Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Carbon dioxide blasting-based method for weakening top caving coal on hard coal seam

A carbon dioxide and top-coal caving technology, which is applied in earthwork drilling, discharge machinery, ground mining, etc., can solve problems such as increasing roadway excavation, affecting top-coal extraction, and excessive blasting hole sealing, achieving significant economic benefits. Effectiveness, obvious cracking effect, high safety effect

Active Publication Date: 2016-07-27
LIAONING TECHNICAL UNIVERSITY
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The blasting in the tunnel is to transport the tunnel and the return air tunnel to the top coal drilling and blasting on the working face. Since this method is a deep hole blasting, it is easy to cause the blast hole to be blocked too hard, and there will be blasting blind areas at both ends of the working face. It will affect the extraction of the top coal. The amount of work required by this method is large, and the blasting process conflicts with the belt conveyor system for transportation along the trough; the blasting weakening of the process lane fully utilizes the crushing process in which the bearing pressure can be refractured after the blasting is weakened. It achieves the purpose of reducing the lumpiness and increasing the recovery rate of the top coal, but it increases the excavation amount of the roadway, which makes the investment in the working face larger

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Carbon dioxide blasting-based method for weakening top caving coal on hard coal seam
  • Carbon dioxide blasting-based method for weakening top caving coal on hard coal seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] In this embodiment, the method for caving top coal in weakened hard coal seams based on carbon dioxide blasting, the thickness of the coal seam is 12m, and the comprehensive mechanized top coal caving method is used for mining, the mining height is 3m, and the coal caving height is 7m. Such as figure 1 , figure 2 shown, follow the steps below:

[0022] (1) During the process of coal seam recovery, between the top beams of the hydraulic supports 2 and near the roof of the coal wall, every 5 hydraulic supports are set to penetrate the top coal 7 coal body to reach the coal seam roof 6 Borehole 5, drill hole 5 It forms a certain inclination angle α45o with the coal seam roof 6, and the length L of the borehole 5 is 10m;

[0023] (2) Put the carbon dioxide cracker in the drill hole 5, insert it to the bottom of the hole, seal the hole with a bag type or rubber sealer, the length of the hole is 1.5m, and set the connecting wire of the flystop, use the explosive The heate...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of coal mining, in particular to a carbon dioxide blasting-based method for weakening top caving coal on a hard coal seam. The method comprises the steps of setting drill holes penetrating through a top caving coal body to a coal seam roof at an interval of 5 to 8 hydraulic supports at the roof close to the coal wall between top beams of the two hydraulic supports, placing a carbon dioxide fracturing device in the drill holes, sequentially blasting carbon dioxide according to the drill hole order, and finally, generating fractures in the hard top coal, and weakening the strength. After the hard top coal is weakened by carbon dioxide blasting, the top-coal recovery rate is improved by 20% to 30% compared with that prior roof fracturing, the fracturing effect is obvious, and the economic benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of coal mining, in particular to a method for caving top coal in weakened hard coal seams based on carbon dioxide blasting. Background technique [0002] In the top-coal caving mining of hard coal seams, the outstanding technical problems encountered are that the top-coal cannot be fully broken by itself, the top-coal caving has a large degree of lumpiness, and it cannot be released from the support coal opening, resulting in a low recovery rate of coal resources. Most of the leftover coal leaves hidden dangers of spontaneous combustion and fire, which threatens mine safety. The existing methods to solve this problem are coal seam high-pressure water injection or blasting. [0003] Among them, the high-pressure water injection in the coal seam always produces cracks under the action of the support pressure, and the high-pressure water is easy to leak out along the original cracks in the coal seam (including ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E21C41/18E21C37/14
CPCE21C37/14E21C41/18
Inventor 朱志洁陈蓥宋卫华张宏伟李胜韩军霍丙杰汤国水兰天伟孙宝志
Owner LIAONING TECHNICAL UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com