Flare Gas Recovery Systems (FGRS) are specialized compression packages, which aim to recover and repurpose gasses and emissions, such as methane/LPGs and sulfur dioxide, that would normally be burned during the flaring process. Key to the safe operation of refineries and petrochemical facilities, the process involves capturing the gas from the flare knock-out vessel and compressing it using liquid ring compressors. The so-recovered gases can be reused within the facility’s fuel gas system, as a refinery feedstock or for re-injection.
Gas flaring is generated by the combustion of associated gas coming from industrial processes including oil and gas recovery and petrochemical production. It is one of the most significant contributors to the increase in greenhouse emissions. Flare Gas Recovery Systems are one of the cleanest solutions to minimize or eliminate gas flaring.
The gas (1) coming from the flare Process Unit enters the Liquid Ring Compressor (2) along with the process water (3). After the compression phase, the gas, water and hydrocarbon mixture enters the separator (4) where the three elements are parted: the gas passes through a demister (5) to have minimum water and leaves the vessel from the top, while condensed hydrocarbons and water are separated by gravity due to lower gas speed. The water is pushed back to the compressor, after being cooled again by a cooler (6). Moreover, a continuous process water make up line (7) in the compressor suction line is provided to ensure a continuous water ring in the compressor. The condensed hydrocarbons are discarded (8).
The gas exiting the separator finally heads to the Flare gas Amine Washing Unit (9) where it is amine treated to remove H2S. The treated gas is then pushed to the Fuel Gas header to be used as fuel.
An FGR System provides a number of environmental and economic benefits to refineries, such as:
GARO liquid ring compressors are the key-element of Flare Gas Recovery Units, providing safe and reliable compression of refineries’ potentially explosive and dirty gases. Liquid ring technology runs at cooler temperatures and can work with a variety of seal liquid allowing for flexibility in treating toxic or corrosive compounds in the process gas.
GARO has patented a liquid ring compressor integrated system, able to compress and scrub refinery flare gases, using amine as service liquid. This system, called GARO WAIS (Washing Amine Integrated System) has a double scope: compress the gas and simultaneously clean it from H2S. The gas exiting the compressor is ready-to-use and does not need any other cleaning process through amine washing towers.
GARO Single Stage Liquid Ring Compressor Package
GARO Two Stage Liquid Ring Compressor Package
Since 1947, Garo has collaborated with companies around the world to custom design compressors that enable safe handling of toxic and corrosive gases. More than 70 years of engineering expertise allows us to support clients from concept/FEED studies through project execution to site services and more.