Self-Potential Detection for Coal Spontaneous Combustion
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Solution Overview
Problem
Existing methods for detecting spontaneous combustion fire disasters in coal mines are inefficient, particularly in the goaf area, due to the complexity of geological conditions and the difficulty in accurately locating high-temperature abnormal areas.
Innovation Solution
A coal spontaneous combustion downhole detection system based on a self-potential method, which includes a self-potential detection apparatus and a processing apparatus. The system uses measuring electrodes, a reference electrode, and metal anchor rods to collect and process self-potential data, converting it into images for intuitive and precise fire zone positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature detection method is used to monitor coal spontaneous combustion, then monitoring capability is improved, but the arrangement of temperature sensors and testing process are affected by the special environment of the mine
Solution Approach 1:
The patent replaces the mechanical temperature sensor arrangement system with an electromagnetic field-based self-potential detection system. Instead of physically placing temperature sensors in the goaf area, the system uses self-potential electrodes to detect electrical potential differences generated by spontaneous combustion, thereby avoiding the operational difficulties of sensor deployment in complex mine environments.
2Measurement precision
If gas detection method is used to determine coal spontaneous combustion, then detection capability is improved, but detection depth is limited due to external interference
Solution Approach 1:
The patent introduces self-potential signal as an intermediary parameter to detect spontaneous combustion. Instead of directly measuring gas concentrations that are susceptible to external interference, the system detects electrical potential differences in the rock mass, which serve as a stable intermediary indicator of spontaneous combustion activity and enable deeper detection.
3Measurement precision
If magnetic method or resistivity method is used to detect fire zones, then accuracy in detecting closed fire zones is improved, but many problems occur in detecting downhole high-temperature abnormal areas
Solution Approach 1:
The patent applies local quality by focusing the detection on specific downhole areas where spontaneous combustion occurs. The self-potential method is specifically targeted at detecting local electrical potential anomalies in the goaf region, allowing precise localization of high-temperature abnormal areas without the limitations of broad magnetic or resistivity surveys.
4Measurement precision
If direct investigation method or drilling method is used to determine concealed fire zone, then detection accuracy is improved, but time and energy are wasted and limitations exist
Solution Approach 1:
The patent enables the rock mass itself to serve as the detection medium. Spontaneous combustion naturally generates electrical potential differences in the coal and surrounding rock, which the self-potential electrodes passively detect. This eliminates the need for active drilling or physical investigation, allowing the system to self-detect fire zones without consuming additional time or energy for direct intervention.
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
The system enables real-time monitoring and early warning of potential fire risks in the goaf area, effectively alleviating and preventing fire disasters by providing accurate and intuitive positioning of the fire zone.
Implementation Method 1
a coal spontaneous combustion downhole detection system based on a self-potential method
Data Source
AI summary
The present invention relates to the field of coal mine concealed fire zone detection, in particular to a coal spontaneous combustion downhole detection system and method based on a self-potential method. The coal spontaneous combustion downhole detection system comprises a self-potential detection apparatus and a self-potential processing apparatus; the self-potential detection apparatus comprises measuring electrodes, a reference electrode and metal anchor rods; the measuring electrodes are arranged on a top plate of a goaf roadway, are fixed to the metal anchor rods, and are in wireless connection with the reference electrode through the metal anchor rods; the self-potential processing apparatus comprises a data processing sensor for processing potential data and an imaging sensor for converting data into images; and the measuring electrodes and the reference electrode are in wireless connection with the data processing sensor.