Method for analyzing coal and gas outburst risk in real time

Abstract

The invention relates to a method for analyzing coal and gas outburst risk in real time. The method comprises the steps of: first, arranging an air velocity sensor which is 20m far away from an outlet of an excavation roadway of a coal mine based on a current safety monitoring system of the coal mine; then, obtaining real time concentration of methane and real time air velocity of mixed air flow of a headwork face from monitoring data of the system; then, obtaining the sectional area of the headwork face and the cross sectional area of an air outlet of an hair dryer by consultation or measurement; then, calculating corresponding real time gas gushing amount per minute in the normal exploitation process according to the data; and finally, obtaining required data required according to the steps, and calculating coal and gas outburst risk analysis indexes with 15 days as a calculating period, wherein the outburst risk analysis indexes comprise crustal stress index id, gas pressure index ip, gas content index iw and coal desorption characteristic index ix.

Description

technical field [0001] The invention belongs to the technical field of coal and gas outburst prediction in driving face in safe mining of coal mines, and in particular relates to a method for analyzing the risk of coal and gas outburst in real time. Background technique [0002] Coal and gas outbursts have always been a major disaster affecting the safe production of coal enterprises in my country. With the increase of mining depth, the hazards of such accidents and disasters have become more and more harmful, and have become an important factor restricting the development of my country's coal industry. After decades of research and practice, scholars at home and abroad generally believe that coal and gas outbursts are the result of the combined effects of three factors: in-situ stress, gas and coal physical and mechanical properties, and form a regional and local "four in one" The technical system of comprehensive outburst prevention measures requires regional and local out...

AI Technical Summary

Problems solved by technology

The above three types of outburst prediction methods have played an important role in the prevention and control of coal and gas outbursts, but there are still the following main deficiencies: ① The widely used drilling cuttings gas desorption index K 1 or Δh 2 , drilling cuttings amount S and other contact index prediction methods are cumbersome to operate, and the prediction results are greatly affected by manpower, which can only reflect part of the influencing factors of coal and gas outburst, and cannot continuously analyze the risk of outburst

②Using parameters such as the moving average line and variance of the gas concentration curve to make predictions lacks theoretical support, and the prediction principle only stays at the stage of empirical analysis

③ Electromagnetic radiation and acoustic emission prediction methods are strictly speaking not non-contact prediction methods, which cannot realize real-time continuous analysis, and the application effect in coal and gas outburst prediction is not ideal

④Using the outstanding three-factor change characteristics of gas concentration to predict, the prediction index has a certain theoretical basis, but does not consider the impact of air volume changes on the prediction results

[0004] In addition, the mine safety monitoring and monitoring system is one of the "six major systems" for coal mine safety and avoidance. At present, almost all coal mines in the country are equipped with mine safety monitoring and monitoring systems, which realize the monitoring of gas, carbon monoxide concentration, temperature, wind speed, etc. real-time dynamic monitoring, but the current monitoring and monitoring system only realizes the monitoring and display of various parameters, and still lacks sufficient analysis and utilization of monitoring data

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