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Natural gas liquefaction process for producing LNG

A technology of airflow and cooling airflow, which is applied in the field of natural gas liquefaction in the production of LNG, and can solve the problems of reducing the cycle advantage of the expander

Inactive Publication Date: 2010-12-08
EXXONMOBIL UPSTREAM RES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this coolant-based pre-cooling eliminates a major source of inefficiency in expander applications, it significantly reduces the advantage of the expander cycle, which is the removal of external coolant

Method used

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  • Natural gas liquefaction process for producing LNG
  • Natural gas liquefaction process for producing LNG
  • Natural gas liquefaction process for producing LNG

Examples

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Embodiment

[0056] Perform hypothetical mass and energy balances to elucidate Figure 4 The embodiment shown in , the results are shown in the table below. The data were obtained using the commercially available HYSYS TM (obtained from Hyprotech Ltd. of Calgary, Canada) process simulation program; however, other commercially available process simulation programs can be used to develop the data, including for example HYSIM TM 、PROII TM and ASPEN PLUS TM , those skilled in the art are familiar with these procedures. This example assumes that feed gas stream 10 has the following composition in mole percent: C 1 : 90.25%; C 2 : 5.70% : C 3 : 0.01%; N 2 : 4.0%; He: 0.04%. The data presented in the table is given for the Figure 4 The embodiments shown in are provided to provide a better understanding, but the invention is not to be construed as being unnecessarily limited thereto. In view of the teachings herein, many variations in temperature, pressure and flow rate are possible. F...

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Abstract

Embodiments of this invention relate to a process for liquefaction of natural gas and other methane-rich gas streams, and more particularly to a process for producing liquefied natural gas (LNG). In a first step of the process, a first fraction of the feed gas is withdrawn, compressed to a pressure greater than or equal to 1500 psia, cooled and expanded to a lower pressure to cool the withdrawn first fraction. The remaining fraction of the feed stream is cooled by indirect heat exchange with the expanded first fraction in a first heat exchange process. In a second step a separate stream comprising flash vapor is compressed, cooled and expanded to a lower pressure providing another cold stream. This cold stream is used to cool the remaining feed gas stream in a second indirect heat exchange process. The expanded stream exiting from the second heat exchange process is used for supplemental cooling in the first indirect heat exchange step. The remaining feed gas is subsequently expanded to a lower pressure, thereby partially liquefying this feed gas stream. The liquefied fraction of this stream is withdrawn from the process as LNG having a temperature corresponding to the bubble point pressure.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 60 / 706,798, filed August 9, 2005, and US Provisional Application No. 60 / 795,101, filed April 26, 2006. technical field [0003] Embodiments of the present invention relate to processes for the liquefaction of natural gas and other methane-rich gas streams, and more particularly, to processes for producing liquefied natural gas (LNG). Background technique [0004] Natural gas has been widely used in recent years due to its clean burning qualities and convenience. Many sources of natural gas are located in remote locations, far from any commercial market for the gas. Sometimes pipelines are used to transport the produced natural gas to commercial markets. When pipeline transportation is not feasible, the natural gas produced is typically processed into liquefied natural gas (known as "LNG") for delivery to markets. [0005] One of the most important...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J1/00
Inventor M·明特K·N·斯坦利J·B·斯通R·R·伯文L·J·科特
Owner EXXONMOBIL UPSTREAM RES CO
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