Straight-fired high efficiency rotary drying equipment RFQ
Introduction
A rotary drum dryer is an essential piece of equipment for handling large volumes of materials. Its reliable operation, versatile functionality, strong adaptability, and high processing capacity make it indispensable in industries such as metallurgy, building materials, food, light industry, chemical industry, coal, pharmaceuticals, and mining.
Benefits and Applications
Rotary drum dryers are ideal for granular materials and can also handle sticky paste materials or those with high moisture content by partially mixing them. The key benefits include:
- Large production capacity
- Wide applicability
- Low flow resistance
- High operational flexibility
- Easy operation
Components of a Rotary Drum Dryer
A typical rotary drum dryer consists of several key components:
- Cylinder/shell
- Front Roller/supporting roller
- Ring Rear/girth gear
- Retaining Roller/thrust roller
- Drag Roller
- Pinion/small gear
- Discharge Part/hood cover
- Lifting Plate/flights
- Reducer/gearbox
- Motor
- Hot Air Duct
- Feeding Chute
- Furnace Body/hot air generator
Additional components can include a combustion chamber, supporting elevator, belt conveyor, quantitative feeder, cyclone dust collector, and induced draft fan, depending on user needs.
Working Principle of Rotary Drum Dryer
The operation of a rotary drum dryer involves several stages:
- Feeding Materials: Wet materials are delivered to the hopper via a belt conveyor or bucket elevator, then enter the feeding end through the feeding pipe.
- Material Flow: The feeding pipe’s inclination should exceed the natural inclination of the materials to ensure smooth flow into the dryer. The rotating cylinder, slightly inclined from the horizontal, facilitates the movement of materials from the higher end to the lower end.
- Heat Exchange: Heat carriers, introduced from the lower end, contact the materials in a counter-flow manner. In some cases, both materials and heat carriers flow together.
- Drying Process: As the cylinder rotates, gravity moves the materials forward. The heat from the heat carrier dries the materials either directly or indirectly. Dried materials are then discharged through a belt or screw conveyor.
- Lifting and Scattering: The inner wall of the cylinder has lifting plates that lift and scatter the materials, increasing their contact surface with the airflow and enhancing the drying rate.
- Heat Carrier and Dust Collection: Heat carriers usually consist of hot air or flue gas. After passing through the dryer, a cyclone dust collector captures the materials in the gas. For further dust reduction, the exhaust gas may pass through a bag dust collector or wet dust collector before being discharged.
Double Drum Dryer Performance Table
| Model | Inclination | RPM | Temperature | Power:(kw) | Capacity:(t/h) | Weight:(t) |
|---|---|---|---|---|---|---|
|
ZJTL2000 |
3~5 |
2.0~3 |
800 |
22 |
20~25 |
50 |
|
ZJTL2400 |
3~5 |
1.5~2.5 |
800 |
37 |
25~30 |
65 |
|
ZJTL3000 |
3~5 |
1~1.5 |
800 |
75 |
30~35 |
90 |
Working Principle of Rotary Drum Dryer
A Comprehensive Guide When selecting a rotary drum dryer, it’s essential to understand the specific characteristics and requirements of the dryer to ensure it meets your needs effectively. Here are the key factors to consider:
1. Adaptability to Dry Materials
Ensure the dryer can achieve the desired level of dryness and uniformity for your materials. The ability to consistently produce a uniform product is crucial for maintaining quality.
2. Preservation of Product Quality
Consider whether the dryer maintains the quality of your product. Some materials require the preservation of their crystal shape, color, or structural integrity during the drying process. Choose a dryer that minimizes damage, deformation, or cracking of the product.
3. Thermal Efficiency
The thermal efficiency of the drying device is a critical technical and economic indicator. High thermal efficiency means better utilization of thermal energy, leading to cost savings and improved performance. A dryer with low thermal efficiency will result in higher energy consumption and operating costs.
4. Economical Processing Capacity
Evaluate the drying equipment’s processing capacity, production intensity, and drying rate. High drying intensity implies that the equipment needed is smaller, reducing fixed investment costs. Conversely, lower drying intensity requires larger equipment, increasing costs.
5. System Resistance and Mechanical Energy Consumption
The resistance of the drying system affects mechanical energy consumption. Lower system resistance leads to reduced energy consumption and lower operating costs. Ensure that the drying system’s resistance is manageable to maintain economical operation.
6. Auxiliary Equipment Requirements
Consider the auxiliary devices needed for the dryer. Some dryers, like fluidized bed dryers or airflow dryers, require effective dust separation, reliable ventilation, and efficient wet material supply systems. Even if the dryer itself is compact, the need for extensive auxiliary equipment can limit its application.
7. Ease of Operation and Control
Select a dryer that is user-friendly, easy to operate, and control. Good working conditions and straightforward maintenance procedures are vital for efficient and hassle-free operation.
By carefully considering these factors, you can choose a rotary drum dryer that meets your material drying needs, maintains product quality, and operates efficiently and economically.
Selection of heat Carrier for rotary drying equipement
Choosing the appropriate heat carrier and its maximum temperature depends on factors such as the nature of the solid material being processed and its tolerance for contamination. If the material can withstand high temperatures and is not the final product, slight contamination during processing might be acceptable. In such cases, flue gas can be used as the heat carrier to achieve higher volume evaporation rates and thermal efficiency.
For instance, when drying materials with high moisture content, using a gas inlet temperature of 300°C can yield a volume evaporation rate of 5 kg/m³/h and thermal efficiency of 30%-50%. Increasing the gas inlet temperature to 500°C can boost the volume evaporation rate to 35 kg/m³/h and thermal efficiency to 50%-70%. Therefore, drum dryers handling materials like ore, sand, coal, and superphosphate sulfate often use a combustion furnace to directly generate flue gas, with fuel sources including coal, oil, and natural gas.
For materials that must remain uncontaminated, hot air is used as the heat carrier. The hot air is typically heated by an air preheater, using a steam heater, electric heater, or flue preheater. Alternative methods such as industrial waste hot air can also be employed. Indirect heating, where heat is transferred from a metal wall to the material, is another option, exemplified by externally heated drum dryers.
If the material cannot be contaminated or diluted by air, heat transfer should occur through the drum wall. In this setup, the drum is placed inside a brick chamber, with flue gas passing outside the drum. Alternatively, surface heat exchangers like central pipes or casings can be installed inside the drum to transfer heat via metal walls. Suitable heat carriers in these cases include flue gas, water vapor, or electric heating. Only clean gas should be used to remove evaporated water from the dried materials.
In conclusion, selecting the right heat carrier should align with the material requirements and local resources to optimize production efficiency and economic benefits.
Straight fire dryer Installation guide
- Preparation: Before installation, determine if the equipment room will house the dryer alone or if it will share space with connected machinery. Consider the location of the machine and the choice and setup of the heat transfer medium.
- Inspection: Ensure all screws on each component are tightened, check the flexibility of sliding parts, and verify that the reducer and lubrication points are properly lubricated.
- Foundation Setup: Adjust the foundation height according to specific requirements and geographic location, and ensure the dryer’s inclination is correctly aligned.
- Foundation Curing: Allow the cement foundation to fully cure based on seasonal temperatures and regional conditions, typically requiring 6-15 days.
- Operational Check: Prior to starting production, confirm the dryer is functioning properly, free from unusual noises, with a clear flue, and that all connected equipment is appropriately set up.
- Commencing Production: Begin feeding materials into the dryer only after all checks are complete and the system is confirmed to be operating normally.
