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Apparatus for the liquefaction of natural gas and methods relating to same

A technology for liquefaction equipment and natural gas, applied in chemical instruments and methods, liquefaction, separation methods, etc., can solve the problems of "dirty", increased cost and complexity of liquefaction equipment or equipment, expensive filtration and purification systems, etc.

Inactive Publication Date: 2005-05-11
BECHTEL BWXT IDAHO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Because many sources of natural gas, such as residential or industrial supplies, are considered "dirty", the requirement to provide "clean" or "pre-purified" gas actually requires the arrangement of expensive and often complex filtration prior to the liquefaction process and purification system
this requirement does add to the cost and complexity of constructing and operating such liquefaction plants or equipment

Method used

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  • Apparatus for the liquefaction of natural gas and methods relating to same
  • Apparatus for the liquefaction of natural gas and methods relating to same
  • Apparatus for the liquefaction of natural gas and methods relating to same

Examples

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Embodiment Construction

[0133] Referring to Figures 4 and 15, an example of a process performed in the liquefaction unit 102" is illustrated. Note that the attached Figure 14 Is the same process flow diagram as Figure 4 (in combination with the additional components of Figure 3 - such as compressor 154, expander 156, etc.), but with component numbers omitted for clarity. The overall process has been described above with reference to accompanying drawing 4, and the typical conditions of gas / liquid / slurry at various positions in the entire liquefaction plant will be listed below based on the calculated operation design of the liquefaction plant 102", which are referred to as states herein point.

[0134] At state point 400, the gas exits the distribution line and enters the liquefaction unit, the gas state is about 60°F, the pressure is about 440 psia, and the flow rate is about 10,000 lbm / hr.

[0135] Splitting occurs at state points 402 and 404, with approximately 5056 lbm / hr of fluid passing throu...

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Abstract

A device and method for producing liquefied natural gas. The liquefaction unit can be connected to an unpurified natural gas source, such as a natural gas pipeline connection from a decompression station. A portion of the natural gas is withdrawn and split into a process stream (154) and a cooling stream (152). Cooling flow (152) is passed through turboexpander (156) to produce work output. The work output is used to drive the compressor (158) and compress the process flow. The compressed process stream is cooled, such as by the expanded cooling stream. The cooled and compressed process stream is split into first and second portions, and the first portion is expanded to liquefy the natural gas. Vapor is separated from liquid natural gas with a gas-liquid separator. A second portion of the cooled and compressed process stream is also expanded to cool the compressed process stream. The liquefaction process can also incorporate other components and technologies, including water purification cycles and carbon dioxide (CO2) purification cycles.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application Serial No. 10 / 086066, filed February 27, 2002, entitled "Natural Gas Liquefaction Apparatus and Related Methods." [0003] government rights [0004] Pursuant to Contract No. DE-AC07-99ID13727 between the US Department of Energy and Bechtel BWXT Idaho, LLC, the US Government has rights in the following inventions. field of invention [0005] The present invention relates generally to the compression and liquefaction of gases, and more particularly to the small-scale partial liquefaction of gases such as natural gas through the use of a combined refrigeration and expansion process. Background of the invention [0006] Natural gas is a known substitute for fuels such as gasoline and diesel. Much effort has been made to develop natural gas as an alternative fuel to overcome various disadvantages of gasoline and diesel, including production costs and post-use emis...

Claims

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Application Information

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IPC IPC(8): B01D21/26B01D36/04C10L3/10F25J1/00F25J1/02F25J3/00F25J3/08F28D7/04
CPCF25J1/0201F25J1/0244F25J1/0262F25J1/0275F25J5/002F25J2205/20F25J2205/60F25J2205/84F25J2220/62F25J2220/66F25J2220/68F25J2240/60F25J2245/90F25J2290/44F25J2290/62F28D7/04F25J1/0022F25J1/004F25J1/0045F25J1/0232F25J1/0247F25J1/0259Y10S62/904Y10S62/929F25J1/0037F25J2210/06F25J2230/30Y02C20/40F25J1/00F25J3/00
Inventor B·M·维尔丁D·N·宾汉姆M·G·麦克凯拉T·D·特纳K·T·拉特曼G·L·帕尔默K·M·克林格J·J·瓦兰尼卡
Owner BECHTEL BWXT IDAHO
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