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Liquefied natural gas

Most natural gas producers use tri-ethylene glycol (TEG) to remove water from the natural gas stream to meet pipeline quality standards. This dehydration process is required to prevent the formation of hydrates at low temperatures and corrosion caused by carbon dioxide or hydrogen sulfide, which are normally not removed at this stage.

Dehydration is accomplished by reducing the inlet water dew point. The wet gas is brought into contact with dry glycol in an absorber. The glycol absorbs the water vapor, reducing the dew point. The wet rich glycol then flows from the absorber to a regeneration system where the entrained gas is separated and fractionated in a column and re-boiler. Heating boils off the absorbed water vapor, after which the water dry lean glycol is cooled in a heat recovery system and pumped back to the absorber.

Power to gas (P2G) is a method for synthesizing natural gas by hydrolyzing water, to extract hydrogen, and by using a Sabatier reaction to extract carbon from carbon dioxide to form methane (CH4). Since the P2G process consumes carbon dioxide, it is often sited with a biogas plant, which emits carbon dioxide.

SWEP brazed plate heat exchangers (BPHEs) are used in the liquefaction and regasification of boil-off gas (BOG) and for pre-cooling natural gas and hydrocarbons (portable liquefaction plants). They cover applications such as mini/micro LNG production and LNG fueling stations, as well as marine and automotive/locomotive LNG applications.

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