Thin-Film Evaporator Rotor and Wiping System Detailed Explanation

The rotor and wipers are the core transmission components of a thin-film evaporator, directly determining the liquid film quality, heat transfer efficiency, and equipment stability. Below are the technical details:

1.Rotor System Composition

1.Main Shaft Structure:

• o Material: 316L stainless steel (standard), Hastelloy (highly corrosive conditions), titanium (chloride environments)
• o Support Method: Upper radial bearing + lower thrust bearing (withstands axial force)
• o Concentricity Requirement: ≤0.05 mm/m (prevents uneven wiper wear)

2.Drive Configuration:

• o Motor Type: Explosion-proof variable frequency motor (Ex d IIC T4)
• o Reduction Mechanism: Planetary gear reducer (torque ≥2000 N·m)
• o Sealing Type: Double mechanical seal (API 682 standard)

2.Wiper Types and Applications

3.Key Technical Parameters

1.Linear Speed Control:

• 1.o Standard Range: 2-15 m/s
• 2.o Low Speed (2-5 m/s): High-viscosity materials (>10,000 cP)
• 3.o High Speed (10-15 m/s): Low-viscosity materials (<100 cP)

2.Wiper Pressure Adjustment:

• o Spring Pressure: 0.1-0.5 Mpa (adjustable)
• o Hydraulic Pressure: 0.5-3.0 Mpa (high-viscosity conditions)

3.Wear Resistance Design:

• 1.o Wiper Blade Material: Tungsten carbide coating (hardness ≥HRA 90)
• 2.o Shell Lining: Replaceable stainless steel liner (thickness ≥6 mm)

4.Special Design Variants

1.Multi-Layer Wiper Structure:

• o Staggered upper and lower wipers achieve secondary liquid film distribution (improves heat transfer efficiency by 15-30%)

2.Eccentric Rotor System:

• o Rotor and shell installed eccentrically to create variable gap shear (suitable for crystallization-prone materials)

3.Heated Rotor:

• o Thermal oil circulated through the main shaft for double-sided heating (used for ultra-high viscosity materials)

5.Maintenance and Monitoring

1.Online Monitoring Points:

1. o oVibration Monitoring: Shell-mounted vibration sensors (threshold ≤4.0 mm/s)
2. o Torque Monitoring: Motor current feedback indicates wiper resistance (clogging warning)
3. o Temperature Monitoring: Bearing temperature (≤80°C)

2.Routine Maintenance Items:

1. o Wiper Replacement: Required when blade wear >1 mm (typically every 500-2000 operating hours)
2. o Seal Inspection: Adjust mechanical seal if leakage >10 mL/h
3. o Concentricity Calibration: Check shaft straightness annually

6.Troubleshooting Guide