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Rotary Dryer

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Rotary Dryer

ico 1 Processing capacity: 10-30 t/h

ico 2 Cylinder volume: 9.0-285 m³

Applied materials : slag, blast furnace slag, fly ash, cinder, slag, carbide slag, limestone, clay, sand, quartz sand.

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Introduction of rotary dryer and its type

Rotary dryer is also called a rotary drum dryer or drum dryer. It is the most common and widely used mining equipment for material drying.

Based on the structure, rotary dryers can be divided into two different types: single-cylinder dryer and multi-cylinder dryer.

During their practical applications, because the structure is more complicated, multi-cylinder dryers are difficult to maintain. Also, its materials are easily clogged when the moisture is high. Therefore, single-cylinder dryers are the most popular type in the market.

And according to the heat transfer mode between the drying medium and the wet material, the rotary dryer can be also divided into two different types: direct-heat rotary drum dryer and indirect-heat rotary drum dryer.

The heating medium of the indirect-heat rotary drum dryer is not contacted with the material directly. All the heat required is transferred to the material through the heat transfer wall. While the material directly contacts with the internal heating medium, and mainly dried by convective heat transfer. Thus, the latter is used more widely.

So, the rotary dryer here mainly refers to single-cylinder and direct-heat rotary dryer.

Applied field

Rotary dryer is mainly used to dry materials of certain moisture or granularity in such areas as ore beneficiation, building materials, metallurgy, and chemical industry.

The material granularity is generally not larger than 50 mm. And with the strong adaptability to materials, it can process varieties of materials. Besides, because of its simple and reliable structure, the rotary dryer is the most popular equipment for drying.

The rotary dryer manufactured by Fote Heavy Machinery (FTM) is carefully designed for the materials in the mining industry and drying material moisture to below 12%.

It can not only dry magnetic, heavy and floating concentrates of metal and non-metallic ore, but also dry clay in the cement industry and slime in the coal industry. Besides, it can be used for drying powder and granular with special requirements, such as various crystals, light calcium carbonate, activated clay, magnetic powder, graphite, etc.

Applications of rotary dryer

Applications of rotary dryer

Structure and matters to be noticed during installation

The structure of a rotary dryer can be divided into five parts: the inlet and outlet hood, drum (cylinder), supporting device, transmission device, and auxiliary equipment.

  • There are usually bolted seals used in the places where the inlet and outlet hoods connect with the cylinder. With good elasticity and heat resistance, it is used to seal the entire device to reduce heat loss.
  • The drum of the rotary dryer is welded from a whole steel coil.There are spiral plates, lifting board and material blocking ring in the drum.

    1. The spiral plate is at the feeding port for feeding easily.

    2. In the middle of the drum, there are lifting plates welded. By changing the angle of the lifting plate, the height of the lifting material can be reduced to avoid the deformation of the material.

    3. The material blocking ring is welded in the discharge to prevent the material haven't met the drying requirements from being thrown out.

  • The supporting device includes two parts: two sets of riding wheels and a set of catch wheels (one set of two). The role of the blocking wheel is to prevent the longitudinal movement of the drum.
  • The transmission device includes a motor, reducer, small gear, and the main gear. The motor drives the cylinder through a V-belt, a reducer, a pinion, and the main gear to perform the rotary motion.
  • The auxiliary equipment contains a feeder, conveyors for feeding and discharging, an induced draft fan, a hot-blast stove, and a dust collector.

Structures of rotary dryer

Structures of rotary dryer

And matters to be noticed during installation are as following:

  • The supporting device of the cylinder should be installed on the horizontal concrete foundation and fixed with anchor bolts.
  • The drum should be placed to be vertical with the horizontal and the gap to the blocking wheel is controlled within 5mm.
  • The angle between the drum and the horizontal line needs to be at 5 °, which is more convenient for the discharge of finished products.
  • The groove of the bracket needs to be filled with water and oil to cool and lubricate the riding wheels and belts.
  • For open-air projects in rainy areas, in order to preserve heat, reduced heat loss and protect the drum being corroded, insulating cotton and galvanized sheet can be added outside the cylinder.

Installed rotary dryer in site

Installed rotary dryer in site

Working principle

The material is sent to the hopper by the belt conveyor or bucket elevator and then enters the drum through the feeding pipe of the hopper. Because of the inclination angle of 5 ° to the horizontal, the material can naturally flow into the drum.

During the rotation, the material can be both heated by the cylinder and the heated air. The moisture content will be reduced with the water evaporating.

Working principle of rotary dryer

Working principle of rotary dryer

Points to be paid attention to during the operation

  • Fixed fuel consumption and material feed quantity: The large adjustment will cause the moisture content of the discharge fluctuating, which will not meet the product quality requirements.
  • If the gears make abnormal sounds during operation, pay attention to check the mesh interspace of the gears.
  • The pinion should be replaced in time when it is severely worn.
  • The main gear should be protected with a cover from dust entering. And thick gear oil or black oil should be added to the gear cover for lubrication.
  • Select the proper drying temperature according to the material characteristics. Generally, the drying temperature of ore and sand materials is 700-800 ℃.
    While some materials need to be dried at low temperatures of not exceeding 300 ℃, such as wood chips, gypsum, etc.

To achieve the perfect drying effect and reduce investment costs, besides paying attention to equipment installation and operation, selecting a high-quality equipment manufacturer at the very beginning is a top priority.

Why choose Fote rotary dryer

Being a mining machinery manufacturer with more than 37 years of experience, Fote Heavy Machinery has been persisting in exploring and designing higher-quality mining equipment with more advanced technology.

FTM rotary dryer designed under the aim of customers' benefits is not only in high-mechanized, strong-capacity, but also runs smoothly and continuously. And its failure rate is lower than any others.

Advantages of Fote rotary dryer

Advantages of Fote rotary dryer

The specific advantages are as follows:

High-quality structure with simple design

Simple operation with new internal structure, FTM rotary dryer strengthens the cleaning and heat conduction of the dispersed materials and solves the problem of the sticking phenomenon on the inner wall. So, it has stronger adaptability to the moisture and viscosity of the materials

With a complete dust collector device, the system has a better sealing performance. it can reduce dust spillage effectively and achieve a good operating environment.

High drying intensity and drying efficiency

Maximize the use of hot air: Choosing the LX multi-combination lifting plate to make the material enter the drying drum like rain curtain, which increases the contact surface between the material and the hot air.

Increase contact surface with hot air: The hot air in high velocity makes the material well dispersed in the drum. The entire surface of the material can be used as an effective area for drying, which can improve the drying efficiency largely.

Parts are wear-resistant

With the structure design reasonable and lubrication methods various, the ridding wheels are not easy to be worn out, which shortens the replacement cycle and increases the using time.

The drum is made of a while piece of steel, which has higher hardness and toughness. And its wear resistance is higher than any other materials.

Customer case – Rotary dryer sold in Malaysia

Sawdust is also called wood chips. Being used to make biomass fuel, it can not only realize waste recycling but also reduce environmental pollution effectively. The wet wood chips can be reused after crushing-grinding-drying-granulating-packaging.

According to the survey, every 10,000 tons of wood chips can replace 80,000 tons of standard coal, which can reduce emissions of 160 tons SO2, 80 tons smoke and dust, and 14,400 tons CO2.

Rotary dryer in site in Malaysia

Rotary dryer in site in Malaysia

A customer from Malaysia visited our website in March 2019 to purchase complete equipment for wood chips drying. Fote engineers provided suitable equipment according to the project information provided. They are satisfied with the plan and quotation. After visiting our factory, they decided to buy the whole set.

Here is the project information:

Processing materials: Sawdust

Initial humidity: 8%-10%

Final humidity: 1%

Production capacity: 15 t/h

Maximum temperature: 300 °C

Auxiliary equipment: Feeder, feed conveyor, discharge conveyor, induced draft fan, hot blast stove, and cyclone.

Parameter

Spec./m
(Dia.×Length)
Shell Cubage
(m³)
Capacity
(t/h)
Installation
Obliquity
(%)
Highest Inlet
Air Temperature
(℃)
Main Motor
(kw)
Weight
(t)
Φ1.2×8.0
9.0
1.9~2.4
3~5
700~800
7.5
9
Φ1.2×10
11.3
2.4~3.0
3~5
700~800
7.5
11
Φ1.5×12
21.2
4.5~5.7
3~5
700~800
15
18.5
Φ1.5×14
24.7
5.3~6.6
3~5
700~800
15
19.7
Φ1.5×15
26.5
5.7~7.1
3~5
700~800
15
20.5
Φ1.8×12
30.5
6.5~8.1
3~5
700~800
18.5
21.5
Φ1.8×14
35.6
7.6~9.5
3~5
700~800
18.5
23
Φ2.2×12
45.6
9.7~12.2
3~5
700~800
22
33.5
Φ2.2×14
53.2
11.4~14.2
3~5
700~800
22
36
Φ2.2×16
60.8
13.0~16.2
3~5
700~800
22
38
Φ2.4×14
63.3
13.5~16.9
3~5
 
700~800
37
45
Φ2.4×18
81.4
17.4~21.7
3~5
700~800
37
49
Φ2.4×20
90.4
19.3~24.1
3~5
700~800
45
54
Φ2.4×22
99.5
21.2~26.5
3~5
700~800
45
58
Φ2.6×24
127.4
27.2~34.0
3~5
700~800
55
73
Φ3.0×20
141.3
30.1~37.7
3~5
700~800
75
85
Φ3.0×25
176.6
37.7~47.1
3~5
700~800
75
95
Φ3.2×25
201
42.9~53.6
3~5
700~800
90
110
Φ3.6×28
285
60.8~76.0
3~5
700~800
160
135

Technical parameters of indirect heat dryer:

  Shell 
diameter
×shell 
Length  
Items
Inside 
diameter 
of outer 
shell
(mm)
Inside 
diameter 
of inner 
shell
(mm)
Shell
 Length
(m)
Shell
 cubage
(m³)
Shell 
obliquity
Lifting 
blade
 form
Highest 
inlet air
 temperature
(℃)
Dimensions
(m)
Φ1.5×15m 1500 500 15 20.27 3-5% Lifting form 850 16.2×2.7×2.7
Φ1.5×17m 17 22.97 18.2×2.7×2.7
Φ1.5×19m 19 25.68 20.0×2.9×2.9
Φ1.8×21m 1800 650 21 35.91 3-5% Lifting form 850 22.5×2.7×2.7
Φ1.8×23m 23 39.33 24.5×2.9×2.9
Φ1.8×25m 25 42.75 26.5×2.9×2.9
Φ2.2×21m 2200 800 21 58.10 3-5% Lifting form 850 ----
Φ2.2×23m 23 63.61
Φ2.2×25m 25 69.15
Spec./m
(Dia.×Length)
Shell Cubage
(m³)
Capacity
(t/h)
Φ1.2×8.0
9.0
1.9~2.4
Φ1.2×10
11.3
2.4~3.0
Φ1.5×12
21.2
4.5~5.7
Φ1.5×14
24.7
5.3~6.6
Φ1.5×15
26.5
5.7~7.1
Φ1.8×12
30.5
6.5~8.1
Φ1.8×14
35.6
7.6~9.5
Φ2.2×12
45.6
9.7~12.2
Φ2.2×14
53.2
11.4~14.2
Φ2.2×16
60.8
13.0~16.2
Φ2.4×14
63.3
13.5~16.9
Φ2.4×18
81.4
17.4~21.7
Φ2.4×20
90.4
19.3~24.1
Φ2.4×22
99.5
21.2~26.5
Φ2.6×24
127.4
27.2~34.0
Φ3.0×20
141.3
30.1~37.7
Φ3.0×25
176.6
37.7~47.1
Φ3.2×25
201
42.9~53.6
Φ3.6×28
285
60.8~76.0

Technical parameters of indirect heat dryer:

  Shell 
diameter
×shell 
Length  
Items
Inside 
diameter 
of outer 
shell
(mm)
Inside 
diameter 
of inner 
shell
(mm)
Shell
 cubage
(m³)
Φ1.5×15m 1500 500 20.27
Φ1.5×17m 22.97
Φ1.5×19m 25.68
Φ1.8×21m 1800 650 35.91
Φ1.8×23m 39.33
Φ1.8×25m 42.75
Φ2.2×21m 2200 800 58.10
Φ2.2×23m 63.61
Φ2.2×25m 69.15
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