Fang Bo
College of Safety Science & Engineering, Liaoning Technical University, Fuxin 123000, China.
Int J Anal Chem. 2022 Aug 27;2022:6866925. doi: 10.1155/2022/6866925. eCollection 2022.
In order to obtain the best CO blasting drilling efficiency and improve the gas permeability coefficient of the coal seam in the mining area, a research method of liquid CO phase change blasting in the coal seam based on electrochemical numerical simulation is proposed. In this paper, the electrochemical numerical simulation of coalbed methane caused by liquid CO phase change blasting is studied through theoretical analysis, the antireflection mechanism of liquid carbon dioxide gas explosion on broken coal seam is obtained, and the initial fracture length of coal body caused by gas explosion stress wave is deduced by the mathematical model. A method for improving CBM desorption with nonmechanical coal was proposed, namely, a method for electrochemically strengthening CBM desorption. A comprehensive theory and application system of liquid carbon dioxide phase change gas explosion and anti-reflection technology are established by combining theoretical analysis, experimental research, and numerical simulation with field industrial comparative experiment. According to the gas tracing method, the precise measurement of the working face shows that the impact radius of the collision caused by the explosion of the liquid carbon dioxide phase change gas is 2 m. Gas emissions increased the emissions of coal seam drilling in the affected areas by 4 to 8 times, and the gas emission attenuation coefficient decreased from 0.76 times to 0.93 times. The carbon dioxide phase change gas cracking theory and antireflection theory and their application technology system are systematically studied. The research shows that the liquid carbon dioxide phase transfer gas blasting and infiltration technology is not limited by the geological conditions of the coal seam and has the characteristics of high efficiency and inherent climate. In view of the wide area of coal mines and the harsh geological conditions of coal seams, carbon dioxide phase change gas-induced cracking antireflection technology has application prospects and expandability.
为获得最佳的CO爆破钻孔效率，提高矿区煤层的透气系数，提出了一种基于电化学数值模拟的煤层液态CO相变爆破研究方法。本文通过理论分析研究了液态CO相变爆破引起的煤层气电化学数值模拟，得到了液态二氧化碳气体爆炸对破碎煤层的增透机理，并通过数学模型推导了瓦斯爆炸应力波引起的煤体初始裂隙长度。提出了一种利用非机械破煤提高煤层气解吸的方法，即电化学强化煤层气解吸的方法。通过理论分析、实验研究、数值模拟与现场工业对比试验相结合，建立了液态二氧化碳相变气体爆炸与增透技术的综合理论与应用体系。根据气体示踪法对工作面的精确测量表明，液态二氧化碳相变气体爆炸产生的碰撞影响半径为2m。瓦斯抽放量使受影响区域的煤层钻孔瓦斯抽放量增加了4～8倍，瓦斯排放衰减系数从0.76倍降至0.93倍。系统地研究了二氧化碳相变气体致裂理论和增透理论及其应用技术体系。研究表明，液态二氧化碳相变气体爆破增透技术不受煤层地质条件限制，具有高效、环保的特点。针对煤矿面积广、煤层地质条件恶劣的情况，二氧化碳相变气体致裂增透技术具有应用前景和推广性。
