Low pressure ngl plant configurations

F - Mech Eng,Light,Heat,Weapons – 25 – J

Patent

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F25J 3/00 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2495261

A natural gas liquid plant includes a separator (103) that receives a cooled low pressure feed gas (4), wherein the separator (103) is coupled to an absorber (108) and a demethanizer (110). Refrigeration duty of the absorber (108) and demethanizer (110) are provided at least in part by expansion of a liquid portion of the cooled low pressure feed gas (4) and an expansion of a liquid absorber bottom product (19), wherein ethane recovery is at least 85 mol% and propane recovery is at least 99 mol%. Contemplated configurations are especially advantageous as upgrades to existing plants with low pressure feed gas where high ethane recovery is desirable.

L'invention concerne une installation de liquide du gaz naturel comprenant un séparateur (103) qui reçoit un gaz d'alimentation à basse pression refroidi (4), ledit séparateur (103) étant couplé à un absorbeur (108) et à un déméthaniseur (110). La tâche de réfrigération de l'absorbeur (108) et du déméthaniseur (110) s'effectue au moins partiellement par expansion d'une partie liquide du gaz d'alimentation à basse pression refroidi (4) et par expansion d'un résidu de l'absorbeur de liquide (19), la récupération de l'éthane représentant au moins 85 % en mole et la récupération du propane au moins 99 % en mole. Des modèles étudiés sont notamment avantageux en tant que versions améliorées d'installations existantes à gaz d'alimentation à basse pression, où une récupération élevée de l'éthane est souhaitable.

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