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Cascade connection method for preparing liquefied natural gas

A liquefied natural gas, cascade technology, applied in gas fuel, petroleum industry, fuel and other directions, to achieve the effect of high reliability, good economic benefits and stable process flow

Inactive Publication Date: 2008-02-20
林寿贵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional liquefied natural gas method is to use three-stage cooling to obtain ultra-low temperature, but the purpose of the traditional liquefied natural gas method is mostly to obtain liquefied natural gas, and it does not make full use of the multi-stage refrigeration process to obtain beneficial by-products

Method used

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  • Cascade connection method for preparing liquefied natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] See Fig. 1, the present embodiment is a kind of cascading method for preparing liquefied natural gas, has the following steps:

[0030] 1. pretreatment; the feed gas in the present embodiment is the oil field natural gas that is transported from pipeline, and its air pressure is 3.24MPa, and temperature is 37.8 ℃; Component mole fraction is 83% methane, 10% C 2 + above alkanes, 7% nitrogen. The raw material gas is first compressed to 4.1MPa by a centrifugal compressor, cooled with seawater to lower its temperature to 20°C, and then the raw material gas is sequentially passed through the first absorption tower 91, which is equipped with ethanolamine solution for removing carbon dioxide and hydrogen sulfide. The second absorption tower 92 with ethylene glycol and aluminum glue and the packed tower 93 with molecular sieve adsorbent for removing moisture are housed.

[0031] In this embodiment, the pretreatment system 9 has a first absorption tower 91 , a second absorption...

Embodiment 2

[0054] This embodiment is basically the same as Embodiment 1, except that: in step ②, the temperature of the pretreated raw material gas passing through the first heat exchanger 21 is 30°C below zero through temperature control; The temperature on 23 is minus 40°C. In step ③, through temperature control, the temperature of the feed gas passing through the third heat exchanger 41 is minus 65°C; the temperature passing through the fourth heat exchanger 43 is minus 80°C; the temperature passing through the fifth heat exchanger 45 is minus 95°C ℃. In step ④, through temperature control, the temperature of the raw material gas passing through the sixth heat exchanger 61 is minus 120°C; the temperature passing through the seventh heat exchanger 63 is minus 140°C; the temperature passing through the eighth heat exchanger 65 is minus 155°C. In step ⑤, the raw material gas passes through the throttling tower 7 and then the temperature drops to minus 162°C to become a mixed material c...

Embodiment 3

[0056] This embodiment is basically the same as Embodiment 1, except that: in step ②, through temperature control, the temperature of the pretreated feed gas passing through the first heat exchanger 21 is minus 35°C; The temperature on 23 was minus 41°C. In step ③, through temperature control, the temperature of the feed gas passing through the third heat exchanger 41 is minus 70°C; the temperature passing through the fourth heat exchanger 43 is minus 85°C; the temperature passing through the fifth heat exchanger 45 is minus 100°C. In step ④, through temperature control, the temperature of the raw material gas passing through the sixth heat exchanger 61 is minus 130°C; the temperature passing through the seventh heat exchanger 63 is minus 145°C; the temperature passing through the eighth heat exchanger 65 is minus 161°C. In step ⑤, the feed gas passes through the throttling tower 7 and then the temperature drops to minus 163° C. to become a mixed material containing liquefie...

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Abstract

The invention discloses a cascading style preparation method of liquefied natural gas, comprising the following steps: (1) pretreatment: that carbon dioxide, sulfureted hydrogen and water contain in raw gas are removed; (2) raw gas primary cooling treatment: the raw gas passes through a first multi-level heat exchanging and a separating device of a first refrigeration cycle system to finish the primary cooling treatment; (3) raw gas secondary cooling treatment: the raw gas is sent by a second multi-level heat exchanging and the separating device of a second refrigeration cycle system in sequence to finish the secondary cooling treatment; (4) raw gas tertiary cooling treatment: the raw gas is sent by a third multi-level heat exchanging and the separating device of a third refrigeration cycle system in sequence to finish the tertiary cooling treatment; (5) finished product making: the raw gas is made to expand and then the temperature of the raw material is lowered to -162 DEG C to -163 DEG C, thereafter a combination of liquefied nature gas and gaseity nature gas is made; the combination passes through a gas-liquid separating tower to make the final product of the liquefied natural gas. The invention has the advantages that beneficial by-products can be obtained in the process of natural gas liquefaction.

Description

technical field [0001] The invention belongs to the technical field of producing and preparing liquefied natural gas, and in particular relates to a method for preparing liquefied natural gas. Background technique [0002] The volume of liquefied natural gas (LNG) is 1 / 600 of the gaseous state. It has high storage efficiency and flexible transportation. It is used in expansion and peak regulation of urban gas transmission and distribution systems. It is comparable to other methods such as underground gas storage and gas storage cabinets. It has more advantages than other projects, and has the advantages of small construction investment, short construction period, quick results, and small external influence factors. In addition, liquefied natural gas can also be used as a high-quality vehicle fuel. Compared with vehicle fuel, liquefied natural gas has the advantages of high octane number, good anti-knock performance, complete combustion, less exhaust pollution, long engine li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 林寿贵
Owner 林寿贵
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