Dual Circulation Coal Mining with Mechanical Reaming and Abrasive Jet
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Solution Overview
Problem
Traditional coal mining techniques face challenges such as complex mining conditions, safety risks for workers, and low mining efficiency due to coalbed methane interference.
Innovation Solution
A coal mining system and method utilizing dual circulation drilling with mechanical reaming and abrasive jet technology, comprising a mechanical coal breaking module, an air lift reverse circulation module, a jet coal breaking module, and a coal-air-water separation module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coal mining techniques are used, then workers can perform mining operations, but safety risks increase due to human presence in boreholes and exposure to coalbed methane
Solution Approach 1:
The patent replaces mechanical drilling and coal breaking operations with a water jet system. High-pressure water jets are used to erode and break coal seams, eliminating the need for mechanical drill bits and reducing human exposure to hazardous environments. The water jet system performs cutting, drilling, and coal breaking functions that traditionally required mechanical equipment and human operators in boreholes.
Solution Approach 2:
The patent employs hydraulic principles by using high-pressure water jets to perform coal breaking and borehole drilling operations. The water jet system delivers high-pressure water through hoses to the borehole, where it erodes coal seams and transports cuttings. This hydraulic approach replaces traditional mechanical drilling and eliminates the need for complex mechanical reaming equipment and human presence in hazardous borehole environments.
2Productivity
If mechanical reaming and drilling operations are performed, then boreholes can be created, but mining efficiency decreases due to time-consuming operations and coalbed methane interference
Solution Approach 1:
The patent uses high-pressure water jets to rapidly erode coal seams and create boreholes, significantly reducing operation time compared to mechanical drilling. The water jet system can quickly cut through coal beds and transport cuttings efficiently, minimizing the time workers spend in hazardous environments and improving overall mining productivity.
Solution Approach 2:
The patent changes the operating parameters by using high-pressure water (typically 100-200 bar) to achieve rapid coal erosion and borehole formation. This high-pressure parameter enables the water jet to cut through coal seams much faster than mechanical methods, reducing operation time and increasing mining efficiency while minimizing coalbed methane interference.
3Reliability
If dual circulation drilling with water jet is used, then safe mining without human presence is achieved, but device complexity increases due to multiple modules and systems
Solution Approach 1:
The patent divides the mining system into separate functional modules: a water jet generation system, a delivery system with hoses, a borehole processing system with separation equipment, and a coal transport system. This segmentation allows each component to be optimized independently and simplifies the overall system by replacing complex mechanical reaming equipment with simpler water jet components.
Solution Approach 2:
The water jet system serves multiple functions simultaneously: it erodes coal seams, creates boreholes, breaks coal, and transports cuttings. This multi-functionality replaces the need for separate mechanical drilling, reaming, and coal breaking equipment, reducing overall system complexity while maintaining high safety standards through automated operation.
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 approach enables safe, efficient, and adaptable coal mining without human presence in boreholes, reducing risks from coal and gas outbursts and improving working conditions, while being suitable for various coal seam types and limited resources.
Implementation Method 1
The air compressor is configured to transport a coal-air-water mixture through an inner pipeline of the dual-wall drill pipe to the coal-air-water separation module
Implementation Method 2
The drill pipe rotation device, the drill pipe and the reamer bit are sequentially connected to perform rotary cutting, drilling and slotting operations on a coal seam in a borehole
Implementation Method 3
The fracturing truck, the drill pipe rotation device, the drill pipe, and the jet tool string may be sequentially connected to mine the coal scam
Implementation Method 4
separating the coal-air-water mixture to obtain coal, coalbed methane and water through the coal-air-water separation module
Data Source
AI summary
Disclosed are a coal mining system and a coal mining method. The coal mining system includes: a mechanical coal breaking module, an air lift reverse circulation module, a jet coal breaking module, and a coal-air-water separation module. The mechanical coal breaking module includes: a drill pipe rotating device, a drill pipe, and a reamer bit, sequentially connected to perform rotary cutting, drilling and slotting operations on a coal seam in a borehole. The air lift reverse circulation module includes: an air compressor and a dual-wall drill pipe. The air compressor is configured to transport a coal-air-water mixture through an inner pipeline of the dual-wall drill pipe to the coal-air-water separation module. The jet coal breaking module includes: the drill pipe rotating device, a fracturing truck, the drill pipe, and a jet tool string, sequentially connected to mine the coal seam.