A common reclamation practice for closed coal surface mines is filling them with water to form pit lakes.The creation and sustainability of these lakes are significantly affected by the stability of the corresponding ...A common reclamation practice for closed coal surface mines is filling them with water to form pit lakes.The creation and sustainability of these lakes are significantly affected by the stability of the corresponding slopes.The present study provides a general framework for analyzing the water filling’s effect on slope stability based on a new water filling index,which can indirectly consider the factors affecting the process and efficiently quantify the filling speed’s influence.The assumptions of the proposed approach are thoroughly discussed,and the range of the water filling index is identified.Furthermore,the safety factor is calculated using the finite element method with the shear strength reduction technique during the filling process for various conditions(soil properties,slope geometry,hydraulic conditions,and water filling speed).Results are presented as normalized stability charts for practical use.During the water filling,the stability gradually decreases until the reservoir reaches a critical level of 10%e40%of the total height;it then increases to even more stable conditions than the initial one.Overall,the present analysis allows for the preliminary stability evaluation of a coal mine during the formation of a pit lake and the appropriate quantification of the water filling’s effect.展开更多
利用商业软件Aspen Plus 11.1,对一带有燃烧后CO2捕集的600,MW燃煤发电系统进行了详细的热力性能仿真,并基于该仿真结果对该系统开展了详细的分析计算.分析结果表明,燃烧后CO2捕集发电系统的效率为35.59%,较之传统燃煤发电系统,...利用商业软件Aspen Plus 11.1,对一带有燃烧后CO2捕集的600,MW燃煤发电系统进行了详细的热力性能仿真,并基于该仿真结果对该系统开展了详细的分析计算.分析结果表明,燃烧后CO2捕集发电系统的效率为35.59%,较之传统燃煤发电系统,效率下降了8.12%.其中锅炉设备的损失比例为42.49%,是燃烧后捕集系统中损失最大的部分.单乙醇胺(MEA)捕集系统的损失比例为8.64%,具有较大的节能潜力;CO2压缩系统的损失比较小,但有较大的热能浪费,可以用于加热给水以减少系统损失.展开更多
基金This work has received funding from the European Union’s Research Fund for Coal and Steel under the projects RAFF grant agreement No.847299 and POMHAZ grant agreement No.101057326.Financial assistance by the European Commission is much appreciated.
文摘A common reclamation practice for closed coal surface mines is filling them with water to form pit lakes.The creation and sustainability of these lakes are significantly affected by the stability of the corresponding slopes.The present study provides a general framework for analyzing the water filling’s effect on slope stability based on a new water filling index,which can indirectly consider the factors affecting the process and efficiently quantify the filling speed’s influence.The assumptions of the proposed approach are thoroughly discussed,and the range of the water filling index is identified.Furthermore,the safety factor is calculated using the finite element method with the shear strength reduction technique during the filling process for various conditions(soil properties,slope geometry,hydraulic conditions,and water filling speed).Results are presented as normalized stability charts for practical use.During the water filling,the stability gradually decreases until the reservoir reaches a critical level of 10%e40%of the total height;it then increases to even more stable conditions than the initial one.Overall,the present analysis allows for the preliminary stability evaluation of a coal mine during the formation of a pit lake and the appropriate quantification of the water filling’s effect.
文摘利用商业软件Aspen Plus 11.1,对一带有燃烧后CO2捕集的600,MW燃煤发电系统进行了详细的热力性能仿真,并基于该仿真结果对该系统开展了详细的分析计算.分析结果表明,燃烧后CO2捕集发电系统的效率为35.59%,较之传统燃煤发电系统,效率下降了8.12%.其中锅炉设备的损失比例为42.49%,是燃烧后捕集系统中损失最大的部分.单乙醇胺(MEA)捕集系统的损失比例为8.64%,具有较大的节能潜力;CO2压缩系统的损失比较小,但有较大的热能浪费,可以用于加热给水以减少系统损失.
