The application of FJX
Type: Horizontal axial flow pump
Working Principle: Utilizes impeller-generated axial thrust for fluid propulsion, optimized for forced circulation in evaporation/crystallization systems.
Key Industries:
- Chemical: Diaphragm caustic soda, phosphoric acid, titanium dioxide
- Metallurgy: Alumina, hydrometallurgy (Cu/Ni sulfate)
- Salt & Food: Vacuum salt, sodium chlorate, sugar refining
- Environmental: Wastewater, FGD ammonium sulfate
- Others: Pulp & paper, lactic acid, molten salt
II. Working Principle
- Fluid Propulsion: Impeller blades generate hydrodynamic lift along the shaft axis, creating continuous flow.
- Vacuum Effect: Discharge flow draws new fluid into the inlet, maintaining steady circulation.
- Design Advantage: Superior to centrifugal pumps in low-NPSH and high-flow applications.
III. Structural Features
| Feature | Benefit |
|---|---|
| Cantilevered rotor | 50% fewer seals, reduced maintenance |
| Center-supported casing | Improved thermal alignment, no expansion joints needed |
| Rear-access design | Rotor removal without disassembling piping |
| Low-speed impeller | Minimal vibration, low crystal damage, extended wear life |
| Customizable sealing | Cartridge mechanical seals (6–12 months) or packing seals (3–6 months) |
IV. Performance Specifications
(Table placeholder for flow rate, head, power, speed, and material options based on model size)
Typical Operating Range:
- Flow: 100–10,000 m³/h
- Head: 2–15 m
- Temperature: Up to 150°C (with cooling systems)
V. Installation & Operation
5.1 Pre-Start Checks
- Confirm smooth impeller rotation (manual turn).
- Verify lubrication oil level (sight glass midpoint).
5.2 Critical Settings
- Mechanical Seal Flush Pressure: 0.03–0.05 MPa above system pressure.
- Bearing Cooling Water: 0.2 MPa inlet pressure.
5.3 Shutdown Sequence
- Stop pump → 2. Drain system → 3. Disable seal flush.
VI. Maintenance Guide
6.1 Routine Checks
| Component | Action |
|---|---|
| Mechanical Seal | Monitor flush pressure hourly; inspect for crystallization in discharge. |
| Bearings | Check oil viscosity (≥12 mm²/s); replace annually (40–65°C) or biannually (65–75°C). |
| Impeller | Clean evaporator tubes if flow drops; replace if wear >33% wall thickness. |
6.2 Performance Adjustment
- Flow Control: Adjust pulley speed (Q ∝ n, H ∝ n²).
- Vibration Mitigation: Install anti-vortex baffles in tangential-feed systems.
VII. Troubleshooting
| Issue | Root Cause | Solution |
|---|---|---|
| High power draw | Low evaporator liquid level | Raise level or adjust pump elevation |
| Seal leakage | Crystallization in seal chamber | Increase flush pressure |
| Bearing overheating | Contaminated oil | Replace oil; inspect cooler |
VIII. Overhaul Protocol
8.1 Inspection Criteria
- Impeller: Replace if wear exceeds 1/3 thickness.
- Seal Rings: Clearance limit 3 mm (Stellite-coated preferred).
- Thrust Bearings: Axial play ≤2.5 mm; replace plastic pads every 2 years.
8.2 Post-Overhaul Tests
- Vibration: <0.06 mm
- Casing temperature: <57°C
- 24-hour leak-free run.
IX. Applications by Industry
- Phosphates: Phosphoric acid concentrators
- Alumina: Sodium aluminate evaporation
- Chlor-Alkali: NaCl-laden caustic recovery
- Sugar: Molasses concentration
- Wastewater: Zero-liquid discharge (ZLD) systems
