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Method for fluidized mining of steeply inclined coal seam

A steeply inclined, coal mining technology, applied in ground mining, earthwork drilling, underground mining, etc., can solve the problems of increased difficulty in coal mining and support, spontaneous combustion of coal seams, and low mining efficiency, so as to alleviate surface subsidence, The effect of reducing mine construction costs and improving safety performance

Inactive Publication Date: 2018-11-09
CHINA UNIV OF MINING & TECH (BEIJING)
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  • 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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  • Method for fluidized mining of steeply inclined coal seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] According to the geological conditions of a certain mine, the inclination angle of the coal seam is 80°, the average thickness is 6.5m, and the pseudo roof of the coal seam is black mudstone, generally 0.3m thick. The direct 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 bands of mirror coal, layered and scaly structure, brittle, fragile and moist.

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

[0070] (1) Preparation of microbial strains: the high-efficiency biogas fermentation powder of Lanneng 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%, water content (%)≤20.0, pH 5.5-7.5, powdery.

[0071] (2) Relying on the existing industrial plaza layout, the main shaft and auxiliary shaft...

Embodiment 2

[0081] The main coal seam of a working face is located on the top of Taiyuan Formation, 3~5m above K3 sandstone and 30~50m below L3 limestone. The thickness of the coal seam is 6-8m, with an average of 6.8m, and the thickness variability is large; the maximum inclination angle of the coal seam is 62°, with an average of 58°. The direct roof is mudstone or sandy mudstone, with a thickness of 0.1-1.5m, light gray to gray, and easy to touch the upper part. The rock separates from the layer and becomes soft after absorbing water; the basic top is siltstone, 8m thick, gray, with a certain level of bedding, with thin coal seams, easy to separate layers, and relatively complete blunt-ribbed reed stone can be seen on the layer; directly The bottom plate is mudstone siltstone with a thickness of 1m. The upper part contains plant root fossils, which will easily expand and become soft when exposed to water.

[0082] In this example, the inclination angle of the main and inclined shafts is s...

Embodiment 3

[0084] The formation of a certain coal field is northwest inclined, with an average dip angle of 53° and a maximum of 62°. The hardness coefficient of coal seam, roof and floor is small. The tested working face 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 direct roof is gray siltstone with well-developed bedding, with a thickness of 8m and a hardness coefficient of f = 4 to 6.14. The basic top is medium sandstone, mainly light gray to off-white medium-grained sandstone, locally fine sandstone, calcareous or argillaceous cement, thickness 5m, hardness coefficient f=6.31. The direct bottom is siltstone, interbedded coal and carbonaceous mudstone.

[0085] In this example, the inclination angle of the main and inclined shafts is set to 53°, and the rest is the same as in Example 1. The coal recovery rate is 75% and the on-site conversion rat...

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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] Steeply inclined coal seam refers to the coal seam whose inclination angle is greater than 45° during underground mining. The reserves of steeply inclined coal seams account for 4% of my country's total coal reserves, while 80% of the mining areas in the south contain steeply inclined coal seams. Therefore, the output of steeply inclined coal seams accounts for a considerable proportion of the total output of remote mountainous areas and coal-deficient areas. 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 coal mining. The mining methods of steep coal seams are mainly inverted step method, pseudo-inclined long wall method and horizontal section method. In the existing ...

Claims

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Application Information

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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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