we are talking about lets go through the design of a drier.

First is the KILN, this provides the heat, The BURNER is inside this portion. The fuel for the burner is usually diesel although heavy crude oil could be used in some cases. To be able to generate enough heat to dry the concentrate air must be added by way of a BLOWER. In front of the kiln is the point that the wet concentrate enters the drier. It is put into the revolving SHELL. The shell is on a slight incline. As the Concentrate is tumbled through the hot air mass of the drier it travels down this incline to the exit of the drier.

At this exit point the concentrate is either deposited straight into a storage area or taken to the storage area by a conveyor. It is also at this point that there is an EXHAUST HOOD. This provides a controlled escape passage for the fumes and water vapor that is generated by the concentrate drying. This is a very important function and the operator will have to be sure that it is open at all times. If it should become blocked the water vapor will not be able to escape. The concentrate will become wet and sticky which will result in the discharge plugging. The wet sticky concentrate will also lower efficiency level of the drier for an extended period of time. This happens because inside the drier shell are what are termed FLIGHTS these are flat pieces of metal that are bolted onto the shell.

They are there to lift the concentrate up to the top of the shells rotation and drop the concentrate through the hot air. If the water vapor isnt taken away, the concentrate becomes sticky from reabsorbing the water. This sticky concentrate will fill the spaces between the flights.

The concentrate will not be lifted and dropped through the hot air. This results in a long term condition of poor performance even after the initial problem has been cured. These flights will remain buried in concentrate. This removal of the water vapor is one of the functions of the blower. It assists the natural process of air movement as the hot air mass expands. To prevent the buildup of concentrate on the flights there are often CHAINS attached to them. As the drier revolves the chains slap the flights preventing concentrate from building up on dryers walls.

The drier shell is rotated separately from the stationary kiln section. To achieve the rotation a BULL GEAR is attached around the shell section. There are also two flat rings attached to the shell. These provide surfaces for support rollers to roll on. There is another problem that the inclined shell has, the incline causes the shell to want to slide in the direction of the incline. To prevent this additional rollers are attached to the last set of rollers.

rotary drum dryer wide application of fertilizer drying machine

rotary drum dryer wide application of fertilizer drying machine

With the development of agriculture, people pay more and more attention to agricultural and sideline products. The pollution of livestock manure to the environment is more and more serious, but cow manure is rich in nutrients and trace elements, it is a very good organic fertilizer. The development of cow manure as compound organic fertilizer can not only turn waste into treasure but also reduce environmental pollution and prevent the spread of epidemic diseases.

Rotary drum dryeris the mainequipment of the organic compound fertilizer production line, the finished product hasafine grain. Which can be used as the culture medium to grow edible fungus agaricus bisporus, or as the feed for breeding turtles, fish, snails, chickens,and ducks.

Wet material sent to the hopper through belt conveyor or bucket elevator, adding from feeding port. The main body of a rotary drum dryer is a slightly inclined and rotating cylinder. When the material enters the inside of the cylinder, contact with the hot wind flowing downstream or counter-current through the cylinder, then effective contact with the heated wall surface and drying, the product discharged from the lower part of the other end.

In the drying process, the material moves from the high end to the lower end under the action of gravity. With the help of the slow rotation of the cylinder. The wall of the barrel body equipped with a forward plate. Which keeps picking up and dropping the material, greatly enhancing the thermal contact surface of the material. Otherwise, improving the drying rate and promoting the material to move forward. Heat carrier (hot air, flue gas) after drying materials, through the cyclone dust collector to collect a narrow belt of dust and then empty.

Zhengzhou Fusmar Machinery as a professional fertilizer drying machine manufacturer has the advantages of advanced structure, reliable performance, low energy consumption, and stable operation. Provide each customer with intimate pre-sales and after-sales professional services. From product introduction to production site and customer equipment worksite visit.

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