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A Method of Fluidized Mining in Steeply Inclined Coal Seam

A steep incline, coal mining technology, applied in surface mining, earthwork drilling, underground mining, etc., can solve the problems of increasing the difficulty of coal mining and support, low mining efficiency, spontaneous combustion of coal seams, etc., to alleviate the phenomenon of surface subsidence, The effect of improving safety performance and reducing mining cost

Inactive Publication Date: 2019-06-21
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology of steeply inclined mining, because the coal blocks mined in the working face can slide down automatically, it may cause the support equipment to slip and hurt people; Coal mining and support are difficult; in addition, due to the complex geological structure of the steeply inclined coal seam, the advancing speed of the coal mining face is slow, resulting in low mining efficiency and severe spontaneous combustion of the coal seam
[0004] In summary, due to the particularity of the structure of the steeply inclined coal seam, it is difficult to mechanize, resulting in a low recovery rate of the steeply inclined coal seam and a low in-situ conversion rate of coal

Method used

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  • A Method of Fluidized Mining in Steeply Inclined Coal Seam
  • A Method of Fluidized Mining in Steeply Inclined Coal Seam
  • A Method of Fluidized Mining in Steeply Inclined Coal Seam

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] According to the geological conditions of a certain mine, the dip angle of the coal seam is 80°, the average thickness is 6.5m, and the false roof of the coal seam is black mudstone, generally 0.3m thick. The immediate roof is gray mudstone, generally 1.5m thick, with relatively stable lithology, and the floor is Maokou limestone. The coal seam is gray-black and shiny, with vitreous coal strips, layered and scaly structures, brittle, brittle and moist.

[0069] Using this technical method, formulate the operation steps as follows:

[0070] (1) Preparation of microbial strains: the high-efficiency biogas fermentation powder of Luneng Company; the technical indicators of the high-efficiency biogas fermentation powder are: cellulase activity [u / g (ml)] ≥ 30.0, amylase activity [u / g (ml)] ≥ 10.0, carbon content 18-22%, ammonia content 18-31%, moisture (%) ≤ 20.0, pH 5.5-7.5, powder.

[0071] (2) Depending on the existing layout of the industrial square, the main well and ...

Embodiment 2

[0081] The main coal seam of a working face occurs at the top of the Taiyuan Formation, 3-5m away from the K3 sandstone at the top and 30-50m away from the L3 limestone at the bottom. The thickness of the coal seam is 6-8m, with an average of 6.8m, and the thickness variability is large; the maximum inclination of the coal seam is 62°, with an average of 58°. The rock is separated from the layer, and it is easy to become soft after absorbing water; the basic top is siltstone, 8m thick, gray, with a certain horizontal bedding, thin coal seam, easy to separate layer, and relatively complete blunt-ribbed reed stone can be seen on the layer; directly The bottom plate is mudstone and siltstone with a thickness of 1m. The upper part contains fossils of plant roots, which are easy to swell and become soft when exposed to water.

[0082] In this embodiment, the inclination angle of the main and inclined wells is set to 58°, and the rest are the same as in Embodiment 1. The coal recove...

Embodiment 3

[0084] The stratum form of a certain coalfield is northwest-dipping, with an average dip angle of 53° and a maximum of 62°. The hardness coefficient of coal seam, roof and floor is small. The working face of the test is located in the shallow part of the mine field, with a burial depth of 242.6-195.6m, a coal seam thickness of 6-8m, an average of 6.8m, and a coal seam hardness coefficient of 0.3. The immediate roof is gray siltstone with well-developed bedding, with a thickness of 8m and a hardness factor of f=4-6.14. The basic roof is medium sandstone, mainly light gray to off-white medium-grained sandstone, partially fine sandstone, calcareous or muddy cemented, with a thickness of 5m and a hardness coefficient f=6.31. The immediate bottom is interbedded with siltstone, coal and carbonaceous mudstone, etc.

[0085] In this embodiment, the inclination angle of the main and inclined wells is set to 53°, and the rest are the same as in Embodiment 1. The coal recovery rate is ...

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Abstract

The invention provides a method for fluidized mining of a steeply inclined coal seam. The method comprises the following steps: crushing the coal seam; then decomposing coal by using microbes to prepare high-efficiency combustible gas; and recovering the combustible gas. According to the invention, coal-decomposing anaerobic bacteria capable of decomposing coal and producing a large amount of hydrogen and alkane gas are used for decomposing the crushed coal; since the combustible gas is prevented from diffusion outward and reaction space is enclosed and free of oxygen circulation in the decomposition stage of the coal, a prepared bacterial strain can be propagated in large quantities in an anaerobic environment, so the recovery rate of the steeply inclined coal seam and the on-site conversion rate of coal are greatly improved, and in-situ conversion of the coal without lifting of the coal out of a mine. Experimental results show that the method for fluidized mining of the steeply inclined coal seam has a recovery rate of up to 80% and an on-site conversion rate of nearly 100%.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for fluidized mining of steeply inclined coal seams. Background technique [0002] A steeply inclined coal seam refers to a coal seam whose inclination angle is greater than 45° during underground mining. Steeply inclined coal seam reserves account for 4% of my country's total coal reserves, and 80% of the mining areas in the southern region have steeply inclined coal seams. Regional development plays an important role. [0003] The core of coal mining is coal mining method, therefore, proper coal mining method is the key to safe and efficient mining of coal mine. The mining methods of steeply inclined coal seams are mainly inverted bench method, pseudo inclined longwall method and horizontal segment method. In the existing technology of steeply inclined mining, because the coal blocks mined in the working face can slide down automatically, it may cause the support...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21C37/00C10J3/20
CPCC10J3/20E21C37/00E21C41/18
Inventor 王家臣杨胜利唐岳松
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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