“GD WS Screw vs High Speed Turbo“
In the wastewater treatment plant (WWT). The actual task a blower is required to perform is often very variable, not specifying an exact fixed point as in the design, but tending to consider operating realities to arrive at a most efficient point, not over the entire range required as it operates based on day-to-day practice. Many variable speed Turbo blowers will have problems, depending on the number of revolutions and the time of low air flow requirement.
Figure 1: GD WS Screw vs High Speed Turbo.
1. Gardner Denver screw blower (GD WS Screw) .
Founded in 1941 in Parma, Italy, Robuschi is world-famous for its lines of positive impact (PD) blowers, screw compressors, liquid ring vacuum pumps and centrifugal pumps.
GD Robuschi WS Screw Blower is designed as a Low Pressure Screw Compressor, according to new technology source. This is the first stage of an air compressor adapted for use in low pressure machines
- There are 6 segment ranges, suitable for every application.
- Oil-free (Certified by TUV)
- Patented screw design
- Blowing pressure up to 2500 mbar (36 psi)
- Flow from 600 to 10,500 m³/h (from 350 to 6180 CFM)
- Best energy consumption in the segment.
- Maximum speed 6000 rpm: no gearbox required
- Long life bearings
- No conflicts occurred.
Figure 2. The GD Robuschi WS Screw Low Pressure Compressor
2. Turbo blower.
High-speed turbo blowers rely on high rpm to achieve pressure, but flow is regulated by speed. Therefore, when flow decreases, pressure decreases. This is inevitable with this line of technology.
When controlling speed to meet flow and pressure demands, it is necessary to incorporate a relief valve. This process will cause surge to all devices and increase voltage due to high speed from 18,000 to 60,000 rpm and input filter.
Figure 3: Diagram of Turbo blower
3. Compare screw blowers and turbo blowers.
|
Highly effective over a wide range |
High efficiency at fixed mission points |
|
Reduction factor 4:1 |
Reduction factor 2:1 |
|
No problem for interruptions |
The opening and closing cycle will greatly affect the bearing |
|
Low speed |
High speed from 20,000 to 60,000 rpm |
|
No conflicts occurred |
Equipment conflicts will occur and there will be excess energy |
|
Can be repaired in Vietnam |
Repairs can only be made at the factory |
|
Oversized for 2.5 barG - Very light loads in WWT applications. |
Run at low speed at WWT application |
4. AVA is a solution consultant for all blower lines in Vietnam.
AVA is the representative for Gardner Denver in Vietnam, a supplier and solution consultant for Gardner Denver.
Figure 4: Design and installation of Gardner Denver's Blower system.
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Author: Duy Tuong