Refrigeration system for a natural gas liquefaction process

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

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F25J 5/00 (2006.01) F25J 1/02 (2006.01) F25J 3/00 (2006.01)

Patent

CA 2090811

Provided is an improved refrigeration system for pre-cooling natural gas or cooling a mixed refrigerant for natural gas liquefaction in a propane refrigeration process widely used for the liquefaction of natural gas. The system comprises a plurality of plate-fin heat exchangers preferably arranged in a parallel relationship for passing a propane refrigerant as a vertical flow and pre-cooling natural gas or cooling a mixed refrigerant for liquefying natural gas, and a thermo siphon drum for the propane refrigerant consisting of a horizontally disposed, laterally elongated tank. Because the passages of the heat exchanger for the natural gas or the mixed refrigerant extend over their entire length in mutually separate relationship, even when the propane refrigerant, the natural gas or the mixed refrigerant is in both gas and liquid phases, a high efficiency of heat transfer can be attained, and the size of the heat exchanger can be reduced. In particular, from an economic view point, it is preferable if the thermo siphon drum serves also as a flash tank.

Système frigorifique amélioré pour le refroidissement préalable du gaz naturel ou le refroidissement d'un frigorigène mixte servant à la liquéfaction du gaz naturel dans un système frigorifique au gaz propane très utilisé en liquéfaction du gaz naturel. Le système comprend : de nombreux échangeurs thermiques à ailette en plaques, disposés, de préférence, en parallèle, afin de permettre au frigorigène propane de s'écouler verticalement; et un récipient thermique équipé d'un siphon destiné au frigorigène propane et constitué d'un réservoir latéralement allongé, disposé horizontalement. Comme les passages des échangeurs de chaleur s'étendent sur toute leur surface et sont indépendants les uns des autres, il est possible d'obtenir un transfert de chaleur hautement efficace, que le frigorigène propane, le gaz naturel ou le frigorigène mixte soient en phase gazeuse ou liquide, ce qui permet de réduire la dimension de l'échangeur de chaleur. Il est notamment préférable, du point de vue coûts, que le récipient thermique serve aussi de réservoir à vaporisation instantanée.

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