Pneumatic Transport
Power Requirement of blower
Dilute Phase Conveying
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| Section summary |
|---|
| 1. Estimation of the power required for conveying bulk solids in dilute phase |
| 2. Example of calculation of the power required for dilute phase conveying |
| 3. Other formula |
1. Estimation of the power required for conveying bulk solids dilute phase
The required power of a blower used in dilute phase pneumatic conveying can be calculated with the following estimation [Mills] :
Power = 165*ma*ln(P4/P3)
Pressures are absolute
Please note that this formula is not for design but only to have an idea in pre-project or during troubleshooting. This estimation is valid for dilute phase pneumatic conveying systems.
2. Example of calculation of the
power required for dilute phase conveying
A blower has to deliver 400 Nm3/h of air at 0.35 bar g, from air at atmospheric pressure and 20°c, for conveying powder.
STEP 1 : calculate the air mass flow rate
The compressor is to deliver 400 Nm3/h of air. Normal conditions are 101325 Pa and 20°c, at this pressure gas ideality is mostly verified thus the specific gravity is PM/RT/1000 = 1.205 kg/m3. This gives a mass flowrate of 400*1.205 = 482 kg/h=0.1338 kg/s.
STEP 2 : calculate the air conveyor blower power
Outlet pressure = 0.35 bar g = 136325 Pa abs
Inlet pressure = 0 bar g = 101325 Pa abs
Power = 165 * 0.1338 * ln 136325/101325 = 6.55 kW
The pneumatic conveying blower needs to deliver 6.55 kW. Warning
: this is not including efficiencies that need to considered on
top of that.
3. Other formula
Other calculation method, more precise
and general for compressors and for higher pressure can be found
on Process Engineers Tools website.