Environmental impact of coal mine methane emissions and responding strategies in China

Wang, Chenghao; Wang, Lei; Zhang, Xiaolei

doi:10.1016/j.ijggc.2010.07.007

Cited by 252 publications

(144 citation statements)

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“…First, it was reported that CH 4 emissions in China and other Asian counties have larger uncertainties compared to CO and CO 2 emissions (Olivier et al, 2001;Kurokawa et al, 2013). Recent Chinese studies have suggested that the CH 4 emissions in China reported by previous studies were overestimated by a factor of ∼ 2 (Zhang and Chen, 2010;Cheng et al, 2011;Chen et al, 2013;Kurokawa et al, 2013). This may also be the case for South Asia, the Indochinese Peninsula, and Central Asia.…”

Section: Estimates Of Gem Emissionsmentioning

confidence: 99%

Correlation slopes of GEM / CO, GEM / CO2, and GEM / CH4 and estimated mercury emissions in China, South Asia, the Indochinese Peninsula, and Central Asia derived from observations in northwestern and southwestern China

Zhang

Lin

et al. 2015

Atmos. Chem. Phys.

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Abstract. Correlation analyses between atmospheric mercury (Hg) and other trace gases are useful for identification of sources and constraining regional Hg emissions. Emissions of Hg in Asia contribute significantly to the global budget of atmospheric Hg. However, due to the lack of reliable data on the source strength, large uncertainties remain in the emission inventories of Hg in Asia. In the present study, we calculated the correlation slopes of GEM / CO, GEM / CO 2 , and GEM / CH 4 for mainland China, South Asia, the Indochinese Peninsula, and Central Asia using the ground-based observations at three remote sites in northwestern and southwestern China, and applied these values to estimate GEM emissions in the four source regions. The geometric mean GEM / CO correlation slopes for mainland China, South Asia, the Indochinese Peninsula, and Central Asia were 7.3 ± 4.3, 7.8 ± 6.4, 7.8 ± 5.0, and 13.4 ± 9.5 pg m −3 ppb −1 , respectively, and values in the same source regions were 33.3 ± 30.4, 27.4 ± 31.0, 23.5 ± 15.3, and 20.5 ± 10.0 pg m −3 ppb −1 for the GEM / CH 4 correlation slopes, respectively. The geometric means of GEM / CO 2 correlation slopes for mainland China, South Asia, and Central Asia were 240 ± 119, 278 ± 164, 315 ± 289 pg m −3 ppm −1 , respectively. These values were the first reported correlation slopes of GEM / CO, GEM / CO 2 , and GEM / CH 4 in four important source regions of Asia, not including the GEM / CO ratios in mainland China. The correlation slopes of GEM / CO, GEM / CO 2 , and GEM / CH 4 in Asia were relatively higher than those observed in Europe, North America, and South Africa, which may highlight GEM emissions from nonferrous smelting, large-scale and artisanal mercury and gold production, natural sources, and historically deposited mercury (re-emission) in Asia. Using the observed GEM / CO and GEM / CO 2 slopes, and the recently reported emission inventories of CO and CO 2 , the annual GEM emissions in mainland China, South Asia, the Indochinese Peninsula, and Central Asia were estimated to be in the ranges of 1071-1187, 340-470, 125, and 54-90 t, respectively. The estimated quantity of GEM emissions from the GEM / CH 4 correlation slopes is significantly larger, which may be due to the larger uncertainties in CH 4 emissions in Asia as well as insufficient observations of GEM / CH 4 correlation slopes, therefore leading to an overestimate of GEM emissions. Our estimates of GEM emissions in the four Asian regions were significantly higher (3-4 times) than the anthropogenic GEM emissions reported in recent studies. This discrepancy could come from a combination of reasons including underestimates of anthropogenic and natural GEM emissions; large uncertainties related to CO, CO 2 , and CH 4 emission inventories; and inherent limitations of the correlation slope method.

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Section: Estimates Of Gem Emissionsmentioning

confidence: 99%

Correlation slopes of GEM / CO, GEM / CO2, and GEM / CH4 and estimated mercury emissions in China, South Asia, the Indochinese Peninsula, and Central Asia derived from observations in northwestern and southwestern China

Zhang

Lin

et al. 2015

Atmos. Chem. Phys.

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“…Due to the high share of CMM emissions, we performed a sensitivity analysis of the specific CMM factor. We introduced a utilisation rate of CMM, assuming that currently discussed utilisation measures for methane [84,85] may increasingly be applied in the future, and varied the rate from 10 to 50% (sensitivity cases CM1 to CM5). The analogous reduction of the CMM factor (0.0169 kg CH 4 /kg coal) by 10 to 50% results in a 1.5 to 7.5% reduction in the total GHG emissions of the power plant.…”

Section: Environmental Impacts Of Ccs-based Power Plants From a Life mentioning

confidence: 99%

Prospects of carbon capture and storage (CCS) in China’s power sector – An integrated assessment

2015

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Objective The aim of the present article is to conduct an integrated assessment in order to explore whether CCS could be a viable technological option for significantly reducing future CO 2 emissions in China.Methods In this paper, an integrated approach covering five assessment dimensions is chosen.Each dimension is investigated using specific methods (graphical abstract). ResultsThe most crucial precondition that must be met is a reliable storage capacity assessment based on site-specific geological data. Our projection of different trends of coal-based power plant capacities up to 2050 ranges between 34 and 221 Gt of CO 2 that may be captured from coal-fired power plants to be built by 2050. If very optimistic assumptions about the country's CO 2 storage potential are applied, 192 Gt of CO 2 could theoretically be stored as a result of matching these sources with suitable sinks. If a cautious approach is taken, this figure falls to 29 Gt of CO 2 . In practice, this potential will decrease further with the impact of technical, legal, economic and social acceptance factors. Further constraints may be the delayed commercial availability of CCS in China; a significant barrier to achieving the economic viability of CCS due to a currently non-existing nation-wide CO 2 pricing scheme that generates a sufficiently strong price signal; an expected life-cycle reduction rate of the power plant's greenhouse gas emissions of 59 to 60%; and an increase in most other negative environmental and social impacts. Conclusion and practice implicationsMost experts expect a striking dominance of coal-fired power generation in the country's electricity sector, even if the recent trend towards a flattened deployment of coal capacity and reduced annual growth rates of coal-fired generation proves to be true in the future. In order to reduce fossil fuel-related CO 2 emissions to a level that would be consistent with the long-term climate protection target of the international community to

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“…China is the world's leading emitter of coalmine methane; it accounts for 45% of world's VAM emissions [5], with a VAM concentration lower than 0.25% [6]. The low concentration of VAM is considered as a major challenge for its utilization and mitigation.…”

Section: Introductionmentioning

confidence: 99%

Vacuum Exhaust Process in Pilot-Scale Vacuum Pressure Swing Adsorption for Coal Mine Ventilation Air Methane Enrichment

Yang

Liu

et al. 2018

Energies

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Recovery and treatment of methane from coal mine ventilation air methane (VAM) with cost-effective technologies have been an ongoing challenge due to low methane concentrations. In this study, a type of coconut shell-based active carbon was employed to enrich VAM with a three-bed vacuum pressure swing adsorption unit. A new vacuum exhaust step for the VPSA process was introduced. The results show that the vacuum exhaust step can increase the methane concentration of the product without changing adsorption and desorption pressure. Under laboratory conditions, the concentration of product increased from 0.4% to 0.69% as the vacuum exhaust ratio increased from 0 to 3.1 when the feed gas concentration was 0.2%. A 500 m 3 /h pilot-scale test system for VAM enrichment was built rendering good correlation with the laboratory results in terms of the vacuum exhaust step. By using a two-stage three-bed separation unit, the VAM was enriched from 0.2% to over 1.2%.

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Environmental impact of coal mine methane emissions and responding strategies in China

Cited by 252 publications

References 13 publications

Correlation slopes of GEM / CO, GEM / CO<sub>2</sub>, and GEM / CH<sub>4</sub> and estimated mercury emissions in China, South Asia, the Indochinese Peninsula, and Central Asia derived from observations in northwestern and southwestern China

Correlation slopes of GEM / CO, GEM / CO<sub>2</sub>, and GEM / CH<sub>4</sub> and estimated mercury emissions in China, South Asia, the Indochinese Peninsula, and Central Asia derived from observations in northwestern and southwestern China

Prospects of carbon capture and storage (CCS) in China’s power sector – An integrated assessment

Vacuum Exhaust Process in Pilot-Scale Vacuum Pressure Swing Adsorption for Coal Mine Ventilation Air Methane Enrichment

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Environmental impact of coal mine methane emissions and responding strategies in China

Cited by 252 publications

References 13 publications

Correlation slopes of GEM / CO, GEM / CO&lt;sub&gt;2&lt;/sub&gt;, and GEM / CH&lt;sub&gt;4&lt;/sub&gt; and estimated mercury emissions in China, South Asia, the Indochinese Peninsula, and Central Asia derived from observations in northwestern and southwestern China

Correlation slopes of GEM / CO, GEM / CO&lt;sub&gt;2&lt;/sub&gt;, and GEM / CH&lt;sub&gt;4&lt;/sub&gt; and estimated mercury emissions in China, South Asia, the Indochinese Peninsula, and Central Asia derived from observations in northwestern and southwestern China

Prospects of carbon capture and storage (CCS) in China’s power sector – An integrated assessment

Vacuum Exhaust Process in Pilot-Scale Vacuum Pressure Swing Adsorption for Coal Mine Ventilation Air Methane Enrichment

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Product

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Correlation slopes of GEM / CO, GEM / CO<sub>2</sub>, and GEM / CH<sub>4</sub> and estimated mercury emissions in China, South Asia, the Indochinese Peninsula, and Central Asia derived from observations in northwestern and southwestern China

Correlation slopes of GEM / CO, GEM / CO<sub>2</sub>, and GEM / CH<sub>4</sub> and estimated mercury emissions in China, South Asia, the Indochinese Peninsula, and Central Asia derived from observations in northwestern and southwestern China