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Multi-point gas injection underground gasifier and multi-point gas injection underground gasification method

A technology of underground gasification and gas injection point, which is applied in coal gasification, underground mining, construction, etc., can solve the problems of low output of gas products and large fluctuation of components, so as to increase the combustion working area, expand the production scale, and reduce the operation effect of difficulty

Active Publication Date: 2017-10-27
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Embodiments of the present invention provide a multi-point gas injection underground gasifier and a gasification method using it, which can solve the problems of low output of gas products and large fluctuations in their components

Method used

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  • Multi-point gas injection underground gasifier and multi-point gas injection underground gasification method
  • Multi-point gas injection underground gasifier and multi-point gas injection underground gasification method
  • Multi-point gas injection underground gasifier and multi-point gas injection underground gasification method

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Embodiment 1

[0051] The multi-point gas injection underground gasifier provided in this embodiment is used for gasification mining of lignite coal seams with a low degree of metamorphism. Such as Figure 5 As shown, the buried depth of the coal seam to be gasified is 255 meters, the thickness of the coal seam is 10-12 meters, the inclination angle is less than 5 degrees, and the coal type is Inner Mongolia lignite. Including 11 directional wells, 8 vertical gas outlet wells and gasification channels, etc. The working face of the gasifier consists of two directional gas injection wells (D1, D2), such as Figure 5 As shown, it is arranged in parallel along the occurrence of the coal seam at a distance of 1.5 meters above the floor of the coal seam. The coal seam section is supported by glass fiber reinforced plastic screen pipes. The length of the horizontal section is 400 meters and the spacing is 20 meters.

[0052] The steps of using the gasifier of this embodiment to carry out undergro...

Embodiment 2

[0060] The multi-point gas injection underground gasifier provided in this embodiment is applied to low-metamorphism long-flame coal seams that are easy to underground gasify. The buried depth of the coal seam to be gasified is 520 meters, the thickness of the coal seam is 14-16 meters, the inclination angle is less than 8 degrees, and the coal type is long-flame coal. Such as Figure 6 The layout of the underground gasifier shown includes 7 directional wells, 5 vertical gas outlet wells and gasification channels. The working face of the gasifier is composed of three directional gas injection wells (D1, D2, D3), which are arranged in parallel along the coal seam occurrence and 1.0 meters away from the bottom plate. The coal seam section is supported by glass fiber reinforced plastic screen pipes. The distance is 16 meters.

[0061] The steps of using the gasifier of this embodiment to carry out underground gasification include:

[0062] 1) Firstly, establish gasification fu...

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Abstract

The invention discloses a multipoint gas injection underground gasification furnace and a multipoint gas injection underground gasification method. At least two parallel gas injection wells are arranged along a coal seam attitude; controllable continuous gas injection devices are arranged in the gas injection wells; one ends of the controllable continuous gas injection devices are connected with gasification agent conveying pipes, and the other ends are positioned in a gas injection point of a working surface of the gasification furnace; and at least one gas outlet well is arranged near the tail ends of initial gas injection points of gas injection well channels. A reverse combustion mode is adopted, the gas injection point positions of all the gas injection wells are dragged continuously or intermittently, gas injection parameters are adjusted according to the gas production conditions, and repeated ignition is not needed, so that the fluctuation of a temperature field of the gasification furnace in the retreating process of the gas injection points is prevented, the whole reverse extension gasification coal mining of the working surface is realized, synthesized coal gas with stable components is obtained, the operation difficulty in the gasification production phase is reduced, and the quality of the produced coal gas is guaranteed; and the multiple gas inlet wells are dispersed to convey an oxygen-contained gasifying agent to the working surface so as to increase the combustion working area in the unit time, so that the underground gasification yield scale is enlarged.

Description

technical field [0001] The invention relates to a multi-point gas injection underground gasification furnace and a multi-point gas injection underground gasification method, belonging to the technical field of underground coal gasification. Background technique [0002] Underground coal gasification is the process of controlled combustion of underground coal to generate combustible gas through thermal and chemical effects on coal. The gasification working face is the main area where the gasification agent and the coal seam are burned and gasified to produce gas in the gasifier. Usually, a gasifier has more than one gasification working face, and each working face has more than one gasification working face. Injection point. The gasification agent in the gasification working face is injected from the gas inlet well. The arrangement and control of gas injection points determine the quality and output of the gas produced in the gasification working face. The key to the succes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/295
CPCE21B43/295
Inventor 刘刚
Owner ENN SCI & TECH DEV
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