Greenhouse gas emissions from low-temperature oxidation and spontaneous combustion at open-cut coal mines in Australia

Carras, John; Day, Stuart; Saghafi, A.; Williams, David J.

doi:10.1016/j.coal.2008.12.001

Cited by 180 publications

(94 citation statements)

References 9 publications

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“…Accordingly, research into developing a tractable methodology for estimating emissions has been conducted in Australia over the past decade. Carras et al (2009), for instance, recently reported results of a study conducted at 11 Australian open-cut coal mines where emissions of CO 2 and CH 4 from low-temperature oxidation and spontaneous combustion in spoil and other waste were measured using flux chambers. In that study, emissions were categorised according to the intensity of spontaneous combustion, and despite considerable scatter in the data, three broad categories of spontaneous combustion were identified.…”

Section: Introductionmentioning

confidence: 99%

Greenhouse gas emissions from Australian open-cut coal mines: contribution from spontaneous combustion and low-temperature oxidation

Day

Carras

Fry

et al. 2009

Environ Monit Assess

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Spontaneous combustion and low-temperature oxidation of waste coal and other carbonaceous material at open-cut coal mines are potentially significant sources of greenhouse gas emissions. However, the magnitude of these emissions is largely unknown. In this study, emissions from spontaneous combustion and low-temperature oxidation were estimated for six Australian open-cut coal mines with annual coal production ranging from 1.7 to more than 16 Mt. Greenhouse emissions from all other sources at these mines were also estimated and compared to those from spontaneous combustion and low-temperature oxidation. In all cases, fugitive emission of methane was the largest source of greenhouse gas; however, in some mines, spontaneous combustion accounted for almost a third of all emissions. For one mine, it was estimated that emissions from spontaneous combustion were around 250,000 t CO(2)-e per annum. The contribution from low-temperature oxidation was generally less than about 1% of the total for all six mines. Estimating areas of spoil affected by spontaneous combustion by ground-based surveys was prone to under-report the area. Airborne infrared imaging appears to be a more reliable method.

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Section: Introductionmentioning

confidence: 99%

Greenhouse gas emissions from Australian open-cut coal mines: contribution from spontaneous combustion and low-temperature oxidation

Day

Carras

Fry

et al. 2009

Environ Monit Assess

Self Cite

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“…Through this strategy, [55] reviewed some technical measures to avoid and reduce carbon emissions in the operation of the mine, especially comminution, include high pressure grinding roll, vertical roller mills and microwave heating technology.…”

Section: Improve the Energy Efficiency Of Mining Equipmentmentioning

confidence: 99%

“…The results of the current analysis are consistent with previous research. For instance, several studies including Yahaya [53], Kittipongvises [54], Carras [55], Sterling [56] as well as in that one of Silva [57] reported that over half of all electricity consumed in the mining operation was mainly used for crushing and grinding processes. A study by [57] also indicated that energy consumption was the main environmental impact associated to the phosphate rock mining.…”

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confidence: 99%

Assessment of Environmental Impacts of Limestone Quarrying Operations in Thailand

Kittipongvises

2017

Environmental and Climate Technologies

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-Environmental impacts of the mineral extraction have been a public concern. Presently, there is widespread global interest in the area of mining and its sustainability that focused on the need to shift mining industry to a more sustainable framework. The aim of this study was to systematically assess all possible environmental and climate change related impacts of the limestone quarrying operation in Thailand. By considering the life cycle assessment method, the production processes were divided into three phases: raw material extraction, transportation, and comminution. Both IMPACT 2002+ and the Greenhouse Gas Protocol methods were used. Results of IMPACT 2002+ analysis showed that per 1 ton crushed limestone rock production, the total depletion of resource and GHGs emissions were 79.6 MJ and 2.76 kg CO2 eq., respectively. Regarding to the four damage categories, 'resources' and 'climate change' categories were the two greatest environmental impacts of the limestone rock production. Diesel fuel and electricity consumption in the mining processes were the main causes of those impacts. For climate change, the unit of CO2 eq. was expressed to quantify the total GHGs emissions. Estimated result was about 3.13 kg CO2 eq. per ton limestone rock product. The results obtained by the Greenhouse Gas Protocol were also similar to IMPACT 2002+ method. Electrical energy consumption was considered as the main driver of GHGs, accounting for approximately 46.8 % of total fossil fuel CO2 emissions. A final point should be noted that data uncertainties in environmental assessment over the complete life cycle of limestone quarrying operation have to be carefully considered.

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“…During coal combustion, large amounts of greenhouse gases, e.g. CO 2 and CH4, are emitted, together with toxic gases like SO 2 and NOx [1,3,4]. The combustion of coal may also result in surface subsidence [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental research on temperature variation and crack development in coalfield fire

Fei¹,

wen²

2017

IJHT

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With the destruction of numerous coal seams around the world, coalfield fire is becoming a matter of global concern. This paper probes into the crack features of rock strata in a coalfield fire-stricken area, to answer to call for energy conservation and environmental protection. Specifically, the temperature variation was investigated through simulation experiments based on the coal seam model and rock strata model, and the crack development was qualitatively researched on the surface of coal seam and the overlying strata. The main conclusions are as follows. Comparing the temperature of measuring points on the same horizontal plane, it is concluded that the temperature of the coal seam above the heat source increased with the distance from the heat source within a certain range. The temperature diffusion was rather slow in coal and rock and the fire source movement was very time-consuming. The surface temperature variation of the overlying strata was similar to that of the fire source, indicating that the fire source could be roughly located by the surface temperature variation of the overlying strata. Meanwhile, the thermal destruction resulted from high temperature boosted the crack development in both coal seam and rock strata, and collapse occurred when the coal burned out. During the coalfield fire, the crack development was bolstered by the high temperature produced in the interaction between the crack field and the temperature field; besides, the cracks created a passage for oxygen supply, which favours the coal combustion. All in all, the coalfield fire development was enhanced by the interaction between the crack field and the temperature field.

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Greenhouse gas emissions from low-temperature oxidation and spontaneous combustion at open-cut coal mines in Australia

Cited by 180 publications

References 9 publications

Greenhouse gas emissions from Australian open-cut coal mines: contribution from spontaneous combustion and low-temperature oxidation

Greenhouse gas emissions from Australian open-cut coal mines: contribution from spontaneous combustion and low-temperature oxidation

Assessment of Environmental Impacts of Limestone Quarrying Operations in Thailand

Experimental research on temperature variation and crack development in coalfield fire

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