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Improved process for liquefied natural gas

A gas flow and gas phase technology, applied in the field of pressurized liquid natural gas production, can solve the problems of large investment and high operating costs

Inactive Publication Date: 2003-11-05
EXXONMOBIL UPSTREAM RES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas processing equipment typically uses chemical and / or physical solvent regeneration methods requiring substantial capital investment
In addition, operating costs are high

Method used

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  • Improved process for liquefied natural gas
  • Improved process for liquefied natural gas
  • Improved process for liquefied natural gas

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Embodiment Construction

[0047] The mass and energy balances were simulated to illustrate the embodiments shown in the figures, the results of which are presented in Tables 1, 3, 4 and 5. The data in the tables are provided for a better understanding of the solutions shown in the figures, without the invention being unnecessarily limited thereto. The temperatures and flow rates in the table are not limiting of the invention, as the temperature and flow rates can vary widely from the techniques disclosed herein.

[0048] Data were obtained using the commercially available process simulator HYSYS TM data obtained, however, can also be obtained using other commercially available process simulation programs, including HYSIM TM 、PROII TM and ASPENPLUS TM , are familiar to those skilled in the art.

[0049] The energy required to produce PLNG according to the present invention is substantially lower than the energy required to produce LNG using an expansion process at atmospheric conditions and at a tem...

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Abstract

The present invention relates to a process for liquefying methane-rich gas streams at pressures greater than about 3103 kPa (450 psia). The gas stream is expanded to a lower pressure, producing a gas phase and a liquid product at a temperature above about -112°C (-170°F) and a pressure sufficient to keep the liquid product at or below its bubble point. The gaseous and liquid products are phase separated in a suitable phase separator and the liquid product is introduced into storage for storage at a temperature above about -112°C (-170°F).

Description

field of invention [0001] The invention relates to a natural gas liquefaction method, in particular to a method for producing pressurized liquid natural gas (PLNG). Background of the invention [0002] Natural gas has become widely used in recent years due to its clean burning properties and convenience. Many sources of natural gas are located in remote regions, long distances from industrial markets for the gas. Sometimes, pipelines are used to transport the produced natural gas to industrial markets. When pipeline transportation is not feasible, the produced natural gas is usually processed into liquefied natural gas (hereinafter referred to as "LNG") for delivery to the market. [0003] A distinguishing feature of LNG plants is the need for large equipment investments. The equipment used to liquefy natural gas is usually very expensive. A liquefaction plant is made up of several basic systems, including processing gas to remove impurities, liquefaction, refrigeration,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J1/00H04W8/24B23K9/173B23K35/30B60K15/03C10L3/06C22C38/00C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16F17C1/00F17C1/14F17C3/00F17C3/02F17C7/00F17C7/02F17C13/00F17D1/08F25B19/00F25D23/00F25J1/02F25J3/02
CPCB23K9/173B23K35/3066B60K15/03006C22C38/001C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16F17C1/00F17C1/002F17C1/14F17C3/00F17C3/025F17C7/00F17C7/02F17C13/001F17C2201/0109F17C2201/0128F17C2201/035F17C2201/054F17C2203/0648F17C2205/013F17C2205/0134F17C2205/0302F17C2205/0323F17C2209/221F17C2221/033F17C2223/0153F17C2223/0161F17C2223/035F17C2227/0135F17C2227/0337F17C2227/0355F17C2260/011F17C2260/012F17C2260/032F17C2265/035F17C2265/05F17C2265/061F17C2270/0105F17C2270/0136F17D1/082F25J1/0022F25J1/0035F25J1/0037F25J1/004F25J1/0042F25J1/0087F25J1/0095F25J1/0202F25J1/0205F25J1/0208F25J1/0231F25J1/0237F25J1/025F25J1/0254F25J3/0209F25J3/0233F25J3/0242F25J3/0247F25J2200/02F25J2200/70F25J2200/72F25J2200/74F25J2205/04F25J2210/06F25J2215/64F25J2215/66F25J2220/62F25J2230/08F25J2230/30F25J2230/32F25J2230/60F25J2240/02F25J2245/90F25J2290/62F25J2210/04F25J2245/02F25J2260/02F25J1/00F25J1/02F25J3/02
Inventor E·R·索马斯R·R·伯温E·T·科尔E·L·基姆伯
Owner EXXONMOBIL UPSTREAM RES CO
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