11 types of rotary kiln dryer

High-efficiency and energy-saving coal slime rotary kiln dryer

The high-efficiency and energy-saving slime rotary kiln drum dryer drying technology and equipment is a slime dryer dehydration system developed by Tongli for coal slime with high moisture, fine particle size, and high viscosity. This drum kiln drying system deeply dehydrates coal products through fire drying. It can process the high-moisture slime filter cake recovered by the filter press into slime products with a particle size of about 10mm and a moisture content of less than 12%, effectively improving its calorific value. Kiln dryer not only improves the coal washing and selection process but also has obvious economic, environmental, and social benefits.

What are the 7 main features of a rotary coal slime drum dryer?

The coal slime drying system eliminates the easily clogged and damaged feed chute found in rotary dryers. Instead, the drying feed material passes through a closed feeder or is directly fed into the dryer, creating a “feeding sealing-drying and dehydration-discharging sealing” process within a single machine. This multifunctional approach allows for a compact and rational equipment layout.
The stacked layout, commonly used domestically and internationally, reduces factory height from over 30 meters to approximately 10 meters, slashing basic investment costs by over 50%.
The coal slime rotary kiln dryer is outfitted with various anti-stick lifting, cleaning, and crushing devices, resolving technical issues like sticking, shedding, and blocking during the slime (coal slime) drying process. Enhanced air contact area intensifies mass and heat exchange, boosting drying efficiency and widening application possibilities.
Various types of hot blast furnaces (utilizing gas, coal, and other fuels) are employed based on evaporated water volume. Whether opting for Tongli’s patented product (reciprocating combustion furnace) or a beam-type chain furnace crafted with advanced technology, equipment operation remains reliably consistent, easy to manage, highly automated, and boasts combustion efficiencies exceeding 85%.
The drying system maintains low exhaust gas emission concentrations, generally around 50 mg/Nm3 or below 80 mg/Nm3, surpassing national standards (below 150 mg/Nm3). Additionally, vaporized water is recycled and reused, promoting environmental friendliness and energy conservation.
Automatic control of the drying system and production process parameter monitoring is achieved, reducing required personnel. Merely 2-3 individuals per shift are necessary, diminishing operating costs. Tongli’s rotary kiln offers substantial processing capacity and a broad application scope.
It accommodates various materials through different internal dryer structures. The dryer diameter spans from φ1.4-4.5M, with processing capacities ranging from 10-100-300-500t/h. The initial moisture content at the input is 30±5%, with the product’s moisture content post-drying reduced to 12±2% (or lower, adjustable). Tongli’s drying system demands less investment and yields swift returns. All investments can be recouped within 6-12 months of production commencement, delivering significant economic and social benefits to users.

What is a high-quality sand rotary dryer kiln?

The sand dryer is also what we often call a rotary drum dryer. It adopts the latest energy-saving technology in Europe – a clamp-on structure. It is a dryer that can handle a large amount of materials. It has reliable operation, great operational flexibility, and strong adaptability. Large processing capacity. Sand dryers are generally suitable for granular materials. It is widely used in building materials, chemical industry, casting, and other industries, and can be adapted to various fuels such as coal, oil, and gas.

What is the working principle of a sand rotary dryer kiln?

The sand dryer boasts a clear structure with a sense of hierarchy, comprising several key components: the cylinder, front roller ring, rear roller ring, gear, back roller, drag roller, pinion, discharging part, lifting plate, reducer, motor, hot air duct, feeding chute, furnace body, and other integral parts. Sand is conveyed to the hopper via a belt conveyor or bucket elevator, and then funneled into the feeding end through the hopper’s feeding machine.
The inclination of the feeding pipe must exceed the natural inclination of the material to ensure smooth flow into the sand dryer (yellow sand dryer). The dryer cylinder, slightly inclined from the horizontal line, rotates with materials fed in from the higher end and heat carriers entering from the lower end, facilitating counter-flow contact. At times, heat carriers and materials may enter the cylinder in parallel flow. As the cylinder rotates, gravity pulls materials toward the lower end. Progressing within the barrel, wet materials absorb heat directly or indirectly from the heat carrier, thus drying.
Subsequently, wet materials exit via the discharge end using a belt conveyor or screw conveyor. Lining the barrel’s inner wall are lifting plates, tasked with elevating and dispersing materials to enhance airflow-material contact, thereby boosting drying efficiency and material advancement.
Heat carriers typically include hot air, flue gas, etc. Following dryer passage, a cyclone dust collector typically traps gas-borne materials. To further minimize exhaust gas dust content, passage through a bag dust collector or wet dust collector is recommended prior to discharge.

Introduction of high-capacity slag rotary dryer

The slag dryer is a kind of drying equipment mainly used to dry slag. It has a simple structure and is convenient to use. It is a relatively affordable equipment among the current dryers. This series of dryers can be used to dry steel plants. The smelted material lava is slag produced after rapid water quenching. It can also be used to dry carbide slag, limestone, clay, river sand, quartz sand, water slag, and other materials. Dryers have many names according to the drying materials: those used to dry metal powder can be called metal powder dryers, and those used to dry iron concentrate pellets can be called iron ore concentrate pellets.

What is the working principle of a slag dryer?

The slag itself is relatively viscous. During the drying process, the wet slag will be transported to the feed hopper by a roller conveyor. The feed hopper is directly connected to the drying drum. The wet slag will enter the drying drum from the feeding hopper and begin to contact the hot air flow inside the drying drum, thus starting the entire slag drying process.
The entire slag drying process can be divided into three major parts. The first is that the wet slag comes into contact with the hot air flow inside the drying drum, and the temperature difference between the hot airflow and the wet slag is used to evaporate the water in the slag;
(slag dryer) The wall inside the second drying drum There is a lifting board installed on the top. The lifting board can continuously lift the slag. It not only moves the slag but also allows the slag to fully come into contact with the hot air flow during the lifting and spreading of the slag by the lifting board. Therefore, the heat exchange between the hot air flow and the slag is faster and more complete; the inner wall of the third drum is equipped with a cleaning device, which is used to remove the agglomerates produced during the drying process and the materials adhered to the drum wall. Clean to prevent clogging.

What are the features of a slag rotary drying machine?

High drying intensity. Since the material is highly dispersed in the air flow, the entire surface of the particles is actively used as an effective area for drying.
Short drying time
The airflow dryer has a simple structure, small footprint, and is easy to build and maintain.
Large processing capacity and high thermal efficiency. When drying unbound water, the thermal efficiency can reach 60%.
The dryer achieves “zero horizontal thrust”, which greatly reduces the wear of the supporting wheel, and the cylinder runs smoothly and reliably;
The dryer adopts an “aligning supporting wheel device” so that the matching between the supporting wheel and the rolling ring is always in linear contact, thus greatly reducing wear and power loss;

Best lignite rotary drying equipment overview

The lignite dryer (dryer) evaporates and utilizes the moisture of lignite and coal slime through the drying process to reduce waste. After drying, lignite can be made into briquettes for cooking and heating, and can also be used as a source of activated carbon for the Treatment of water, recovery of gold, and extraction of iodine. The proportion of lignite resources in our country is very low. Using lignite dryers to fully utilize the by-products of the washing industry has good economic and environmental benefits.

Working mechanism of lignite rotary dryer

The lignite dryer adopts a low-temperature four-stage drying process: while ensuring the quality of the dried lignite remains unchanged, the first-stage drying area uses downstream high-temperature drying. Under high humidity conditions, the inlet temperature is 430°C, and the lignite is instantly mixed with Heat and mass transfer is carried out to remove most of the water, ensuring that the chemical composition of lignite does not change and is not easily burned; the secondary drying area has a room temperature of 300°C and is a high-yield water removal area.
During the rotary drying process, the medium-temperature strong wind to ensure that no coking occurs on the surface of lignite; the third-level drying area is the normal drying area, with an indoor temperature of 120°C-210°C. The crushing device in the drum is used to repeatedly tear, hit, and scatter, and is dried downstream;
The fourth-level drying area is drying area relies on low-temperature hot airflow with negative pressure under the action of induced wind to remove moisture. It is a high exhaust area with a room temperature of 60℃-80℃. Through the above process, the quality of lignite before drying and after drying will be consistent, and the calorific value of lignite will be increased. The moisture content of the finished product will be less than 9%.

Main features of lignite dryer

There is no possibility of explosion – due to the drying process in which flue gas and coal are not in direct contact, explosion problems are eliminated.
Slight Because the dried coal moves very slowly in the dryer, the wear problem is the lightest among all drying devices.
Large single machine capacity – for drying and upgrading lignite, the single machine capacity can reach 5 million tons of processing capacity per year
Small investment – simple system and short process. By adjusting the structure and arrangement of the heat exchange elements in the dryer, large particles of coal can be dried directly. Before drying, only coarse crushing and screening are required, and no granulation is required after drying.
Low operating costs – small system voltage drop and low power consumption
One machine can be used for multiple purposes – the final moisture content of the product is easy to adjust. For lignite drying, only surface water can be removed, or both surface water and bound water can be removed at the same time according to needs. The lignite after drying and modification changes from hydrophilic to hydrophobic, with a calorific value of up to 5500-6000kcal/kg, and can be transported over long distances.

Advanced technology Industrial rotary dryer machine

Industrial dryers are very similar to other dryers. They are mainly used in mineral processing, metallurgy, building materials, chemical industry, and other industries to complete the drying of materials with a certain humidity. Henan Qianli Industrial Dryer has the function of being suitable for materials. It has the advantages of strong performance, drying a variety of materials, and simple operation, and is widely used by users.

Working principle of industrial rotary durm drying equipment

The heat source of industrial dryer equipment comes from the combustion device, and this dryer adopts a downstream heating method. Therefore, the materials that need to be dried slip into the cylinder from the feed box and are pushed backward by the spiral lifting plate. Since the dryer is placed at an angle, the material flows to the rear end under the action of gravity and rotation on the one hand;

On the other hand, the material is repeatedly picked up by the lifting plate, brought to the upper end, and continuously spread down, so that the material forms a uniform curtain in the drum. The curtain fully exchanges heat with the hot air flow in the cylinder. As the material is repeatedly spread, the moisture contained in it is gradually dried, thereby achieving the purpose of drying.

What are the 4 Features of industrial rotary dryers

It is fully controlled by a computer and can set the temperature desired by the user to dry materials.
The drum is made of a stainless steel plate with excellent heat resistance. The inner wall is smooth, which can reduce the wear of the material.
High-efficiency radiator and reasonable air ducts make the hot air directly in contact with the material, which greatly improves the drying efficiency and saves energy at the same time.
The diameter of the industrial dryer is relatively large, which facilitates the entry and exit of materials. The large-area material collection net will not easily cause material blockage and protect the smooth flow of the air duct, thus greatly improving the drying effect.

What is a low-investment high return grain rotary dryers?

The grain dryer is a tower dryer with low drying operation costs. The air heater adopts a fin heat exchanger, the structure design is advanced, and the heat exchanger has high thermal efficiency. It is one of the most advanced grain-drying equipment at present. It was first successfully researched by Tongli in China and won the second prize in the National Science and Technology Progress Award. The principle of this grain drying tower is to adopt a “concurrent-countercurrent” combined drying process and implement “segmented temperature-changing drying” according to the heating temperature of the grain. A buffer section is designed between each drying section, and “drying-buffering” is performed alternately. The drying process is optimized and combined to achieve the best results.

Structure and working principle of grain arch dryers

This grain dryer is an ideal grain drying equipment for drying grains and oilseeds. The processed products are input from the top of the tower and passed through the feeding device to ensure that the grain dryer is always at full load during operation.
The combined effect of the inward-turned bottomless V-shaped baffles and the multiple rows of V-shaped baffles staggered with the processing allows the processed products to be mixed. It also serves as an inlet and outlet channel for dry air.
The fan sends the used gas to It enters the collector and is purified, and most of the dry air can be recycled, so this grain drying tower consumes very little fuel.

What are the 5 advantages of grain dryers?

1. Advanced structural design, high heat exchange efficiency, and low drying cost. The air heat exchanger adopts finned tube heat exchange.
2. The grain drying tower adopts multi-air duct, multi-stage drying, multi-stage slow drying, forward and counter flow, and angular box drying technologies. It has a good drying effect on high-humidity materials, fast drying speed, uniform heating, and fluidity in the tower. good.
3. The material after drying in this grain drying tower has good color, a low breakage rate, and no cracks. High-moisture materials containing more than 35% water can be reduced to standard moisture at one time.
4. The grain drying tower automatically discharges grain, and the grain discharge mechanism is easy to adjust and trouble-free.
5. The grain drying equipment has low investment costs and low power consumption.

Sugar rotary drum dryer

The white sugar drum dryer has a wide operating range, strong practicability, and a large processing range. It is a dryer equipment that is currently favored by users. At present, drum dryers can be customized according to current user requirements. This equipment is mainly used in metallurgy, building materials, chemicals, coal washing, fertilizers, ores, sand, clay, kaolin, sugar and other fields. However, the sugar rotary drum dryer has a high requirement for the surface treatment of the dryer.

Structure and working principle of food safe standard sugar dryer

The drum dryer is mainly composed of a rotary body, a lifting plate, a transmission device, a support device, a sealing ring, and other components. The dryer is a cylinder that is slightly inclined to the horizontal direction.
The materials are added from the higher end. The high-temperature hot flue gas and the materials flow into the cylinder. As the cylinder rotates, the materials move to a higher level due to the action of gravity.
The inner wall of the cylinder is equipped with a lifting plate, which lifts and drops the materials, which increases the contact surface of the materials and the airflow, to improve the drying speed and forward the materials. The dried product is collected from the lower part of the bottom.

4 Features of sugar drum dryer

Fast processing speed, large processing capacity, and low fuel consumption.
Low cost, safe to use, and has certain protective measures.
The shape design uses a tug wheel and a rolling ring to make it stronger.
The specially designed blocking wheel structure greatly reduces the horizontal thrust caused by the tilting operation of the equipment. It has strong overload resistance, smooth cylinder operation, and high reliability.
The whole dryer is made of SS304 which no impurity content will be mixed with the sugar to ensure food safety.

Rotary kiln drum dryer used in the factory

Rotary drum dryers have many names in the industry. They are often called drum drying equipment or cylinder dryers. Cylinder drying equipment is the most common and widely used drying equipment in mining equipment. It is mainly suitable for drying metals and non-golds. The rotary drum dryer is suitable for magnetic, heavy, and floating concentrates of minerals, clay in the cement industry, and coal slime in the coal mining industry.

Product feature and working principle

The rotary drum dryer is mainly composed of a rotary body, a lifting plate, a transmission device, a support device, a sealing ring, and other components. The distribution and angle of the lifting plate are reasonably designed and the performance is reliable, so the heat energy utilization rate is high and drying is uniform; to control the temperature of the dryer, a thermocouple is configured on the inlet and outlet device, and the temperature of the inlet and outlet of the dryer can be displayed through a thermometer. Changes provide a basis for better controlling the operating temperature in the cylinder (generally 350-380 degrees).

How does a rotary dryer operate?

The dried wet materials are sent to the hopper of the drum dryer by a belt conveyor or bucket elevator and then enter the feeding end through the feeding pipe through the feeding machine of the hopper.
The dryer cylinder is a rotating cylinder, which is slightly inclined with the horizontal line. Materials are fed in through the higher end, heat carrier enters through the lower back and contact with materials in a counter-flow direction. Sometimes heat carriers and materials enter into the cylinder in parallel flow.
As the cylinder rotates, the materials move to the lower end due to gravity. As the wet materials move forward in the cylinder, they receive heat from the heat carrier directly or indirectly, so that the wet materials can dry, and then are discharged.
The end is sent out via a belt conveyor or screw conveyor. The inner wall of the barrel is equipped with a lifting plate, which can lift the materials and scatter them, increasing the contact surface of the materials and the airflow, to improve the drying rate and forward the materials advancement.
Heat carriers are generally divided into hot air, flue gas, etc. After the heat carrier passes through the dryer, a cyclone dust collector is generally required to collect the materials in the gas. If you need to further reduce the dust content of the exhaust gas, it should be discharged after passing through a bag dust collector or wet dust collector.

Energy saving three pass cylinder rotary drum dryer

The three-cylinder dryer is an efficient and energy-saving product improved on the single-cylinder rotary dryer. It has been applied by many companies and industries and has achieved good results. The three-cylinder dryer is a relatively energy-saving dryer among dryer equipment. It has a simple internal structure and consumes less energy. It has become a favorite among users and greatly improved labor productivity. It is currently mainly used in slag and clay in various industries. , coal, iron powder, ore powder and other mixed materials, dry mixed mortar in the construction industry, yellow sand, etc., as well as drying of raw materials in the chemical industry, casting, and other industries.

Working principle of three-pass rotary dryer

The three-cylinder dryer is the same as other dryer equipment. The material enters the inner layer of the rotary drum from the feeding device to achieve downstream drying. The material is continuously picked up and scattered under the lifting plate on the inner layer to achieve heat transfer in a spiral manner.
The material moves to the other end of the inner layer and enters the middle layer for counter-current drying. The material is continuously and repeatedly lifted in the middle layer in a two-step forward and one-step forward manner. The material in the middle layer fully absorbs the heat emitted by the inner drum. , and absorbs the heat of the middle drum, and at the same time prolongs the drying time, and the material reaches the best drying state here.
The material travels to the other end of the middle layer and falls into the outer layer. The material travels in a rectangular multi-circuit manner in the outer drum. The material that has reached the drying effect travels quickly and is discharged from the drum under the action of hot air.
The wet material that has not reached the drying effect cannot be quickly discharged due to its weight. Traveling, the materials are fully dried in this rectangular lifting plate, thereby completing the drying purpose.

Features of three-way dryer:

High technology content, the cylinder is self-insulating, the thermal efficiency is as high as 80% (the thermal efficiency of a single-cylinder dryer is only 35%), it saves 68% of coal than single-cylinder drying, and increases the output by 100%.
The overall length is 60% shorter than that of the rotary drum dryer, which is conducive to process layout. Reduce the building area of the factory and save about 40% of the project investment. It covers an area of about 20m2.
It adopts a heat-resistant and wear-resistant alloy steel plate, which is 4 times more wear-resistant than ordinary steel plate. Long service life and easy maintenance.
High thermal efficiency, the outer cylinder temperature is lower than 60℃ (the outer cylinder temperature of a single-cylinder dryer is as high as 150℃), the outlet temperature is low, and the discharge temperature is lower than 60℃.
The outlet temperature is low, which is beneficial to the long service life of the dust removal equipment and can be directly matched with the air box pulse bag dust collector.
Civil construction investment is reduced by about 50%, and power consumption is reduced by 60%.
There is no need for large and small gears to rotate, and the supporting wheel is used to rotate.
The hot blast furnace can be used with boiling furnaces, coal-fired furnaces, and hand-fired furnaces, and can also be used in oil and gas furnaces. It can bake block materials, granular materials, and powdery materials below 20 mm.

brewer grain rotary dryer

The distiller’s grain dryer can quickly dehydrate and dry the wet brewer’s grain with a moisture content of about 85% to a dry product with a moisture content of about 10%. Currently, this set of equipment has been put into use by many domestic beer companies and feed processing companies. , and create considerable economic benefits. This equipment can solve the problem that wet distiller’s grains are easy to deteriorate and cannot withstand transportation and storage. It can not only reduce environmental pollution but also increase the economic benefits of the brewery.

What is the working principle of a wine grain dryer

The distiller’s grain dryer is mainly composed of a heat source, a loading machine, a feeder, a rotary drum, a discharging machine, an induced draft fan, an unloader and a power distribution cabinet; after the dehydrated wet brewer’s grain enters the dryer, it is When the evenly distributed lifting plates in the drum are turned, they are evenly dispersed in the dryer and fully contacted with the hot air, which speeds up drying heat transfer and mass transfer. During the drying process, the beer grains are discharged to the star-shaped discharge valve in the other section of the dryer under the action of the inclined lifting plate and the heat medium to discharge the dried finished product.

Cow dung/chicken organic matter rotary kiln dryer

The cow dung dryer/chicken dung dryer has a high drying intensity and can directly dry poultry and livestock manure with a moisture content of 70%-80% into pure cow dung organic fertilizer with a moisture content of 13% in one go. Suitable for large, medium, and small cattle farms, chicken farms, and areas with relatively developed breeding industries. Qianli Company’s cow manure dryer/chicken manure dryer can use different heat sources according to the properties of the materials to be dried, such heat sources can be steam, electric heating, hot air stove, etc.

How does the cow dung/chicken manure dryer work?

The cow dung dryer/chicken dung dryer is mainly composed of a heat source, a loading machine, a feeder, a rotary drum, a material crushing device, a discharging machine, an induced draft fan, an unloader, a power distribution cabinet; after the dehydrated wet material is added to the dryer equipment, it is Under the flipping of the evenly distributed plate copying device, the materials are evenly dispersed in the dryer and fully contacted with the hot air, which speeds up drying heat transfer and mass transfer. During the drying process, the materials are discharged to the star-shaped discharge valve in the other section of the dryer under the action of the inclined lifting plate and hot air.