Assessment of H2S emission hazards into tunnels: the Nosoud tunnel case study from Iran

Morsali, Massoud; Rezaei, Mohsen

doi:10.1007/s12665-017-6493-0

Cited by 18 publications

(5 citation statements)

References 19 publications

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“…Figure 14 schematically shows the absorbent spraying device installed on the position near the downwind side under the support tail beam and its principle of treating outward diffused and residual hydrogen sulphide gas. Using the extrusive absorbent spray to intercept and clean up residual hydrogen sulphide gas in the support rear can effectively reduce outflow hydrogen sulphide in the coal caving process, thereby minimizing the concentration of hydrogen sulphide diffused with wind to the upper corner and the return airway [36][37][38][39] . 11 Geofluids the spray absorbent concentration increasing, whereas the hydrogen sulphide reduction efficiency shows a gradually rising trend with the spray absorbent concentration increasing.…”

Section: Process Technology Of Spraying Absorbents To Treatmentioning

confidence: 99%

Prevention and Control of Hydrogen Sulphide Accidents in Mining Extremely Thick Coal Seam: A Case Study in Wudong Coal Mine

Xuchao

Wang

et al. 2021

Geofluids

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Hydrogen sulphide is a toxic gas often present in coal seams and seriously threatens the lives and health of underground workers in coal mines. In this study, we theoretically modelled hydrogen sulphide generation in extremely thick underground coal mines with the +575 level #45 coal seam of Wudong Coal Mine as an example and obtained the on-site hydrogen sulphide emission pattern and spatial distribution features by combining field measurements and computational fluid dynamics simulation. The results showed that hydrogen sulphide mainly exists in the coal porous system in an adsorbed state. Because hydrogen sulphide has a molecular weight greater than the average molecular weight of air molecules, its concentration decreases with the increase of altitude to the bottom plate. When mining the upper stratified coal stratum, it diffuses widely in the working space; while when mining the lower coal stratum, it mainly concentrates at the bottom of the working face. Based on these analyses, on-site treatments were carried out using mixtures with different concentrations of sodium carbonate and sodium bicarbonate. In addition, different combinations of catalysts as well as type A and type B wetting agents were also tested. Eventually, a neutral KXL-I absorbent was developed, and the process of preinjecting absorbent and spraying absorbent was designed. The results showed that the newly developed KXL-I absorbent has high hydrogen sulphide absorption ability and is suitable for use as an absorbent in Wudong Coal Mine; preinjecting and spraying the absorbent can effectively prevent hydrogen sulphide disasters in the +575 level #45 coal seam in Wudong Coal Mine with the optimal final concentration of 0.9% and the absorption rate of 87% at the shearer of 66.6% at the support. Overall, our study provides valuable information for the prevention and control of hydrogen sulphide disasters in coal mines.

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Section: Process Technology Of Spraying Absorbents To Treatmentioning

confidence: 99%

Prevention and Control of Hydrogen Sulphide Accidents in Mining Extremely Thick Coal Seam: A Case Study in Wudong Coal Mine

Xuchao

Wang

et al. 2021

Geofluids

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“…In addition, methane is highly flammable and explodes at concentrations ranging between 5% and 15%. Many disasters induced by methane leakage have been reported [1][2][3][4][5][6][7][8]. A sewage tunnel was built in Shanghai near the Yangtze River, and the release of shallow-buried methane caused a large displacement of the strata, resulting in the fracture of the tunnel [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Eng. 2023, 17 (7): 1011-1020 https://doi.org/10.1007/s11709-023-0956-z RESEARCH ARTICLE ventilation systems of ordinary tunnels, and their methods have reference significance for analyzing gas tunnel ventilation. Camelli et al [19] simulated the airflow in subway tunnels and stations.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analyses of methane leakage in shield tunnel

He,

Zhu,

Wei

et al. 2023

Front. Struct. Civ. Eng.

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Tunnels constructed in gas-bearing strata are affected by the potential leakage of harmful gases, such as methane gas. Based on the basic principles of computational fluid dynamics, a numerical analysis was performed to simulate the ventilation and diffusion of harmful gases in a shield tunnel, and the effect of ventilation airflow speed on the diffusion of harmful gases was evaluated. As the airflow speed increased from 1.8 to 5.4 m/s, the methane emission was diluted, and the methane accumulation was only observed in the area near the methane leakage channels. The influence of increased ventilation airflow velocity was dominant for the ventilation modes with two and four fans. In addition, laboratory tests on methane leakage through segment joints were performed. The results show that the leakage process can be divided into “rapid leakage” and “slight leakage”, depending on the leakage pressure and the state of joint deformation. Based on the numerical and experimental analysis results, a relationship between the safety level and the joint deformation is established, which can be used as guidelines for maintaining utility tunnels.

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“…The similar accident happened in Nosoud tunnel in IRAN, etc. Statistical analyses of the typical methane explosion accidents occurring in various countries were made and information of methane emission should be included in geotechnical baseline report (Hanifi et al 2012;Kang et al 2013;Morsali and Rezaei 2017;Qiao et al 2018aQiao et al , 2018b. According to statistics, more than 100 methane tunnels have been built in China since 2005, and China has gained rich experience in the design, construction and operation management of methane tunnels Zhang et al 2018Zhang et al , 2019aZhang et al , 2019bQiu et al 2018aQiu et al , 2018bQiu et al , 2018c.…”

Section: Introductionmentioning

confidence: 99%

Methane explosion accidents of tunnels in SW China

Fan

et al. 2019

Geomatics, Natural Hazards and Risk

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This Express Letter reports three methane explosion accidents during tunnel construction in Southwest China. In recent years, tunnel construction of China is developing rapidly. The geological conditions of the tunnel passing through are extremely complex, especially, tunnels in coal strata increase rapidly, what's worse, many methane explosions occur during the tunnel construction. The backgrounds, causes and rescue operation of three methane explosion accidents situation are studied. Furthermore, we proposed relevant measures to prevent methane explosions of tunnels. ARTICLE HISTORY

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Assessment of H2S emission hazards into tunnels: the Nosoud tunnel case study from Iran

Cited by 18 publications

References 19 publications

Prevention and Control of Hydrogen Sulphide Accidents in Mining Extremely Thick Coal Seam: A Case Study in Wudong Coal Mine

Prevention and Control of Hydrogen Sulphide Accidents in Mining Extremely Thick Coal Seam: A Case Study in Wudong Coal Mine

Numerical and experimental analyses of methane leakage in shield tunnel

Methane explosion accidents of tunnels in SW China

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