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.