Method for producing a C3+ hydrocarbon-rich fraction and a methane- and ethane-rich stream from a hydrocarbon-rich feed stream, and related facility
First Claim
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1. A method for producing a C3+ hydrocarbon-rich cut and a methane- and ethane-rich stream, from a feed stream containing hydrocarbons, the method comprising:
- partially cooling and condensing a first fraction of the feed stream in a first heat exchanger to form a first cooled fraction;
injecting the first cooled fraction into a first separating flask to form a first gas headstream and a first liquid bottoms stream;
injecting at least part of the first headstream into a first dynamic expansion turbine;
forming a first feed stream of a first column from the first expanded fraction coming from the first dynamic expansion turbine and injecting the first feed stream into the lower part of a first column to recover a first headstream and a first bottoms stream;
heating at least part of the first headstream in a second heat exchanger then in the first heat exchanger, and compressing at least part of the heated headstream in a first compressor coupled to the first turbine, then in a second compressor to form the methane- and ethane-rich stream;
injecting the first bottoms stream into a second fractionating column to recover a second headstream and a second bottoms stream;
forming the C3+ hydrocarbon-rich cut from the second bottoms stream;
at least partially cooling and condensing the second headstream, advantageously in the first heat exchanger, and injecting the second partially condensed headstream into a head separating flask to form a second gas headstream and a second liquid bottoms stream;
injecting the second liquid bottoms stream in reflux into the second fractionating column;
at least partially cooling and condensing the second gas headstream, advantageously in the second heat exchanger;
expanding the second partially condensed headstream and injecting into the first column;
injecting at least part of the first bottoms stream into the first column and/or into the second fractionating column;
separating the feed stream into the first fraction of the feed stream and a second fraction of the feed stream;
injecting at least part of the second fraction of the feed stream into a second dynamic expansion turbine to form a second expanded fraction;
cooling at least part of the second expanded fraction by heat exchange with at least part of the first headstream coming from the first column;
forming a second feed stream of the first column from the second cooled expanded fraction; and
injecting the second feed stream into the first column.
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Abstract
The method according to the invention comprises the separation of a feed stream (16) into a first fraction (60) and a second fraction (62) and the injection of at least part of the second fraction (62) into a second dynamic expansion turbine (46) to form a second expanded fraction (80).
It comprises the cooling of the second expanded fraction (80) through heat exchange with at least part of the first headstream (84) coming from a first column (28) and the formation of a second feed stream (82) of the first column (28) from the second cooled expanded fraction.
10 Citations
20 Claims
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1. A method for producing a C3+ hydrocarbon-rich cut and a methane- and ethane-rich stream, from a feed stream containing hydrocarbons, the method comprising:
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partially cooling and condensing a first fraction of the feed stream in a first heat exchanger to form a first cooled fraction; injecting the first cooled fraction into a first separating flask to form a first gas headstream and a first liquid bottoms stream; injecting at least part of the first headstream into a first dynamic expansion turbine; forming a first feed stream of a first column from the first expanded fraction coming from the first dynamic expansion turbine and injecting the first feed stream into the lower part of a first column to recover a first headstream and a first bottoms stream; heating at least part of the first headstream in a second heat exchanger then in the first heat exchanger, and compressing at least part of the heated headstream in a first compressor coupled to the first turbine, then in a second compressor to form the methane- and ethane-rich stream; injecting the first bottoms stream into a second fractionating column to recover a second headstream and a second bottoms stream; forming the C3+ hydrocarbon-rich cut from the second bottoms stream; at least partially cooling and condensing the second headstream, advantageously in the first heat exchanger, and injecting the second partially condensed headstream into a head separating flask to form a second gas headstream and a second liquid bottoms stream; injecting the second liquid bottoms stream in reflux into the second fractionating column; at least partially cooling and condensing the second gas headstream, advantageously in the second heat exchanger; expanding the second partially condensed headstream and injecting into the first column; injecting at least part of the first bottoms stream into the first column and/or into the second fractionating column; separating the feed stream into the first fraction of the feed stream and a second fraction of the feed stream; injecting at least part of the second fraction of the feed stream into a second dynamic expansion turbine to form a second expanded fraction; cooling at least part of the second expanded fraction by heat exchange with at least part of the first headstream coming from the first column; forming a second feed stream of the first column from the second cooled expanded fraction; and injecting the second feed stream into the first column. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A piece of equipment for producing a C3+ hydrocarbon-rich cut and a methane-rich stream, from a feed stream containing hydrocarbons, the equipment comprising:
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a first heat exchanger to partially cool and condense a first fraction of the feed stream to provide a first cooled fraction; a first separating flask for receiving the first cooled fraction to form a first gas headstream and a first liquid bottoms stream; a first dynamic expansion turbine for receiving at least part of the first gas headstream to provide a first expanded fraction; a first column for receiving a first feed stream formed by at least a portion of the first expanded fraction coming from the first dynamic expansion turbine in a lower part of the first column and for receiving at least a part of first liquid bottoms stream to recover a first headstream and a first bottoms stream; a second heat exchanger for heating at least part of the first headstream; and a first compressor coupled to the first dynamic expansion turbine and a second compressor to compress the heated headstream so as to form the methane-rich stream; a second fractionating column for receiving at least part of the first bottoms stream and at least a part of first liquid bottoms stream to recover a second headstream and a second bottoms stream that provides the C3+ hydrocarbon-rich cut; wherein the first heat exchanger partially cools and condenses the second headstream; a head separating flask for receiving the second partially condensed headstream to form a second gas headstream and a second liquid bottoms stream that is returned in reflux to the second fractionating column; wherein the second heat exchanger partially cools and condenses the second gas headstream; an expansion valve for expanding the second partially condensed gas headstream before the second partially condensed gas headstream is returned to the first column in reflux; a second dynamic expansion turbine for receiving at least part of a second fraction of the feed stream to form a second expanded fraction; and wherein the second heat exchanger cools at least part of the second expanded fraction which forms a second feed stream to the first column.
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19. A piece of equipment for producing a C3+ hydrocarbon-rich cut and a methane rich stream, from a feed stream containing hydrocarbons, the equipment comprising:
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a first heat exchanger to partially cool and condense a first fraction of the feed stream to provide a first cooled fraction; a first separating flask for receiving the first cooled fraction to form a first gas headstream and a first liquid bottoms stream; a first dynamic expansion turbine for receiving at least part of the first gas headstream to provide a first expanded fraction; a first column for receiving a first feed stream formed by at least a portion of the first expanded fraction coming from the first dynamic expansion turbine in a lower part of the first column and for receiving at least a part of first liquid bottoms stream to recover a first headstream and a first bottoms stream; a second heat exchanger for heating at least part of the first headstream; and a first compressor coupled to the first dynamic expansion turbine and a second compressor to compress the heated headstream so as to form the methane-rich stream; a second fractionating column for receiving at least part of the first bottoms stream and at least a part of first liquid bottoms stream to recover a second headstream and a second bottoms stream that provides the C3+ hydrocarbon-rich cut; wherein the first heat exchanger partially cools and condenses the second headstream; a head separating flask for receiving the second partially condensed headstream to form a second gas headstream and a second liquid bottoms stream that is returned in reflux to the second fractionating column; wherein the second heat exchanger partially cools and condenses the second gas headstream; an expansion valve for expanding the second partially condensed gas headstream before the second partially condensed gas headstream is returned to the first column in reflux; a second dynamic expansion turbine for receiving at least part of a second fraction of the feed stream to form a second expanded fraction; and a downstream heat exchanger cools at least part of the second expanded fraction by heat exchange with at least part of the first headstream coming from the first column, which forms a second feed stream to the first column. - View Dependent Claims (20)
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Specification