9800 Pa,20,000 m³h,50 Hz/60 Hz High-Pressure,High-Volume Centrifugal Blower

This article's table of contents introduction:

1. Performance Analysis
2. Required Motor Power (Estimation)
3. Typical Impeller Types for this Spec
4. Key Applications
5. Critical Selection Checklist
6. Summary of a Potential Supplier Specification Sheet

This is a specification for a high-power industrial centrifugal blower. The combination of 9,800 Pa (pressure) and 20,000 m³/h (flow) requires a significant amount of power, typically in the 55 kW to 90 kW range depending on efficiency, air density, and specific fan design.

Here is a detailed breakdown of what this specification means, typical applications, and key engineering considerations.

Performance Analysis

• Pressure: 9,800 Pa (≈ 1,000 mmH₂O or 1.42 psi)
  • Classification: This is considered a high-pressure centrifugal fan, not a standard ventilation fan (which usually operates below 2,000 Pa).
  • Implication: The blower must have a robust impeller design (often backward-curved or radial blades) to generate this force.
• Flow: 20,000 m³/h (≈ 11,775 CFM)
  • Classification: This is a high-volume industrial flow rate.
  • Implication: Large inlet/outlet diameters (likely DN 500 to DN 630 or larger) and a substantial housing.
• Frequency: 50 Hz / 60 Hz
  • Design: This indicates a dual-frequency motor or a motor designed to perform at both standards.
  • Important Ratio: Because fan performance follows fan laws:
    • At 60 Hz (vs 50 Hz), the speed is 20% higher.
    • Flow increases by 20% (to ~24,000 m³/h).
    • Pressure increases by 44% (to ~14,112 Pa).
    • Power increases by 72%. A motor sized for 60 Hz will be significantly larger than one sized for 50 Hz.

Required Motor Power (Estimation)

Using the fan power equation: $$P = \frac{Q \times p}{\eta}$$

• Q = Flow (m³/s) = 20,000 / 3,600 = 56 m³/s
• p = Pressure (Pa) = 9,800 Pa
• η = Total Efficiency (Assume high-efficiency backward curved fan = 75%-82%)

Calculation: $P{shaft} = (5.56 \times 9800) / 0.78$ $P{shaft} \approx 69,846 W \approx 70 kW$

Recommended Motor Size:

• 50 Hz: 75 kW (Standard frame size, e.g., IE3 or IE4)
• 60 Hz: 110 kW (To handle the 72% power increase)

Typical Impeller Types for this Spec

For 9,800 Pa / 20,000 m³/h, the impeller must be strong and efficient. The most common types are:

Key Applications

This specific pressure and flow combination is ideal for:

1. Pneumatic Conveying: Moving cement, wood chips, grains, or plastic pellets over medium distances.
2. Industrial Drying Systems: Paper machines, textile dryers, or spray dryers requiring high static pressure to push through narrow ducts and nozzles.
3. Flue Gas Desulfurization (FGD): Forced draft in power plants or scrubber systems.
4. Air Knife Systems: Drying bottles or sheets after washing.
5. Wastewater Treatment: Aeration in deep tank biological reactors (membrane or fine bubble diffusers).

Critical Selection Checklist

If you are sourcing this blower, verify the following:

• ☐ Dual Frequency Motor: Specify if the motor must run on both 50 Hz and 60 Hz (e.g., for export or variable grid). The VFD (Variable Frequency Drive) must be programmed for both.
• ☐ Inlet/Outlet Orientation: Define the discharge angle (e.g., Top 90°, Bottom 0°, etc.) and rotation direction (CW or CCW).
• ☐ Material of Construction:
  • Standard: Mild Steel (MS) or Corten steel for the housing, S45C steel for the shaft.
  • Corrosive: SS304 or SS316L for impeller and casing.
  • Spark Resistant: Aluminum or copper-tipped blades for flammable environments.
• ☐ Temperature: Standard air (-20°C to +80°C). High temperature (e.g., 200°C+ ) requires a cooling fan on the motor shaft, ceramic wool insulation, or a heat slinger.
• ☐ Mounting: Typically a heavy-duty I-beam base frame with vibration dampers.

Summary of a Potential Supplier Specification Sheet

Next Step: If you are ordering this, provide the density of the gas (Air, Flue gas, etc.) and the operating temperature, as these drastically change the motor power requirement. For example, moving 200°C air requires a much larger motor than moving ambient 20°C air due to lower density.