公开(公告)号：US11703276B2

公开(公告)日：2023-07-18

申请号：US17447345

申请日：2021-09-10

Applicant: ExxonMobil Technology and Engineering Company

Inventor： Sorin T. Lupascu ,  Yow-Yeen Lee

IPC: F25J1/00 ,  F25J1/02

CPC classification number: F25J1/0022 ,  F25J1/005 ,  F25J1/0052 ,  F25J1/0055 ,  F25J1/0072 ,  F25J1/0082 ,  F25J1/0087 ,  F25J1/0218 ,  F25J1/0236 ,  F25J1/0271 ,  F25J1/0274 ,  F25J1/0283 ,  F25J2220/64

Abstract: A system and method for producing liquefied natural gas (LNG) from a natural gas stream. Each of a plurality of LNG trains liquefies a portion of the natural gas stream to generate a warm LNG stream in a first operating mode, and a cold LNG stream in a second operating mode. A sub-cooling unit is configured to, in the first operating mode, sub-cool the warm LNG streams to thereby generate a combined cold LNG stream. The warm LNG streams have a higher temperature than a temperature of the cold LNG streams in the second operating mode and the combined cold LNG stream. The combined cold LNG stream has, in the first operating mode, a higher flow rate than the flow rate of the cold LNG streams in the second operating mode.

公开(公告)号：US11747081B2

公开(公告)日：2023-09-05

申请号：US17649240

申请日：2022-01-28

Applicant: ExxonMobil Technology and Engineering Company

Inventor： Ashley R. Guy ,  Sorin T. Lupascu ,  Donna J. Parker ,  Yow Yeen Lee

IPC: F25J1/02 ,  F02C7/277 ,  F25J1/00

CPC classification number: F25J1/0287 ,  F02C7/277 ,  F25J1/0022 ,  F25J1/0052 ,  F25J1/0055 ,  F25J1/0072 ,  F25J1/0087 ,  F25J1/029 ,  F25J1/0216 ,  F25J1/0218 ,  F25J1/0236 ,  F25J1/0245 ,  F25J1/0248 ,  F25J1/0283 ,  F25J1/0292 ,  F25J1/0295 ,  F25J1/0296 ,  F25J1/0298 ,  F25J2215/64 ,  F25J2215/66 ,  F25J2220/64 ,  F25J2230/20 ,  F25J2230/22 ,  F25J2280/10

Abstract: A drive system for liquefied natural gas (LNG) refrigeration compressors in a LNG liquefaction plant. Each of three refrigeration compression strings include refrigeration compressors and a multi-shaft gas turbine capable of non-synchronous operation. The multi-shaft gas turbine is operationally connected to the refrigeration compressors and is configured to drive the one or more refrigeration compressors. The multi-shaft gas turbine uses its inherent speed turndown range to start the one or more refrigeration compressors from rest, bring the one or more refrigeration compressors up to an operating rotational speed, and adjust compressor operating points to maximize efficiency of the one or more refrigeration compressors, without assistance from electrical motors with drive-through capability and variable frequency drives.