A Steam Jet Ejector is simplified type of vacuum pump or compressor, consisting of three basic parts :
The Nozzle discharges a high velocity Steam Ejector across a suction chamber that is connected to the equipment to be evacuated. The process vapours are entrained by this Steam Jet and carry into a Venturi shape diffuser, which convert the velocity energy of the steam into pressure energy enabling discharge ultimately to atmosphere.
The Ejectors are generally categorized into one of four types:
1. Single Stage.
2. Multi-stage condensing.
3. Multi-stage non-condensing.
4. Multi-stage with both condensing and non-condensing stages.
Lower suction pressure is obtained by staging of the Ejectors. The number of stages of Ejectors is depended on the suction pressure required. Nominal range of suction pressure for number of Ejector is stated below:
|
Stages |
Nominal range of pressure (in torr) |
Nominal range of Vacuum (in mm Hg (v) |
|---|---|---|
| Single stage | 80 – 300 torr | 460 – 680 mm Hg (v) |
| Second stage | 12 – 100 torr | 660 – 748 mm Hg (v) |
| Third stage | 4 – 25 torr | 735 – 756 mm Hg (v) |
| Fourth stage | 4 – 0.06 torr | 756 – 759.4 mm Hg (v) |
| Fifth stage | 0.6 – 0.02 torr | 759.4 – 759.98 mm Hg (v) |
| Sixth stage | 0.05 – 0.01 torr | 759.95 to 759.99 mm Hg (v) |
|
Motive Pressure |
Discharge Pressure |
Suction Pressure |
Suction Capacity |
|---|---|---|---|
| Decrease | Constant | Increase rapidly | Decrease rapidly |
| Constant | Increase | Increase rapidly | Decrease rapidly |
| Constant | Constant | Increase | Increase |
| Constant | Constant | Decrease | Decrease |
| Increase | Constant | Constant | Decrease rapidly |
| Constant | Decrease | Constant | Unchanged |
Also, nowadays, considering high cost of energy, mainly steam, most of the installations have incorporated multiple nozzle Boosters which consume about 15 20% lesser steam compared to conventional single nozzle Booster designed for the same motive and suction pressure and capacity.
Mazda Limited in India supplies these special multiple nozzle Boosters since last ten years in collaboration with world leaders
Mazda can therefore, claim to be instrumental in improving the efficiency of various refineries and saving India’s precious natural resources.
Consistent High Performance
Mazda two-stage Vacuum Pumps with their rugged cast iron and stainless steel components are the result of an intensive development and testing program. These innovative products incorporate modern engineering of Mazda experience in Vacuum technology. All Vacuum Pumps are subjected to 100% performance test prior to shipment.
Popular Sizes in Stock
Mazda Manufactured New Generation Liquid Ring Vacuum Pumps (Model CR-25, CR-27 & CR-210) prompt delivery.
Very High Reliability
There are no Teflon or rubber balls inside the pumps to deteriorate Vacuum performance. CR pumps require very little maintenance.
Extra Deep Stuffing Box
Combined with low friction, pure graphite packing gives greater reliability.
Exclusive Shaft Sealing Design
The injection of water directly into the Teflon ring / nylon ring which is trapped between graphite seals. This water penetrates for lubrication, cooling and prevents gas leakage.
Steam Reformer
Steam Reformer is new generation equipment which is a combination of steam separator and strainer.
Installation of the Steam Reformer greatly improves the boosters and ejectors performance as it ensures dry and clean steam to the nozzle. Therefore consistent level of vacuum is maintained which also prevent the nozzles from getting clogged.
Operation and separation efficiency
Reformer filters and separates water particles from flowing stream by employing the two best methods of separation.
A confounded series of vanes and fins change the steam, air or gas flow into a high speed cyclone flow, separating even mist-like condensate with 98% efficiency. The fluid velocity is first maintained but the flow is given a twist so that the heavier water droplets are flung out of suspension by centrifugal force against the sides of the vessel. The flow area is then increased so that the fluid velocity drops to prevent pick-up of separated water