Three-drum Dryer

What is Three-Drum Dryer?

The three-drum dryer, also known as the three-cylinder dryer or triple-drum dryer, is an improved version of the single drum dryer. It incorporates modern and advanced German technology. This type of dryer consists of three concentric circles with different diameters arranged in a nested configuration. The triple-drum dryer offers improved sealing technology and is equipped with more advanced machinery compared to traditional drum dryers.

The three-drum dryer is designed to dry granular materials with a specific moisture content and particle size range. It can be used for drying materials such as clinker, sand, molding sand, slag, cinder, fine-grained clay, and high-temperature resistant and dusty particles. The dryer provides efficient and effective drying capabilities for these materials.

Three-Drum Dryer

Applications of Three-Drum Dryer

The three-drum dryer finds its applications in various industries including building materials, metallurgy, ore dressing, chemical, cement, and more. It is suitable for drying a wide range of particles and powders in these sectors. Some examples of its applications are:

Dry mortar industry: It is used for drying yellow sand and all-sized artificial sand used in the production of dry mortar.
Foundry industry: It is utilized to dry blast surface slag, limestone, and quartz/silica sand, which are commonly used in the production of building materials and cement.
Chemical industry: It can dry various materials such as waste slag, concentrate, and tailings in chemical processes.
Coal industry: It is used to dry coal slime, raw coal, flotation coal concentrate, and mixed coal in the coal industry.
Other applications: The three-drum dryer can be used to dry wet granular materials like metal powder, fly ash, river sand, gypsum, and other similar materials.
In summary, the three-drum dryer has versatile applications in different industries, providing efficient drying solutions for a variety of materials.

 

Three-Drum Dryer Application

How Three-Cylinder Dryer Works?

The three-cylinder dryer operates using a combination of radiation, convection, and heat conduction to effectively dry materials. The dryer is positioned at a specific angle to take advantage of gravity in the process.

Here is an overview of how the three-cylinder dryer works:

Heating: The hot air inside the dryer reaches the desired temperature. The drying process starts when the PC system initiates the dryer.

Material Input: Wet particles are uniformly fed into the inner layer of the dryer by a feeder. The particles then mix with the hot air and are carried through the dryer.

Spiral Movement: The wet material moves spirally along the inner layer due to the presence of fixed shoveling plates. This movement ensures thorough contact between the material and the hot air.

Middle Layer: The material gradually moves towards the other end of the dryer, entering the middle layer. In this section, the material moves against the airflow, allowing for efficient utilization of heat from the inner and middle layers. This maximizes the drying efficiency.

Outer Layer: After leaving the middle layer, the material travels into the outer layer in a rectangular and multi-loop mode. Granular material that has reached the desired moisture content is discharged from the dryer. The remaining material, which still requires further drying, moves more slowly in the outer layer due to its weight. It goes through an additional drying process to achieve the required humidity level.

By following this process, the three-cylinder dryer effectively dries the material, resulting in the desired moisture content and facilitating the drying process.

Working Principle of Three-Cylinder Dryer

Compared to traditional dryers, the three-drum rotary dryer offered by Zoneding has several structural benefits, including:

Low Discharging Temperature: The three-drum dryer has a discharging temperature of less than 50 degrees Celsius. This means that the dried material can be directly discharged into a base or storage area without the need for additional cooling. Furthermore, the low discharging temperature helps prolong the service life of the dust collecting system.

No Wind Leakage: The design of the three-drum dryer eliminates the issue of wind leakage, ensuring efficient operation and solving the challenge of sealing difficulty. As a result, the dryer can be easily installed within two hours.

High Thermal Efficiency: The three-drum dryer achieves a high thermal efficiency of up to 80%. This is a significant improvement compared to traditional single-cylinder drying machines, which typically have a thermal efficiency of only 32%. The increased thermal efficiency of the three-drum dryer translates to a 48% improvement, leading to energy savings and reduced operating costs.

Reduced Occupied Area: The three-drum dryer requires approximately 50% less space compared to single drum dryers. This reduction in the occupied area can significantly decrease land investment requirements for the drying operation.

Energy Savings: The three-drum rotary dryer consumes approximately 1/3 of the coal consumed by a single-cylinder dryer, resulting in a 40% energy saving. The standard coal consumption for processing each ton of material is less than 9 kg. This energy efficiency can lead to substantial cost savings and environmental benefits. For small drying machines, the annual coal saving is estimated to be between 50-100 million, while large dryers can save 100-200 million annually.

Overall, the structural benefits of the Zoneding three-drum rotary dryer offer improved efficiency, energy savings, and reduced land and operating costs compared to traditional dryers.

How to Choose a Suitable Dryer?

Choosing the right type of dryer can be confusing for customers, especially when considering options like single drum dryers and three-drum drying machines. To clarify the selection process, let’s discuss the factors to consider when choosing a suitable dryer:

Capacity: Determine the required drying capacity in terms of the amount and moisture content of the material to be dried. If you have a large volume of material or need to dry material with high moisture content, a three-drum dryer may be more suitable due to its higher thermal efficiency and larger capacity.

Space Constraints: Assess the available space for installing the dryer. If you have limited space, a single drum dryer may be preferable as it occupies less area compared to a three-drum dryer. However, if space is not a constraint, a three-drum dryer can offer enhanced efficiency and productivity.

Energy Efficiency: Consider the energy consumption and efficiency of the dryer. A three-drum dryer tends to have higher thermal efficiency compared to a single drum dryer, resulting in better energy savings over time. Assess your energy requirements and goals to make an informed choice.

Material Characteristics: Evaluate the specific properties of the material to be dried, such as size, shape, and sensitivity to heat. Certain materials may require a specific type of dryer. For instance, an air-flow dryer might be ideal for heat-sensitive materials that require gentle drying.

Budget: Assess your budget constraints and compare the costs associated with different types of dryers. Evaluate the initial investment, operating costs, and potential savings in terms of energy consumption and maintenance.

Ultimately, the choice between a single drum dryer and a three-drum dryer depends on your specific requirements, such as capacity, space constraints, energy efficiency goals, material characteristics, and budget considerations. By carefully evaluating these factors, you can select the most suitable dryer for your needs.

	Single Drum Dryer	Three Drum Dryer
Diameter of Outer Cylinder(m)	1.2-3.6	2.5-3.6
Length(m)	8.0-28.0	7.0-8.0
Volume(m3)	9.0-285.0	16.63-81.38
Capacity(T/H)	1.9-76.0	Yellow Sand: 25-70Slag: 20-65

Based on the provided information, the following points can be summarized regarding choosing between a single-drum dryer and a three-drum dryer:

Single-drum dryer:

Larger capacity and lower price compared to a three-drum dryer.
Easier operation and maintenance.
Suitable for situations where larger capacity and simpler operation are required.
Three-drum dryer:

Takes up less space compared to a single-drum dryer.
Better utilization of heat.
Lower energy consumption compared to a single-drum dryer when occupying the same space.
Ideal for situations where space efficiency and energy consumption are important factors.
In summary, if space efficiency and energy-saving capabilities are key considerations, the three-drum dryer would be the best choice. On the other hand, if larger capacity and ease of operation are more critical, the single-drum dryer would be a suitable option.

Three-Drum Dryer VS Single-Drum Dryer

Three-Cylinder Dryer at Customer Site

General Specification

Item/Unit/Model	Φ2.5×7m	Φ2.7×7m	Φ3.0×7.0m	Φ3.2×7.0m	Φ3.6×8m
Diameter of outer cylinder(m)	2.5	2.7	3.0	3.2	3.6
Length of outer cylinder(m)	7	7	7.0	7.0	8
Cylinder volume( m³ )	16.63	16.63	52.678	52.678	81.38
Rotating speed of cylinder(rpm)	4-10	4-10	4 -10	4 -10	4 -10
Initial moisture of slag(%)	10-12	10-12	10-12	10-12	10-12
Final moisture of slag(%)	1	1	1	1	1
Initial moisture of yellow ground(%)	8-10	8-10	8-10	8-10	8-10
Final moisture of yellow ground (%)	0.5-1	0.5-1	0.5-1	0.5-1	0.5-1
Highest intake air temperature(℃)	700-750℃	700-750℃	700-750℃	700-750℃	700-750℃
Production capacity(T/h)	Yellow sand: 25-30 Slag: 20-25	Yellow sand: 30-35 Slag: 25-30	Yellow sand: 35-40 Slag: 30-35	Yellow sand: 45-50 Slag: 35-40	Yellow sand: 65-70 Slag: 60-65
Motor type	Y2-132m-4E	Y2-132m-4E	Y2-160m-4	Y2-160m-4	Y2-160m-4
Motor power(kw)	7.5×2	11×2	7.5×4	7.5×4	15×4
Reducer type	XWD7-23-11W	XWD7-23-11W	XWD6-23-7.5KW	XWD6-23-7.5KW	XWD8-23-15KW
Velocity ratio of reducer	29	29	29	29	29

Please note that the information provided is subject to change as technology improves, and we reserve the right to make changes without prior notice. Additionally, the performance of the machines may vary depending on the specific application. For more detailed and up-to-date information, we recommend chatting online with Zoneding engineers who can provide more specific guidance based on your specific requirements.