Blasting Law of Liquid CO2 Phase Change in Coal Mine Based on Numerical Simulation

Abstract

In order to obtain the best CO2 blasting drilling efficiency and improve the gas permeability coefficient of the coal seam in the mining area, a research method of liquid CO2 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 CO2 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.

Study on prediction of blasting cracking radius of liquid CO2 in coal

“…Its characteristics fully meet the development needs of various countries on the coal industry. Because of the complexity of coal seam structure, many factors have led to the blasting cracking radius, which directly affect gas extraction [18,19]. Therefore, this topic has always been a focus of industry researchers to identify the factors affecting the liquid CO 2 phase change blasting cracking and to master methods to improve prediction accuracy.…”

Prediction of the Penetration Radius of Cumulative Blasting

“…According to the abovementioned analysis, many studies focused on cumulative blasting, but the effect was not found to be sufficiently rational and required improvement. Many factors will affect the cracking effect of cumulative blasting, mainly due to the complex underground geographical environment, and the propagation law of cracks after blasting was found to be relatively complex and less controllable . At the same time, there are few data processing contents related to the numerical simulation of cumulative blasting, and it is impossible to express the characteristic law of multi-factor affecting the effect of cumulative blasting.…”

“…Many factors will affect the cracking effect of cumulative blasting, mainly due to the complex underground geographical environment, and the propagation law of cracks after blasting was found to be relatively complex and less controllable. 23 At the same time, there are few data processing contents related to the numerical simulation of cumulative blasting, and it is impossible to express the characteristic law of multi-factor affecting the effect of cumulative blasting. This will require the application of reasonable methods to optimize the structural design of cumulative blasting, enhance the controllability of crack propagation after blasting, and apply a series of mathematical algorithms to couple the factors affecting the cracking effect of cumulative blasting.…”

Retracted: Blasting Law of Liquid CO2 Phase Change in Coal Mine Based on Numerical Simulation

“…This article has been retracted by Hindawi following an investigation undertaken by the publisher [ 1 ]. This investigation has uncovered evidence of one or more of the following indicators of systematic manipulation of the publication process: Discrepancies in scope Discrepancies in the description of the research reported Discrepancies between the availability of data and the research described Inappropriate citations Incoherent, meaningless and/or irrelevant content included in the article Peer-review manipulation …”

“…Tis article has been retracted by Hindawi following an investigation undertaken by the publisher [1]. Tis investigation has uncovered evidence of one or more of the following indicators of systematic manipulation of the publication process:…”