Balancing power in split mixed refrigerant liquefaction system

A refrigerant and power technology, used in refrigeration and liquefaction, liquefaction, refrigerators, etc., can solve problems such as large driving power, consumption, and inability to fully utilize available power.

Active Publication Date: 2020-02-14
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes propane and HP MR compressor drives to typically consume the maximum available drive power during the warmer months.
However, LP and MP MR compressor drivers cannot fully use the available power
Therefore, for configuration, production drops during these hotter months because less power is available and not fully utilizing all available power
Conversely, in conditions where the ambient temperature is cooler than designed, the LPMR / MP MR compressors typically consume maximum drive power, leaving unused power on the propane / HP MR compressor train

Method used

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  • Balancing power in split mixed refrigerant liquefaction system
  • Balancing power in split mixed refrigerant liquefaction system
  • Balancing power in split mixed refrigerant liquefaction system

Examples

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Embodiment Construction

[0080] The ensuing detailed description provides preferred exemplary embodiments only, and is not intended to limit the scope, applicability, or configuration of the claimed invention. Rather, the ensuing detailed description of the preferred exemplary embodiment will provide those skilled in the art with an enabling description for implementing a preferred exemplary embodiment of the claimed invention. Various changes may be made in the function and arrangement of elements without departing from the spirit and scope of the claimed invention.

[0081] Reference numerals introduced in the specification in connection with a drawing may be repeated in one or more subsequent figures without additional description in the specification, in order to provide context for other features.

[0082] In the claims, letters are used to identify claimed steps (eg (a), (b) and (c)). These letters are used to facilitate reference to method steps and are not intended to denote an order in which...

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Abstract

A split mixed refrigerant (MR) natural gas liquefaction system, where low-pressure (LP) and medium pressure (MP) MR compressors are driven by a first gas turbine and a propane compressor and a high-pressure (HP) MR compressor is driven by a second gas turbine, is disclosed. The split MR liquefaction system is configured to adjust the characteristics of the HP MR compressor to require less power when less power is available and more power when more power is available compared to the system's design point. Such adjustments allow for shifting the balance of power between the propane compressor and the HP MR compressor to improve LNG production efficiency.

Description

Background technique [0001] Many liquefaction systems for cooling, liquefying and optionally cooling natural gas are known in the art, such as single mixed refrigerant ("SMR") cycle, propane precooled mixed refrigerant ("C3MR") cycle, dual Mixed refrigerant (“DMR”) cycles, C3MR-nitrogenated (such as AP-X TM ) cycle, nitrogen or methane expansion cycle, and cascade cycle. Typically, in such systems, natural gas is cooled, liquefied and optionally subcooled by indirect heat exchange with one or more refrigerants. Various refrigerants can be used, such as mixed refrigerants, pure components, two-phase refrigerants, gas-phase refrigerants, and the like. Mixed refrigerants ("MR"), mixtures of nitrogen, methane, ethane / ethylene, propane, butane, and pentane, have been used in many baseload liquefied natural gas ("LNG") plants. The composition of the MR stream is typically optimized based on feed gas composition and operating conditions. [0002] Refrigerant circulates in a refri...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): F25B9/00
CPCF25B9/006F25J1/0022F25J1/0052F25J1/0055F25J1/0087F25J1/0216F25J1/0287F25J1/029F25J1/0292F25J1/0298F25J1/0214F25J1/0295F25J1/0218F25J1/0212F25J2230/24F25J2230/60F25B5/00F25J1/0283F25J2280/50
InventorC.M.奥特J.J.伯格A.O.韦斯特J.G.维尔曼
OwnerAIR PROD & CHEM INC