A micro shear testing method which can suit to measure the mechanical properties of heterogeneous materials is introduced, and the properties in each zone of welded joint for CO2 arc welding can be evaluated by using ...A micro shear testing method which can suit to measure the mechanical properties of heterogeneous materials is introduced, and the properties in each zone of welded joint for CO2 arc welding can be evaluated by using this method in this paper. Moreover, these results are compared with those results of Charpy V-notch impact test and their correlation is discussed.展开更多
为有效表征流体在致密储层CO_(2)驱动态裂缝网络系统的分区闭合及动态储容效应,以及反演动态裂缝网络特征参数,建立一种动态裂缝网络水平井试井模型,采用半解析方法、Laplace转换、动态裂缝特征函数、杜哈美原理和Stehfest数值反演求解...为有效表征流体在致密储层CO_(2)驱动态裂缝网络系统的分区闭合及动态储容效应,以及反演动态裂缝网络特征参数,建立一种动态裂缝网络水平井试井模型,采用半解析方法、Laplace转换、动态裂缝特征函数、杜哈美原理和Stehfest数值反演求解试井模型,获得井底压力响应半解析解,绘制井底压力响应曲线,对动态裂缝闭合速度、井筒储集系数、动态裂缝网络半径和动态储容比进行敏感性分析。结果表明:考虑致密储层CO_(2)驱动态裂缝网络的压力图版与常规压力图版存在显著差异;井底压力响应曲线呈异常尖峰和额外双水平线特征,ψ′wD t D<0.5;动态裂缝闭合速度、动态裂缝网络半径及动态储容比对井底压力响应影响较大。动态裂缝网络水平井试井模型能有效定量表征致密储层长期注入CO_(2)的动态裂缝网络行为及非稳态渗流规律,为CO_(2)强化致密储层开发提供依据。展开更多
To date,the primary industrial carbon capture approach is still absorption using aqueous solutions of alkanolamines.Here,to pursue a substitute for the amine-based approach to improve the CO_(2) capture efficiency and...To date,the primary industrial carbon capture approach is still absorption using aqueous solutions of alkanolamines.Here,to pursue a substitute for the amine-based approach to improve the CO_(2) capture efficiency and decrease the energy cost further,we report a new carbon capture approach using a 2-methylimidazole(mIm)aqueous solution.The properties and sorption behaviors of this approach have been experimentally investigated.The results show that the mIm solution has higher CO_(2) absorption capacity under relatively higher equilibrium pressure(>130 kPa)and lower desorption heat than the methyldiethanolamine solution.91.6%sorption capacity of mIm solution can be recovered at 353.15 K and 80 kPa.The selectivity for CO_(2)/N_(2) and CO_(2)/CH_(4) can reach an exceptional 7609 and 4324,respectively.Furthermore,the pilot-scale tests were also performed,and the results demonstrate that more than 98%of CO_(2) in the feed gas could be removed and cyclic absorption capacity can reach 1 mol·L^(-1).This work indicates that mIm is an excellent alternative to alkanolamines for carbon capture in the industry.展开更多
文摘A micro shear testing method which can suit to measure the mechanical properties of heterogeneous materials is introduced, and the properties in each zone of welded joint for CO2 arc welding can be evaluated by using this method in this paper. Moreover, these results are compared with those results of Charpy V-notch impact test and their correlation is discussed.
文摘为有效表征流体在致密储层CO_(2)驱动态裂缝网络系统的分区闭合及动态储容效应,以及反演动态裂缝网络特征参数,建立一种动态裂缝网络水平井试井模型,采用半解析方法、Laplace转换、动态裂缝特征函数、杜哈美原理和Stehfest数值反演求解试井模型,获得井底压力响应半解析解,绘制井底压力响应曲线,对动态裂缝闭合速度、井筒储集系数、动态裂缝网络半径和动态储容比进行敏感性分析。结果表明:考虑致密储层CO_(2)驱动态裂缝网络的压力图版与常规压力图版存在显著差异;井底压力响应曲线呈异常尖峰和额外双水平线特征,ψ′wD t D<0.5;动态裂缝闭合速度、动态裂缝网络半径及动态储容比对井底压力响应影响较大。动态裂缝网络水平井试井模型能有效定量表征致密储层长期注入CO_(2)的动态裂缝网络行为及非稳态渗流规律,为CO_(2)强化致密储层开发提供依据。
基金The financial supports received from National Natural Science Foundation of China (U20B6005, 22178378, and 22127812)
文摘To date,the primary industrial carbon capture approach is still absorption using aqueous solutions of alkanolamines.Here,to pursue a substitute for the amine-based approach to improve the CO_(2) capture efficiency and decrease the energy cost further,we report a new carbon capture approach using a 2-methylimidazole(mIm)aqueous solution.The properties and sorption behaviors of this approach have been experimentally investigated.The results show that the mIm solution has higher CO_(2) absorption capacity under relatively higher equilibrium pressure(>130 kPa)and lower desorption heat than the methyldiethanolamine solution.91.6%sorption capacity of mIm solution can be recovered at 353.15 K and 80 kPa.The selectivity for CO_(2)/N_(2) and CO_(2)/CH_(4) can reach an exceptional 7609 and 4324,respectively.Furthermore,the pilot-scale tests were also performed,and the results demonstrate that more than 98%of CO_(2) in the feed gas could be removed and cyclic absorption capacity can reach 1 mol·L^(-1).This work indicates that mIm is an excellent alternative to alkanolamines for carbon capture in the industry.
