Degassing the hydraulic energy storage tank

What is degassing and how does it work?

What is Degassing? ’Degassing’ is the removal of hydrocarbons, explosive, odorous, or even noxious vapor from a tank, vessel, or pipeline under pressure/vacuum and controlling that vapor through chemical reactions, typically Oxidation. Oxidation uses high temperatures to convert VOC’s to water vapor and carbon dioxide.

How does a vacuum degassing system work?

As the vacuum degassing system withdraws all the gasses from the vapor phase, it reduces the system pressure below atmospheric pressure which promotes the dissolved gas molecules in the water to diffuse into the vapor phase. Thus, the concentration of gas in the water is reduced.

How does a degassing unit work?

The large surface benefits the outgassing of oxygen and free carbon dioxide. These gases are taken up and carried out by the steam flow and removed from the degassing unit at the exhaust vapour outlet in the top level of the degassing unit via the interior operating pressure. The fixtures are equipped with openings for guiding the steam.

How does thermal degassing work?

The degassed water is collected in the feedwater tank. cularly from the boiler feedwater. Germs are removed from the water at the same time. Thermal degassing often works at temperatures just over 100 °C and operating pressures of around 0.2 to 0.3 bar.

How long does it take to degas a tank?

Envent’s EMTOS units safely process from 250 to 6000 cubic feet per minute. The EMTOS 6000 can degas a 150 ft. diameter tank in as little as 4-6 hours, depending on specific levels of sludge, scale, product and regulatory requirements. Degassing a 250 ft. diameter tank can easily be completed in less than one day.

Why is feedwater degassing important?

Feedwater degassing must be protected against overpressure, underpressure and overfil-ling, and is also equipped with level, temperature and pressure indicators. Constant boiling-up of the vessel contents achieves subsequent degassing in the feedwa-ter tank. This further improves the water quality.