针对天然气开采与运输过程中的水合物堵塞风险,基于热力学相平衡原理,采用PVTsim软件构建多参数耦合预测模型,系统探究了烃类组分、杂质气体、液体组分及热力学抑制剂对水合物相平衡特性的影响机制。通过整合Chen-Guo模型、van der Waal...针对天然气开采与运输过程中的水合物堵塞风险,基于热力学相平衡原理,采用PVTsim软件构建多参数耦合预测模型,系统探究了烃类组分、杂质气体、液体组分及热力学抑制剂对水合物相平衡特性的影响机制。通过整合Chen-Guo模型、van der Waals-Platteeuw方程及电解质扩展模块,定量揭示了各因素的动态作用规律。结果表明:重烃组分(C_(2)H_(6)~C_(4)H_(10))通过范德华力强化晶格稳定性,使0℃相平衡压力最大降幅达77.5%;H_(2)S因分子极性显著降低生成压力阈值,而N_(2)通过稀释效应提升压力4.7%,呈现竞争性调控特征;盐类抑制作用由强到弱依次遵循CaCl_(2)、NaCl、KCl顺序,质量分数为3%的CaCl_(2)在20MPa时,受Ca^(2+)的高电荷密度效应影响,平衡温度降低9.89℃;热力学抑制剂PGME因醚键羟基协同作用,在20℃时压力阈值提升至20MPa,较传统MeOH高温稳定性提升40%。展开更多
Prediction and design of various nanomaterials is a long-term dream in nanoscience and nanotechnology, which depends on the deep understanding on the growth mechanism. Herein, we report the successful prediction on th...Prediction and design of various nanomaterials is a long-term dream in nanoscience and nanotechnology, which depends on the deep understanding on the growth mechanism. Herein, we report the successful prediction on the growth of Al N nanowires by nitriding Al69Ni31 alloy particles across the liquid-solid(β) phase region(1133–1638°C) based on the phase-equilibrium-dominated vapor-liquid-solid(PED-VLS) mechanism proposed in our previous study. All predictions about the growth of Al N nanowires, the evolutions of lattice parameters and geometries of the coexisting Al-Ni alloy phases are experimentally confirmed quantitatively. The preconditions for the applicability of the PED-VLS mechanism are also clarified. This progress provides the further evidence for the validity of the PED-VLS mechanism and demonstrates a practical guidance for designing and synthesizing different nanomaterials according to corresponding phase diagrams based on the insight into the growth mechanism.展开更多
文摘针对天然气开采与运输过程中的水合物堵塞风险,基于热力学相平衡原理,采用PVTsim软件构建多参数耦合预测模型,系统探究了烃类组分、杂质气体、液体组分及热力学抑制剂对水合物相平衡特性的影响机制。通过整合Chen-Guo模型、van der Waals-Platteeuw方程及电解质扩展模块,定量揭示了各因素的动态作用规律。结果表明:重烃组分(C_(2)H_(6)~C_(4)H_(10))通过范德华力强化晶格稳定性,使0℃相平衡压力最大降幅达77.5%;H_(2)S因分子极性显著降低生成压力阈值,而N_(2)通过稀释效应提升压力4.7%,呈现竞争性调控特征;盐类抑制作用由强到弱依次遵循CaCl_(2)、NaCl、KCl顺序,质量分数为3%的CaCl_(2)在20MPa时,受Ca^(2+)的高电荷密度效应影响,平衡温度降低9.89℃;热力学抑制剂PGME因醚键羟基协同作用,在20℃时压力阈值提升至20MPa,较传统MeOH高温稳定性提升40%。
基金supported by the National Natural Science Foundation of China(NSFC)(2107308521173115 and 21373108)+1 种基金the Major State Basic Research Development Program of China(2013CB932902)the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Prediction and design of various nanomaterials is a long-term dream in nanoscience and nanotechnology, which depends on the deep understanding on the growth mechanism. Herein, we report the successful prediction on the growth of Al N nanowires by nitriding Al69Ni31 alloy particles across the liquid-solid(β) phase region(1133–1638°C) based on the phase-equilibrium-dominated vapor-liquid-solid(PED-VLS) mechanism proposed in our previous study. All predictions about the growth of Al N nanowires, the evolutions of lattice parameters and geometries of the coexisting Al-Ni alloy phases are experimentally confirmed quantitatively. The preconditions for the applicability of the PED-VLS mechanism are also clarified. This progress provides the further evidence for the validity of the PED-VLS mechanism and demonstrates a practical guidance for designing and synthesizing different nanomaterials according to corresponding phase diagrams based on the insight into the growth mechanism.
