Rotary dryer 3,5х27 m
Drying cylinders are designed for drying of bulk materials by furnace gases.
They are used in construction materials industries in various processing lines for heat drying of lime-stone, clay, sand drying, chalk-stone, gypsum and other bulky materials with particles lump size up to 60 mm.
The enterprise designs and manufactures drying complexes of various construction materials according to customer’s initial information.
Drying cylinder consists of a casing, support and thrust station, support station, drive, tyres, toothed gear.
Drum casing is a welding structure made from separate sidewalls. Various types of heads are installed inside the casing for activization of heat transfer depending on a drum modification:
- at the very beginning - screw type, on the whole part of the drum – lifting blade type;
- at the very beginning - screw type, in the middle drum part - lifting blade and chain type;
- at the very beginning - screw type, in the middle drum part - lifting blade and sector type
Application of various head types depends on the properties of the drying material (input and output moisture, fraction composition, flowability, etc.) and is chosen in each separate case together with the customer and manufacturer.
Two steel tyres are the support of the casing. One tyre is beveled for thrust rollers which prevent longitudinal drum shift.
The casing is supported by its tyres on the support and thrust - support stations. Ring gear is fixed on the drum casing by means of cross-beams, through which the drum is rotating from the drive.
The drive consists of a drive pinion, gear box and electric motor connected between each other by couplings and mounted on one frame.The drum is installed towards the horizon at an angle 1o-4o.
Casing incline in combination with axial rotation provides the material shift towards the discharge chamber. Hot furnace gases enter the casing and touching the material heat it up evaporating the moisture it contains. Heat transmission occurs by three main methods: in weighed condition at material falling from the blades, from furnace gases through outer surface of the lying material in the material pile, from more heated parts of the drum inner device and a sidewall.
Drying modes for various materials are changing depending on raw material moisture on the drum input and the required moisture of finished material on the drum outlet, material fraction composition subject to drying, material characteristicsTemperature of the heat carrier supplied to the drum shall not exceed 900oС.
Flue-gas temperature at drum outlet not less than 100 - 150oС to exclude possibility of moisture condensation in the drum discharge section.
On furnace gas inlet of the drum there shall be vacuum not les than 30 Pa.
|Name||Drying cylinder (3,5х27)|
|Mode of operation||Continuous|
|Drum casing size (diameter х length), mm||3500х27000|
|Drum volume, m3||250|
|Drum casing incline towards the horizon, degree.||3|
|Installed power, kW||120|