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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.

with what material can rotary dryer shells be constructed?

with what material can rotary dryer shells be constructed?

Dryer shells can also be tailored in many ways, depending on the material and process requirements of the customer. For example, shell thickness can be fine-tuned to improve heat retention via the addition of insulation.

A properly constructed shell is critical to the drying operation at hand. The shell must run true and concentric in order to maintain process efficiency, and it must be dependable for years to come. A poorly manufactured shell will promote wear on all components, resulting in premature failure, and thus operational downtime.

lime kiln-rotary kiln,rotary dryer_hongke heavy machinery co.,ltd

lime kiln-rotary kiln,rotary dryer_hongke heavy machinery co.,ltd

Energy-saving and environmental protection active lime rotary kiln production line, the main equipment includes vertical preheater, transfer chute, rotary kiln, vertical cooler, multi-channel pulverized coal combustion device and other equipment. The whole system has high automation, high labor productivity and good quality of lime products. It is an advanced production system in the field of active lime production.

We are a professional rotary kiln manufacturer in China, providing flowchart and installation service. According to different fuels, rotary kiln can be classified into gas-fired rotary kiln, oil-fired rotary kiln and coal-fired rotary kiln. It is widely used for different materials with a processing capacity of 180-1, 000 tons per day, a dimension of2.540m-4.868m and cement production capacity of 50-1000t/d, being easy to operate and durable in use.

Active lime kiln is a type of rotary kiln and it is the main equipment used for calcining active lime. This equipment is mainly composed of cylinder, supporting device, supporting device with catch wheel, transmission device, lubrication device, mobile kiln head and sealing device at the end of the kiln with the advantages of simple structure, reliable operation and easy control of the production process.

Active lime kiln is equipped with advanced structure. The vertical pre-heat equipment can improve its pre-heating effect effectively with low-pressure loss, and the in-kiln decomposition rate of the pre-heated limestone can reach 20-25% and the 10-15mm fine particle limestone materials can be directly used.

This active lime kiln(limestone rotary kiln) adopts combined type scale sealing to ensure that the air leakage factor is less than 10%. Compound type refractory matter is adopted to reduce the radiant heat loss. The infilling type circular or square vertical cooler which can be divisionally ventilated can make the temperature of the lime cool that is discharged from the cooler to 80+ of the environment temperature for the convenience of transportation and storage, and it can also pre-heat the in-kiln secondary air to more than 700 to make full use of the waste heat and save energy.

rotary dryer zhengzhou taida drying equipment co.,ltd

rotary dryer zhengzhou taida drying equipment co.,ltd

Sludge lime disposal project in Yanjiao sewage plant Yanjiao sewage treatment plant is located in the southwest of Yanjiao Development Zone. The project site is located in Yanjiao sewage plant in the northwest corner of processing, on the west side of...

Brief introduction of process flow 1.Collection and transportation of sludge: trained personnel to clients collected sludge with iron and space bag packaging, and by the special transport of dangerous goods vehicle transport to the factory dangerous g...

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Address of headquartersNO. 198, longding industrial zone, high-tech development zone, zhengzhou city, china Sales hot line [email protected] Fax

rotary dryer_henan yuhong heavy machinery co.,ltd

rotary dryer_henan yuhong heavy machinery co.,ltd

Rotary dryer, also named as rotary drum dryer and rotary drying machine, is energy-saving and high efficient drying equipment. Rotary dryer is widely used for drying materials in industries like cement, mine, building materials, chemistry, food and fertilizer, etc, raw material such as: sand, coal, slag, slurry, woodchips, etc.

The raw material sand will be fed into the hopper through belt conveyor or bucket elevator. Sand rotary dryer is a slightly inclined rotating cylinder with horizontal lines. Raw material sand will be fed from the higher end, while hot air enters from low-end, forming counter-current contact with the drying raw material sand. As the rotation of the cylinder, raw materials run to the end of the sand dryer under gravity. Wet raw material, in the course of the cylinder moving forward, directly or indirectly get heat from hot air which temperature is more than 500C, for drying wet material, and then discharged through the screw conveyor or belt conveyor installed at the end of discharging part. Sand dryer is equipped with raising plate on the inside cylinder wall, and the raising plate plays the role of raising and falling down materials, increasing the contact surface between material and air flow, to improve the drying efficiency.

Focus on Quality, Serve Worldwide Establish strong sales service system with full coverage for 6 continents, 140 countries. Whatever your requirements, you 'll find the perfect service-oriented solution to match your specific needs with our help.

rotary drum dryer working principle- sunco machinery

rotary drum dryer working principle- sunco machinery

Rotary Drum Dryer Working Principle: Wet material goes into the feeding hopper by belt conveyor or bucket elevator, then through the feeder goes into the feed pipe. The feed pipe slope is greater than the natural inclination of the materials, so that the material can inflow the rotary dryer smoothly. There is one hot air furnace supply the hot flue gas for the rotary dryer usually. The fuel can be waste wood, coal, natural gas, diesel, etc. The rotarydryer cylinder is tilted slightly compared with horizontal. Materials and hot flue gas goes into the rotary dryer cilinder from the higher end. During the rotation of the cylinder, the material by gravity goes into the lower end. When the wet material is in the process of moving forward in the rotarydryer cylinder body, the lifting plates inside the rotary dryer cilinder makes the material up and down to contact with the hot flue gas completely. Thus, the moisture inside the wet material is evaporated into water vapour, and finally we get the dried materials. There is one high pressure induced draft fan is used to suck out the water vapour out of the rotarydryer during the drying process. Finally the water vapour with some dust goes into the cyclone dust collector. In the cyclone dust collector, the dust is seperated from the water vapour and falls down from the bottom of the cyclone dust collector; the water vapour leaves the cyclone dust collector from the top pipe of the cyclone dust collector, and finally goes into atmosphere through the chimney. At the end of the rotary dryer, using one belt conveyor to transport the dried material into trucks or storage room directly. The rotary drum dryer seems very simple, but in fact it is one whole drying system, and the drying system should be designed according to: --- The features of raw material, for example the wet sand has surface water which is easier to be dried, but the wood chips has inner water which is more difficult to be dried. ---Initial moisture content(%) of the wet material. ---Output moisture content(%)the dried material needed. ---Bulk density (kg per cubic meter) of the wet material. ---Input capacity (ton per hour). ---Output capacity(ton per hour). ---Fuel Choice such as coal, waste wood, natural gas, diesel, etc. ---End use of the dried product. When the above information are clear, then Sunco Machinery engineers can calculate and design the suitable and reasonable rotary dryer system for the customers accordingly. Sketch Map of Rotary Drum Dryer System: Rotary Drum Dryer for drying chicken manure: Rotary Drum Dryer for drying Sawdust: Rotary Drum Dryer for drying Wood Chips: Rotary Drum Dryer for drying Wood Shavings in Greece: Rotary Drum Dryer for drying Sand in Malaysia: Rotary Drum Dryer for drying slag in Malaysia: For more details ofrotary drum dryerworking principle, please feel free to contact us: Email:[email protected] Website:http://www.suncomachinery.com/products/drying/rotary-dryer-01.html Tel / WhatsApp:+86-158 3821 4261 YouTube:https://www.youtube.com/watch?v=i2GiO1HLn0A http://www.youtube.com/watch?v=3K_Q819uqlQ&feature=youtu.be https://www.youtube.com/watch?v=yGzcIJ0aFL0 https://www.youtube.com/watch?v=z1knBGM-3TM http://www.youtube.com/watch?v=w6jA_YBLokM https://www.youtube.com/watch?v=sKSfYwgMx_Q https://youtu.be/TujJp8PLMiI http://www.youtube.com/watch?v=AgRgm-9OWBE

Wet material goes into the feeding hopper by belt conveyor or bucket elevator, then through the feeder goes into the feed pipe. The feed pipe slope is greater than the natural inclination of the materials, so that the material can inflow the rotary dryer smoothly.

The rotarydryer cylinder is tilted slightly compared with horizontal. Materials and hot flue gas goes into the rotary dryer cilinder from the higher end. During the rotation of the cylinder, the material by gravity goes into the lower end. When the wet material is in the process of moving forward in the rotarydryer cylinder body, the lifting plates inside the rotary dryer cilinder makes the material up and down to contact with the hot flue gas completely. Thus, the moisture inside the wet material is evaporated into water vapour, and finally we get the dried materials.

There is one high pressure induced draft fan is used to suck out the water vapour out of the rotarydryer during the drying process. Finally the water vapour with some dust goes into the cyclone dust collector. In the cyclone dust collector, the dust is seperated from the water vapour and falls down from the bottom of the cyclone dust collector; the water vapour leaves the cyclone dust collector from the top pipe of the cyclone dust collector, and finally goes into atmosphere through the chimney.

complete rotary dryer design and calculation-palet

complete rotary dryer design and calculation-palet

Rotary DryerfromQingdao Palet Machinerycan reduce the biomass material moisture content from 40-55% to below 10% -15%, according to the customers request. How to choose the rotary dryer design for wood chips?Wehave finished a successful project for wood chips dryer in Malaysia.

Qingdao palet machinery co,.ltd is a professional manufacturer of biomass wood pellet mill, wood pellet plant, rotary dryer, activated carbon rotary klin,activated carbon machine, hammer mill, crusher, etc.

rotary dryers | general kinematics

rotary dryers | general kinematics

Rotary dryers are used to remove unwanted water in organic materials to make them more usable. Rotary dryers lift the materials and pour it through heated air allowing the moisture to evaporate, which makes the organic materials viable. Although rotary dryers take regular wear and tear from these organic materials during the drying process, they are designed to withstand both high temperatures and abrasive materials.

Every General Kinematics Rotary Dryer is custom engineered to maximize the unique drying and processing needs of your material. GK Rotary Dryers use rotary motion to lift and cascade your material through the hot gas stream, evaporating moisture evenly. Dryers can be designed using various drying technologies, and when working with us, you can pick the technology that best fits your needs. Choose between direct drying in counter-current or co-current flow, or indirect drying, which utilizes ing external heat applied to the exterior of the drum shell.

GK rotary dryers are built to last, and may also help you reduce your maintenance costs. Thats because our designs use extra heavy-duty components for extended uptime and minimized upkeep. Not only that, but material contact surfaces are manufactured from wear-resistant materials, so drums will last a long time between servicing. Rotary trunnions and rings are forged for superior strength and durability and are easy to replace or resurface.

Let the engineers at GK work with you to design a complete drying system that meets your needs. Couple your rotary dryer with GKs proven vibratory material handling equipment to pre-process, feed, and deliver your dried product to the next step in your manufacturing process.

Learn More To learn more about General Kinematics rotary dryers and equipment, simply fill out the form below to get started today. Since our rotary dryers are build-to-order, were here to help you figure out what type best meets your needs.

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