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Theoretical elucidation of rare earth extraction and separation by diglycolamides from crystal structures and DFT simulations

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Journal of Rare Earths 2021年第7期39卷 858-865,I0004页

作者： Xiujing Peng jianhui su Hao Li Yu Cui Jin Yong Lee Guoxin sun Institute for Smart Materials&Engineering School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China Department of Chemistry Sungkyunkwan UniversitySuwon 16419Republic of Korea

Diglycolamides(DGAs) show excellent application prospects for the extraction and separation of rare earth metals from highly radioactive liquid wastes and rare earth *** extraction ability of DGAs for rare earth ions in nitrate or chloride media increases with increasing atomic number of the rare earth *** understand the origin of this phenomenon,three binuclear crystals [Ln(TEDGA)_(3)][Ln(NO_(3))_(6)] of N,N,N’,N’-tetraethyldiglycolamide(TEDGA) with rare earth ions La(Ⅲ),Pr(Ⅲ) and Eu(III) were prepared and characterized *** three complexes belong to the triclinic crystal system,P-1 space *** bond lengths of Ln-O_(amide) are significantly shorter than those of Ln-O_(ether) in the same *** Ln-O_(amide) and Ln-O_(enher) bond lengths gradually decrease with increasing atomic number of the rare earth *** dihedral angle formed by TEDGA and metal ions through the tridentate coordination gradually increases with increasing metal ion atomic number,tending toward the formation of sizeable planar coordination structures for the most massive rare earth *** structures of the compounds formed by the extractant and metal ion were optimized by means of DFT *** find that the interaction between TEDGA and the rare earth ion is dominated by electrostatic interaction by analyzing binding energy,WBIs,Mulliken charge,natural electron configurations,and molecular orbital *** covalent component of the Ln-O bonds of the complexes increases with increasing metal atomic *** observed increase in extraction and separation capacity of diglycolamides for rare earth ions with increasing atomic number might be due to the formation of two fivemember rings by one tridentate *** rare earth ions with large atomic numbers tend to form planar structures with large dihedral angles with DGA ligands.

关键词： Diglycolamide Extraction Separation Rare earth Crystal structures DFT simulations

Constructing a stable interface on Ni-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cathode via lactic acid-assisted engineering strategy

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Journal of Energy Chemistry 2024年第3期90卷 412-422,I0010页

作者： Weijian Tang Chengzhi Hu AFei Li Xiaoqin Huang Zhangxian Chen jianhui su Weixin Zhang Institute of Energy Hefei Comprehensive National Science CenterHefei 230031AnhuiChina School of Chemistry and Chemical Engineering Hefei University of Technology and Anhui Key Laboratory of Controllable Chemical Reaction&Material Chemical EngineeringHefei 230009AnhuiChina School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009AnhuiChina

Ni-rich layered oxides are potential cathode materials for next-generation high energy density Li-ion batteries due to their high capacity and low ***,the inherently unstable surface properties,including high levels of residual Li compounds,dissolution of transition metal cations,and parasitic side reactions,have not been effectively addressed,leading to significant degradation in their electrochemical *** this study,we propose a simple and effective lactic acid-assisted interface engineering strategy to regulate the surface chemistry and properties of Ni-rich LiNi_(0.8)Co_(0.1)Mr_(0.1)O_(2) *** novel surface treatment method successfully eliminates surface residual Li compounds,inhibits structural collapse,and mitigates cathode-electrolyte interface film *** a result,the lactic acidtreated LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) achieved a remarkable capacity retention of 91.7% after 100 cycles at 0.5 C(25℃) and outstanding rate capability of 149.5 mA h g^(-1) at 10 C,significantly outperforming the pristine ***,a pouch-type full cell incorporating the modified LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cathode demonstrates impressive long-term cycle life,retaining 81.5% of its capacity after 500 cycles at 1 *** importantly,the thermal stability of the modified cathode is also dramatically *** study offers a valuable surface modification strategy for enhancing the overall performance of Ni-rich cathode materials.

关键词： Residual Li Lactic acid surface modification Carbon coating Layered cathode Ni-rich

The Model of Inverter Filter Circuit and Its Resonant Characteristics Analysis Considering Effects of Power Grid Impedance 36

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The Model of Inverter Filter Circuit and Its Resonant Charac...

Strategies for improving extraction capacity through preorganization structure:A novel 5,6-bicyclicmalonamide extractant(THPPD)

第36届中国控制会议

作者： Wenjin Wu jianhui su Jianguo Wang Jidong Lai Shanhe Jiang School of electrical engineering and automation Hefei University of Technology School of Physics and Electrical Engineering of Anqing Normal University

ISBN: (纸本)9781538629185

The photovoltaic grid-connected power system filter interface circuit analysis and optimization design is the important measure to improve the system stability and grid power *** paper analyzes the three-phase LCL filter interface circuit model respectively on ABC coordinates and αβ *** frequency characteristic of L,LC,LCL three kinds of filter carries out comparative *** mechanism is analyzed about that the frequency characteristic of the LCL filter circuit is how to change under the different harmonic excitation *** the MATLAB the simulation model of the photovoltaic grid-connected power system is constructed,and the simulation results show that the proposed analysis method is effective.

关键词： Photovoltaic inverter grid-connected filter interface circuit frequency characteristics the harmonic resonant characteristics

来源： cnki会议评论

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Journal of Rare Earths 2024年第4期42卷 768-774页

作者： Miaomiao Zhang Zhen Yang Yuhua Cui jianhui su Heng Zhao Chengjin Xu Xiaolei Liu Guoxin sun Xiujing Peng Yu Cui School of Chemistry and Chemical Engineering University of JinanJinan250022China Institute for Smart Materials&Engineering University of JinanJinan250022China Shandong Institute for Food and Drug Control Jinan250101China

Rational design of extractant structure to improve the extraction and separation capacity of rare earth elements(REEs)is a long-standing ***,a new strategy was proposed to improve the stability of the chelating structure formed by malonamide and *** stability of the chelating structure is greatly improved by using a double-ring framework structure which makes the two carbonyl groups of malonamide unable to rotate freely and both of them point to the metal ion *** benzyl groups were used to construct the hydrophobicity of the extractant and the organic shell of the extracted ***-pyrrolo-pyridine-dione(THPPD)was designed and *** structure reduces the energy consumed by rotating carbonyl group in the coordination with metal ions and then improves the extraction ability of *** crystal structure was preorganized as expected,with the two carbonyls pointing in a favorable coordination direction to the structural complement of the metal *** extraction behaviors of REEs with THPPD in a nitric acid medium were *** with N,N’-dibenzyl-N,N’-dimethylmalonamide(DBDM-MA)with a chain structure,the extraction capacity of THPPD is 360 times higher than that of DBDM-MA at 5.0 mol/L sodium ***,the binding energy and Gibbs free energy were investigated by density functional theory(DFT)in conjunction with the *** theoretical results show that THPPD has more effective interaction with Pr(NO_(3))3 than *** construction of chelating groups conformation is a worthy direction to improve the coordination ability and even selectivity of extractant.

关键词： Rare earth elements Extraction separation 5,6-bicyclicdiamide extractant

An adaptive control strategy for microgrid secondary frequency based on parameter identification

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Global Energy Interconnection 2023年第5期6卷 592-600页

作者： Yong Shi Yin Cheng Bao Xie jianhui su Photovoltaic System Engineering Research Center of the Ministry of Education Hefei University of TechnologyHefei 230009P.R.China State Grid Wuhu Power supply Company Wuhu 241000P.R.China

Complex microgrid structures and time-varying conditions, among other factors, cause problems in the mechanical modeling of microgrids, making model-based controller optimization difficult. Therefore, this study proposed a secondary frequency adaptive control strategy based on parameter identification, which uses an online parameter identification method to identify the parameters in the microgrid in real-time. The identified parameters are then used in the secondary frequency adaptive controller to optimize the real-time controller performance. The proposed method realizes adaptive optimization of the controller in the microgrid operation state and is applied to a microgrid with unknown parameters to adjust the controller parameters. Finally, a simulation experiment was conducted to verify the model accuracy and the frequency regulation effect of the proposed adaptive control strategy.

关键词： Adaptive control Genetic algorithm Microgrid Online identification

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光伏水泵集中群控系统的流量优化算法研究

太阳能学报 2017年第1期38卷 264-270页

作者：程文苏建徽合肥工业大学电气与自动化工程学院教育部光伏系统工程研究中心合肥230009

针对多台水泵并联运行的光伏水泵集中群控系统,提出一种流量优化算法,实现系统功率的合理分配,并以预估流量最优值方式控制各单元的启停投切,使群控系统全天运行在流量最优的工况下。该文建立水泵并联装置的数学模型,由实验得到额定转... 详细信息

针对多台水泵并联运行的光伏水泵集中群控系统,提出一种流量优化算法,实现系统功率的合理分配,并以预估流量最优值方式控制各单元的启停投切,使群控系统全天运行在流量最优的工况下。该文建立水泵并联装置的数学模型,由实验得到额定转速下扬程曲线、功率曲线的性能参数,并利用Newton迭代法求解系统工况。实验和仿真结果,表明采用该流量优化算法后,系统的日扬水量得到显著增加。

关键词：群控系统流量优化算法扬程曲线日扬水量

并网逆变系统滤波电路拓扑及其谐振抑制方法研究

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太阳能学报 2013年第9期34卷 1619-1625页

作者：苏建徽施永合肥工业大学能源所教育部光伏系统工程研究中心合肥230009

针对三相并网LCL滤波器并网接口的谐振问题和无源阻尼滤波器的功率损耗问题,在无源阻尼LCL滤波器基础上进行改进,提出改进型的阻尼谐振LCL逆变器。阻尼谐振型LCL滤波器在阻尼支路上并联LC谐振支路,为载波频率附近的谐波电流提供低阻通路... 详细信息

针对三相并网LCL滤波器并网接口的谐振问题和无源阻尼滤波器的功率损耗问题,在无源阻尼LCL滤波器基础上进行改进,提出改进型的阻尼谐振LCL逆变器。阻尼谐振型LCL滤波器在阻尼支路上并联LC谐振支路,为载波频率附近的谐波电流提供低阻通路,增强滤波效果,减小阻尼电阻的功率损耗。综合考虑滤波器参数对滤波效果、阻尼效果和阻尼损耗的影响,给出滤波器参数设计的方法,最后通过仿真实验加以验证。

关键词： LCL 滤波器无源阻尼谐振功率损耗并网逆变器

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考虑日照分布的光伏水泵优化配置仿真研究

太阳能学报 2020年第1期41卷 86-91页

作者：刘鹏苏建徽合肥工业大学电气与自动化工程学院合肥230009 教育部光伏系统工程研究中心合肥230009

针对光伏水泵系统的全日综合扬水效率与其各单元的匹配和优化设计密切相关的问题,将成本、效率、扬水量要求作为系统的优化目标,把影响指标的因素考虑到安装地点、安装倾角、阵列配置、水泵特性、管路特性等多个变量,进而提出一种以典... 详细信息

针对光伏水泵系统的全日综合扬水效率与其各单元的匹配和优化设计密切相关的问题,将成本、效率、扬水量要求作为系统的优化目标,把影响指标的因素考虑到安装地点、安装倾角、阵列配置、水泵特性、管路特性等多个变量,进而提出一种以典型等效日照强度分布函数为条件的数值分析优化方法,化复杂为简单,并通过算例对优化过程和方法进行表述,优化过程和例算结果表明该优化方法具有工程实用价值。

关键词：光伏效率优化光伏水泵日照强度水泵特性

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微网孤岛运行模式下的调频控制策略

电力系统自动化 2017年第8期41卷 110-115页

作者：郭蕾苏建徽施永合肥工业大学教育部光伏系统工程研究中心安徽省合肥市230009

针对采用下垂控制的逆变器组成的微网,研究其孤岛运行模式下的调频控制策略。通过对系统进行建模分析,并将传递函数进行有效的等效与化简,推导出调频控制器的参数校正公式。当系统工况改变导致分配特性、输出阻抗以及接入条件改变时,该... 详细信息

针对采用下垂控制的逆变器组成的微网,研究其孤岛运行模式下的调频控制策略。通过对系统进行建模分析,并将传递函数进行有效的等效与化简,推导出调频控制器的参数校正公式。当系统工况改变导致分配特性、输出阻抗以及接入条件改变时,该控制器都可以在线调整参数值,使系统频率迅速恢复稳定。实验结果证明,引入该参数自动调节算法后,系统参数改变时调频控制算法可以很快恢复到给定频率,并保持频率稳定。

关键词：微网(微电网) 二次调频传递函数参数自动调节