检索结果-内蒙古大学图书馆

Table optimization of operating conditions for a Superwetting Ultrafiltration ZrO2 Ceramic Membrane

JOURNAL OF ENVIRONMENTAL ENGINEERING 2020年第4期146卷

作者： Zoubeik, Mohamed Salama, Amgad Henni, Amr Univ Regina Produced Water Treatment Lab Fac Engn & Appl Sci Regina SK S4S 0A2 Canada

This paper represents an experimental and modeling study on the performance of a novel superwetting zirconium dioxide ultrafiltration membrane. The effects of different operating conditions were tested using an oily emulsion representing water produced from the Bakken oil reservoir (Canada). The Taguchi experimental methodology was used to predict the optimal operating conditions, and the results were validated experimentally. At optimal conditions, the ceramic membrane showed excellent performance for oil, total organic carbon (TOC), and turbidity rejections of 98%, 99%, and 99%, respectively. The highest flux achieved was 1,007 L/h center dot m2 at a transmembrane pressure (TMP) of 0.12 MPa (1.2 bar). pH was found to have the greatest contribution to oil rejection. After chemical cleaning, a high flux recovery of more than 97% was obtained. Hermia's cake formation model had the closest correlation to the experimental data. Finally, an artificial neural network (ANN) model was used to fit the experimental data. The best fit was reached using the Bayesian regularization training algorithm. (c) 2020 American Society of Civil Engineers.

关键词： Ceramic membranes Taguchi method optimization of operating conditions Produced water Artificial neural network (ANN)

来源：评论

学校读者我要写书评

暂无评论

Enhanced exergy cost optimization of operating conditions in FCCU main fractionator

引用

Chinese Journal of Chemical Engineering 2018年第8期26卷 1750-1757页

作者： Chonglin Zhong Yi Zheng Shenghu Xu Shaoyuan Li Department of Automation Shanghai Jiao Tong UniversityKey Laboratory of System Control and Information ProcessingMinistry of EducationShanghai 200240China SinopecJiujiang Branch Corporation Jiufiang 332004China

Exergy indicates the maximal energy that can do work effectively. Different from optimization of product quality or calculation of generic energy conservation in most previous studies, the application of exergy analysis and exergy cost optimization in petrochemical industry is of great economic and environmental significance. Based on the main fractionator in Jiujiang Petrochemical Complex No. 2 FCCU, an enhanced exergy cost optimization under different operating conditions by adjusting set points of temperature and valves opening degree for flow control is studied in this paper in order to reduce exergy cost and improve the quality of energy. A steadystate optimization algorithm to enhance exergy availability and an objective function comprehensively considering exergy loss are proposed. On the basis of ensuring the quality of petroleum products, the economic benefits can be improved by optimizing the controllable variables due to the fact that exergy cost is decreased.

关键词： Exergy optimization of operating conditions Fractionator FCCU Exergy Cost

来源：评论

学校读者我要写书评

暂无评论

Enhanced Exergy Cost optimization of operating conditions in FCCU Main Fractionator

Enhanced Exergy Cost Optimization of Operating Conditions in...

引用

第28届中国过程控制会议（CPCC 2017）暨纪念中国过程控制会议30周年

作者： ZHONG Chonglin ZHENG Yi LI Shaoyuan Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education

Exergy indicates the maximal energy that can do work *** from the limited optimization of product quality or the calculation of generic energy conservation in most previous studies,the application of exergy analysis and exergy cost optimization in petrochemical industry is of great economic and environmental *** on the FCCU main fractionator in Jiujiang Petrochemical Complex No.2 FCCU,an enhanced exergy cost optimization under different operating conditions by adjusting set points of temperature and valves opening degree for flow control are studied in this paper in order to reduce exergy cost and improve the quality of energy.A steady-state optimization algorithm to enhance exergy availability and an objective function comprehensively considering exergy loss are *** the basis of ensuring the quality of petroleum products,the economic benefits can be improved by optimizing the controllable variables due to the fact that exergy cost is decreased.

关键词： Exergy optimization of operating conditions Fractionator FCCU Exergy Cost

来源：评论

学校读者我要写书评

暂无评论

Study of energy density of adsorption-based thermal energy storage system under different operating conditions for SAPO-34

引用

ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY 2021年第4期27卷 629-636页

作者： Carrier, Ye Strong, Curtis Lefebvre, Dominique Tezel, F. Handan Univ Ottawa Dept Chem & Biol Engn 161 Louis Pasteur Ottawa ON K1N 6N5 Canada

The water vapor and the silico-alumino-phosphate (SAPO-34) material has been recognized to be one of the better adsorbate-adsorbent pairs for the packed-bed adsorptive thermal energy storage (TES) systems for space heating applications. In this paper, operating conditions including the system construction materials selection, cooling methods of the system after regeneration, relative humidity (RH) of inlet air, and packed-bed regeneration temperatures have been examined for the TES system performance evaluation and process design optimization purposes.

关键词： Thermal energy storage Adsorption Water adsorption from air optimization of operating conditions

来源：评论

学校读者我要写书评

暂无评论

Strategies for simultaneous improvement of reaction rate and caustic efficiency of brine electrolyzer

引用

CHEMICAL ENGINEERING JOURNAL 2023年 476卷

作者： Kim, Jaewon Abbas, Saleem Shin, Hyun-Jin Rizvi, Syed B. H. Lee, Ki Bong Ha, Heung Yong Korea Inst Sci & Technol KIST Ctr Energy Storage Res Seoul 02792 South Korea Korea Univ Dept Chem & Biol Engn 145 Anam Ro Seoul 02841 South Korea Univ Sci & Technol UST KIST Sch Div Energy & Environm Technol Seoul 02792 South Korea

Brine electrolyzers can produce HCl and NaOH concurrently using NaCl-concentrated wastewater discharged from various desalination processes. However, the electrolyzers still have poor performance, and thus commercialization is retarded. The main factor affecting the performance of this technology is the trade-off between reaction rate and caustic efficiency. This study aims to improve the reaction rate and caustic efficiency simultaneously by optimizing the operating conditions of the electrolyzer. Through various experiments, we have found that increasing the applied voltage and operating temperature can effectively enhance the reaction rate and caustic efficiency. This is because the relative permeation rate of sodium ions over protons through the Nafion membrane increases with temperature and applied voltage. Under the optimal conditions, the reaction rate is significantly enhanced by 2.1 times (from 86.5 mA cm-2 to 179.2 mA cm-2) and the caustic efficiency by 1.6 times (from 56% to 90%) compared to the standard conditions. The mechanism for the improved performance is revealed by investigating the permeation behavior of ions through the membrane. It is found that protons hinder the permeation of sodium ions, but increasing the temperature and/or applied voltage overcomes this interference. A long-term test for 1600 h confirms the stability and feasibility of the electrolyzer. Overall, this study is expected to contribute to commercializing brine electrolyzers for HCl and NaOH production.

关键词： Brine electrolyzer NaOH production HCl production Ion permeation optimization of operating conditions

来源：评论

学校读者我要写书评

暂无评论

Actor-critic reinforcement learning to estimate the optimal operating conditions of the hydrocracking process

引用

COMPUTERS & CHEMICAL ENGINEERING 2021年 149卷 107280-107280页

作者： Oh, Dong-Hoon Adams, Derrick Nguyen Dat Vo Gbadago, Dela Quarme Lee, Chang-Ha Oh, Min Yonsei Univ Dept Chem & Biomol Engn Seoul South Korea Inha Univ Grad Sch Chem & Chem Engn Incheon South Korea Hanbat Natl Univ Dept Chem & Biol Engn Daejeon South Korea

Determining the optimal operating conditions for hydrocracking units is imperative due to the changing nature of production requirements. However, it is expensive to optimize the hydrocracking process with mathematical models because hydrocracking units have a limited capacity for quick response and customization. This study proposes an actor-critic reinforcement learning optimization strategy using a DNN surrogate model, which was developed from a validated mathematical model with a marginal error of less than 2%. The surrogate model interacted with the A2C algorithm and the optimal operating conditions were determined with an accuracy of 97.86% and 98.5%. To demonstrate the reliability, case studies were executed;the strategy was found to be consistent, with an average efficiency of 98%. The proposed approach offers the advantages of quick response time, low computational burden and customizability for online implementation, which are essential for practical optimization problems. It can be extended beyond hydrocracking to other chemical industries. (C) 2021 Elsevier Ltd. All rights reserved.

关键词： Hydrocracking process Mathematical modeling Deep neural network Surrogate model Actor-critic reinforcement learning optimization of operating conditions

来源：评论

学校读者我要写书评

暂无评论

optimization of operating parameters for inductively coupled plasma mass spectrometry: A computational study

引用

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY 2012年 76卷 56-64页

作者： Aghaei, Maryam Lindner, Helmut Bogaerts, Annemie Univ Antwerp Dept Chem Res Grp PLASMANT B-2610 Antwerp Belgium

An inductively coupled plasma, connected to a mass spectrometer interface, is computationally investigated. The effect of pressure behind the sampler, injector gas flow rate, auxiliary gas flow rate, and applied power is studied. There seems to be an optimum range of injector gas flow rate for each setup which guaranties the presence and also a proper length of the central channel in the torch. Moreover, our modeling results show that for any specific purpose, it is possible to control that either only the central gas flow passes through the sampler orifice or that it is accompanied by the auxiliary gas flow. It was also found that depending on geometry, the variation of outgoing gas flow rate is much less than the variation of the injector gas flow rate and this causes a slightly higher pressure inside the torch. The general effect of increasing the applied power is a rise in the plasma temperature, which results in a higher ionization in the coil region. However, the negative effect is reducing the length of the cool central channel which is important to transfer the sample substances to the sampler. Using a proper applied power can enhance the efficiency of the system. Indeed, by changing the gas path lines, the power can control which flow (i.e., only from injector gas or also from the auxiliary gas) goes to the sampler orifice. Finally, as also reported from experiments in literature, the pressure behind the sampler has no dramatic effect on the plasma characteristics. (c) 2012 Elsevier B.V. All rights reserved.

关键词： Inductively coupled plasma mass spectroscopy Fundamental study Computational study optimization of operating conditions

来源：评论

学校读者我要写书评

暂无评论

Inductively coupled plasma atomic emission spectrometry - optimization of the operating conditions in the determination of trace of elements in line-rich emission matrices

引用

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY 2007年第4期62卷 386-402页

作者： Velitchkova, N. Velichkov, S. Daskalova, N. Bulgarian Acad Sci Inst Gen & Inorgan Chem BU-1113 Sofia Bulgaria Bulgarian Acad Sci Inst Geol BU-1113 Sofia Bulgaria

Radial viewing 40.68 MHz inductively coupled plasma atomic emission spectrometer was used in the determination of Y, Sc and rare earth elements in Eu2O3 or Lu2O3 as pure rare earth matrices. The Mg II 280.270 nm/Mg I 285.213 nm line intensity ratio was measured to evaluate the robustness of the operating conditions. The operating conditions were affected by varying the incident power and sheathing gas flow rate. The carrier gas flow rate remained a constant value. The relationship between the Mg II 280.270 nm/Mg I 285.213 nm ratio and the excitation temperature was obtained. A dependence of the magnesium ratio in the pure solvent and the corresponding values in the presence of the above matrices was established. Improvement of the detection limits was achieved by optimization of the operating conditions. The lowest detection limits were obtained under non-robust conditions in a pure solvent and in the presence of 10 mg ml(-1) Eu2O3 or Lu2O3, respectively. Comparative data on the detection limits based on two ICP systems are shown. (c) 2007 Elsevier B.V. All rights reserved.

关键词： ICP-AES traces of rare earth elements rare earth matrices optimization of operating conditions detection limits

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：