Ground Drilling Coal Mining System for Complex Seam Extraction
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Solution Overview
Problem
Deep coal mining faces challenges due to complex geological conditions, high ground stress, high temperature, and high osmotic pressure, as well as adverse effects from coal seams with small thickness and excessive inclination angles, leading to increased risks and costs.
Innovation Solution
A coal and coalbed methane mining system based on ground drilling, which includes a drilling component, a coal mining drill bit with a strip structure and multiple nozzles, and a ground facility group to provide coal cutting slurry, receive reflux slurry, and separate coal and coalbed methane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional underground mining facilities are installed for mining coal seams with small thickness and excessive inclination angle, then mining can be performed, but mining costs increase and safety risks are introduced
Solution Approach 1:
The patent extracts the mining function from traditional underground facilities and relocates it to a ground-based drilling system. The drilling system performs coal seam mining through directional boreholes without requiring underground facilities, thereby eliminating the complexity and safety risks associated with underground installations while maintaining the ability to mine challenging coal seam geometries
Solution Approach 2:
The patent introduces a slurry medium as an intermediary to transport coal particles and methane gas from the mining site to the surface. The slurry system acts as a mediator that enables material removal and gas extraction without requiring traditional underground conveyance systems, reducing device complexity while maintaining mining capability
2Quantity of substance
If deep coal mining is performed to access remaining coal resources, then coal extraction continues, but mining becomes difficult and costly due to complex geological conditions, high ground stress, high temperature, and high osmotic pressure
Solution Approach 1:
The patent replaces traditional mechanical mining systems with a hydraulic drilling system that uses high-pressure fluid jets to fragment and remove coal. This substitution eliminates the need for mechanical equipment operation in challenging deep mining conditions, reducing costs and improving productivity while maintaining coal extraction capability
Solution Approach 2:
The patent employs hydraulic pressure systems to drive the drilling process and transport materials to the surface. The hydraulic system enables efficient coal removal and gas extraction through fluid dynamics rather than mechanical means, overcoming the limitations of deep mining conditions such as high ground stress and temperature
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system allows for safe and efficient hydraulic coal mining by injecting reflux slurry containing coal and coalbed methane into a directional borehole, reducing mining costs and risks, and enabling mining of small-sized, large-angle, or complex coal seams.
Implementation Method 1
spray the coal cutting slurry to form a pressure on a coal mining site
Implementation Method 2
use the nozzles to spray the coal cutting slurry for mining the coal seam
Implementation Method 3
precipitate and separate the reflux slurry carrying the coal and the coalbed methane
Data Source
AI summary
A coal and coalbed methane mining system based on ground drilling includes: a drilling component, a coal mining drill bit and a ground facility group. The coal mining drill bit is set at a predetermined end of a directional borehole in a coal seam, connected to the drilling component through a connecting pipeline. The ground facility group is connected to the drilling component, to provide coal cutting slurry for the coal mining drill bit, receive reflux slurry carrying coal and coalbed methane, and precipitate and separate the reflux slurry carrying the coal and the coalbed methane. A coal and coalbed methane mining method based on ground drilling and related devices are also disclosed.