This article's table of contents introduction:
Based on the keywords you've provided, here is a breakdown of what this piece of industrial equipment is. It appears you are describing a large industrial centrifugal fan used for boiler applications in power plants or heavy industry.
Let's decode the specifications:
- Single Suction: Air enters the fan from one side only (as opposed to double suction, which pulls from both sides). This is common for high-pressure applications.
- Forward (Curved) / "Sa": This likely refers to Forward Curved Blades (often abbreviated as FC or "Sirocco" type). The "Sa" might be a model designation from a specific manufacturer (e.g., a Chinese standard model like "SA" or similar).
- Characteristic: These blades curve in the direction of rotation. They produce high air volume at low to medium static pressure, but are generally less efficient than backward curved blades.
- Note for 6kV: A 6kV motor driving a forward curved fan is somewhat rare for high power; typically, forward curved fans are used for lower pressure, high volume HVAC. At this power level, it is possible the "Forward" refers to a Forward Inlet (axial inlet) or it is a specific older design. Correction: Given the 670 t/h flow and 6kV power, this is more likely a Backward Curved or Airfoil fan (much more efficient for boiler draft). If the source explicitly says "Forward Sa," it is a high-volume, lower-pressure recirculation or fluidizing fan.
- Centrifugal: The air is moved by a rotating impeller that throws air outward by centrifugal force.
- 6kV: Voltage of the electric motor. This is Medium Voltage (MV), indicating a very large motor (typically several hundred kW to ~2 MW). This confirms it is a heavy industrial machine.
- 670t/H: 670 tons per hour. This is the mass flow rate of the air/gas being moved. This is a very large capacity, indicative of a main boiler fan for a medium-sized power plant or a large industrial boiler (e.g., 200-300 MW thermal capacity).
- Boiler Fan: The application. It is used to supply combustion air (Forced Draft - FD) or remove exhaust gases (Induced Draft - ID).
Summary of the Equipment
You are referring to a large, high-voltage centrifugal boiler fan moving 670 metric tons of air/gas per hour.
- Likely Application: This fan is a Forced Draft (FD) Fan or an Induced Draft (ID) Fan for a coal, biomass, or industrial boiler.
- Design Note: 6kV + 670 t/h strongly suggests the impeller is not purely forward curved in the traditional sense (residential HVAC style). It is more likely a Radial or Backward Curved design with a "Forward" inlet orientation, or a specific "SA" model series known for high-volume, high-temperature service.
Common Issues & Use Cases for such a Fan
- Erosion/Wear: If used in an ID application (handling hot flue gas with fly ash), the blades will wear down over time.
- Vibration: High mass flow and 6kV power mean very heavy rotating assemblies. Precision balancing and bearing health are critical.
- Motor Starting: A 6kV motor of this size requires a "soft start" (VFD or star-delta) to avoid grid voltage dips.
- High Temperature: Bearings and shaft seals must handle radiant heat from the boiler.
If you need a specific replacement part or datasheet: Look for the manufacturer's name (e.g., Shenyang Blower, Howden, New York Blower, or a Chinese standard model like "SAF" or "G4-73"). The model "SA" is a very common Chinese standard centrifugal fan series suitable for 6kV and high tonnage flows.
Recommendation: If you are purchasing or repairing this fan, confirm whether the "Forward" refers to the blade type or the inlet design, as a true Forward Curved fan at this power level is unusual for a main boiler fan (unless it is a seal air fan or fluidizing fan).
