PRODUCTS DETAILS

Home > Products >

Vacuum Rake Dryer Suitable For Chemical, Sludge And Other Industries

Products

High Speed Centrifugal Spray Dryer

Vibrating Fluidized Bed Drying Machine

Dehydrated Vegetable Belt Dryer

Double Cone Rotary Vacuum Dryer

Vacuum Rake Dryer Suitable For Chemical, Sludge And Other Industries

MOQ:	1 set
Price:	Negotiation
Standard Packaging:	Important components placed in wooden crates
Payment Method:	L/C, T/T

Detail Information

Product Description

Detail Information

Place of Origin

China

Brand Name

suli

Certification

ISO9001

Model Number

ZPG

Material:

Stainless Steel, Carbon Steel

Model:

ZPG

Price:

Quotation Based On Requirements

Scope Of Application:

Chemical, Sludge And Other Industries

Minimum Order Quantity:

1 set

Price:

Negotiation

Packaging Details:

Important components placed in wooden crates

Payment Terms:

L/C, T/T

Highlight:

Vacuum Rake Dryer for chemical industries

Vacuum Rake Dryer for sludge drying

industrial Vacuum Rake Dryer

Product Description

Vacuum Rake Dryer for Chemical, Sludge and Industrial Applications

The vacuum rake dryer is a horizontal, indirect heat transfer, intermittent vacuum drying system. It operates by indirectly heating materials through a jacket/hollow shaft using heat mediums like steam, heat transfer oil, or hot water. Under negative pressure vacuum, built-in rake teeth agitate the material, enabling rapid vaporization of moisture or solvents at low temperatures, which are then removed by the vacuum system.

Core Structure and Working Principle

Sealed Shell and Jacket: Horizontal cylindrical construction with outer heating jacket (half-pipe or hollow paddle designs) operating under negative pressure vacuum.

Rake Teeth and Stirring Shaft: Forward and reverse rotation drive system where stirring shaft moves rake teeth alternately. Forward rotation pushes material to sides; reverse rotation gathers material toward center, ensuring uniform heating and preventing coking. Irregularly shaped rake teeth combine pushing and crushing functions, with some models featuring internal crushing rods to break up clumps during drying.

Condensation and Vacuum System: Vaporized solvents pass through filters/dust collectors and are recovered in condensers, while non-condensable gases are removed by vacuum pumps.

Technology Advantages and Limitations

Advantages:

Low Temperature High Efficiency: Reduced solvent boiling point under vacuum makes it ideal for heat-sensitive materials
High Solvent Recovery Rate: Fully enclosed system with condensers achieves over 90% solvent recovery
Suitable for High Viscosity/Paste Materials: Strong stirring prevents wall sticking and localized overheating
Intrinsically Safe: Low-oxygen negative pressure environment suitable for flammable, explosive, and toxic materials

Limitations:

Intermittent Production: Batch processing for feeding, drying, and discharging limits continuity
Mechanical Wear: Shear wear on granular materials unsuitable for maintaining crystalline structures
Complex Structure: Vacuum shaft seals require regular maintenance to prevent leakage
Complex Cleaning: Numerous internal mechanical parts increase cleaning costs during product switching

Key Selection and Design Parameters

Heat Transfer Area and Filling Ratio:

Filling coefficient typically controlled between 30-50%. Excessive filling affects evaporation space and stirring efficiency, while insufficient filling reduces heat transfer efficiency.

Heating Medium Selection:

Medium Type	Temperature Range	Application
Hot Water/Circulation	Below 80°C	Extremely heat-sensitive materials
Saturated Steam	0.2-0.6 MPa (120°C-160°C)	Most common high-efficiency medium
Heat Transfer Oil	150°C-250°C	High-boiling-point solvent removal

Shaft Seal Type (Leak Prevention):

Packaging seals are low-cost but prone to leakage for general materials. Double-end mechanical seals with gas/liquid flushing are standard for high vacuum, toxic, or corrosive solvent applications.

Discharge Valve Selection:

Use vacuum pneumatic ball valves or plunger valves with flush discharge port designs ("dead-angle-free valves") to prevent material accumulation before drying.

Common Faults and Maintenance Points

Vacuum Degree Decrease:

Caused by mechanical seal wear, aging discharge valve/manhole cover seals, or poor condenser cooling leading to incomplete solvent condensation.

Main Shaft Noise or Seizure:

Results from increased resistance during material binder phase or rake teeth colliding with inner walls. Requires inspection of reducer and drive chain.

Dust Entering Vacuum Pump:

Caused by damaged built-in bag filters or titanium filter elements at cylinder top, or malfunctioning backflushing systems.

Tags:

rake dryer industrial,