**Calculation guide for the number of aeration discs that can be driven by a 3kW Roots blower**
---
**1、 Key influencing factors**
1. * * Fan performance parameters * *:
-Air volume: Typically, a 3kW Roots blower has an air volume of approximately * * 2.5~4.5m3/min**
-Pressure: Common working pressure * * 39.2~58.8kPa * * (4-6 meters of water column)
2. Characteristics of aeration disc:
-Single disc standard ventilation rate: * * 0.03~0.12m3/min * * (depending on aperture and material)
-Working water depth: For every 1 meter increase in water depth, an additional pressure of 9.8kPa is required
3. * * System loss * *:
-Pipeline loss: approximately 0.5~1kPa per 10 meters of straight pipe**
-Bend loss: Each 90 ° bend ≈ * * 0.3~0.5kPa**
---
**2、 Calculation method**
**Formula * *:
\[
\Text {number of disks allowed}=\ frac {\ text {fan effective air volume} {\ text {single disk air consumption}} \ times \ text {simultaneous working coefficient}
\]
**Step * *:
1. * * Determine the gas consumption of a single disk * * (Example):
-Micro porous aeration disc: 0.05m3/min/piece
-Coarse hole aeration disc: 0.1m3/min/piece
2. * * Calculate effective air volume * *:
-Assuming a fan airflow of 3.5m3/min and an efficiency loss of 15:
\[
\Text {effective air volume}=3.5 \ times 0.85 ≈ 3.0m3/min
\]
3. * * Calculate the number of disks * *:
-Micro porous disk:
\[
\Frac {3.0} {0.05}=60 \ text {pieces}
\]
-Coarse hole disk:
\[
\Frac {3.0} {0.1}=30 \ text {pieces}
\]
---
**3、 Number of recommendations in different scenarios**
|* * Aeration disk type * * | * * Single disk gas consumption (m3/min) * * | * * 3kW fan can carry a certain number * * | * * Applicable scenarios * *|
|----------------|-------------------------|---------------------|--------------------|
|Micro porous ceramic discs | 0.03~0.05 | 60~100 pieces | Sewage treatment, aquaculture|
|Rubber film disc | 0.06~0.08 | 40~50 pieces | Industrial aeration|
|Coarse hole PV disc | 0.1~0.12 | 25~30 | Emergency oxygenation|
---
**4、 Pressure verification (important!)**
1. * * Total pressure demand * *:
\[
P_ {Total}=P_ {Depth}+P_ {Pipeline}+P_ {Aeration Disk}
\]
-Example (water depth of 3 meters):
\[
3 \ times 9.8+2 \ text{(pipeline)}+5 \ text{(aerator)} ≈ 36.4 \ text{kPa}
\]
-Typical pressure capacity of 3kW fan: 39.2~58.8kPa (meets demand)
2. Overpressure risk:
-If the calculated pressure is greater than the rated pressure of the fan, it is necessary to:
-Reduce the number of aeration plates
-Replace the high-pressure fan
-Optimize pipeline design (increase pipe diameter/reduce bends)
---
**5、 Optimization suggestions**
1. * * Pipeline Design * *:
-Main pipe diameter ≥ DN65, branch pipe ≥ DN40
-Adopting a circular pipeline network to balance pressure
2. * * Energy saving measures * *:
-Install a frequency converter (energy-saving 20-30)
-Group control (alternate operation)
3. * * Maintenance points * *:
-Regularly clean the aeration disc (anti clogging)
-Check the tension of the fan belt (monthly)
---
**6、 Typical configuration case**
**Scene * *: 5 meters deep fish pond oxygenation
**Configuration * *:
-Fan: 3kW Roots (air volume 3.2m3/min, pressure 49kPa)
-Aeration disc: Micro porous disc (0.04m3/min/piece)
**Calculation * *:
\[
\Frac {3.2} {0.04}=80 \ text {theoretical}
\]
**Actual configuration * *:
-Reserve 20 margins → * * 64**
-Control in 4 groups (16 per group)
---
**Note * *: Specific parameters (water depth, pipeline layout, aeration disc model, etc.) need to be provided for calculation. It is recommended to reserve 10-15 air volume adjustment space during the first installation and control the actual ventilation volume through valves.
