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) : 209-222.

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工程(英文) ›› 2024, Vol. 38 ›› Issue (7) : 209-222. DOI: 10.1016/j.eng.2024.01.019
研究论文
Research

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

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Ecological-Based Mining: A Coal-Water-Thermal Collaborative Paradigm in Ecologically Fragile Areas in Western China

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摘要

规模化煤炭开采造成的地下水流失加剧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为核心进行绿色开采、清洁生产是西部煤炭产业优化的必要途径。基于矿井水/热害的资源属性,本文提出了一种西部煤炭开发全时域煤水热正效协同模式,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煤炭开采伴生资源集控制、利用、储存于一体,实现资源配置优化。针对矿山原生地质特征与充水动态过程分别提出以调整开采方式控制的主动防治体系,和基于多目标疏放与注浆治理的被动防控体系。工程应用表明,通过在陕西榆林矿区针对“天窗型”突水模式实施多目标超前疏放被动防控技术后,实现了钻孔与疏放水量减半且涌水量稳定效果,从而有效保障后续安全采煤。此外,融入余热利用的清洁生产理念建立了矿区综合能源互补模型,通过利用矿井水热和风热作为小纪汗矿可选替代热源,为矿区建筑供暖节约标准煤8419 t,节能率达到50.2%,并显著降低矿区供热碳排放24.2%。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,刘家沟组每年可有效封存处理78.7万吨矿井水。该模式为鄂尔多斯矿区矿井水管理方式提供了可行方法,为煤炭企业绿色开采和低碳生产提供见解。

Abstract

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.

关键词

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

Keywords

Dual carbon targets / Coal-water-thermal co-mining / Ecologically fragile areas / Mine-water control / Resource utilization

引用本文

导出引用
刘晓秀, 曾一凡, 武强. 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. Engineering. 2024, 38(7): 209-222 https://doi.org/10.1016/j.eng.2024.01.019

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