ZeroGas Thermophysical Deaerators
The thermophysical deaerator aims to remove dissolved gases (carbon dioxide and oxygen) from boiler feed water, thus reducing the risk of corrosion within the thermal cycle.
Deaeration happens by spraying water and making it fall in a contact section. At the same time, steam acts as a stripping and heating medium in counterflow.
Cannon Artes has proprietary thermophysical deaerator technology called ZeroGas. Different deaerators can fall under the ZeroGas Deaeration technology.
In the Spray & Tray configuration, the degassing process is achieved in the deaerating tower, where make-up water is atomized on a set of special “structured packing.” This increases the contact between water and steam, where dissolved gases are stripped and vented with steam.
According to the design capacity and steam flow, the deaerating tower may be arranged vertically or horizontally to implement a larger mass and heat transfer surface.
We can provide “spray-type” deaerators that combine the deaerating and storage sections into one single tank with a very efficient design, leading to a more compact size and reduced weight.
We can partner with you for Integral Deaerators that can be installed directly on the LP drum of the heat recovery steam generator, with the advantages of using the steam produced within the drum itself and saving an additional storage section. This is a critical application since the steam flow within the deaerating tower is driven by the pressure loss across the mass transfer section (and by the differential temperature since the system is in liquid-vapor equilibrium).
Whatever is your need for deaeration, Cannon Artes’ expertise is at your fingertips.
ZeroGas thermophysical deaeration is a specific technology in which dissolved gases are removed from the liquid phase by reducing the partial pressure of oxygen and carbon dioxide over the liquid surface by replacing air with steam.
To establish the equilibrium for oxygen and carbon dioxide between the liquid and vapor phases, the contact area is increased by spraying the liquid and making it fall on a proprietary structured packing. Steam is employed as a stripping and heating medium because the solubility of gases is reduced at higher temperatures.
Therefore, operation at higher-than-atmospheric pressures enables the establishment of more favorable equilibrium conditions because of the decreasing solubility of gases at increasing temperatures.
Our designs reduce dissolved oxygen content in the water to less than 7 ppb O2 and minimize the vented steam flowrate with a significant savings of steam consumption.