Method and system for producing a pressurized and at least partially condensed mixture of hydrocarbons

A compression system for producing a pressurized and at least partially condensed mixture of hydrocarbons, comprising:

• a feed scrubber comprising a feed drum provided with at least a feed scrubber inlet connected to a feed vapor source providing a mixture of hydrocarbons in vapor phase, and with a feed scrubber vapor outlet;
• a compression suction scrubber comprising a suction drum provided with at least a suction scrubber inlet fluidly connected to the feed scrubber vapor outlet, and with a suction scrubber outlet configured to discharge a vaporous compressor feed stream from the compression suction scrubber;
• a train of one or more compressors, comprising a suction inlet fluidly connected to the feed scrubber vapor outlet, and a compressor train discharge outlet, which train is configured to compress the vaporous compressor feed stream from the compression suction scrubber to a higher pressure thereby forming a compressed vaporous discharge stream at the discharge outlet;
• a de-superheater system configured to form a de-superheated hydrocarbon stream out of the compressed vaporous discharge stream, said de-superheater system comprising a de-superheater heat exchanger arranged in fluid communication with the compressor train discharge outlet, wherein said de-superheater system is configured to bring at least a portion of the compressed vaporous discharge stream in indirect heat exchanging contact with an ambient stream in the de-superheater heat exchanger, thereby allowing heat to flow from the compressed vaporous discharge stream to the ambient stream;
• a condenser arranged to receive at least a portion of the de-superheated hydrocarbon stream and configured to further cool the portion of the de-superheated hydrocarbon stream by allowing indirect heat exchanging against a cooling stream, whereby said portion of the de-superheated hydrocarbon stream is at least partly condensed to form the pressurized and at least partially condensed mixture of hydrocarbons;
• a de-superheater discharge conduit configured between the de-superheater system and the condenser, to establish a fluid connection between the de-superheater system and the condenser;
• a compressor train surge recycle pathway arranged between the de-superheater discharge conduit and the suction scrubber inlet to convey a recycle flow of a recycle portion of the de-superheated hydrocarbon stream, at a recycle flow rate, from the de-superheater discharge conduit to the suction inlet of the train of one or more compressors via the compression suction scrubber;
• a surge recycle valve configured in said compressor train surge recycle pathway, to control the recycle flow rate;
• a surge recycle separator drum configured in said compressor train surge recycle pathway, and arranged to remove and drain liquid constituents from the recycle portion of the de-superheated hydrocarbon stream via a liquid drain outlet, a recycle vapor outlet of the surge recycle separator drum being fluidly connected with the compression suction scrubber via the surge recycle valve;
• and
• a liquid drain conduit fluidly connecting the liquid drain outlet of the surge recycle separator drum with the feed scrubber.