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A Coal Caving Technology with Interval and Equal Caving in Combined Caving in Extra-thick Coal Seam

A technology of extra-thick coal seam and process, applied in the field of coal mining, can solve the problems of difficulty in coal drawing, waste, and high gangue content of raw coal

Active Publication Date: 2020-11-13
鄂尔多斯市国源矿业开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems existing in the existing roofing mode are: 1. figure 2 As shown, the gangue in the early emptying area will quickly enter the rear before the coal on the top is released when the coal is released adjacent to the support. In actual work, when the roof is broken, a large piece of gangue will be formed. It will block the coal outlet and it is difficult to break it again, because gangue is harder than coal. The "Coal Mine Safety Regulations" stipulates that when large pieces of coal (gangue) get stuck in the coal outlet, blasting is strictly prohibited. 2. It is very easy to mix gangue when discharging coal adjacent to the support. If gangue is encountered, the coal outlet will be closed, and the recovery rate of raw coal will be low and waste will be serious; if coal continues to be discharged, the raw coal will have a high gangue rate, which will affect the quality of raw coal

Method used

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  • A Coal Caving Technology with Interval and Equal Caving in Combined Caving in Extra-thick Coal Seam
  • A Coal Caving Technology with Interval and Equal Caving in Combined Caving in Extra-thick Coal Seam
  • A Coal Caving Technology with Interval and Equal Caving in Combined Caving in Extra-thick Coal Seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as image 3 and 4 As shown, a coal caving process with equal intervals for joint caving of extra-thick coal seams includes the following steps:

[0033] S1. Grouping of hydraulic supports: when caving in extra-thick coal seams, first group the hydraulic supports into groups of three, and label them sequentially;

[0034] S2. Coal discharge in groups:

[0035] a. First, open the coal outlets of the first group of odd groups of hydraulic supports from the side. After the coal close to the supports is discharged, the upper coal sinks, and the gangue also falls to fill the top space, and the top coal is put on the top. During the process, the coal is transported away by the scraper conveyor until the coal seam drops to 1 / 3-1 / 2 of the thickness of the original coal seam, and the coal discharge port of the group of hydraulic supports is closed;

[0036] b. Open the coal outlets of the odd groups of hydraulic supports adjacent to the previous group of hydraulic support...

Embodiment 2

[0043] Such as Figure 5 As shown, a coal caving process with equal intervals for joint caving of extra-thick coal seams includes the following steps:

[0044]S1. Grouping of hydraulic supports: when caving in extra-thick coal seams, first group the hydraulic supports into groups of two in odd groups and three in even groups, and label them sequentially;

[0045] S2. Coal discharge in groups:

[0046] a. First, open the coal outlet of the first group of odd groups of hydraulic supports at the edge, and transport the coal through the scraper conveyor during the top coal caving process until the coal seam drops to 1 / 2-2 / 3 of the thickness of the original coal seam Close the coal discharge port of this group of hydraulic supports after hours;

[0047] b. Open the coal outlets of the odd groups of hydraulic supports adjacent to the previous group of hydraulic supports for coal discharge. During the top coal caving process, the coal is transported away by the scraper conveyor unt...

Embodiment 3

[0054] Such as figure 1 and 2 As shown, the coal discharge process includes the following steps:

[0055] Open the coal outlet of the single-frame hydraulic support, let the top coal flow out from the coal outlet, and close the coal outlet when the gangue on the roof is seen falling, and then press as follows figure 2 In the shown manner, the coal outlet of the adjacent single-frame hydraulic support is opened, and the coal is discharged again, and the coal discharge is stopped when gangue is encountered, and so on, until all the coal is released.

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Abstract

The invention discloses an interval equivalent coal caving process for combined roof caving of extra-thick coal seams. The process includes the steps of a, opening coal caving holes of an odd / even number of hydraulic supports, and closing the coal caving holes when half of coal is caved; b, opening coal caving holes of an odd / even number of adjacent hydraulic supports, and closing the coal cavingholes when half of coal is caved; c, executing the step b again until the odd / even number of hydraulic supports complete the coal caving to complete the first round of roof caving; d, opening the coalcaving holes of the even / odd number of hydraulic supports, and closing the coal caving holes when top waste rock appears; e, opening the coal caving holes of the even / odd number of adjacent hydraulicsupports, and closing the coal caving holes after top waste rock appears; f, executing the step e again until all the even / odd number of hydraulic supports complete the coal caving to complete the second round of roof caving; and g, opening the coal caving holes of all the odd / even number of hydraulic supports, and closing the coal caving holes of the hydraulic supports after top waste rock appears to complete roof caving. The raw coal recovery rate is increased, and the raw coal quality is ensured.

Description

Technical field: [0001] The invention relates to an interval equal-volume coal caving process for joint caving of extra-thick coal seams, which belongs to the field of coal mining. Background technique: [0002] As we all know, my country is the largest coal production and consumption country in the world. Among the existing coal reserves and production in my country, there are many methods for mining extra-thick coal seams (>12m) due to their large thickness. Existing extra-thick coal seam mining methods mainly include layered coal mining method and top-coal caving mining method. [0003] The layered coal mining method is a coal mining method in which the extra-thick coal seam is divided into several layers, and the top layer is to be laid with an artificial false roof for the lower layer. That is, the thick coal seam is divided into several layers of about 2.0-3.0m parallel to the extra-thick coal seam, and metal mesh false roofs are laid between the layers, and mining...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21F13/06
CPCE21C41/18E21F13/06
Inventor 王钢朱树来胡宝敏张爱杰任国军
Owner 鄂尔多斯市国源矿业开发有限责任公司
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