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Method of refining natural gas and natural gas refining system

a technology of natural gas and refining system, which is applied in the direction of liquefaction, separation process, lighting and heating apparatus, etc., can solve the problems of product quality deterioration, and achieve the effect of improving the product quality of liquefied natural gas

Inactive Publication Date: 2008-12-18
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]An object of the present invention is to provide a method of refining natural gas and a natural gas refining system which can improve quality of liquefied natural gas and enable separation and recovery of the hydrocarbons other than methane.
[0028]With the present invention, product quality of liquefied natural gas can be improved, and in addition hydrocarbons other than methane can be separated and recovered.

Problems solved by technology

In this case, the product quality may be deteriorated because the combustion efficiency is affected depending on a content of hydrocarbons other than methane in the liquefied natural gas.

Method used

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  • Method of refining natural gas and natural gas refining system
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Embodiment Construction

[0042]An embodiment of the present invention is described below with reference to the drawings.

[0043]FIG. 1 is a schematic diagram illustrating a natural gas refining system according to an embodiment of the present invention.

[0044]In FIG. 1, the natural gas refining system is installed in a plant for producing liquefied natural gas (LNG) from natural gas mined in a natural gas field or in an oil field. The natural gas refining system comprises a separation tank 1 (a gas / solid separating unit), a nozzle 2 (a pressure / temperature adjusting unit) for injecting natural gas into the separation tank 1, a natural gas feed line 3, a liquefied natural gas feed line 4, a gas takeoff line 5, a suspension liquid takeoff line 6, and a cyclone 7 (a solid / liquid separating unit). The natural gas feed line 3 supplies natural gas (more specifically, natural gas just mined in a natural gas field or in an oil field, or natural gas pressurized to about 60 atm (6 MPa)) to the nozzle 2. The liquefied na...

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Abstract

A method and system of refining natural gas that improves the quality of liquefied natural gas and enables separation and recovery of hydrocarbons other than methane. The method of refining natural gas containing methane; any other hydrocarbon selected from the group consisting of ethane, ethylene, propane, propylene, n-butane, isobutane, 1-butene, n-pentane, and isopentane; carbon dioxide; and hydrogen sulfide, includes adjusting a pressure and temperature of the natural gas so that the methane is in the gas phase, the other hydrocarbon in the liquid phase, and the carbon dioxide and the hydrogen sulfide in the solid phase, respectively; separating the natural gas, of which the pressure and temperature has been adjusted, into a gas containing the methane and a suspension liquid; and separating the separated suspension liquid into a liquid containing the other hydrocarbon and a solid containing the carbon dioxide and the hydrogen sulfide.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method of refining natural gas mined in a natural gas field or an oil field, and to a natural gas refining system.[0003]2. Description of the Related Art[0004]Natural gas mined in a natural gas field or an oil field is generally cooled by liquefaction equipment and converted to liquefied natural gas (LNG). Natural gas generally contains methane as a main component of liquefied natural gas and also impurities such as hydrocarbons other than methane, carbon dioxide, sulfur compounds, and mercury. When natural gas is cooled and liquefied without removal of the impurities, the problems arise, for instance, that the impurities are solidified and liquefaction equipment (such as heat transfer equipment) is blocked, or that liquefied natural gas decreases in quality. Therefore, it is necessary to remove the impurities. Examples of a method of removing the impurities, especially carbon dioxide ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25J3/00
CPCF25J3/061F25J3/0615F25J3/0635F25J3/064F25J3/067F25J2205/10F25J2205/20F25J2210/02F25J2210/04F25J2210/62F25J2215/04F25J2220/64F25J2220/66F25J2240/40F25J2270/904Y02C10/12B01D21/267B01D2221/04Y02C20/40
Inventor HINO, YUUKOASANO, TAKASHIKAMOSHIDA, MAMORU
Owner HITACHI LTD
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