The Geheyan Power Station on the Qingjiang river has four inlet tunnels, on the right bank, with its excavation diameter of 11.3 m to 12.5 m, after lining diameter of 9.5 m, axis to axis spacing of 24 m. The thickness...The Geheyan Power Station on the Qingjiang river has four inlet tunnels, on the right bank, with its excavation diameter of 11.3 m to 12.5 m, after lining diameter of 9.5 m, axis to axis spacing of 24 m. The thickness of the pillar between tunnels should usually be more than two times of tunnel diameter to ensure the stability of surrounding rock during excavation. In this paper, the excavation methods of tunnels with the pillar thickness as small as the tunnel diameter, such as smooth surface blasting, shotcrete support protection, are emphatically discussed.展开更多
冶金行业是高能耗型行业,其碳减排压力巨大,而氢气既可作为还原剂参与冶金过程,又可作为能源使用,具有巨大的碳减排潜力。以清江隔河岩水电站为例,利用其水电制氢供给当地冶金行业,并采用排放因子法对水电制氢冶金的综合碳减排效应进行...冶金行业是高能耗型行业,其碳减排压力巨大,而氢气既可作为还原剂参与冶金过程,又可作为能源使用,具有巨大的碳减排潜力。以清江隔河岩水电站为例,利用其水电制氢供给当地冶金行业,并采用排放因子法对水电制氢冶金的综合碳减排效应进行评估。结果表明:利用隔河岩水电站水电制氢供给冶金行业的综合碳减排效应为冶金每吨减排0.2462 t CO_(2)eq,纯氢的替代比例是影响碳减排效应的关键因素;使用隔河岩水电制氢冶金会使每吨冶金成本上升338.4元,当电价下降为0.14元/kW·h以下或制氢效率提高至2 kW·h/Nm^(3)后,氢冶金与传统冶金成本一致;充分利用弃水电制氢能够实现最大经济性,实现年额外盈利803.75万元,不考虑制氢盈利的最大制氢冶金碳减排潜力能够达到23790.03 t CO_(2)eq。在当前的双碳背景下,利用水电制氢结合当地用氢场景用氢能够在经济、环境、社会多方面取得积极效应,是在可持续前提下实现“双碳”目标的一种可行思路。展开更多
文摘The Geheyan Power Station on the Qingjiang river has four inlet tunnels, on the right bank, with its excavation diameter of 11.3 m to 12.5 m, after lining diameter of 9.5 m, axis to axis spacing of 24 m. The thickness of the pillar between tunnels should usually be more than two times of tunnel diameter to ensure the stability of surrounding rock during excavation. In this paper, the excavation methods of tunnels with the pillar thickness as small as the tunnel diameter, such as smooth surface blasting, shotcrete support protection, are emphatically discussed.
文摘冶金行业是高能耗型行业,其碳减排压力巨大,而氢气既可作为还原剂参与冶金过程,又可作为能源使用,具有巨大的碳减排潜力。以清江隔河岩水电站为例,利用其水电制氢供给当地冶金行业,并采用排放因子法对水电制氢冶金的综合碳减排效应进行评估。结果表明:利用隔河岩水电站水电制氢供给冶金行业的综合碳减排效应为冶金每吨减排0.2462 t CO_(2)eq,纯氢的替代比例是影响碳减排效应的关键因素;使用隔河岩水电制氢冶金会使每吨冶金成本上升338.4元,当电价下降为0.14元/kW·h以下或制氢效率提高至2 kW·h/Nm^(3)后,氢冶金与传统冶金成本一致;充分利用弃水电制氢能够实现最大经济性,实现年额外盈利803.75万元,不考虑制氢盈利的最大制氢冶金碳减排潜力能够达到23790.03 t CO_(2)eq。在当前的双碳背景下,利用水电制氢结合当地用氢场景用氢能够在经济、环境、社会多方面取得积极效应,是在可持续前提下实现“双碳”目标的一种可行思路。