Systems and methods for LNG production with propane and ethane recovery
First Claim
1. A LNG liquefaction plant comprising:
- a feed stream comprising methane, ethane, and propane;
a propane recovery unit configured to produce LPG and an ethane-rich feed gas from the feed stream;
an ethane recovery unit including;
a compressor configured to compress the ethane-rich feed gas to form a compressed stream, wherein the compressed stream is configured to split into a first portion and a second portion, wherein the first portion of the compressed stream, the second portion of the compressed stream, and the ethane-rich feed gas are each ethane-rich, wherein the compressed stream and the second portion of compressed stream have the same composition;
a demethanizer configured to produce an ethane liquid in an ethane bottom liquid stream and a residue gas in a methane overhead vapor stream, wherein a first portion of the residue gas is configured to flow to the demethanizer as a first reflux stream, wherein a second portion of the residue gas from the demethanizer is a methane-rich feed gas, wherein the first portion of the compressed stream is configured to flow to the demethanizer as a second reflux stream;
a first heat exchanger configured to heat the methane overhead vapor stream, cool the first portion of the residue gas, and cool the first portion of the compressed stream; and
an expander configured to expand the second portion of the compressed stream prior to entering the demethanizer; and
a LNG liquefaction unit configured to receive the methane-rich feed gas, cool the methane-rich feed gas with a refrigerant cycle, and recover LNG from the methane-rich feed gas.
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Accused Products
Abstract
A LNG liquefaction plant includes a propane recovery unit including an inlet for a feed gas, a first outlet for a LPG, and a second outlet for an ethane-rich feed gas, an ethane recovery unit including an inlet coupled to the second outlet for the ethane-rich feed gas, a first outlet for an ethane liquid, and a second outlet for a methane-rich feed gas, and a LNG liquefaction unit including an inlet coupled to the second outlet for the methane-rich feed gas, a refrigerant to cool the methane-rich feed gas, and an outlet for a LNG. The LNG plant may also include a stripper, an absorber, and a separator configured to separate the feed gas into a stripper liquid and an absorber vapor. The stripper liquid can be converted to an overhead stream used as a reflux stream to the absorber.
168 Citations
20 Claims
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1. A LNG liquefaction plant comprising:
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a feed stream comprising methane, ethane, and propane; a propane recovery unit configured to produce LPG and an ethane-rich feed gas from the feed stream; an ethane recovery unit including; a compressor configured to compress the ethane-rich feed gas to form a compressed stream, wherein the compressed stream is configured to split into a first portion and a second portion, wherein the first portion of the compressed stream, the second portion of the compressed stream, and the ethane-rich feed gas are each ethane-rich, wherein the compressed stream and the second portion of compressed stream have the same composition; a demethanizer configured to produce an ethane liquid in an ethane bottom liquid stream and a residue gas in a methane overhead vapor stream, wherein a first portion of the residue gas is configured to flow to the demethanizer as a first reflux stream, wherein a second portion of the residue gas from the demethanizer is a methane-rich feed gas, wherein the first portion of the compressed stream is configured to flow to the demethanizer as a second reflux stream; a first heat exchanger configured to heat the methane overhead vapor stream, cool the first portion of the residue gas, and cool the first portion of the compressed stream; and an expander configured to expand the second portion of the compressed stream prior to entering the demethanizer; and a LNG liquefaction unit configured to receive the methane-rich feed gas, cool the methane-rich feed gas with a refrigerant cycle, and recover LNG from the methane-rich feed gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification