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Analysis of unbalanced pressure PEM electrolyzer for high pressure hydrogen production

Chemical engineering Transactions 2017年 57卷 1615-1620页

作者： Saebea, Dang Patcharavorachot, Yaneeporn Hacker, Viktor Assabumrungrat, Sutthichai Arpornwichanop, Amornchai Authayanun, Suthida Department of Chemical Engineering Faculty of Engineering Burapha University Chonburi20131 Thailand School of Chemical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok10520 Thailand Institute of Chemical Engineering and Environmental Technology Graz University of Technology Inffeldgasse 25C Graz8010 Austria Center of Excellence in Catalysis and Catalytic Reaction Engineering Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Computational Process Engineering Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Department of Chemical Engineering Faculty of Engineering Srinakharinwirot University Nakhon Nayok26120 Thailand

ISBN: (纸本)9788895608488

Proton exchange membrane (PEM) electrolyzer is a promising technology and likely to be an important hydrogen generator. The ability to produce high purity hydrogen and deliver it at relatively high pressure is an important advantage of the PEM electrolyzer technology. In this work, the high pressure PEM electrolyzer without the need for external compression is studied. The simulation of the electrolyzer is performed based on an electrochemical model with consideration of hydrogen permeation. The effect of cathode pressure and membrane thickness on electrolyzer performance is studied. The explosion limit of a hydrogen-oxygen mixture in the anode is also taken into consideration. The electrochemical compression shows advantage in term of delivering hydrogen at high pressure with having less effect on performance and low power requirement. The increase of cathode pressure slightly affects the electrolyzer performance. The high pressure operation at the cathode and the use of thin membranes cause hydrogen crossover from the cathode to anode, especially at high current density operation. © Copyright 2017, AIDIC Servizi S.r.l.

关键词： Cathodes

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Performance analysis and control structure design for proton exchange membrane fuel cell

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Chemical engineering Transactions 2016年 52卷 997-1002页

作者： Chatrattanawet, Narissara Hakhen, Thanaphorn Saebea, Dang Arpornwichanop, Amornchai Computational Process Engineering Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Department of Chemical Engineering Faculty of Engineering Burapha University Chonburi20131 Thailand

ISBN: (纸本)9788895608426

A proton exchange membrane fuel cell (PEMFC) is regarded as a highly efficient power generation device. The performance of PEMFC depends on various key operating parameters, such as pressure, flow rate and humidity of reactant gases, and cell temperature (60 - 100 °C). Generally, the cell temperature is known to have an importance on transportation within the PEMFC and its performance. The fuel cell temperature should be limited under a working temperature that does not affect the material properties of the components. Therefore, the aim of this study is to perform the control structure design of the PEMFC. The steady-state analysis is done to find the suitable operating conditions of the PEMFC. The effect of input parameters on cell voltage and cell temperature is analyzed to investigate the dynamic behavior of PEMFC that is important for control design. To obtain an efficient control system, the suitable controlled and manipulated variables of the PEMFC are determined via the control structure design approach. The selection of input-output pairings is based on the relative gain array (RGA) as a controllability index. The results show that the cell voltage and cell temperature depend on the inlet molar flow rates and temperatures of hydrogen and air, and operating current density. According to the RGA, the inlet molar flow rates of air and hydrogen are manipulated variables to regulate the cell temperature and partial pressure of hydrogen, respectively. Copyright © 2016, AIDIC Servizi S.r.l.

关键词： Hydrogen

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高温质子交换膜燃料电池的研究进展(英文)

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催化学报 2015年第4期36卷 473-483页

作者： Suthida Authayanun Karittha Im-orb Amornchai Arpornwichanop Department of Chemical Engineering Faculty of Engineering Srinakharinwirot University Computational Process Engineering Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University

Due to the need for clean energy, the development of an efficient fuel cell technology for electricity generation has received considerable attention. Much of the current research efforts have investi-gated the materials for and process development of fuel cells, including the optimization and simpli-fication of the fuel cell components, and the modeling of the fuel cell systems to reduce their cost and improve their performance, durability and reliability to enable them to compete with the con-ventional combustion engine. A high temperature proton exchange membrane fuel cell(HT-PEMFC) is an interesting alternative to conventional PEMFCs as it is able to mitigate CO poisoning and water management problems. Although the HT-PEMFC has many attractive features, it also possesses many limitations and presents several challenges to its widespread commercialization. In this re-view, the trends of HT-PEMFC research and development with respect to electrochemistry, mem-brane, modeling, fuel options, and system design were presented.

关键词：质子交换膜燃料电池高温燃料电池系统燃料电池技术一氧化碳中毒 PEMFC 清洁能源电池组件

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Effect of operating condition on electrical resistance and voltage efficiency of an electrochemical cell in a vanadium redox flow battery

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Chemical engineering Transactions 2015年 45卷 943-948页

作者： Ngamsai, Kittima Arpornwichanop, Amornchai Computational Process Engineering Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand

ISBN: (纸本)9788895608365

Effect of electrical resistance in the electrochemical cell of a vanadium redox flow battery system on system efficiency is important. Suitable operating conditions can be determined to improve the efficiency of the system without additional cost. In this study, the effect of key parameters, such as, percent compression of fibre electrode, flow rate of electrolyte solution, current density and state of charge (SOC), on the cell electrical resistance and voltage efficiency is analyzed. The results show that the percent compression of fibre electrode and flow rate of electrolyte solution cannot be independently considered due to their coupling effect. Higher percent compression (50 %) and flow rate contribute to the lowest electrical resistance and highest voltage efficiency of the cell. The current density slightly affects the electrical resistance but significantly affects the voltage efficiency of the cell. It shows that high voltage efficiency of the cell is obtained at low current density operation. It is also found that the cell resistance is minimized when the voltage efficiency shows the highest value at 50 %SOC. Copyright © 2015, AIDIC Servizi S.r.l.,.

关键词： Flow rate

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Performance improvement of biomass gasification and PEMFC integrated system-design consideration for achieving high overall energy efficiency and power-to-heat ratio variation

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Chemical engineering Transactions 2015年 43卷 1501-1506页

作者： Chutichai, Bhawasut Arpornwichanop, Amornchai Computational Process Engineering Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand

ISBN: (纸本)9788895608341

A proton exchange membrane fuel cell (PEMFC) has received considerable attention as an alternative power generation device. Using biomass to produce hydrogen via a gasification process makes the integrated system of the PEMFC and biomass gasification a potential power production technology. In this study, the performance of the biomass gasification and PEMFC system is theoretically analyzed. Two important operational issues of the system, i.e., waste heat recovery and response to variation in power-to-heat ratio, are considered. The capacity of the PEMFC system is selected to cover a daily residential power demand of 100 kW. In the proposed system, useful heat from the biomass processing and PEMFC is recovered for use in space heat or water heating in household. The simulation result shows that the PEMFC stack efficiency of the proposed system is around 47 to 57 %. The efficiency of the combined heat and power system is in range of 68 to 93 %, which is based on biomass input energy and recovered heat from the exhaust gas released from an afterburner. In addition, it is found that a regulation of the flow rate of biomass to the gasifier and afterburner is a key parameter in the PEMFC-based system to achieve the system requirement when the power-to-heat ratio is changed. The result indicates that the power-to-heat ratio of the designed system varies from 0.06 to 0.75. Copyright © 2015, AIDIC Servizi S.r.l.

关键词： Waste heat

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Performance analysis of the solid oxide fuel cell and oxyfuel combustion integrated system with different recycling methods

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Chemical engineering Transactions 2015年 45卷 1045-1050页

作者： Simasatitkul, Lida Mahisanan, Chanon Arpornwichanop, Amornchai Computational Process Engineering Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand

ISBN: (纸本)9788895608365

A solid oxide fuel cell (SOFC) has been regarded as the future power generation due to its high efficiency and environmental friendliness. In general, hydrogen used as a fuel in SOFC is produced from hydrocarbon fuel processing that releases carbon dioxide (CO2). Thus, a SOFC power plant requires a CO2-capture process. Among the various types of CO2 separation, the oxyfuel combustion is an interesting approach due to its capability of total CO2 capture with low energy consumption. In this study, the SOFC and oxyfuel combustion integrated system is investigated. To improve its performance, the integrated SOFC system with different recycling schemes: SOFC anode outlet stream (anode recycling) and water condensate stream (steam recycling), is proposed. Pameteric analysis of key design parameters in the SOFC system is performed by considering electricity and heat generation. The simulation results show that the SOFC system with anode recycling provides better electrical efficiency than that with steam recycling due to high utilization of fuel in SOFC and capability of integrating a fuel turbine in the SOFC system. For the SOFC with steam recycling, the fuel turbine cannot be implemented due to insufficient heat for preheating inlet streams. Copyright © 2015, AIDIC Servizi S.r.l.,.

关键词： Carbon dioxide

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Theoretical analysis of the wall deposition of particles in spray dryers

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Chemical engineering Transactions 2014年第SPECIAL ISSUE期39卷 571-576页

作者： Patniboon, Artitaya Ponpesh, Pimporn Soottitantawat, Apinan Arpornwichanop, Amornchai Computational Process Engineering Research Unit Department of Chemical Engineering Chulalongkorn University Bangkok10330 Thailand

ISBN: (纸本)9788895608303

A spray drying is an important process in food, healthcare and pharmaceutical industries. However, spray dryers normally face a difficulty in operation when some particles with high moisture content (stickiness) have collected contacts with the metal surface of a dryer chamber, which is called a wall deposition problem. In this study, a computational fluid dynamic model of the spray dryer is developed based on momentum, mass and heat equations of the fluid and solid phases and employed to analyze an effect of the addition of a drying agent material on the fluid flow pattern within the spray dryer and the percentage and position of particle deposition. The wall deposition of particles is predicted by considering glass transition temperatures using the sticky-point concept. The feed solution of anthocyanin using maltodextrins as the drying agent material is considered. The simulation results indicate that most particles are deposited on the conical wall more than cylindrical wall. Use of maltodextrin with a higher dextrose equivalent (DE) value lowers the glass transition temperature of particle, causing the particles attached on the wall. Copyright © 2014, AIDIC Servizi S.r.l.

关键词： Glass

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Exergoenvironmental analysis of heat recovery from solid oxide fuel cell system for cooling applications

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Chemical engineering Transactions 2015年 43卷 2203-2208页

作者： Tippawan, Phanicha Arpornwichanop, Amornchai Dincer, Ibrahim Computational Process Engineering Research Unit Department of Chemical Engineering Facuity of Engineering Chulalongkorn University Bangkok10330 Thailand OntarioeL1H 7K4 Canada

ISBN: (纸本)9788895608341

A recovery of high-quality by-product heat from a solid oxide fuel cell (SOFC) for steam production appears to be an interesting alternative to improve the SOFC performance. The produced steam can be used for chilled water generation via an absorption chiller. However, the main challenge in designing this combined cycle is the proper use of the SOFC exhaust gas in order to optimize the chilled water generation. Exergy analysis plays an important role in developing strategies and in providing guidelines for more effective use of exhaust heat in existing systems. In this study, a combined analysis of exergy and environmental impact (through greenhouse gas emissions) of the chilled water production process using the SOFC exhaust heat are performed under exergoenvironmental analysis. The study determines energy and exergy efficiencies, exergy destructions and CO2 emissions as well as sustainability indexes (SI). Copyright © 2015, AIDIC Servizi S.r.l.

关键词： Exergy

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Systematic design and analysis of biomass refineries for power generation

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Chemical engineering Transactions 2015年 45卷 205-210页

作者： Simasatitkul, Lida Arpornwichanop, Amornchai Department of Industrial Chemistry Faculty of Applied Science King Mongkut's University of Technology North Bangkok Thailand Computational Process Engineering Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Thailand

ISBN: (纸本)9788895608365

The depleted conventional fossil fuels coupled with an increase in price and demand of fossil fuel is regarded as a major problem for an industrial sector. Searching for renewable resources to produce alternative fuels becomes important. Biomass is a promising alternative resource for biofuel production from existing, well-developed technologies, such as gasification, anaerobic digestion of biomass and reforming processes. This study focuses on the development of a systematic design approach for the biomass refinery process to generate power using SOFC systems. Multi-objective evaluation is considered to determine the optimal process in terms of economic, efficiency and environment. Anaerobic digestion integrated with SOFC gives the best process in terms of efficiency with annual worth minimization. Based on multiple criteria consideration, the anaerobic digestion integrated with SOFC is also a sustainable process that provides the highest value by using analytical hierarchy method. Copyright © 2015, AIDIC Servizi S.r.l.,.

关键词： Biomass

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Design of the integrated solid oxide fuel cell and molten carbonate fuel cell system to reduce carbon dioxide emissions

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Chemical engineering Transactions 2015年 43卷 2191-2196页

作者： Jienkulsawad, Prathak Saebea, Dang Patcharavorachot, Yaneeporn Arpornwichanop, Amornchai Computational Process Control Research Unit Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Department of Chemical Engineering Faculty of Engineering Burapha University Chonburi20131 Thailand School of Chemical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok10520 Thailand

ISBN: (纸本)9788895608341

In general, a solid oxide fuel cell (SOFC) based on an internal reforming operation cannot be run with complete fuel utilization;therefore, the remaining fuel needs to be effectively handled. Furthermore, the SOFC exhaust gas still contains carbon dioxide, which is the primary greenhouse gas, and searching for the way to utilize this carbon dioxide is important. A molten carbonate fuel cell (MCFC) appears to be a potential technology to mitigate the emissions of carbon dioxide. In this study, the performance of the integrated SOFC and MCFC system is analyzed. The SOFC is considered a main power generation and the MCFC is regarded as a carbon dioxide concentrator along with producing electricity as a by-product. Mathematical models of the SOFC and MCFC are based on one-dimensional mass balances taking into all various cell voltage losses under steady-state and isothermal conditions. Primary operating conditions of the integrated fuel cell system that affects the system efficiencies in terms of power generation and reduction in the carbon dioxide emission are discussed and its optimal operation is identified based on these criteria. Effect of carbon dioxide recirculation on the system is also studied. Various configurations of the integrated SOFC-MCFC system are proposed and compared to determine the suitable design of the integrated fuel cell system. Copyright © 2015, AIDIC Servizi S.r.l.

关键词： Carbon dioxide

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