EFFICIENCYOFVENTILATION OFDEAD-ENDDEVELOPMENT HEADINGS AFTER BLASTING OPERATIONS

Известия Томского политехнического университета: Инжиниринг георесурсов

Boris P. Kazakov¹  Evgeniy V. Kolesov¹ 

[1] Mining Institute of the Ural Branch of the Russian Academy of Sciences;

关键词: blasting operations;    cfd modelling;    dead-end heading;    ventilation efficiency;    mixing zone;    gas concentration;   

DOI  :  10.18799/24131830/2020/7/2715

来源: DOAJ

【 摘 要 】

The relevance of the researchis caused by the need toimprove the ventilation system of dead-end headings, labor reductionfor their ventilation, speeding up basic mining operations. The main aim of the research is to determin the effective ventilation parameters of a dead-end heading. Object of the researchis theventilation system of dead-end heading. Method of the researchismultiparameter three-dimensional numerical simulation based on computational fluid dynamics methods. The paper introduces the results of three-dimensional numerical simulation of gas dilution in a dead-end heading. The variable parameters of the model are the initial concentration and distribution of toxicgases in the dead-end heading after blasting operations, the distance from the dead-end headingto the airduct, the cross section area of the dead-end heading, as well as the flow rate of fresh air entering through the air duct. The calculation formula for determining the volume of the mixing zone is obtained. It was shown that the airing time of the dead-end heading does not depend on the length of the gas plug, but depends on the initial average concentration of toxic gases in the mixing zone. The values of the dimensionless efficiency coefficientKof a dead-end heading ventilation are obtained.It is shown that the coefficient K is independent onthe amount of incoming fresh air flow, and depends only on the geometric parameters of the ventilation system of the dead-end heading and takes a constant value for this configuration of the ventilation system It is shown that there is an optimal distance from the air duct to the heading face, at which the most effective removal of toxic gases occurs.

【 授权许可】

Unknown