METHOD FOR PRODUCING A FLOW RICH IN METHANE AND A FLOW RICH IN C2+ HYDROCARBONS, AND ASSOCIATED INSTALLATION

摘要

This method envisions cooling the supply flow in a first heat exchanger, separation in a first separation flask in order to produce a light upper flow and a heavy lower flow and dividing the light upper flow into a supply fraction of a dynamic pressure reduction turbine and a supply fraction of a first distillation column. A cooled reflux flow is formed from an effluent from a dynamic pressure reduction turbine, the portion of the effluent being cooled and at least partially liquefied in a heat exchanger. The cooled reflux flow is introduced from the heat exchanger into the first distillation column.

主权项

1. A method of producing a flow rich in methane and a flow rich in C2+ hydrocarbons from a supply flow containing hydrocarbons, the method comprising:
separating the supply flow into a first fraction of the supply flow and at least a second fraction of the supply flow; introducing the first fraction of the supply flow into a first heat exchanger; cooling the first fraction of the supply flow in the first heat exchanger; introducing the cooled first fraction of the supply flow into a first separation flask in order to produce a light upper flow and a heavy lower flow; dividing the light upper flow into a turbine supply fraction and a column supply fraction; pressure reducing the turbine supply fraction in a first dynamic pressure reduction turbine and introducing at least a portion of the turbine supply fraction subjected to pressure reduction into the first turbine in a middle portion of a first distillation column; cooling and at least partially condensing the column supply fraction and pressure reducing and introducing at least a portion of the cooled column supply fraction into an upper portion of the first distillation column; introducing the heavy lower flow into a second separation flask in order to produce an upper gas fraction and a lower liquid fraction; pressure reducing the lower liquid fraction and introducing the lower liquid fraction in the middle portion of the first distillation column; cooling and at least partially condensing the upper gas fraction; recovering a lower column flow at the bottom of the first distillation column, the flow rich in C2+ hydrocarbons being formed from the lower column flow; recovering and reheating of an upper column flow rich in methane; compressing at least a fraction of the upper column flow in at least a first compressor coupled to the first dynamic pressure reduction turbine and in at least a second compressor; forming the flow rich in methane from the reheated and compressed upper column flow; removing an extraction flow from the upper column flow; cooling the extraction flow in a second heat exchanger and introducing the cooled extraction flow into an upper portion of the first distillation column; introducing at least a portion of the second fraction of the supply flow into a second dynamic pressure reduction turbine, separate from the first dynamic pressure reduction turbine; forming an effluent from the second dynamic pressure reduction turbine; cooling and at least partly liquefying at least a portion of the effluent from the second dynamic pressure reduction turbine in a downstream heat exchanger in heat exchange relationship with at least a fraction of the upper column flow, the downstream heat exchanger being separate from the second heat exchanger; forming a cooled reflux flow from the portion of the effluent cooled in the downstream heat exchanger; and introducing the cooled reflux flow from the downstream heat exchanger into the first distillation column.