 Many decades of experience have given the Stork Spray-type deaerator a unique position. The patented design has been used worldwide in power plants and industrial installations to the full satisfaction of our customers. Continuous improvements and flexibility make it possible to provide highly competitive solutions.
Advantages
Lower Total Cost of Ownership, due to:
- Simple, robust design resulting in minimal maintenance
- Steam consumption savings by a very small vent flow
Single shell design, resulting in:
- Compact construction with low overall height
- Lower insulation costs compared to others
- Simple erection
Features
- Reduction of oxygen concentrations to bellow 5 ppb over wide operating ranges
- High reliability/availability
- Single shell design
- Deaerated water available as soon as deaerator is pressurized
- Possible deaerating media: (superheated) steam, steam/water mixtures, hot water or combinations here of
- Sliding pressure operation possible, from vacuum (0.2 bar) to several bar over pressure
- Robust design, allowing very rapid load changes
- Low vent losses, 10 to 70 kg/hr depending on amount of incoming oxygen
- Capacity range at the outlet from 10 to 6000 ton/hour, special models possible
- Wide operating range, 10 to 110%
Operational principles
The operation of the deaerator is based on physical deaeration, which takes place in two steps.
- Pre-deaeration in which water is sprayed in a part of the steam space;
- Final-deaeration in the water tank where steam is brought in close contact with the water to be deaerated.
The Stork spraying device achieves the pre-deaeration. Under all kind operating conditions, the sprayer assures heating up of the condensate to saturation temperature and a very large area for mass transfer. As the solubility of oxygen in water at saturation conditions is practically zero, oxygen transfers from the water droplets to the surrounding steam. As the steam condensates on the water, the concentration of oxygen in the direct vicinity of the sprayer is increased making it possible to vent a small amount of steam with a relatively high oxygen concentration.
Final deaeration in the water tank is achieved by injection of steam in the water tank. Depending on the conditions of the heat source(s) used (steam, pressurized hot water, steam/water mixture) one (or more) types of steam rake(s) are chosen. A proper designed steam rake, taking into account the hydro-dynamics in the water tank, will result in good contact between water and steam, allowing the oxygen to move from the water to the steam in accordance with Henry's law.
For more information please contact Hofung Technology or send an email to sales@hofung-technology.com.
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