Thoughts on the development path of coal and gas co-mining technology in dual carbon strategy
LI Shugang;ZHANG Jingfei;LIN Haifei;DING Yang;BAI Yang;ZHOU Yuxuan;ZHU BING;DAI Zheng
西安科技大学 安全科学与工程学院西安科技大学 西部矿井开采及灾害防治教育部重点试验室煤炭行业西部矿井瓦斯智能抽采工程研究中心
自提出“双碳”目标以来,我国生态文明建设已进入以降碳为重点战略方向的关键时期。煤炭作为兜底能源的地位短期内不会改变,能耗“双控”向碳排放总量和强度“双控”转变的核心即为CH4−CO2协同减排。在精准分析碳达峰、碳中和阶段煤矿CH4−CO2双重碳减排面临挑战的基础上,明确了双碳战略中煤气共采技术发展需结合现状需求−技术攻关−政策驱动的核心原则,制定了双碳战略中煤气共采技术的发展路径,论述了其中的关键技术问题。碳达峰阶段,CH4减排以排放源管控为基础视角,核心为瓦斯抽采−利用全周期碳减排关键技术,包含瓦斯富集区靶向精准抽采技术、低渗煤层增透及注气驱替增流抽采技术、关闭矿井瓦斯逃逸通道封堵减碳技术、瓦斯富集−提浓−利用一体化技术,目的是大幅提升高浓度瓦斯抽采−利用效率,减少低浓度及通风瓦斯碳排放;CO2减排以“CCUS+生态碳汇”全域负碳排放技术为核心,包含煤层CO2封存、工业固废采空区充填协同CO2地质封存、煤矿碳封存区域土壤−地表−大气异常监测及生态碳汇技术,进一步吸纳烟道气或纯CO2排放。碳中和阶段核心任务是实现CH4−CO2(近)零碳排放,CO2减排应当由技术攻关示范工程转变为规模化应用阶段,并建立全生命周期煤矿CH4−CO2排放智能监测及动态管控技术体系,实现监测管控技术手段与碳排放环节深度匹配、碳排放监测管控云平台与煤矿全局监控系统深度对接。最后对未来煤气共采体系绿色低碳发展提出了自身见解与思考:①继续深化“高效精准抽采+全浓度梯级利用”煤矿CH4零排放技术模式;②持续攻关“CO2工程封存+生态碳汇”CO2零排放技术体系;③积极探索煤矿“零碳智慧园区”综合解决方案,形成激励和倒逼并重的煤矿碳减排政策支持体系。
The construction of China’s ecological civilization has entered a critical period in which carbon reduction is the key strategic direction since the “dual carbon” goal was proposed. Coal’s status as the least expensive energy source will be unchanged in the short term. CH4-CO2 coordinated emission reduction is the core of the convert from “dual control” of energy consumption to “dual control” of total carbon emissions and intensity. On the basis of accurately analyzing the challenges of CH4-CO2 dual carbon emission reduction in coal mines at the stage of carbon peak and carbon neutrality, the development of coal and gas co-mining technology in the dual carbon strategy has been clarified to be combined with the core principles of current demand-technical research-policy drive, the development path of coal and gas co-mining technology in the dual carbon strategy is formulated, and the key technical issues are discussed. At the peak stage of carbon emission, CH4 emission reduction is based on the perspective of emission source control. The core is the key technology for carbon emission reduction in the whole cycle of gas extraction and utilization, including the targeted and accurate extraction technology in gas-rich areas, the permeability-enhancement, replacement and flow-increasement extraction by injecting gas in low-permeability coal seams, the gas escape channel plugging and carbon reduction technology in closed mines, and the integrated technology of gas enrichment-concentration-utilization. The purpose is to greatly improve the efficiency of high-concentration gas extraction and utilization and to reduce the carbon emission from low-concentration and ventilated gas. CO2 emission reduction is centered on the “CCUS + ecological carbon sink” region-wide negative carbon emission technology to further absorb flue gas and pure CO2 emissions, including CO2 storage in coal seams, industrial solid waste goaf filling synergistic CO2 geological storage, soil-surface-atmosphere anomaly monitoring and ecological carbon sink technology in coal mine carbon storage areas, etc. The core task of the carbon neutralization stage is to achieve CH4-CO2 (near) zero carbon emission. CO2 emission reduction should be transformed from a technical research demonstration project to a large-scale application stage, and establishing an intelligent monitoring and dynamic control technology system for CH4-CO2 emission from coal mine in the whole life cycle to realize the in-deep matching between monitoring and control technology means and carbon emission links, and the in-deep docking between the monitoring-control cloud platform of carbon emission and the global monitoring-control system of coal mines. Finally, the insights and thoughts is put forward on the green and low-carbon development of the future coal and gas co-mining system. ① Continue to deepen the coal mine CH4 zero emission technology model of “efficient and accurate extraction + full-concentration cascade utilization”. ② Continue to tackle the CO2 zero emission technology system of “CO2 engineering storage + ecological carbon sinks”. ③ Actively exploring the comprehensive solution of “zero carbon wisdom park” in coal mines, and forming a policy support system for carbon emission reduction in coal mines that emphasizes both incentive and pushback.
dual carbon goal;CH4−CO2 synergistic emission reduction;gas co-extraction;development path;green and low-carbon technology
主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会