THE INFORMATIVENESS OF ROUTINE MONITORING OF MINE ATMOSPHERE COMPOSITION WHEN THE DIESEL FACTOR IS DOMINANT IN CALCULATING AIR CONSUMPTION
Referat
This article discusses how the required air volume for ventilating a mine that operates self-propelled diesel equipment is determined by calculating the installed engine power, and how the adequacy of the actual air supply is verified by monitoring the composition of the mine atmosphere. If the list of monitored components does not correspond to the list of substances for which the air is supplied for dilution, the verification of the calculation becomes a mere formality. The study aimed to evaluate the informative value of routine monitoring of the mine atmosphere composition as it relates to the task of diluting diesel engine exhaust products and to determine under what conditions the monitored components are capable of detecting concentrations exceeding the limit values. Actual air composition records from 24 measurement points in two ventilation shafts were used during the course of the research. A two-parameter model of the mixing of undiluted exhaust gases with mine air was developed, linking the decrease in the volume fraction of oxygen to the concentrations of carbon monoxide and nitrogen dioxide. The model was parameterized using documented limit values for undiluted exhaust gases and for the air in the working area; an analysis was performed to assess the robustness of the conclusions with respect to the ratio of these values. At all 24 measurement points, the same value of the oxygen volume fraction was recorded—20%; the sample standard deviation is zero for an air flow rate range from 0.2 to 122.4 m³/s. It is shown that when the maximum concentration of carbon monoxide is reached, the oxygen depletion is 0.16–0.66 percentage points, depending on the composition of the exhaust gases, and does not exceed 0.87 percentage points for any composition; for nitrogen dioxide, the oxygen depletion is 0.20–0.80 and 1.05 percentage points, respectively.
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Uniform Safety Rules for the Underground Development of Ore, Non-Ore, and Alluvial Deposits: Approved by Resolution No. 09/YUB-23 of March 6, 2019.
Provisional Instructions for Calculating the Amount of Air Required for Ventilation in Ore Mines. — Moscow, 1983.
Methodological Guidelines for Conducting Air-Depression Surveys and Processing Their Results at Non-Ferrous Metal Mines. — Sverdlovsk, 1980.
Halim A. Ventilation requirements for diesel equipment in underground mines — Are we using the correct values? — 2017. — Full text: DiVA repository, Luleå University of Technology, record 1134809. — URL: https://www.diva-portal.org/smash/get/diva2:1134809/ATTACHMENT01.pdf
Regulation 854 (Mines and Mining Plants) under the Occupational Health and Safety Act, Ontario, Canada; the “Ventilation requirements for diesel-powered equipment in underground mines” guideline from the Ontario Ministry of Labor, Immigration, Training, and Skills Development. — URL: https://www.ontario.ca/page/ventilation-requirements-diesel-powered-equipment-underground-mines; text of the 2023 amendments: https://www.ontario.ca/laws/docs/R23069_e.doc
Regulation 833 (Control of Exposure to Biological or Chemical Agents) under the Occupational Health and Safety Act, Ontario, Canada.
30 CFR § 57.5060. Limit on exposure to diesel particulate matter. — Code of Federal Regulations, USA.
NIOSH Manual of Analytical Methods, Method 5040: Diesel Particulate Matter (as Elemental Carbon). — National Institute for Occupational Safety and Health, USA.
Cauda E. G., Bugarski A. D., Patts L. Diesel aftertreatment control technologies in underground mines: the NO₂ issue // 13th United States/North American Mine Ventilation Symposium, 2010 / eds. Hardcastle S., McKinnon D. L. — Sudbury: MIRARCO, 2010. — P. 17–23.
Bugarski A. D., Barone T. L. Diesel and welding aerosols in an underground mine // International Journal of Mining Science and Technology. — 2020. — Vol. 30, No. 4. — pp. 449–454. — DOI: 10.1016/j.ijmst.2020.05.002
Ajayi K. M., Gangrade V., Harris M. L., Briton J., Fritz J., Young M., Cole G. Development of Air Quantity Estimator (AQE 2.0) software for estimating airflow requirements for diluting diesel particulate matter // SME Annual Conference, Denver, CO, February 26–March 1, 2023. — Preprint 23-041.
Robertson S. B., Grau R. H., Dolgos J., Mucho T. P. A computer software program that estimates air quantity requirements in large-opening stone mines // Mine Ventilation: Proceedings of the 10th U.S./North American Mine Ventilation Symposium, Anchorage, Alaska, May 16–19, 2004 / eds. Ganguli R., Bandopadhyay S. — Leiden: Balkema, 2004. — pp. 363–369. — ISBN 90-5809-633-5.
CSA M424.2:22. Diesel-Powered Machines for Use in Non-Gassy Underground Mines. — CSA Group.
Minimum Air Quantities for Diesel Engines in Underground Coal Mines: Safety Bulletin SB17-07 / NSW Department of Planning and Environment, Resources Regulator. — November 2017.
Worker Exposure to Diesel Exhaust Emissions — NSW Underground Mines: Targeted Assessment Program Report / NSW Department of Planning and Environment, Resources Regulator. — April 2017.
Kenzy G. W., Ramani R. V. An international review of regulations for diesel-powered equipment in underground mines // Proceedings of the 2nd International Mine Ventilation Congress, Reno, Nevada, USA / ed. P. Mousset-Jones. — 1980. — pp. 175–190.
Watson B., Hanulik M. Ontario Regulation 854 review and guidance: workshop materials. — MDEC Conference, 2023. — URL: https://mdec.ca/2023/WP1_Watson_Hanulik_Workshop_Reg_854.pdf
