How to choose and install magnetic levitation blower with appropriate power in chemical and pharmaceutical workshop?

When selecting the power of magnetic levitation blower in chemical and pharmaceutical workshops, the core is to correct according to the process air volume, system pressure, medium and working conditions, and then add GMP cleanliness, high frequency conversion efficiency and safety margin, and finally match the mainstream range of 37-200kW to avoid small horse-drawn carts or overqualified ones.

First, make clear the purpose of the process (determine the basic parameters)

Fermentation aeration (antibiotics, vitamins, intermediates): the air demand is large, the pressure is 50–80 kPa, and the power is mostly 55–160 kW.

Ventilation/air conditioning in clean workshop: the pressure is 300-800Pa, the air volume is calculated according to the number of air changes, and the power is 15-55kW (low power section).

Process gas transmission/reactor gas supply: the pressure is 40–100 kPa, and the medium may contain a small amount of solvent and water vapor, so it needs anti-corrosion and explosion protection, and the power is 37–110 kW.

Wastewater aeration: pressure 40–60 kPa, continuous operation, power 45–90 kW.

Second, the core steps of power calculation (engineering formula)

Determine the actual air volume q (m/h)

Fermentation: according to tank capacity × gas-liquid ratio (1: 0.6–1: 1.2) × number of tanks × simultaneous utilization rate.

Ventilation: clean room volume × air change times (ISO 7/8: 15–25 times /h).

Correction: When the altitude is above 500m and the inlet temperature is above 30℃, the air volume will be * *× 1.1–1.2 * *.

Calculate the total system pressure p(Pa)

Fermentation/aeration: 50,000-80,000Pa

Ventilation pipe: 300–800 Pa

Pipe network resistance+local resistance+end resistance, plus 10-15% margin.

Theoretical shaft power (kW)

P

axis

=

3600×1000×η

fan

Q×p

Magnetic levitation efficiency η = 0.80–0.88 (direct connection, gearless)

Example: q = 3000m/h, p=70000Pa, η=0.85.

P

axis

=3000×70000/(3600×1000×0.85)≈68.6 kW

Rated power of motor (matching standard gear)

P

electrical machinery

=P

axis

×K

safe

K = 1.15–1.25 (1.2 for continuous pharmaceutical conditions)

Example above: 68.6×1.2≈82.3kW → 90kW (standard power gear).

III. Special requirements of pharmaceutical workshop (affecting power and configuration)

Oil-free cleaning: magnetic levitation has no lubricating oil, which conforms to GMP and avoids pollution of raw materials/packaging materials.

Explosion-proof and anticorrosion: Ex d IIB T4 explosion-proof is selected for solvent and VOC occasions, and the shell/impeller is 304/316L, with the same power but upgraded configuration.

Frequency conversion continuous operation: the annual operation is more than 6000h, and the high efficiency area is selected for operation (specific power ≤ 0.075 kW/(m/min kPa)).

Noise control: ≤75dB(A), built-in muffler, no extra power.

One for use and one for standby: two machines have the same power to avoid overload of a single machine.

Fourth, common misunderstandings of power selection

Just look at the air volume without looking at the pressure: insufficient pressure → insufficient air volume → forced to exceed the power → burning the motor.

Excessive margin: more than 1.5 times → long-term low load of fan, deviation from high efficiency area and high energy consumption.

Ignore the medium: containing corrosion/dust → not being preserved → decreasing efficiency and increasing power implicitly.

Altitude/temperature is not corrected: the air at high altitude is thin → the same air volume needs more power.

Five, installation and power matching points

Direct connection installation: magnetic levitation is high-speed direct connection, without coupling/belt, with efficiency ≈1.0 and no additional power loss.

Foundation shock absorption: rigid foundation+shock absorber to reduce vibration loss.

Pipeline sealing: air leakage rate < 3%, avoiding extra power compensation.

Three-stage filtration: initial+medium+high efficiency, air intake resistance < 500Pa, to prevent power waste.

Intelligent control: PID frequency conversion, pressure closed loop, automatic power adjustment when load fluctuates, saving energy by 20-30%.

Six, the typical power range (chemical pharmaceutical)

Small-scale fermentation/wastewater: 37–55kW

Medium-sized fermentation/process gas supply: 75–90kW (most commonly used)

Large-scale fermentation/multi-tank parallel connection: 110–160 kW

Clean ventilation/auxiliary: 15–45kW

VII. Summary of Selection

Calculate the actual air volume+system pressure, plus 10-15% margin.

Calculate the shaft power with the formula and multiply it by the safety factor of 1.15–1.2.

Up to the standard power gear (37/45/55/75/90/110/132/160kW).

Superimposed explosion-proof, anti-corrosion, oil-free and frequency conversion configuration.

One for use and one for standby, high-efficiency zone operation and intelligent control.