The macrokinetics parameters of the hydrocarbons combustion in the numerical calculation of accidental explosions in mines

Abstract

Параметри макрокінетики горіння вуглеводнів у чисельному розрахунку аварійних вибухів у гірничих виробках Purpose. Obtaining effective parameters of the macrokinetics of combustion of hydrocarbons in the deflagration and detonation regime for the numerical calculation of emergency explosions in mine workings. Methodology. Mathematical modeling, numerical experiment, kinetics analysis of explosive combustion reaction, analysis and synthesis. Findings. The paper analyzes the parameters of the kinetic equation against experimental data. Obtaining such data in a physical experiment for explosive chemical reactions meets serious difficulties. This is due to the size of the reaction zone not exceeding fractions of a millimeter, the lack of time resolution of experimental techniques and other factors leading to errors in direct measurements and the emergence of multiple solutions. This possibility contributes to obtaining a simultaneous numerical solution of the equations of gas dynamics and chemical kinetics. In the numerical experiment, a direct relationship between the macrokinetic characteristics of the chemical reaction and the parameters of the discontinuous flow of the reacting gas stream is established: velocity, pressure in the front and behind the front of the detonation and deflagration wave. Based on this, Arrhenius characteristics of the reaction-preexponential and effective activation energy for the hydrocarbons under consideration are obtained. Originality. Macrokinetic parameters are established for simulating one-stage ignition and burning of the most probable hydrocarbons of the mine atmosphere in the deflagration and detonation regime. Modeling of explosive

The deformation dynamics of the experimental adit's material during a coal dust explosion

“…Paper [9] established the effective parameters of the macro kinetics of hydrocarbon combustion under a deflagration and detonation mode in the numerical calculation of emergency explosions in mining workings to suppress the shock wave in the workings' voids. The mechanism of dust explosion as a combination of multiphase, turbulent, chemically reacting flows at burning a combustible aerosol was considered in [10]. However, the cited studies did not tackle the processes of dynamic vibrations in the rocks that surround mining workings, which affect the formation of an explosive environment inside a working's space.…”

Application of the emulsion explosives in the tunnels construction

“…According to the study results of the change in the detonation velocity depending on the charge diameter [18], as well as the change in explosive properties over time [19], the high energy indicators have been determined compared with TNT-containing explosives. Therefore, there is a necessity to develop and implement a new technique for calculating the DBO parameters for the construction of tunnels in the city of Dnipro, which will consider not only the energy indicators of emulsion explosive [20], its environmental friendliness for atmosphere air [21], but also the safety of conducting the blasting operations [22].…”

Increasing ecological safety during underground mining of iron-ore deposits

“…6 ZhV, grammonite 79/21, grammonite A), their danger at transportation, especially large volumes, and perspectives of development of mining enterprises, application of explosives made directly on places of explosive operations conducting is expedient. It is connected not only with safety of transportation, loading and mining operations conducting, but also with smaller volumes of allocation of detonation products [20]. As such explosives application of emulsion Ukrainit-PM-2B is offered by the authors.…”