Publication: Design and Control of Proton Exchange Membrane Fuel Cell Systems
| dc.contributor | Jeffrey D. Ward | zh-TW |
| dc.contributor | 臺灣大學:化學工程學研究所 | zh-TW |
| dc.contributor.author | Hung, Ai-Jen | en |
| dc.creator | Hung, Ai-Jen | en |
| dc.date | 2009 | en |
| dc.date.accessioned | 2010-06-30T06:21:58Z | |
| dc.date.accessioned | 2018-06-28T17:16:46Z | |
| dc.date.available | 2010-06-30T06:21:58Z | |
| dc.date.available | 2018-06-28T17:16:46Z | |
| dc.date.issued | 2009 | |
| dc.description.abstract | The depletion of fossil fuel has lead to renewed interest in fuel cell systems. The last decade has seen significant progress in power generation using fuel cell systems. It is well known that power generation using hydrogen as fuel involves three important issues: Hydrogen generation, Hydrogen storage, and Power generation. The objective of this work is to emphasize systematic approaches to the modeling, design, and control of fuel cell systems. At the modeling stage, a first principles model of a fuel cell is constructed and model parameters are identified via regression from the experimental data (provided by ITRI). Next, sensitivity of dominant process variables to design and operating efficiency is examined. This facilitates locating the optimal operating condition as well as improved design. Finally, a control system is designed to ensure operating flexibility as well as good disturbance rejection. The model of an experimental proton exchange membrane fuel cell for power generation is developed for process design and optimization. An analytical cost model is constructed to describe such an economic tradeoff between capital cost (membrane electrode assembly area) and operating cost (hydrogen fuel) in a proton exchange membrane fuel cell system. At the process level, the kinetics development, modeling and control of a hydrogen storage process (using sodium borohydride) is investigated. | en |
| dc.description.tableofcontents | 致謝 Ibstract III要 Vist of Figures XIist of Tables XV Introduction 1.1 Hydrogen generation system using sodium borohydride hydrolysis reaction 1.2 Proton exchange membrane fuel cell 3.3 Dissertation organization 6 Kinetics of a sodium borohydride hydrolysis reaction for a hydrogen generation system 8.1 Overview 8.2 Hydrolysis reaction 12.3 Results and discussion 13.3.1 Kinetics 13.3.1.1 Data treatment 13.3.1.2 Zero-order 17.3.1.3 First-order 23.3.1.4 Langmuir-Hinshelwood 25.3.2 Batch reactor model 28.3.3 Validation of the kinetic model 29.4 Conclusions 30 Design and control of a sodium borohydride hydrolysis reaction for a hydrogen generation system 33.1 Overview 33.2 Process description 34.3 Steady-state model of a hydrogen generation reactor 34.3.1 Model assumptions 35.3.2 Modeling equations 35.3.3 Process constraints: Solubility of NaBH4 and NaBO2 in water 37.3.4 Simulation result 38.4 Results and discussion 39.4.1 Sensitivity analysis 39.4.1.1 Effect of feed ratio (FR) 42.4.1.2 Effect of inlet temperature (Tin) 44.4.1.3 Effect of total pressure in the reactor (Pt) 45.4.2 Optimization of operating variables 46.5 Dynamic model of a hydrogen generation reactor 49.5.1 Model assumptions 49.5.2 Dynamic modeling equations 49.6 Control structure design 51.6.1 On-supply control structure 52.6.2 On-demand control structure 53.6.3 Dynamic results 53.7 Conclusions 60 Operation-relevant modeling of an experimental proton exchange membrane fuel cell 63.1 Overview 63.2 Steady-state model of a PEM fuel cell 64.2.1 Model assumptions 64.2.2 Modeling equations 65.2.3 Equation solving procedure 70.3 Results and discussion 71.3.1 Regression and validation 71.3.2 Sensitivity analysis 77.3.2.1 The fuel cell temperature 79.3.2.2 The anode and cathode pressures 80.3.2.3 The stoichiometric ratios of the reactants 81.3.2.4 The humidification temperatures of the reactants at the anode and cathode 81.3.2.5 Summary 82.3.3 Nonlinearity 84.4 Conclusions 86 Cost analysis of proton exchange membrane fuel cell systems 89.1 Overview 89.2 PEM fuel cell system 90.2.1 Operating components in hydrogen-air PEM fuel cell systems 90.2.2 System efficiency 90.3 Economic analysis of PEM fuel cell systems 94.3.1 Linear approximation of a polarization curve 94.3.2 Nondimensionalization 96.3.3 Relationship between MEA area and hydrogen flow rate 97.4 Cost model 101.4.1 Total annual cost (TAC) 101.4.2 Capital cost 104.4.3 Operating cost 106.4.4 Analytical expression of total annual cost (TAC) 107.4.5 Simplified system efficiency 109.4.6 Analytical expressions for TAC optimal design with numbering up (n=1) 110.5 Analysis and discussions 112.5.1 Cost factors: prices of MEA (and bipolar plate) and hydrogen 112.5.2 Reliability factor (life-cycle) for the MEA 114.5.3 Material factors for the MEA 115.5.4 Cost factors in the future 117.5.5 Two methods of varying the MEA area to achieve the same desired power output 119.6 Conclusions 119 Conclusions 124ppendix A 128ppendix B 133ppendix C 134ppendix D 138eferences 140utobiography 150 | en |
| dc.format.extent | 1459136 bytes | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.other | U0001-1908200915560500 | en |
| dc.identifier.uri | http://ntur.lib.ntu.edu.tw//handle/246246/186962 | |
| dc.identifier.uri.fulltext | http://ntur.lib.ntu.edu.tw/bitstream/246246/186962/1/ntu-98-D94524019-1.pdf | |
| dc.language | en | en |
| dc.language.iso | en_US | |
| dc.subject | hydrogen storage | en |
| dc.subject | proton exchange membrane fuel cell | en |
| dc.subject | process design | en |
| dc.subject | modeling | en |
| dc.subject | efficiency | en |
| dc.subject | control | en |
| dc.title | Design and Control of Proton Exchange Membrane Fuel Cell Systems | en |
| dc.type | thesis | en |
| dspace.entity.type | Publication |
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