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宁夏特殊用煤的煤岩煤质煤类特征控制因素与成因类型

Controlling factors of coal petrology, coal quality, and coal type characteristics and classification of genesis types of special coal in Ningxia

  • 摘要: 推进煤炭资源从燃料向燃料与原料并重转变,实现煤炭清洁高效利用是21世纪解决能源、资源和环境问题的重要途径,煤炭质量评价是煤炭清洁高效利用的基础性工作,赋存规律及控制因素研究为煤炭质量评价提供科学依据。以煤岩、煤质、煤类的成因为切入点,分析了宁夏特殊用煤形成和演变及其控制因素,查明了宁夏特殊用煤分布特征,划分了宁夏特殊用煤的成因类型。结果表明:宁夏太原组、山西组、延安组的沉积环境分别以障壁海岸、湖泊三角洲、冲积平原为主;太原组和山西组泥炭沼泽类型以潮湿森林沼泽和潮湿草本沼泽为主,延安组泥炭沼泽类型以干燥森林沼泽为主;受沉积环境和泥炭沼泽类型共同影响,3套煤层的煤岩、煤质特征存在差异。宁夏煤均受深成变质作用影响,大部分变质程度较低,香山煤田太原组和宁东煤田韦州矿区西部煤叠加了动力变质作用,贺兰山煤田煤叠加了区域岩浆热变质作用,变质程度较高。根据特殊用煤对煤岩、煤质及煤类的要求,分析了宁夏特殊用煤的时空分布特征,优质无烟煤分布在汝箕沟矿区;炼焦用煤主要分布在横城矿区、韦州矿区东部、四股泉矿区、沙巴台矿区、石炭井矿区和石嘴山矿区;液化用煤主要分布在红墩子矿区、鸳鸯湖矿区和灵武矿区;除上述区域外的煤均可作气化用煤。从沉积环境、泥炭沼泽类型和变质作用类型入手,建立了宁夏特殊用煤成因类型划分方案,将宁夏特殊用煤成因类型划分为16种,其中太原组8种、山西组5种、延安组4种(其中太原组和山西组均包含“湖泊三角洲−潮湿森林沼泽−深成变质作用型”这一成因类型)。该成果可为宁夏煤炭清洁高效利用提供理论支撑。

     

    Abstract: Promoting the transition of coal resources from fuel to both fuel and raw material, and achieving clean and efficient utilization of coal are crucial approaches to addressing energy, resource, and environmental challenges in the 21st century. Coal quality assessment serves as the foundational work for clean and efficient coal utilization, while studies on occurrence patterns and controlling factors provide scientific support for coal quality evaluation. Taking the genesis of coal petrology and coal types as the starting point, the formation, evolution, and controlling factors of special coal in Ningxia were analyzed. The distribution characteristics of special coal were found out, and the genetic types of special coal in Ningxia were classified. The results show that the sedimentary environments of the Taiyuan Formation, Shanxi Formation, and Yan’an Formation in Ningxia are mainly barrier coast, lake delta, and alluvial plain, respectively. The peat swamp types of the Taiyuan Formation and Shanxi Formation were dominated by humid forest swamps and humid herbaceous swamps, while those of the Yan’an Formation were mainly dry forest swamps. Influenced by both the sedimentary environments and the peat swamp types, the coal petrology and coal quality characteristics of the three sets of coal seams differ. During metamorphism, the coal was affected by deep metamorphism in Ningxia, and most of them have a low degree of metamorphism. The coal of the Taiyuan Formation in the Xiangshan coalfield and the coal in the western Weizhou mining area of the Ningdong coalfield underwent dynamic metamorphism superimposed on deep metamorphism, and the coal in the Helanshan coalfield experienced regional magmatic thermal metamorphism superimposed on deep metamorphism, and the coal have a higher degree of metamorphism. The spatiotemporal distribution characteristics of special coal in Ningxia were analyzed according to the requirements for coal petrology, coal quality and coal type of special coal. High-quality anthracite is distributed in the Rujigou mining area. Coking coal is mainly located in the Hengcheng mining area, the eastern part of Weizhou mining area, the Siguquan mining area, the Shabatai mining area, the Shitanjing mining area and the Shizuishan mining area. Liquefaction coal is mainly distributed in the Hongdunzi mining area, the Yuanyanghu mining area and the Lingwu mining area. Except for the above-mentioned areas, coal can be used as coal for gasification. The classification scheme for the genetic types of special coal in Ningxia was established based on sedimentary environments, peat swamp types, and metamorphic types. The special coal genetic types were divided into 16 categories, including 8 for the Taiyuan Formation, 5 for the Shanxi Formation, and 4 for the Yan’an Formation(The Taiyuan Formation and Shanxi Formation both contain the genetic type of “lake delta humid forest swamp deep metamorphic process”). The results provide theoretical support for the clean and efficient utilization of coal in Ningxia.

     

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