Hydrogen sulfide occurrence states in China's coal seams

Author:

Yang Shengbo123,Wang Haichao123ORCID,Fu Xuehai4,Tian Jijun123,Zhao Fangyu123,Wang Ze123,Sun Pichen123,Cao Yuzhao123

Affiliation:

1. Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of Central Asian Orogenic Belt, Xinjiang University, China

2. School of Geological and Mining Engineering, Xinjiang University, China

3. CBM Engineering Technology Research Center, Xinjiang University, China

4. School of Resources and Earth Science, China University of Mining and Technology, Xuzhou, Jiangsu province, China

Abstract

The occurrence states of hydrogen sulfide in coal seams are crucial in preventing and controlling hydrogen sulfide emission in coal mines and the safe development of coal bed methane. In this study, the research status of the occurrence states of free-state, adsorbed-state, and water-soluble hydrogen sulfide in coal seams was systematically analyzed. H2S anomaly areas in China's coal seams are mainly located in the Carboniferous-Permian and Jurassic series of northern, eastern, central, and northwest regions of China. Bacterial sulfate reduction accounts for most of the hydrogen sulfide anomalies of low-rank coal, while thermochemical decomposition thermal desorption spectroscopy and thermochemical sulfate reduction may also result in hydrogen sulfide anomaly in medium- and high-rank coal. In contrast, magmatism-induced hydrogen sulfide anomalies are rarely found. Absorbed-state hydrogen sulfide anomalies are prevailing, while water-soluble and free-state hydrogen sulfide anomalies are relatively scarce. Coal seam's porosity mainly controls the hydrogen sulfide adsorption, pressure, coalification degree, pore volume, and specific area, while water-soluble hydrogen sulfide is influenced by pressure, sulfate-reducing bacteria, burn, porosity, fractures, water temperature, and hydrodynamic conditions. The fractures in coal seams, their burial depth, coal quality, coal rank, roof, and floor lithology are the main factors controlling the free-state hydrogen sulfide preservation. The absorbed-state hydrogen sulfide in coal seams is mainly mitigated by varying the ventilation mode, increasing the ventilation capacity, spraying alkali fog into the air, and injecting alkali liquid into coal seams for governance.

Funder

Scientific Research Program of the Higher Education Institution of Xinjiang

National Natural Science Foundation of China

Natural Science Foundation of Xinjiang Uygur Autonomous Region

the 2017 PhD research startup foundation of Xinjiang University

Publisher

SAGE Publications

Subject

Energy Engineering and Power Technology,Fuel Technology,Nuclear Energy and Engineering,Renewable Energy, Sustainability and the Environment

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