Vacuum Technology
Steam jet heaters
Steam jet heaters are based on proven jet pump technology and often used to heat liquids by direct injection of heating steam.
Applications
Steam jet heaters are used to heat liquids by direct injection of heating steam. The heating steam condensate mixes with the liquid being heated.
Steam jet heaters are used to prepare hot water for different purposes, such as barrel rinsing water in malting plants, warm water for pickling, dyeing, and greases in tanneries, for washrooms and bathrooms and for heating sewage sludge, boiling lye etc.
Mode of operation
There are generally two different construction forms, according to the application:
- Steam jet heaters for vessels (aw1)
- Steam jet heaters for installation in pipes and for passage or circulation heating systems:
- Type “L” (aw4)
- Type “H” (aw5)
- “System Ciba-Geigy” (aw6)
Advantages
- Low noise operation
- No moving parts
- Low maintenance
- Simple construction
- High reliability
- Can be installed in virtually all situations
- Quickly and easily put into operation
- Adjustable heating capacity
- Almost unlimited life, when a suitable material of construction is chosen
- Can be manufactured from various materials of construction
- Low acquisition costs
For Vessels (aw1)
Steam jet heaters type aw1 are based on proven jet pump technology and often used to heat all kinds of liquids in vessels.
Type aw1
Applications
Steam jet heaters are used to heat all kinds of liquids in vessels. Heating is achieved by means of direct condensation of steam. The steam condensate mixes with the liquid.
Mode of operation
The steam jet emerging from the motive nozzle accelerates the liquid present in its vicinity and in the mixing nozzle and condenses. In this way a controlled flow is produced. Furthermore, the whole content of the vessel is set in motion and the heat transferred to the liquid is evenly distributed throughout the vessel.
For Pipes (aw4, aw5, aw6)
Mode of operation
The condensation nozzle is inside the steam jet heater. It is provided with bore holes so that the steam can pass directly into the liquid to be heated and condenses. This takes place at the point of highest velocity of the liquid, its lowest pressure and its greatest turbulence. The downstream arranged diffuser reduces the velocity of the liquid again at the same time increasing its pressure.
Type "L" (aw4)
Applications
Steam jet heaters are used to heat liquids by means of direct condensation of steam. The steam condensate mixes with the liquid. Steam jet heaters type “L” are used in passage and circulation heating systems. The achievable heating per pass amounts to max. 90 K.
Type "H" (aw5)
Applications
Steam jet heaters type “H” are used in passage and circulation heating systems:
- Heating to max. 30 K per pass
- Steam flow control range up to max. 5:1
"Ciba-Geigy" (aw6)
Applications
Steam jet heaters are used to directly heat a liquid with heating steam. Steam jet heaters, “System Ciba-Geigy”, are used in passage and circulating heating systems and for batch processes.
Mode of operation
- Flow rates of 2–700 m³/h
- Heating per pass up to approx. 30 K
- Control range of heating capacity up to 200:1
- Heating up to approx. 5 K below the saturated steam temperature of the heating steam
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