What is Thermal Degassing?
Thermal degassing, as the name suggests, involves the use of heat to remove dissolved gases from fluid. Thermal degassing is capable of lowering the amount of dissolved gases to under 3 parts per billion.
Principle
Thermal degassing leverages the insolubility of gases in liquid solvents at high temperatures. For example, dissolved gases can be removed from demineralized water through thermal degassing as they become insoluble above 104°C. At the appropriate pressure and temperature conditions, dissolved gases enter into the vapor phase automatically.
Specifically, saturated vapor is collected above certain threshold levels of pressure and temperature. When this vapor comes into contact with the fluid that needs to be degassed, the dissolved gases get desorbed.
Thermal degassing variety
There are three types of thermal degassing procedures, namely, tray degassing, spray degassing, and spray-tray mixed degassing. The mixed thermal degassing procedure is the most efficient, but also the most expensive and complex one.
The choice of the thermal degassing technique depends on how demanding the application is.
Thermal degassing setup
Thermal degassing requires a heater and a fluid supply unit (such as a diffuser spray for spray degassing). Additionally, an elevated storage tank, connected to a pump, is used to collect the degassed fluid. Importantly, an evacuation safety valve is added to the setup to prevent the system pressure from rising more than 15% over the operating pressure.
Since thermal gassing relies on heat energy, it is crucial for all exposed parts of the setup to have thermal insulation.
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