A:
All Dongding dryers come with a 12-month warranty covering parts and workmanship from the date of commissioning. Lifetime technical support and spare parts supply are provided.
Introduction of Triple Pass Rotary Dryer
The triple pass rotary drum dryer is designed to improve the drying efficiency and reduce the occupied space of dryer.
Triple pass rotary dryer consists of three parts: the inner drum, the middle drum and the outer drum. These three lighter-duty drums of different diameters are nested inside each other. The drum is not set on a slope, but rather relies on pneumatic conveying to carry material through the unit.
It can be used for drying wood chips, sawdust, bark, straw, coco peat, Fiber, palm silk, alfalfa hay, sugarcane bagasse, cassava residues, etc; and the final moisture content of the material can be less than 12%. And the final product can be applied in boiler combustion, gasification and power generation, animal feed.
Advantages of Triple Pass Rotary Dryer
01
High Efficiency
The three-pass structure and counter-current design maximize thermal energy utilization; machine length is shortened by 50%, reducing building area and cost by about 40%.
02
Multiple Heat Sources
Customers can choose the heating source that fits their needs, and we can design customized solutions.
03
Uniform Drying
Multiple spreading and a long residence time ensure uniform water content throughout the raw material.
04
Stable & Reliable Operation
PLC and video monitoring systems provide a high degree of automation and easy operation, with continuous running.
05
No Heat Leakage
A unique sealing structure prevents heat leakage.
06
Low Investment
Low investment with a short investment-recovery time.
Working Principle of Triple Pass Rotary Dryer
The triple pass rotary drum dryer system is mainly composed of hot air stove, feeder, belt conveyor (optional), screw feeder, rotary drum dryer, fan, cyclone, etc.
The three pass rotary drum dryer adopts three layers of stacked drums and combines counter current and co-current drying technology to achieve efficient and uniform drying of the raw material, Maximizing thermal efficiency.
Brief Workflow
1. Material Feed and High-temperature Hot Air
Wet raw material are fed by the feeder, and high-temperature hot air enters from the discharge end in a reverse flow.
2. Three-Pass Drying
First Pass (outer drum, counter current): The raw material contacts with the high-temperature hot air, evaporating water rapidly.
Second Pass (middle channel, counter current): Semi-dry raw material continue to move in a reverse flow for stable dehydration.
Third Pass (inner channel, co-current): Nearly dry raw material come into contact with the low-temperature exhaust gas in a co-current flow, drying slowly to prevent over-drying.
3. Discharge and Dust Removal
Dried material are discharged from the discharge end, and the low-temperature exhaust gas is purified and dusted before being discharged.
Specifications of Triple Pass Rotary Dryer
| Model | DDSG2010 | DDSG2210 | DDSG2510 | DDSG2512 | DDSG2912 |
| Output Capacity(t/d) | 63.5-144.5 | 67.5-154.0 | 83.5-193.0 | 100-227.0 | 120.0-268.0 |
| Vaporization(t/h) | 1.850 | 1.976 | 2.427 | 2.912 | 3.432 |
| Early moisture(%) | 35-60 | 35-60 | 35-60 | 35-60 | 35-60 |
| Final moisture(%) | 12-15 | 12-15 | 12-15 | 12-15 | 12-15 |
| Drying temperature(℃) | 270±3 | 270±3 | 270±3 | 270±3 | 270±3 |
| Total motor power(kw) | 78 | 85 | 110 | 125 | 135 |
| Total weight(kg) | 25000 | 27000 | 35000 | 38000 | 43500 |
| Plant area(m) | 8*18 | 10*18 | 10*18 | 10*20 | 10*20 |
Notice:
1. Any change of technical data shall not be advised additionally.
2. Parameters above are for reference; final configuration is tailored to your material and capacity.
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With drying projects running across the globe, Dongding has earned long-term trust through reliable quality and responsive after-sales service.
Frequently Asked Questions
Common questions about our rotary dryers — pricing, customization, installation and after-sales.
A:
Please share your raw material, initial and target moisture content, required capacity (t/h), available fuel or heat source, and your target market. With these details our engineers can recommend the right model and send an accurate quotation.
A:
As a manufacturer, we accept orders starting from a single machine. We can also deliver complete drying production lines with auxiliary equipment such as hot air furnaces and dust collectors. Contact us for tailored pricing.
A:
Standard models are usually delivered within 25-40 days after the deposit. Customized machines or larger production lines may take longer depending on the configuration. The exact schedule is confirmed in your contract.
A:
Yes. Every dryer is engineered around your material, capacity, moisture and site layout. Heat source, material of construction, dust collection and automation level can all be customized to your process.
A:
Yes. We provide installation guidance, commissioning, operator training and lifetime after-sales support. Our engineers can also travel to your site, and all equipment comes with a warranty.
