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Process for producing liquefied natural gas by coal bed gas in mine coal

A technology for liquefied natural gas and coalbed methane, which is applied in the fields of liquefaction, refrigeration and liquefaction, and petroleum industry.

Active Publication Date: 2010-12-01
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to solve the problems in the above-mentioned prior art that liquefied methane products (LNG) with higher methane content cannot be separated from low-quality coal bed methane in coal mine areas with lower methane content, etc., and provide a The process of producing liquefied natural gas by using low-quality coalbed methane in coal mining areas with low methane content as raw material can produce liquefied natural gas (LNG) with a methane content of more than 99%.

Method used

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  • Process for producing liquefied natural gas by coal bed gas in mine coal
  • Process for producing liquefied natural gas by coal bed gas in mine coal

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Embodiment 1

[0046] The technical process of producing liquefied natural gas from coalbed methane in the coal mining area of ​​this embodiment is as follows figure 1 shown.

[0047] Coalbed methane in coal mining area is used as raw material gas after deoxygenation, desulfurization, decarbonization and drying, and its flow rate is 6000Nm 3 / h, the composition (vol%) is: CH 4 35%, N 2 65%. Pressure 4.3MPa, temperature 30°C.

[0048] It enters the first heat exchanger E1 from the pipeline 1, and after cooling, enters the fourth heat exchanger E4 through the pipeline 2 to heat the liquid in the tower, enters the second heat exchanger E2 through the pipeline 3 for further cooling, and exits the second heat exchanger E2 through the pipeline 4. Reduce the pressure to 2.1MPa through throttling, and the temperature is -141°C, and enter the low-temperature rectification tower T through the pipeline 5. Under the rectification of the cryogenic rectification tower T, liquid methane with a purity...

Embodiment 2

[0059] The technical process of producing liquefied natural gas from coalbed methane in the coal mining area of ​​this embodiment is as follows figure 2 shown.

[0060] Coalbed methane in coal mining area is used as raw material gas after deoxygenation, desulfurization, decarbonization and drying, and its flow rate is 6000Nm 3 / h, the composition (vol%) is: CH 4 35%, N 2 65%. Pressure 4.3MPa, temperature 30°C.

[0061] It enters the first heat exchanger E1 from the pipeline 1, and enters the fourth heat exchanger E4 through the pipeline 2 after cooling, heats the liquid in the tower kettle, enters the second heat exchanger E2 through the pipeline 3 for further cooling, and exits the second heat exchanger E2 by The pressure of pipeline 4 is reduced to 2.1MPa by throttling, and the temperature is -141°C. It enters the low-temperature rectification tower T from pipeline 5. Under the rectification of the low-temperature rectification tower T, liquid methane with a purity of 9...

Embodiment 3

[0074] The technical process of producing liquefied natural gas from coalbed methane in the coal mining area of ​​this embodiment is as follows image 3 shown.

[0075] Coalbed methane in coal mining area is used as raw material gas after deoxygenation, desulfurization, decarbonization and drying, and its flow rate is 6000Nm 3 / h, the composition (vol%) is: CH 4 35%, N 2 65%. Pressure 4.3MPa, temperature 30°C.

[0076] It enters the first heat exchanger E1 from the pipeline 1, and enters the fourth heat exchanger E4 through the pipeline 2 after cooling, heats the liquid in the tower kettle, enters the second heat exchanger E2 through the pipeline 3 for further cooling, and exits the second heat exchanger E2 by The pressure of pipeline 4 is reduced to 2.1MPa by throttling, and the temperature is -141°C. It enters the low-temperature rectification tower T from pipeline 5. Under the rectification of the low-temperature rectification tower T, liquid methane with a purity of 9...

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Abstract

The invention discloses a process for producing liquefied natural gas by coal bed gas in mine coal, comprising the following steps: feeding the coal bed gas in the mine coal after oxygen removal, pressurization, desulphurization, decarburization and drying treatment in a low temperature device to serve as a feed gas for low temperature separation, respectively obtaining waster nitrogen and methane gas after separation, feeding the methane gas obtained by low temperature separation in a refrigerating liquefaction plant for refrigeration and liquefaction, and obtaining the liquefied natural gas. In the process of the invention, the coal bed gas in the mine coal with a low methane content is utilized as the feed gas to produce the liquefied natural gas (LNG) with high methane content up to above 99%. The invention has simple process flow, less equipment input and maintenance cost, and can reduce power consumption of circulation and compression.

Description

technical field [0001] The invention belongs to the technical field of gas separation and liquefaction using a cryogenic method, and in particular relates to a process for producing liquefied natural gas from coalbed methane in a coal mining area. Background technique [0002] Coalbed methane is a methane-rich gas and a clean fuel. At present, my country's coalbed methane mainly comes from underground drainage, which is used to ensure the safety of coal mines. Due to the constraints of drainage technology and mining technology, the methane content of the obtained coalbed methane (coal bed methane, CMM) is about 30% to 60% (volume, the same below), and the concentration is not high, and it will occur with changes in the mining environment. Variety. Coalbed methane with such a content can usually be used as domestic fuel, utility gas and power generation when utilized. However, due to limited civil use and low power generation efficiency, most of the extracted coalbed metha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10F25J1/02
CPCF25J3/0209F25J1/0022F25J1/0037F25J1/004F25J1/0208F25J1/0237F25J3/0233F25J3/0257F25J2200/02F25J2200/72F25J2210/40F25J2250/20F25J2260/02F25J2260/20F25J2270/06F25J2270/90
Inventor 陶鹏万王大军王少楠
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND