Rotating Drum Shell for Rotary Drum Granulators

Product Specifications

Technical details and manufacturing context for Rotating Drum Shell

Definition

The rotating drum shell is the primary structural component of a rotary drum granulator used in compound fertilizer production. It forms the cylindrical chamber where raw fertilizer materials are tumbled, mixed, and agglomerated into granules through the application of binders and mechanical action. The shell's rotation facilitates uniform coating and size development of fertilizer particles while providing containment for the granulation process. Constructed from materials such as carbon steel, stainless steel (304/316L), or abrasion-resistant steel plate, the shell is designed to withstand the mechanical stresses of continuous operation. Key parameters include an inner diameter of 1000–3000 mm, a shell length of 3000–12000 mm, and a shell thickness of 12–30 mm. The rotational speed typically ranges from 2 to 15 r/min, and the operating temperature is between -10°C and 80°C, as material strength degrades above 80°C. Material grades may range from Q235B to Q345R per GB/T 3274, with surface roughness of Ra 3.2–6.3 μm and cylindricity tolerance of ±2 mm. The maximum load capacity is 50–200 t/h, and the shell weight ranges from 5000 to 30000 kg, with drive power of 15–90 kW. These values are directory references and must be confirmed for the specific model and application. The shell's interior may include lifters or flights to enhance tumbling action, and its smooth surface minimizes material sticking. Proper maintenance, including inspection for wear and corrosion, is essential to ensure structural integrity and consistent granulation performance. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The drum shell rotates on its longitudinal axis, typically driven by a motor and gear system. As it rotates, the fertilizer materials inside are lifted by internal lifters or flights to a certain height before cascading down, creating a tumbling motion that promotes mixing, agglomeration, and uniform granule formation. The shell's cylindrical shape and smooth interior surface ensure consistent material flow and prevent dead zones where material could accumulate.

Common Materials

Carbon steel, Stainless steel (304/316L), Abrasion-resistant steel plate

Technical Parameters

Parameter	Typical range	Notes & selection driver
Inner Diameter	1000–3000 mm	Determines production capacity
Shell Length	3000–12000 mm	Affects residence time and granulation quality
Shell Thickness	12–30 mm	Structural integrity and wear resistance
Rotational Speed	2–15 r/min	Critical for granule formation and tumbling action
Operating Temperature	-10–80 °C	Material strength degrades above 80°C
Material Grade	Q235B–Q345R	Q345R for higher strength and corrosion resistanceGB/T 3274
Surface Roughness	Ra 3.2–6.3 μm	Smoother surface reduces material sticking
Cylindricity Tolerance	±2 mm	Ensures uniform wall thickness and balance
Maximum Load Capacity	50–200 t/h	Throughput capacity based on material density
Weight	5000–30000 kg	Affects foundation and transportation requirements
Drive Power	15–90 kW	Depends on shell size and material weight

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Shell Body Part
Main cylindrical structure that contains the granulation process

Material: Steel plate (rolled and welded)
End Plates Part
Circular plates welded to both ends of the cylindrical shell to form enclosed chamber

Material: Steel plate
Mounting Flanges Part
Flanged connections for attaching to support rollers and drive system

Material: Carbon steel
Inspection Ports
Access openings for maintenance, cleaning, and process observation

Material: Steel with removable covers
Internal Lifters
Weld-in flights that lift the bed and let it cascade, which is what makes granules grow.

Manufacturers of Rotating Drum Shell

Manufacturer profiles associated with Rotating Drum Shell.

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Frequently Asked Questions

What materials are commonly used for rotating drum shells?

Common materials include carbon steel, stainless steel (304/316L), and abrasion-resistant steel plate. The choice depends on the application's corrosion and wear requirements.

What is the typical rotational speed range for a drum shell?

The rotational speed typically ranges from 2 to 15 r/min. The exact speed is set based on the desired tumbling action and granulation quality.

How does the shell length affect granulation?

Shell length affects residence time and granulation quality. Longer shells provide more time for material to tumble and agglomerate, but may require more power and space.

What maintenance is required for a rotating drum shell?

Regular inspection for wear, corrosion, and structural integrity is essential. Check for material buildup, surface roughness changes, and ensure the drive system is properly aligned.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 0.5 bar gauge - low pressure containment only
flow rate:	Dependent on drum diameter and rotational speed, typically 5-100 tons/hour
temperature:	Ambient to 150°C (302°F) - typical process range for fertilizer granulation
slurry concentration:	40-75% solids by weight - optimal for granule formation

Rotating Drum Shell

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