Device for continuously separating methane in coalbed methane-air mixture by using hydrate

A technology of hydrate and coalbed methane, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of high cost and low efficiency, and achieve the effect of low investment cost and operating cost

Active Publication Date: 2018-04-13
CHANGZHOU UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of high

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  • Device for continuously separating methane in coalbed methane-air mixture by using hydrate
  • Device for continuously separating methane in coalbed methane-air mixture by using hydrate
  • Device for continuously separating methane in coalbed methane-air mixture by using hydrate

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment, content of the present invention is described in further detail, and promptly is the specific parameter of a set of device below:

[0034] The main component of coalbed methane (0.1MPa, 25°C) is CH 4 65%, SO 2 3%, CO 2 12%, N 2 20%, the main component is CH 4 76.5%, N 2 23.5% (CH 4 The hydrate formation temperature is 260-285K, and the formation pressure is 2-8Mpa; N 2 The formation temperature of the hydrate is 270-275k, and the formation pressure is 14-20Mpa), and the cold generated during the process of passing the exhausted tail gas through the pressure reducing valve 14 is recovered by the heat exchanger 5-5 to carry out preliminary pre-cooling of the gas to make it The temperature reaches about 10°C. Then, the coalbed methane is pressurized to 8MPa by three compressors in series, that is, the first compressor 4-1, the second compressor 4-2, and the third compressor 4-3. Behind each com...

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Abstract

The invention relates to the industrial field of petroleum natural gases and in particular to a device and a method for continuously separating methane in a coalbed methane-air mixture by using a hydrate. The device comprises one twisted strip hydrate preparation device and two laval hydrate preparation devices, wherein the twisted strip hydrate preparation device is used for improving heat and mass transfer through a twisted strip; the laval hydrate preparation devices are used for increasing supercooling degrees by using laval ejection tubes; two three-phase separation devices are arranged behind the twisted strip hydrate preparation device; one three-phase separation device is at a storage state; another one three-phase separation device is at an hydrate decomposition state; and the twostates can be transformed into each other. Through spiral flows generated by the twisted strip, the hydrate can be fed into the three-phase separation devices in a pulp manner without being blocked in the twisted strip hydrate preparation device; a coalbed gas which is not completely reacted is fed into the laval hydrate preparation devices, then methane hydrate generation conditions are met, andmethane in the coalbed gas can be further extracted; the two laval hydrate preparation devices at a preparation state and a decomposition state are available, and through transforming of the two states, an industrial requirement of continuous hydrate preparation is met.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas industry, in particular to a device which utilizes a spiral flow and a Laval nozzle to accelerate the production efficiency of hydrates and is used for extracting methane gas from mixed coalbed methane. Background technique [0002] Coalbed methane is a kind of unconventional natural gas associated with coal and stored in coal seams in an adsorbed state. It is a valuable clean energy source and the biggest threat to coal mine safety. China is rich in coalbed methane resources, and the geological resources of coalbed methane in 42 major gas-bearing basins (groups) buried within 2000m reach 36.81×10 12 m 3 , ranking third in the world. In the past two years, my country's coalbed methane new areas have achieved remarkable results, the production of coalbed methane has maintained a steady growth, and the research and development of coalbed methane technology has continued to increase. The m...

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Application Information

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IPC IPC(8): C10L3/10
CPCC10L3/10C10L3/108
Inventor 王树立蔡跃跃饶永超梁俊葛昊闫朔周诗岽李恩田赵书华
Owner CHANGZHOU UNIV
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