Rotary dryer

Structural Differences Between Single-Drum and Triple-Drum Dryers(The Three Cylinder Sand Dryer)

Single-Drum Dryer

Consists of a single rotating cylindrical drum, typically longer in length to ensure sufficient drying time.

Equipped with internal lifting flights to agitate and cascade materials as the drum rotates, maximizing contact with hot air (direct or indirect heating).

Simplified design with fewer moving parts, lower complexity in manufacturing and maintenance.

Triple-Drum Dryer(The Three Cylinder Sand Dryer)

Features three concentric drums (inner, middle, and outer) that rotate together, creating a compact, nested structure.

Materials flow through the annular spaces between drums, with hot air often circulating in a counter-current or co-current pattern within the same unit.

Integrates preheating, drying, and cooling stages in one system, utilizing heat more efficiently through heat recovery from exhaust air.

Selection Based on Drying Objects

Single-Drum Dryer

Preferred for materials requiring longer drying cycles or handling larger particle sizes, such as:

Bulk minerals (e.g., coal slime,,sludge) with moderate moisture content.

Heavy or abrasive materials (e.g., gravel, construction waste) where simpler maintenance is prioritized.

Applications with lower space constraints, as its longer design needs more floor area.

Triple-Drum Dryer

Ideal for materials needing efficient, space-saving drying, including:

Fine-grained or high-moisture materials (e.g.,  sand) where heat efficiency is critical.

Lightweight or heat-sensitive materials (e.g., certain chemicals, agricultural by-products) that benefit from controlled, multi-stage drying.

Scenarios with limited space (e.g., compact production lines) due to its shorter, nested structure.

In summary, single-drum dryers excel in simplicity and handling heavy/abrasive materials, while triple-drum dryers offer higher efficiency and space savings for fine or high-moisture substances.