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The implementation of regional advance control is to scientifically plan and take advance measures to effectively control coal seam gas in advance, turn the outburst coal seam into a coal seam with no risk of outburst before mining, and avoid directly 'bayonet' with gas." At the national coal mine gas management site promotion meeting held from March 20 to 21, the relevant person in charge of the National Mine Safety Supervision Bureau said.
The meeting stressed that it is necessary to further strengthen the concept of safe development, practice the "two-cross" work system of gas management of "reliable ventilation, extraction standards, accurate outburst prevention, effective monitoring and management in place", and comprehensively improve the capacity and level of gas management.
The number of gas accidents and fatalities has dropped significantly
In recent years, China's coal mine gas control work has achieved remarkable results, and the number of gas accidents and fatalities has dropped significantly. Since 2021, there have been 3 major coal mine gas accidents in China, killing 38 people; Compared with the peak period of gas accidents from 2000 to 2006, the average annual number of gas accidents and the number of fatalities decreased by 98.1% and 98.9% respectively.
The achievements have benefited from the continuously scientific gas management concept, the rapid upgrading of technical equipment, and the increasingly perfect gas management work system.
With the deepening of the concept of gas management, coal mining enterprises have a deeper understanding of gas disasters, and their determination and confidence in disaster management have been significantly enhanced.
Huaibei Mining Group adheres to the gas management philosophy of "major disasters are subversive and major disasters can be prevented and controlled", and has prevented gas accidents for 17 consecutive years. China Coal Energy Group Co., Ltd. adheres to the concept of "gas control is to liberate productivity, cure gas is to develop productivity", and has achieved "zero prominence" for 10 consecutive years. Sichuan Coal Industry Group adheres to the concept of "gas must be prevented and treated" and "over-limit is an accident", and the number of gas over-limit has dropped to a single digit for three consecutive years.
All localities and coal mining enterprises regard scientific and technological equipment as the first driving force to improve the level of gas control.
Protective layer mining technology has been fully implemented, and surface well extraction technology has been widely applied. Guizhou has changed from the past "which layer of coal is thick to which layer" to the priority mining protection layer. In Anhui, Shanxi, Shaanxi and other coal mines, surface well pumping technology has been widely used to control pressure relief gas and gob gas. Huaibei Mining Group has applied the combined mining technology of well and ground, and has constructed more than 400 surface mining Wells since 2020, with the maximum gas extraction volume of 5 million cubic meters per well.
At the same time, China's underground drilling construction technology, soft coal seam anti-reflection technology is improving day by day, and positive progress has been made in drilling cut anti-reflection technology. The anti-reflection methods such as large-diameter cutting are adopted around soft and low-permeability coal seam in the Lianghuai area, and the radius of cutting is increased from 153 mm to 500 mm, which significantly improves the effect of pressure relief and anti-reflection.
The rapid upgrading of drilling rig equipment provides a solid guarantee for gas treatment. The drilling capacity of downhole drilling rig is changed from low to high, and the drilling attitude instrument is used to achieve deep and accurate drilling. Directional drilling rig from scratch, domestic independent research and development of directional drilling rig to achieve where to hit, accurate positioning. Surface drilling RIGS are widely used and can implement regional governance on the surface 5 to 8 years in advance. Breakthroughs have been made in the development of automated and intelligent drilling RIGS. Huaibei Mining Group Linhuan coal mine built the industry's first intelligent drilling line, per capita work efficiency increased by 32%, labor costs reduced by 33.3%.
The upgrading of pumping system, the breakthrough of rapid determination of gas content, and the successful application of rock tunnel shield machine have laid a solid technical and equipment foundation for gas control.
Gas control work involves a wide range of areas, strong professionalism, large capital investment, all localities, coal mining enterprises in fine management up and down the "embroidery effort", an all-round build a strong security line.
The State Council has launched the "two major battles" of small coal mine rectification and closure and gas control, greatly eliminating small coal mines that do not have the ability to control gas, and optimizing the industrial structure. The two "Opinions" and "eight hard measures" have been implemented to promote the transformation of the gas management model to "zoning management and advanced management". In light of actual conditions, Hebei, Shanxi, Anhui, Henan, Guizhou and Shaanxi have introduced measures for coal mine gas prevention and control with local characteristics. In Guizhou, in particular, the "eight measures" for coal mine gas prevention and control have been strictly implemented and detailed rules for implementation have been formulated, thus effectively curbing gas accidents. At present, Guizhou has achieved 19 consecutive months without gas fatalities and 24 consecutive months without prominent injury accidents.
Local regulatory and supervisory departments have increased law enforcement efforts on gas control, and increased efforts to crack down on various fraud activities such as drilling, pumping, monitoring, and hidden working faces, and achieved positive results. In 2024, a total of 920 hidden working faces will be cleared across the country, and 215 hidden dangers involving major accidents involving counterfeiting will be investigated and dealt with.