Systems and methods for hydrocarbon refrigeration with a mixed refrigerant cycle
First Claim
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1. A method for providing a cooled, reduced-pressure hydrocarbon-containing stream, said method comprising:
- (a) cooling a hydrocarbon-containing stream via indirect heat exchange with a mixed refrigerant in a closed-loop mixed refrigerant system to provide a warmed refrigerant and a cooled stream;
(b) flashing said cooled stream to provide a two-phase fluid stream, wherein said two-phase fluid stream includes the entire hydrocarbon-containing stream;
(c) introducing said two-phase fluid stream into a separator vessel;
(d) separating said two-phase fluid stream in said separator vessel to form a vapor fraction and a liquid fraction;
(e) introducing said liquid fraction into a holding vessel;
(f) compressing said vapor fraction to provide a compressed vapor stream;
(g) cooling at least a portion of said compressed vapor stream in a heat exchanger to provide a second cooled fluid stream;
(h) withdrawing said second cooled fluid stream from an outlet of said heat exchanger, wherein said second cooled fluid stream is a liquid stream; and
(i) introducing the entirety of said second cooled fluid stream into said separator vessel with said two-phase fluid stream,wherein prior to said cooling of step (a) said hydrocarbon-containing stream has a vapor fraction of less than about 0.10, wherein said cooling of step (a) is performed in a first cooling pass of said heat exchanger and said cooling of step (g) is performed in a second cooling pass of said heat exchanger, and wherein said first and said second cooling passes are separate from one another; and
wherein prior to said cooling of step (g) at least a portion of said compressed vapor stream is separated into a light component-enriched overhead stream and a light component-depleted bottoms stream in a fractionation column, and wherein said cooling of step (g) comprises cooling said light component-depleted bottoms stream to form said second cooled fluid stream, withdrawing a liquid stream from said holding vessel, wherein said liquid stream comprises less than about 5 mole percent of C1 and lighter components and has a pressure within about 10 psig of atmospheric pressure, and wherein said hydrocarbon-containing stream comprises at least about 50 volume percent of C2 and heavier components.
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Abstract
Methods and systems for reducing the pressure of a hydrocarbon-containing stream so as to provide a cooled, reduced-pressure hydrocarbon-containing stream are provided. Facilities as described herein utilize a single closed-loop mixed refrigeration system in order to facilitate transportation, loading, and/or storage of a liquefied hydrocarbon-containing material at or near atmospheric pressure. In some aspects, the facilities can include at least one separation device for removing lighter components from the feed stream, which may separately be recovered as a vapor product for subsequent processing and/or use.
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9 Claims
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1. A method for providing a cooled, reduced-pressure hydrocarbon-containing stream, said method comprising:
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(a) cooling a hydrocarbon-containing stream via indirect heat exchange with a mixed refrigerant in a closed-loop mixed refrigerant system to provide a warmed refrigerant and a cooled stream; (b) flashing said cooled stream to provide a two-phase fluid stream, wherein said two-phase fluid stream includes the entire hydrocarbon-containing stream; (c) introducing said two-phase fluid stream into a separator vessel; (d) separating said two-phase fluid stream in said separator vessel to form a vapor fraction and a liquid fraction; (e) introducing said liquid fraction into a holding vessel; (f) compressing said vapor fraction to provide a compressed vapor stream; (g) cooling at least a portion of said compressed vapor stream in a heat exchanger to provide a second cooled fluid stream; (h) withdrawing said second cooled fluid stream from an outlet of said heat exchanger, wherein said second cooled fluid stream is a liquid stream; and (i) introducing the entirety of said second cooled fluid stream into said separator vessel with said two-phase fluid stream, wherein prior to said cooling of step (a) said hydrocarbon-containing stream has a vapor fraction of less than about 0.10, wherein said cooling of step (a) is performed in a first cooling pass of said heat exchanger and said cooling of step (g) is performed in a second cooling pass of said heat exchanger, and wherein said first and said second cooling passes are separate from one another; and wherein prior to said cooling of step (g) at least a portion of said compressed vapor stream is separated into a light component-enriched overhead stream and a light component-depleted bottoms stream in a fractionation column, and wherein said cooling of step (g) comprises cooling said light component-depleted bottoms stream to form said second cooled fluid stream, withdrawing a liquid stream from said holding vessel, wherein said liquid stream comprises less than about 5 mole percent of C1 and lighter components and has a pressure within about 10 psig of atmospheric pressure, and wherein said hydrocarbon-containing stream comprises at least about 50 volume percent of C2 and heavier components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification