Method for preparing natural gas/liquefied natural gas by denitrifying nitrogen-containing methane gas

A technology of liquefied natural gas and methane gas, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of wasting pressure, loss of methane, etc., and achieve the effect of high operation flexibility

Active Publication Date: 2011-04-20
CHENGDU SEPMEM SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment process not only loses methane, nitrogen and other components, but also wastes high pressure

Method used

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  • Method for preparing natural gas/liquefied natural gas by denitrifying nitrogen-containing methane gas
  • Method for preparing natural gas/liquefied natural gas by denitrifying nitrogen-containing methane gas
  • Method for preparing natural gas/liquefied natural gas by denitrifying nitrogen-containing methane gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The flow chart of this embodiment is as follows figure 1 As shown, the nitrogen-containing methane gas enumerated in this embodiment is the gas produced by the purge gas of synthetic ammonia after membrane separation and recovery of hydrogen. The process steps of using this gas to produce liquefied natural gas (LNG) through double-tower rectification are as follows:

[0043] (1) Raw material gas precooling:

[0044] The raw material gas 101 enters the denitrification device, and is first condensed to a liquid state or partially condensed to a liquid state 102 in the condenser E101, and then the pressure is reduced to the operating pressure of the high-pressure tower (lower tower) T102 through the first pressure reducing valve I, from Stream 103 is introduced into high-pressure tower T102 for rectification;

[0045] (2) High-pressure column distillation:

[0046] In the high-pressure tower T102, the volatile components rich in nitrogen go upward along the tower height...

Embodiment 2

[0062] The flow chart of this embodiment is as follows figure 2 As shown, the nitrogen-containing methane gas enumerated in this embodiment is the gas produced by the purge gas of synthetic ammonia after membrane separation and recovery of hydrogen. The process steps of using this gas to produce liquefied natural gas (LNG) through double-tower rectification are as follows:

[0063] (1) Raw material gas precooling:

[0064] The feed gas 101 enters the denitrification device, and is first condensed to a liquid state or partially condensed to a liquid state 102 in the condenser E101, and then, if necessary, the pressure is reduced to the operating pressure of the high-pressure column T102 through the first pressure reducing valve I, and the 103 is introduced into the high-pressure tower T102 for rectification;

[0065] (2) High-pressure column distillation:

[0066] In the high-pressure tower T102, the volatile components rich in nitrogen go upward along the tower height, and ...

Embodiment 3

[0083] The flow chart of this embodiment is as follows image 3 As shown, the nitrogen-containing methane gas listed in this embodiment is the gas after catalytic deoxidation and decarbonation of coalbed methane. The process steps of using this gas to produce liquefied natural gas (LNG) through double-tower rectification are as follows:

[0084] (1) Raw material gas precooling:

[0085] The feed gas 101 enters the denitrification device, and is first condensed to a liquid state or partially condensed to a liquid state 102 in the condenser E101, and then, if necessary, the pressure is reduced to the operating pressure of the high-pressure column T102 through the first pressure reducing valve I, and the 103 is introduced into the high-pressure tower T102 for rectification;

[0086] (2) High-pressure column distillation:

[0087] In the high-pressure tower T102, the volatile components rich in nitrogen go upward along the tower height, and the stream 104 is drawn from the top of...

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Abstract

The invention discloses a method for preparing natural gas / liquefied natural gas by denitrifying nitrogen-containing methane gas, belonging to the technical field of denitrification. The method for preparing natural gas / liquefied natural gas by denitrifying nitrogen-containing methane gas comprises the following steps of: precooling raw material gas; rectifying by a high-pressure tower (lower tower); stripping by a low-pressure tower (upper tower); reheating product gas / circulating a mixed refrigerant; and the like. The method has the advantages of high methane recovery rate, high product purity and low energy consumption, and equipment related to the method has the advantages of small size and skid-mounting.

Description

technical field [0001] The invention belongs to the field of denitrification of methane-containing gases such as coalbed methane, synthetic ammonia purge gas, and methanol purge gas, and particularly relates to a method for producing natural gas through double-tower cryogenic distillation denitrification. Background technique [0002] Coal bed gas is commonly known as "gas", and its main component is CH 4 (Methane), unconventional natural gas associated with coal and stored in coal seams in an adsorbed state, has a calorific value 2-5 times that of general-purpose coal. The calorific value of 1 cubic meter of pure coalbed methane is equivalent to 1.13kg of gasoline and 1.21kg of standard coal, and its calorific value is equivalent to that of natural gas. Industrial, chemical, power generation and residential fuel. When the air concentration of coalbed methane reaches 5%-16%, it will explode when encountering an open flame, which is the root cause of coal mine gas explosion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 张惊涛
Owner CHENGDU SEPMEM SCI & TECH
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