Rotary Dryer

A rotary dryer is an industrial device used to reduce the moisture content of materials through a rotating drum that applies heat.

• Dried Moisture(%): 12-15% (Adjustable)
• Capacity: 20-200 t/d
• Heat Source:biomass, natural gas, diesel, coal, etc.
• Application:Widely used for drying cow dung, chicken manure, cattle manure, pigeon dung and other poultry manure, etc.

What is Rotary Dryer?

The single cylinder rotary dryer is designed for drying bulk materials in various industries: building materials, metallurgical, chemical, glass, etc. On the basis of heat engineering calculations, we select the most optimal dryer size and design for customer requirements.

The capacity of the drum dryer is from 0.5 tph to 100 tph. According to the calculations, a loading chamber, a burner, an unloading chamber, a mechanism for dust collecting and gas cleaning are manufactured. The dryer adopts automation system and a frequency drive to adjust the temperature and rotation speed. This makes it possible to vary the drying parameters and overall performance within a wide range.

The Application of Rotary Dryer

Rotary dryer is suitable to dry metallic and non-metallic mineral, clay in cement industry and coal in coal mine etc. For example, sand, vinasse, slag ,sludge, coal powder, sawdust, limestone powder, rice husk, mineral powder , clay, etc.

This type of dewatering equipment is extensively applied for drying particles and granules no more than 5mm. If the material is too large, a small crusher machine is suggested for the first breaking.

For example,

  ◆ In cement plants, rotary dryers are used for dewatering fly ash, pozzolana, etc. to meet the requirements of cement production;
  ◆ In the recycling field, rotary dryers can be used for drying sludge and other similar waste. Such waste contains rich organic matters, which can be recycled as fertilizer.
  ◆ In mine, rotary dryers are mostly used in the ore beneficiation plants after the wet grinding process. The rotary dryer can dry the ore pulp after the pressure filter to get the fine powder.

Examples of Rotary Dryer Applications

Rotary Drum Drying Structure

Features:

1. According to the different materials to be dried, the suitable rotate cylinder structure could be selected.

2. Smooth and reliable operation.

3. Different heat sources are available: natural gas, diesel, coal, biomass particles, etc.

4. Intelligent temperature control.

Burning chamber
Provide space for fuel combustion, theend of the chamber is provided with anair inlet and an air regulating valve, andthe interior is built with refractory
cement and bricks, and the temperaturein the burning chamber can reach up to1200 C. lts structure is exquisite andreasonable, and it is closely combinedwith the dryer cylinder to providesufficient heat source for the dryer

The Classification of Rotary Drum Dryer

Given different structures and applications, the rotary drum dryer is divided into several types. And thus, drying technology is more targeted.

According to the structure, rotary dryers are divided into the single-cylinder type and multi-cylinder type.

Based on experience and customer feedback, Zoneding engineers will recommend the single-cylinder rotary dryer. These two types of rotary dryers have almost the same drying efficiency. While the structure of the single-cylinder one is simpler, resulting in more convenient daily maintenance. The maintenance personnel can directly get into the cylinder body for inspection. For multi-cylinder dryers, this is difficult to achieve.

Working site of single-cylinder rotary dryer and multi-cylinder rotary dryer

According to the heat transfer mode, the rotary dryer is divided into the direct type and indirect type, or it can also be divided into a co-current rotary dryer and counter-current rotary dryer.

Among them, the co-current rotary dryer and direct dryer are the most widely used. If the material quality is too small, to prevent material flowing back and cannot be dried, the co-current type must be used.

However, due to different materials and drying requirements, in the following cases, Zoneding engineers will also recommend counter-current rotary dryer and indirect one.
  ※When the moisture requirement of the product is below 5%, the higher drying efficiency of the countercurrent drum dryer can meet the more stringent drying requirements.
  ※Indirect heat transfer dryers are an option to prevent contamination of materials in contact with smoke or fire from direct combustion.

Working Principle of Rotary Dryer

The working principle of a rotary dryer is based on gravity and heat exchange. Let’s take the counter-current rotary dryer as an example to explain the process:

The wet materials that need to be dried are sent to the feeding hopper by a belt conveyor or a hoist, and then enter the material end through the feeding pipe. The slope of the feeding tube is greater than the natural inclination of the material, so that the material can enter the dryer smoothly. The dryer cylinder is a rotating cylinder slightly inclined from the horizontal line. The material is added from the higher end, and the heating medium is in contact with the material. With the rotation of the cylinder, the material moves to the lower end under the action of gravity. In the process, the material and the heat carrier exchange heat directly or indirectly, so that the material is dried, and then sent out through a belt conveyor or a screw conveyor.

Rotary Dryers Advantages

Although Zoneding offers rotary dryer with simple structure, considering that our customers are from small, medium and large factories, our dryer machines have the following advantages:

Others: easy maintenance; simple and easy operation.

The carefully calculated ratio of length and diameter controls the material retention time in the rotary dryer to ensure a satisfying drying effect. The designed angle of the lifting plates helps to increase the thermal contact area without damaging the materials, to improve the heat exchange efficiency;

Strong adaptability. Zoneding rotary dryer is simple in structure and can be designed for different materials to meet different requirements. Besides, the strong adaptability is also for different site requirements with an adjustable ratio of length and diameter;

The optional motor heat source and fuel. Customers can choose the right heat source and fuel for their dryers from the perspective of cost, environmental protection and so on. Dryers can be heated by oil, gas, wood and steam, etc. The fuel could be oil, electricity, etc.

Benefits of Rotary Dryer

General Specification

Drying Machine Production Process

Customer Site

FAQ

Q1. Who are we?
A1: Zoneding Machine is manufacture of mining machine which is located in Henan province of China. We have been professional on grinding mill, stone crushers, sand making machines, production line for ore beneficiation, sand and aggregate industries since 2004.

Q2. What is our main crusher products?
A2: Jaw Crusher/Cone Crusher/Vibrating Screen/Sand Making Machine/Mobile Stone Crusher Plant/Vibrating Feeder/Fine Sand Recovery Machine/Screw Sand Washing Machine/Impact Crusher/Vertical Shaft Impact Crusher/Hammer Crusher/Belt Conveyor/Stone Crushing Plant.

Q3. What about the price ?
A3: We are able to give you competitive price than market one cuz we are factory, and we have a policy that ” for saving time and absolutely honest” business attitude,we quote as low as possible for any customer, and discount can be given according to quantity

Q4. What services can we provide?
A4: Accepted Delivery Terms: FOB, CFR, CIF；
Accepted Payment Currency: USD,EUR, CNY;
Accepted Payment Type: T/T,L/C;
Language Spoken: English,Chinese,Spanish,Arabic,French,Russian

Q5: When will the delivery be?
A5: For inventory goods, we can ship them within 3-5 days. For customized equipment and other devices, we will specify according to clients’ needs as we quote.

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