Rotary Kiln Dryer
The Best Choices for Your Project
We supply industrial rotary kiln drying equipment
- Customization Service：The maximum customizable diameter is 3.5 meters
- Solution：Provide solutions for your problems
- Dryer length: 8 meters to 50 meters.
Rotary Kiln Dryer
A rotary kiln dryer is a type of drying equipment widely used in the building materials, metallurgy, and chemical industries. It is primarily used to dry powders and granules, and can handle materials with a moisture content of 75% or more. The rotary kiln dryer consists of a drum, rollers, transmission, and sealing system, along with a hot air furnace.
Hot air from the hot air furnace enters the rotary kiln drum for drying. The transmission drives the drum, and the rollers support it. After drying, the material is automatically discharged.
The main components include:
The rotary kiln drum: The core of the equipment, featuring an integrated design, is a circular drum constructed from welded steel plates. It can be up to 50 meters in length. Inside the drum, a lifting plate provides space for the material to come into contact with the hot air.
The roller: Fitted over the drum, it bears the weight of the drum, the material, and the liner, and transfers it to the rollers. Support Rollers and Stop Rollers:
Support rollers are the supporting devices of the rotary kiln, usually found in pairs. They support the rollers and ensure smooth rotation of the drum.
Stop Rollers are used to limit axial movement of the drum, ensuring that the equipment moves along its axis within the permitted range.
Transmission System: This system consists of a motor, a reducer, and large and small gears. The small gear drives the large gear mounted on the drum, thereby driving the entire drum to rotate at a constant speed.
Lifting Plate: Installed inside the drum. As the drum rotates, the lifting plate continuously scoops up and drops the material, forming a uniform curtain of material, significantly increasing the contact area between the material and the hot air and improving drying efficiency.
Seal Device: Installed at the feed and discharge ends of the drum, this device prevents the inhalation of cold air and the leakage of the internal heat medium, thereby ensuring system thermal efficiency and a stable working environment.
The feed and discharge devices, located at the upper and lower ends of the drum, respectively, are responsible for the continuous supply of material and the discharge of finished products.
Hot Blast Furnace/Burner: Provides the heat source required for drying, generating a high-temperature heat medium. Dust Removal Systems: These systems, such as cyclones and bag filters, collect dust entrained in the exhaust gas after drying to meet environmental protection requirements.
Specifications of Rotary Kiln Dryer
| Model (Diameter × Length, m) | Speed (r/min) | Slope (%) | Capacity (t/h) | Main Reducer Model | Ratio | Main Motor Model | Power (kW) | Speed (r/min) | No. of Supports | Weight (t) | Remarks |
|---|---|---|---|---|---|---|---|---|---|---|---|
| φ1.9/1.6×36 | 0.53–1.59 | 4 | 2.5–4 | JZQ750-1 | 45.58 | JZT-72-4 | 30 | 1200/400 | 3 | 53 | – |
| φ2.1/1.8×36 | 0.5–1.51 | 4 | 3.9–5 | UT2-110 | 163.36 | JZS-81 | 30 | 1410/470 | 3 | 75 | – |
| φ1.2×25 | 0.5–1.6 | 3 | 0.3–1.2 | PM650 | 40.17 | JZTY71-4 | 15 | 1200/120 | 3 | 34 | – |
| φ1.6×32 | 0.158–0.258 | 3 | 0.6–2 | PM750 | 48.57 | JZJY61-4 | 22 | 1200/120 | 3 | 46.82 | – |
| φ1.8×45 | 0.66–1.98 | 4 | 1–4.5 | UT2-110 | 163.36 | JZS-81 | 30 | 1410/470 | 3 | 80 | – |
| φ2.2×50 | 0.125–1.25 | 3.5 | 2–8 | ZS145-11 | 157 | YCT280-4A | 45 | 1320/132 | 3 | 130.71 | – |
| φ2.5×50 | 0.516–1.549 | 3.5 | 5.5–13 | ZS165-7 | 99.96 | YCT355-4A | 55 | 1320/440 | 3 | 167.5 | – |
| φ3×48 | 0.3309–3.309 | 3.5 | 9–20 | ZL130-14 | 32.11 | ZSN4-250-21B | 90 | 1500/150 | 3 | 237 | External decomposition |
| φ3.2×50 | 0.398–3.975 | 3.5 | 13–32 | ZL130-16 | 40.85 | ZSN4-280-11B | 190 | 1000/100 | 3 | 263 | External decomposition |
| φ3.3×52 | 0.391–3.91 | 3.5 | 14–38 | ZSY500-28 | 27.707 | ZSN4-315082 | 190 | 1000/100 | 3 | 280.8 | External decomposition |
| φ4×60 | 0.396–3.96 | 3.5 | 32–80 | ZSY630-35.5 | 34.601 | ZSN-355-092 | 315 | 1000/100 | 3 | 487.5 | External decomposition |
| φ4.2×60 | 0.4165–4.165 | 3.5 | 45–100 | ZSY710-35.5 | 35.526 | ZSN4-355-12 | 420 | 1000/100 | 3 | 576.1 | External decomposition |
| φ4.3×62 | 0.398–3.98 | 3.5 | 51–120 | ZSY710-35.5 | 35.714 | ZSN4-355-12 | 420 | 1000/100 | 3 | 598.5 | External decomposition |
| φ4.8×74 | 0.35–4 | 4 | 90–200 | JH710C-SW305-40 | 42.226 | ZSN-400-092 | – | – | – |
Operating Principle of a Rotary Kiln Dryer
Rotary kiln dryers use either co-current or counter-current drying, with counter-current operation being the most common method.
Material Feeding and Rotary Kiln Rotation: Wet material is continuously fed into the dryer from the higher end via a feed mechanism. The drum rotates slowly, driven by a transmission mechanism.
Lifting and Dispersion: Lifting plates within the drum scoop up the material as it rotates, dropping it down to a certain height, creating a uniformly distributed material curtain within the drum.
Heat Exchange: High-temperature hot air (typically 500-800°C) from the hot air furnace enters the kiln head or tail (depending on whether the flow is co-current or counter-current). When the material curtain comes into full contact with the hot air, intense heat and mass exchange occurs, rapidly vaporizing moisture on the material surface. Movement and Drying: Due to the inclination of the drum (typically 3-5°), the material gradually moves toward the lower discharge port under its own gravity and through continuous lifting and dropping. During this process, the material is gradually dried from the inside out.
Discharge and Dust Removal: Material that meets the required drying requirements is discharged from the discharge port. Exhaust gas, which carries a large amount of water vapor and fine dust, enters the dust removal system for purification and meets emission standards.
Rotary Kiln Dryer Applications
Mining Industry: Used for drying iron ore, copper ore, gold ore, bauxite, fluorite, clay, etc.
Chemical Industry: Used for drying calcium carbonate, aluminum hydroxide, gypsum, molecular sieves, silicone, catalysts, etc.
Building Materials Industry: Used for drying cement raw materials, slag, sand, limestone, bentonite, etc.
Environmental Protection Industry: Used for drying municipal sludge, industrial sludge, biomass waste, etc.
Agriculture Industry: Used for drying straw, distiller’s grains, soybean meal, feed, etc.
Features of Rotary Kiln Dryers
- High degree of automation and simple operation. The entire process is controlled by PCL technology, which not only monitors changes in material moisture and drum temperature throughout the process, but also adjusts the drum speed.
- Continuous production is possible. The rotary kiln dryer can dry materials 24 hours a day, achieving a very high drying capacity of hundreds of tons per day.
- Excellent drying results. The hot air drying and lifting plate system ensure thorough drying of the material.
- Easy maintenance. The rollers, gears, and other components are highly standardized, making inspection, repair, and replacement easy.
We can customize rotary kiln dryers for our customers.
As a leading global rotary dryer manufacturer, we can customize rotary kiln dryers to meet your specific needs. We design detailed plans based on your raw materials, moisture content, production volume, and site size. We also have numerous customer sites available for visits.