基于绿色生态开采的我国西部生态脆弱矿区“煤-水-热”共采范式
刘晓秀 , 曾一凡 , 武强 , 孟世豪 , 梁季月 , 侯柱平
工程(英文) ›› 2024, Vol. 38 ›› Issue (7) : 235 -248.
基于绿色生态开采的我国西部生态脆弱矿区“煤-水-热”共采范式
Ecological-Based Mining: A Coal-Water-Thermal Collaborative Paradigm in Ecologically Fragile Areas in Western China
规模化煤炭开采造成的地下水流失加剧了中国西部生态脆弱煤炭基地水资源短缺窘境。在国家“碳达峰、碳中和”战略目标下,围绕水资源保护与利用进行绿色开采、清洁生产是西部煤炭产业优化的必要途径。本文基于矿井水/热害的资源特征,提出了一种适用于开采过程中持续进行的集约化“煤-水-热”协同共采模式。联合顶板水害防控、水热提质和深部回灌地质封存技术,实现采后伴生资源产、供、储一体化体系。针对矿山原生地质特征与充水动态过程,提出了以调整开采工艺为核心的主动防治体系和以多目标排水、注浆治理为核心的被动防治体系。针对陕西榆林矿区“天窗型”突水模式采取多目标超前疏放被动防控技术后,钻孔涌水量大幅减少50%,有效保障后续安全采煤。结合余热利用的清洁生产理念,建立矿区综合能源互补模型,分析了利用矿井水热和风热是小纪汗矿可选的供热方式,为矿区建筑供暖节约标准煤8419 t,节能率达到50.2%,降低矿区供热碳排放24.2%,具有节能环保特点。提出同质异位超深回灌技术流程,模拟评价了长期储水地质环境安全,以单井100 m3∙h-1长期注水不会造成地层破裂和回注水泄露,每年可有效封存处理78.7万吨矿井水于刘家沟组地层。该模式为鄂尔多斯矿区矿井水管理提供了一种可行的方法,为煤炭企业绿色开采和低碳生产提供参考。
A substantial reduction in groundwater level, exacerbated by coal mining activities, is intensifying water scarcity in western China’s ecologically fragile coal mining areas. China’s national strategic goal of achieving a carbon peak and carbon neutrality has made eco-friendly mining that prioritizes the protection and efficient use of water resources essential. Based on the resource characteristics of mine water and heat hazards, an intensive coal-water-thermal collaborative co-mining paradigm for the duration of the mining process is proposed. An integrated system for the production, supply, and storage of mining companion resources is achieved through technologies such as roof water inrush prevention and control, hydrothermal quality improvement, and deep-injection geological storage. An active preventive and control system achieved by adjusting the mining technology and a passive system centered on multi-objective drainage and grouting treatment are suggested, in accordance with the original geological characteristics and dynamic process of water inrush. By implementing advanced multi-objective drainage, specifically designed to address the “skylight-type” water inrush mode in the Yulin mining area of Shaanxi Province, a substantial reduction of 50% in water drillings and inflow was achieved, leading to stabilized water conditions that effectively ensure subsequent safe coal mining. An integrated-energy complementary model that incorporates the clean production concept of heat utilization is also proposed. The findings indicate a potential saving of 8419 t of standard coal by using water and air heat as an alternative heating source for the Xiaojihan coalmine, resulting in an impressive energy conservation of 50.2% and a notable 24.2% reduction in carbon emissions. The ultra-deep sustained water injection of 100 m3·h−1 in a single well would not rupture the formation or cause water leakage, and 7.87 × 105 t of mine water could be effectively stored in the Liujiagou Formation, presenting a viable method for mine-water management in the Ordos Basin and providing insights for green and low-carbon mining.
双碳目标 / 煤-水-热共采 / 生态脆弱矿区 / 矿井水防控 / 水资源利用
Dual carbon targets / Coal-water-thermal co-mining / Ecologically fragile areas / Mine-water control / Resource utilization
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