Device and application as well as coal underground gasification leakproofness evaluation system and method

Abstract

The invention provides a device and application as well as a coal underground gasification leakproofness evaluation system and method. The device comprises an experiment module; the experiment module is provided with an experiment cavity; the experiment cavity comprises an experiment cavity end cover and an experiment cavity barrel body which are detachably connected; the experiment cavity barrel body is composed of a double-layer cylinder body and a barrel bottom; the double-layer cylinder body comprises an inner cylinder and an outer cylinder a cavity is formed between the outer cylinder and the inner cylinder; a confining pressure applying component is arranged in the cavity and is connected with a confining pressure pipeline; a pore pressure injection hole is formed in the cylinder wall of the inner cylinder and is connected with a pore pressure pipeline; an experiment fluid injection channel and an experiment fluid output channel are arranged on the experiment cavity end cover and / or the barrel bottom of the experiment cavity barrel body; and the experiment fluid injection channel and the experiment fluid output channel both communicate with the interior of the inner cylinder of the experiment cavity. The device can simulate real occurrence conditions of coal, and specifically can simulate confining pressure and pore pressure of a deep coal seam. The device is matched with other equipment to realize coal underground gasification leakproofness evaluation considering real occurrence conditions of a coal seam.

Description

technical field [0001] The invention belongs to the technical field of underground coal gasification, and relates to a device and application, and an evaluation system and method for airtightness of underground coal gasification. Background technique [0002] Underground coal gasification combines the three major processes of well construction, coal mining and gasification. It builds the gasification reactor in the underground coal seam. According to production needs, the coal can be pyrolyzed in a controlled manner through reasonable ground control methods. gasification, producing CH 4 、H 2 This technology can effectively exploit the coal seam resources in the middle and deep (more than 800m) that cannot be developed by mining engineering, and can realize the effective production of thin coal seams, high sulfur content, high ash content, high dip angle and "three lower" coal seams. Moreover, compared with surface coal gasification, underground coal gasification has more ad...

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Problems solved by technology

[0005] At present, there are few reports on patents and research results on the evaluation test device and test method of underground coal gasification in foreign countries. The research on the airtightness of underground coal gasification mainly follows the hydraulic pressure stabilization loading system developed by China University of Mining and Technology. The system mainly has the following problems: 1. It is impossible to simulate the real underground coal gasification reaction, and it is impossible to study the impact of different gasification agent types and gasification agent processes on the airtightness of the gasification area; 2. It is impossible to simulate the occurrence state of coal seams, that is, it is impossible to simulate The vertical stress, horizontal stress and pore pressure on the coal seam; 3. It is impossible to simulate the development of the water-conducting fracture zone in the gasification area and the communication of the aquifer; 4. There is a lack of dynamic detection means for fracture development, and it is impossible to monitor the roof and floor of the coal seam during the gasification process. Dynamic detection of damage evolution and crack development

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