Double Return DryerDouble Return Dryer

Brief introduction:
Double return drying machine has been greatly breakthrough and innovation on the base of the traditional single tube rotary dryer structure. From the drying mechanism, exchange of materials and hot air more fully, more scientific and reasonable, the thermal indexes reached leading level. Adapt to clay, gypsum, coal, slag, coal gangue, mixture, dried mortar, sand, iron and other raw materials, also suitable for the drying of various phosphate fertilizer, compound fertilizer production of raw materials and metallurgy, chemical industry, bulk material.
 
Main features:
1. Double the return of drying machine of high thermal efficiency, energy-saving effect is remarkable. After testing, the thermal efficiency is higher than the traditional single return dryer 50% level. After operation of the equipment, remarkable coal saving effect.
2. The drying mechanism is scientific and reasonable, high efficiency and energy saving. Materials inside the cylinder and hot air heat exchange, convection, conduction to radiation, in the outer tube heat exchange by conduction, convection and.
3. The machine can shorten the length, facilitates the process layout. The length ratio of single return dryer shortened by about 40%, thereby reducing the workshop building area, save the project investment, process layout is more suitable for the transformation of the old plant.
4. The machine adopts the material and hot air flow drying process, applicable to a wide range of. It can be adapted to the dry clay, coal, slag, iron and other raw materials, also suitable for the drying of various metallurgical, chemical and other departments of the bulk material.
5. The structure of the machine is compact. The horizontal layout, the wheel support, cancel the size of gear drive, the roller drive, the installation is more convenient, the operation is more simple, more reliable operation, operation rate is higher.
6. The external surface area of less than 30% or more single tube rotary dryer, and the outer tube to tube with a heat insulation effect, the outer cylinder surface temperature is low, less heat loss, in high efficiency and energy saving at the same time, greatly improving the working environment and working conditions.
7. A variety of lifting plate design, the organic combination of angular lifter and swastika lifting plate, the material and the hot flue gas exchange more fully, reduce the generating mechanism of dryer cylinder "wind tunnel".
8. The variable frequency speed, adjusting the cylinder speed, according to the local water, production requirements, the proper speed, ensure that the procedures under the demand.
9. Automatic temperature monitoring system, make the operation more convenient.

Technical parameter:
Model Unit Ф2.0×7
m
Ф2.5×7.5
m
Ф3.2×8
m
Ф3.6×8.5
m
Ф4.2×9
m
Outer tube diameter m 2.0 2.5 3.2 3.6 4.2
Outer tube length m 7 7.5 8 8.5 9
Cylinder volume m3 21.98 36.8 64.3 86.48 124.6
Cylinder speed rpm 4-10 4-10 4-10 4-10 4-10
Material initial moisture % 8-20 8-20 8-20 8-20 8-20
Material final moisture % ≤1 ≤1 ≤1 ≤1 ≤1
Highest intake air temperature 750-900℃ 750-900℃ 750-900℃ 750-900℃ 750-900℃
Capacity t/h Slag 12-18 22-25 30-38 40-48 55-65
Fly ash   8-10 15-20 25-30 35-40 40-50
 Coal 8-10 13-18 23-28 33-38 40-45
Yellow sand 15-20 23-28 35-43 40-50 60-70
Motor model   Yr160m-4 Yr132m-4E Yr132m-4E Yr160m-4E Yr160m-4E
Motor power kw 5.5×2 7.5×2 7.5×4 11×4 15×4
Reducer model   XWD-6 XWD-6 XWD-6 XWD-6 XWD-6
Reducer ratio I 23-29 23-29 23-29 23-29 23-29

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