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公开(公告)号：US12050056B2
公开(公告)日：2024-07-30
申请号：US18066369
申请日：2022-12-15
Inventor： Yijun Liu , Fritz Pierre, Jr.
CPC classification number: F25J1/0025 , F25J1/0022 , F25J1/005 , F25J1/0072 , F25J1/0222 , F25J1/0249 , F25J1/0254 , F25J2220/64 , F25J2270/902
Abstract: A method for liquefying a feed gas stream. A refrigerant stream is cooled and expanded to produce an expanded, cooled refrigerant stream. Part or all of the expanded, cooled refrigerant stream is mixed with a make-up refrigerant stream in a separator, thereby condensing heavy hydrocarbon components from the make-up refrigerant stream and forming a gaseous expanded, cooled refrigerant stream. The gaseous expanded, cooled refrigerant stream passes through a heat exchanger zone to form a warm refrigerant stream. The feed gas stream is passed through the heat exchanger zone to cool at least part of the feed gas stream by indirect heat exchange with the expanded, cooled refrigerant stream, thereby forming a liquefied gas stream. The warm refrigerant stream is compressed to produce the compressed refrigerant stream.
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公开(公告)号：US11892233B2
公开(公告)日：2024-02-06
申请号：US17453537
申请日：2021-11-04
Inventor： Fritz Pierre, Jr.
CPC classification number: F25J1/0022 , F25J1/005 , F25J1/0035 , F25J1/0037 , F25J1/0042 , F25J1/0055 , F25J1/0057 , F25J1/0072 , F25J1/0082 , F25J1/025 , F25J1/0205 , F25J1/0207 , F25J1/0208 , F25J1/0215 , F25J1/0219 , F25J1/0262 , F25J1/0263 , F25J1/0265 , F25J1/0268 , F25J2205/02 , F25J2210/60 , F25J2220/62 , F25J2230/30 , F25J2240/12 , F25J2245/90 , F25J2270/12 , F25J2270/90 , F25J2290/12
Abstract: A method and system for liquefying a methane-rich high-pressure feed gas stream using a first heat exchanger zone and a second heat exchanger zone. The feed gas stream is mixed with a refrigerant stream to form a second gas stream, which is compressed, cooled, and directed to a second heat exchanger zone to be additionally cooled below ambient temperature. It is then expanded to a pressure less than 2,000 psia and no greater than the pressure to which the second gas stream was compressed, and then separated into a first expanded refrigerant stream and a chilled gas stream. The first expanded refrigerant stream is expanded and then passed through the first heat exchanger zone such that it has a temperature that is cooler, by at least 5° F., than the highest fluid temperature within the first heat exchanger zone.
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公开(公告)号：US11815308B2
公开(公告)日：2023-11-14
申请号：US16851763
申请日：2020-04-17
Inventor： Yijun Liu , Fritz Pierre, Jr.
CPC classification number: F25J1/0022 , F25J1/0035 , F25J1/0072 , F25J1/0215 , F25J1/0237 , F25J1/0241 , F25J2205/30 , F25J2210/06 , F25J2210/62 , F25J2220/64 , F25J2230/20 , F25J2230/30
Abstract: A method and apparatus for producing liquefied natural gas. A portion of a natural gas stream is cooled in a first heat exchanger and re-combined with the natural gas stream, and heavy hydrocarbons are removed therefrom to generate a separated natural gas stream and a separator bottom stream. Liquids are separated from the separator bottom stream to form an overhead stream, which is cooled and separated to form a recycle gas stream. The recycle gas stream is compressed. A first portion of the compressed recycle gas stream is directed through the first heat exchanger and directed to the separator as a column reflux stream. The separated to natural gas stream is used as a coolant in the first heat exchanger to thereby generate a pretreated natural gas stream, which is compressed and liquefied.
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公开(公告)号：US11806639B2
公开(公告)日：2023-11-07
申请号：US16851718
申请日：2020-04-17
Inventor： Yijun Liu , Fritz Pierre, Jr.
CPC classification number: B01D1/2856 , B01D1/2884 , F25J1/004 , F25J1/0055 , F25J1/0212 , F25J1/0231 , F25J1/0267 , F25J1/0279 , F25J2210/06 , F25J2220/62 , F25J2220/64 , F25J2245/02
Abstract: A method and apparatus for producing liquefied natural gas. A portion of a natural gas stream is cooled in a heat exchanger and combined with the natural gas stream. Heavy hydrocarbons are removed from the combined natural gas stream, and the resulting separated natural gas stream is partially condensed in the first heat exchanger, with a liquid stream separated therefrom. The natural gas stream is warmed in the first heat exchanger and then is compressed and cooled. The resultant cooled compressed natural gas stream is expanded, thereby forming a chilled natural gas stream that is separated into a refrigerant stream and a non-refrigerant stream. The refrigerant stream recycled to the heat exchanger to be warmed through heat exchange with one or more process streams associated with pretreating the natural gas stream, thereby generating a warmed refrigerant stream. The warmed refrigerant stream and the non-refrigerant stream are liquefied.
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