What is a flare scrubber?
A flare scrubber is a two-phase separator that finds application in the oil and gas industry. Also known as a vent scrubber, it removes liquid droplets from waste gas streams that are sent to the flare.
Why is a flare scrubber necessary on an oil rig?
Liquid droplets must be removed from the waste gas stream before it reaches the flare. Otherwise, burning liquid might eject from the flare, causing a safety hazard. Therefore, flare scrubbers not only keep gas flare systems safe for the staff, while also ensuring an eco-friendly operation.
Principle
A flare scrubber works on the principle of gravity. Firstly, the gas stream reaches an inlet diverter that slows it down. This results in a preliminary separation of the vent gas from any associated liquid.
The gas, being lighter, rises upward, while the heavier liquid droplets fall downward. The liquid droplets that collect at the bottom of the scrubber. Once the level of the collected liquid rises above a threshold, as measured by a liquid level controller, it can be removed with the help of a pneumatic pump.
Installation and setup
A flare scrubber is installed downstream of other gas treatment devices on an oil rig. It is compact and easy to install. The setup includes not only the flare scrubber, but also the pneumatic pump that removes liquid from the scrubber tank.
Flare scrubber variety
Flare scrubbers come in at least two different varieties, for both on-shore and off-shore use. They are able to handle a vast range of gas flow rates. This makes them suitable for application in a variety of settings.
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