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Thermosyphon reboiler for the denitrogenation of liquid natural gas

A liquid natural gas, thermosyphon technology, applied in the field of nitrogen separation, can solve the problem of limited flexibility, achieve the effect of large flexibility, increase process flexibility, save cost and space

Inactive Publication Date: 2012-05-02
AIR PROD & CHEM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] A disadvantage of these prior art nitrogen separation methods is that they each require that the entire liquid exiting one tray be recirculated through the reboiler
Another disadvantage is that each of them relies entirely on the liquid head in the column to drive the heat exchanger
These characteristics limit the flexibility of these methods, since the entire process must be designed to accommodate a large number of streams
A further disadvantage associated with the prior art is that the methods often require a large area for placing the equipment

Method used

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  • Thermosyphon reboiler for the denitrogenation of liquid natural gas
  • Thermosyphon reboiler for the denitrogenation of liquid natural gas
  • Thermosyphon reboiler for the denitrogenation of liquid natural gas

Examples

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example 1

[0046] In order to demonstrate in more detail some important differences between the present invention and the prior art, the ASPEN process simulator was used to run the entire natural gas liquefaction process, two embodiments of the present invention ("the process") and the US -A-5421165 disclosed in the process for comparison. The basis of the comparison is the same LNG product and the fulfilled fuel balance (the amount of LNG product flash required to drive the gas turbine used to drive the process). Corresponding reference numbers used in this example refer to the aforementioned figure 1 and US-A-5421165 (see the figure 1 ).

[0047] This process method

[0048] A. Recycling rate: 2.9

[0049] refer to figure 1 , with the expansion in the dense fluid expander 102, the low-pressure LNG stream 104 has a flow rate of 125,470 lbmol / h (56,912 kgmol / h), a pressure of 71.78 psia (494.9 kPa), and a temperature of -242.9°F (-152.7°C) and contains 2.96% N 2 , 95.47% methane...

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Abstract

The invention refers to a thermosyphon reboiler for the denitrogenation of liquid natural gas. The denitrogenation of an expanded crude LNG stream (104) is conducted in a nitrogen rejection column (150) reboiled by partial vaporization of only a portion (112) of nitrogen bottoms liquid in a thermosyphon reboiler (106) that cools the crude LNG stream before or after expansion (102). The thermosyphon reboiler can be located external of or within the sump of the column.

Description

technical field [0001] The present invention relates to a process for separating nitrogen from a liquid natural gas stream comprising nitrogen, methane and possibly heavier hydrocarbons. Background technique [0002] Raw natural gas is usually liquefied to enable storage in larger quantities in the form of liquid natural gas (LNG). Because natural gas may be contaminated with nitrogen, it is advantageous to remove the nitrogen to produce a nitrogen-reduced LNG product that meets the desired product use. Several methods of achieving nitrogen removal from LNG have been disclosed in the prior art. [0003] A simple way to separate nitrogen from an LNG stream is to isentropically expand the raw LNG stream in a turbine and then inject the LNG stream into a flash separator. The liquid product withdrawn from the flash separator contains less nitrogen than the original LNG stream, while the vapor product withdrawn contains a higher proportion of nitrogen. [0004] A different app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/02
CPCF25J2200/70F25J3/0209F25J2290/40F25J2240/30F25J2215/04F25J2250/02F25J2200/02F25J3/0233F25J3/0257
Inventor A·A·布罗斯托M·J·罗伯茨
Owner AIR PROD & CHEM INC
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