The indirect heat drier is mainly composed of rotary body, lifting blade, transmission device, supporting device, seals and other components. It is widely used to dry slag, limestone, coal powder, slag, clay, etc in building materials, metallurgy, chemical industry and cement industry. After being dried, the material moisture content can be achieved to 1-0.5%.
Advantages
Compact structure, reasonable layout, good drying effect;
Small basis investment, which is only half of the same production monocular dryer;
Reliable operation, low energy consumption, high thermal efficiency;
Automation control reduces the operating personnel, saving labor resources.
The outlet temperature is low and the dust removal device has long service life.
Working Principle
First of all, the materials are sent into the inner layer of the rotary drum from the feeding device to get downstream drying, then constantly be picked up and scattered in inner copy board where they move in the spiral travel type and reach heat exchange;
Secondly, the materials move to the other end of the inner layer and enter the middle layer to get countercurrent drying; materials are constantly lifted in the middle layer, fully absorbing the heat of both the inner drum and the middle roller so that the materials achieve optimal dry state.
Then, the materials move to the other end of middle layer and fall into the outer layer, they move in a rectangular multi-loop way in the outer drum; after achieving the drying effect of materials, they will be discharged from drum under the role of hot air; when the wet materials are fully dried in rectangular copy board, the purpose of drying will be achieved.
| Items Shell diameter×shell length |
Inside diameter of outer shell(mm) | Inside diameter of inner shell(mm) | Shell length(m) | Shell length(m3) | Shell obliquity | Lifting blade form | Highest inlet air temperature(℃) | Dimensions(m) |
| Φ1.5×15m Φ1.5×17m Φ1.5×19m |
1500 | 500 | 15 17 19 |
20.27 22.97 25.68 |
3-5% | Lifting form | 850 | 16.2×2.7×2.7 18.2×2.7×2.7 20.0×2.9×2.9 |
| Φ1.8×21m Φ1.8×23m Φ1.8×25m |
1800 | 650 | 21 23 25 |
35.91 39.33 42.75 |
3-5% | Lifting form | 850 | 22.5×2.7×2.7 24.5×2.9×2.9 26.5×2.9×2.9 |
| Φ2.2×21m Φ2.2×23m Φ2.2×25m |
2200 | 800 | 21 23 25 |
58.10 63.61 69.15 |
3-5% | Lifting form | 850 | --- |
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