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Method for utilizing coalbed methane containing oxygen to prepare liquefied natural gas

A technology for liquefied natural gas and coalbed methane, applied in refrigeration and liquefaction, liquefaction, chemical industry, etc., can solve problems such as low refrigeration efficiency, reduced processing capacity of separation and liquefaction devices, complex structure, etc., to improve processing capacity and improve refrigeration efficiency , the effect of saving power energy

Active Publication Date: 2010-12-22
CHONGQING INST OF COAL SCI RES INST +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, this refrigeration process adopts conventional refrigeration methods such as mixed refrigeration or expansion refrigeration, which has a complex structure, and auxiliary machinery such as a turbine expansion set, the refrigeration efficiency is low, and the processing capacity of the separation and liquefaction device is reduced.

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  • Method for utilizing coalbed methane containing oxygen to prepare liquefied natural gas
  • Method for utilizing coalbed methane containing oxygen to prepare liquefied natural gas
  • Method for utilizing coalbed methane containing oxygen to prepare liquefied natural gas

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Embodiment Construction

[0031] figure 1 It is a block diagram of the technical process of the compression and purification process of the present invention, figure 2 It is a process flow diagram of the liquefaction separation process of the present invention, as shown in the figure: the method for producing liquefied natural gas by utilizing oxygen-containing coalbed methane in this embodiment includes:

[0032] A. Compression and purification process: the low-concentration oxygen-containing coal seam raw material gas from coal mines is mixed with water cooling, compressed and purified to remove impurities to obtain purified oxygen-containing coal seam gas;

[0033] B. Liquefaction separation process:

[0034] The liquefaction separation process includes:

[0035] B1. Main process process: the purified oxygen-containing coalbed methane is cooled to about -180°C through the first heat exchanger, the second heat exchanger and the third heat exchanger in turn, and then enters the rectification towe...

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Abstract

The invention discloses a method for utilizing coalbed methane containing oxygen to prepare liquefied natural gas, which comprises compress purification working procedure and liquefying separation working procedure, wherein the liquefying separation working procedure comprises a main process technology and a refrigeration technology; and in the refrigeration technology, a special mixing refrigerating fluid is combined with throttle refrigeration and a special refrigerating fluid process. In the refrigeration process of the invention, the mixing refrigeration is combined with the throttle refrigeration, which changes the existing refrigeration technology, fully and reasonably utilizes the cold energy recovery process in the technology process, and improves the freezing capacity so as to relatively improve the process capability of the device; as for the coalbed methane with not-high individual-well producing rate, the production cost can be saved; and only one set of gas booster compressor is utilized, so that the power energy is saved.

Description

technical field [0001] The invention relates to a separation method utilizing the liquefaction principle, in particular to a liquefaction separation recovery method utilizing oxygen-containing coal bed gas. Background technique [0002] Oxygen-containing coalbed methane is the primary by-product pumped out during coal mining to prevent gas explosions and outbursts and ensure safe production in coal mines; its main component is methane, and it can be seen from its composition content that coalbed methane is a relatively important energy source and chemical raw materials. However, due to its complex composition, especially the oxygen contained in coalbed methane, it is a very dangerous combustion and explosion-supporting agent, which restricts the comprehensive utilization of oxygen-containing coalbed methane; in practice, in order to save costs, coalbed methane is generally used in the coal mining process Exhausted into the atmosphere, causing extreme waste of resources and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/08
CPCY02P20/10
Inventor 胡千庭张武王长元任小坤肖露史红兵姚成林孙郁黄克海
Owner CHONGQING INST OF COAL SCI RES INST
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