Understanding CO2 Gas Production Above a Partly Flooded, Former Coal Mining Area

Lagny, Candice; Lafortune, Stéphane; Charmoille, Arnaud; Pokryszka, Zbigniew; Degrelle, François; Kimmel, Marion

doi:10.1016/j.proeps.2013.03.095

Cited by 5 publications

(4 citation statements)

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“…Example of a negative obtained with the SEM (Lagny et al, 2013) Marcasite (or white iron pyrite) was found on several samples both in a pristine and a partially oxidised state. It is a ferrous sulphide mineral which is more easily oxidised than pyrite.…”

Section: Figmentioning

confidence: 99%

Noxious gas emissions above former coal and iron mines in Lorraine due to the presence of iron sulphides

Lagny

2015

Environ Earth Sci

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International audienceStudies were carried out in the iron and coal basins of Lorraine (North-East of France) which indicated that oxygen-depleted air and carbon dioxide was being emitted into built-up areas related to former mine workings. Investigations were carried out to determine the origin of this gas production indicated that carbon dioxide production could be caused by the oxidation of iron sulphide minerals (pyrite and marcasite) and reaction of sulphuric acid with carbonates minerals to produce carbon dioxide gas. These reactions have produced highly mineralised mine water with circum-neutral pH values and a low content of dissolved metals and metalloids. Through a bibliographic study, similar neutral mine drainage has been observed and assumptions were made on the reactions which could take place. A conceptual model is proposed to explain the gas emissions

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Section: Figmentioning

confidence: 99%

Noxious gas emissions above former coal and iron mines in Lorraine due to the presence of iron sulphides

Lagny

2015

Environ Earth Sci

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“…Lack of charging in the shaft is an unfavorable situation in terms of the emission of mine gases into the atmosphere as well as in terms of safety in the vicinity of the shaft. In the GZW area, gases can flow through them hydraulically [21].…”

Section: Introductionmentioning

confidence: 99%

Variability of CO2, CH4, and O2 Concentration in the Vicinity of a Closed Mining Shaft in the Light of Extreme Weather Events—Numerical Simulations

Wrona,

Różański,

Pach

et al. 2023

Energies

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With climate change, more intense weather phenomena can be expected, including pressure drops related to the arrival of an atmospheric front. Such drops of pressure are the main reason for gas emissions from closed mines to the surface, and a closed, empty mine shaft is the most likely route of this emission. Among the gases emitted, the most important are carbon dioxide and methane, creating a twofold problem—greenhouse gas emissions and gas hazards. The work presented in this paper simulated the spread of the mentioned gases near such an abandoned shaft for four variants: model validation, the most dangerous situations found during measurements with or without wind, and a forecast variant for a possible future pressure drop. It was found that a momentary CO2 emission of 0.69 m3/s and a momentary CH4 emission of 0.29 m3/s are possible, which for one hour of the appropriate drop would give hypothetically 2484 m3 CO2 and 1044 m3 CH4. In terms of gas hazards, the area that should be monitored and protected may exceed 25 m from a closed shaft in the absence of wind influence. The wind spreads the emitted gases to distances exceeding 50 m but dilutes them significantly.

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“…In terms of environmental protection and gas hazards at the surface, two gases are the most important: carbon dioxide (CO 2 ) and methane (CH 4 ) (Bateson et al, 2008;Cheng et al, 2011;Beaubien et al, 2013;Lagny et al, 2013;Feitz et al, 2014;Jones et al, 2014). They are both considered to be greenhouse gases.…”

Section: Introductionmentioning

confidence: 99%

Archives of Mining Sciences

Wrona¹,

Król²,

Król³

2018

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Gas emissions from underground sites to the atmosphere depend on many factors. Pressure drops are considered to be the most important. However, emissions can also be observed during the initial phase of the pressure rise, following a previous drop in pressure. On the other hand, gas emissions may not be detected when the pressure drops, especially when a previous pressure rise has taken place.The aim of the research was to determine the role of variations in baric tendency on airflow rate and its direction.To solve this problem a numerical model was built utilizing the Ansys Fluent software package. Subsequently, three scenarios of baric tendency variations were tested: a) rise -drop, b) drop -drop, c) drop -rise.The results showed inert behavior of gases. Under scenario (c), 1 hour after the change in tendency gases still were flowing out to the atmosphere.Considering scenario (a), it was proved that even during a pressure drop gas emissions do not take place, which can be crucial for further determination of the gas hazard at the surface or for assessment of the rate of gas emissions from a particular gas emitter.Scenario (b) merely gave an overview of the process and was mainly used for validation purposes. It gave a maximal CO 2 concentration of 2.18%vol (comparable to measurements) and a CO 2 mass flow rate 0.15kg/s. Taking into account greenhouse gas emissions this amounted to 514 kg CO 2 /h.

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Understanding CO2 Gas Production Above a Partly Flooded, Former Coal Mining Area

Cited by 5 publications

References 1 publication

Noxious gas emissions above former coal and iron mines in Lorraine due to the presence of iron sulphides

Noxious gas emissions above former coal and iron mines in Lorraine due to the presence of iron sulphides

Variability of CO2, CH4, and O2 Concentration in the Vicinity of a Closed Mining Shaft in the Light of Extreme Weather Events—Numerical Simulations

Archives of Mining Sciences

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