Process and equipment for liquefying air-containing coal-bed gas

A technology for coalbed methane and air, which is applied to the liquefaction process and equipment field of air-containing coalbed methane, can solve the problems of no process, potential safety hazards, low methane content, etc., and achieves convenient installation and connection, avoids air pollution, and has good safety performance. Effect

Inactive Publication Date: 2007-04-25
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the coalbed methane extracted during the coal mining process has low pressure, low methane content, and air is mixed in it. Oxygen in the air is a dangerous combustion accelerant, which brings difficulties to the processing and transportation of coalbed methane. It is even more serious to empty and waste. This problem has not been well resolved.
In the previous methods, the purity of the separation is difficult to meet the requirements, and some of them need to be heated. The air-containing coalbed methane is easy to explode at high temperature, and there are potential safety hazards, so it has not been applied.
The application of cryogenic rectification to the separation and liquefaction of air-containing coalbed methane has not yet been proposed, let alone a specific process.

Method used

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  • Process and equipment for liquefying air-containing coal-bed gas
  • Process and equipment for liquefying air-containing coal-bed gas
  • Process and equipment for liquefying air-containing coal-bed gas

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Effect test

Embodiment 1

[0030] Referring to Fig. 1 and Fig. 2, it is a schematic diagram of the liquefaction equipment of air-containing coalbed methane in Embodiment 1 of the present invention, including two major parts. Firstly, the feed gas of air-containing coalbed methane is first compressed and purified, and then liquefied and separated to obtain liquefied natural gas, wherein The cooling capacity required for the liquefaction and separation process is provided by the refrigeration system. The specific equipment and process are described as follows:

[0031] Referring to Fig. 1, it is a schematic diagram of the compression purification equipment of the present invention. It includes a filter 1, a gas-liquid separator 2, a primary compressor 3, a cooler 5, a secondary compressor 4, a cooler 6, and a molecular sieve equipment group, and the molecular sieve drying equipment group includes three molecular sieve dryers 7, 8 ,9. The first molecular sieve dryer 7 and the second molecular sieve dryer ...

Embodiment 2

[0050] Embodiment 2 The compression purification process and equipment are the same as in Embodiment 1.

[0051] Referring to Fig. 3, it is a schematic diagram of air-containing coalbed methane refrigeration equipment and liquefaction separation equipment in Embodiment 2 of the present invention. The liquefaction separation equipment comprises two stages of heat exchangers 35,36, first fractionation tower 37,38, the first fractionation tower 37 has a condenser 34, the second fractionation tower 38 has an evaporator 39, the first fractionation tower top, middle, bottom It is connected with the top, middle and bottom of the second distillation column through pipelines, and the condenser of the first fractionation column also has a gas pipeline to introduce gas into the refrigeration equipment.

[0052] The liquefaction separation process steps are as follows:

[0053] 1. The compressed and purified air-containing CBM feed gas enters the heat exchangers 35 and 36 to exchange hea...

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Abstract

The invention discloses a liquefaction technology for coal-bed gas with air, comprising compressing and purifying technology, refrigeration technology and liquefaction and separation technology. Double-grade rectifying method in low temperature is applied in the liquefaction and separation technology. Liquefaction and separation are carried out in low temperature and it is provided with high separation purity and good safety. The purity of liquefied natural gas can achieve more than 99% and the content of firedamp drained in air is only 1% or so. The resource is recycled efficiently. The invention also provides liquefaction equipment for the coal-bed gas with air.

Description

technical field [0001] The invention relates to a gas liquefaction separation equipment and process, in particular to a liquefaction process and equipment for air-containing coal bed gas. Background technique [0002] Coalbed methane is also called unconventional natural gas or mine gas, and its main component is methane. It is not only a precious clean energy, but also an important chemical raw material. my country's coalbed methane resources are extremely rich, but the development is relatively small, and there is almost no industrial application. It is known that my country's coal-bed methane discharged into the atmosphere every year accounts for one-third of the total coal-bed methane emitted by coal mining in the world. This not only causes serious air pollution, but also wastes resources. [0003] The characteristic of coalbed methane is that the output of a single well is not very high. Except for the nearby use, it is often uneconomical to lay pipelines for export....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/06
CPCF25J2240/10F25J2215/04F25J2200/04F25J3/0209F25J3/0214F25J2200/70F25J2200/72F25J2215/40F25J2210/40F25J2270/14F25J3/0233F25J1/02F25J1/0221
Inventor 杨克剑
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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