Performance characteristic modeling of hybrid proton conducting solid oxide fuel cell (pSOFC) and micro gas turbine (MGT) system using a double bypass valve for heat management

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論文名稱

Performance characteristic modeling of hybrid proton conducting solid oxide fuel cell (pSOFC) and micro gas turbine (MGT) system using a double bypass valve for heat management
(Performance characteristic modeling of hybrid proton conducting solid oxide fuel cell (pSOFC) and micro gas turbine (MGT) system using a double bypass valve for heat management)

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摘要(中)

摘要
質子傳導型固態氧化物燃料電池(pSOFC)搭配微型渦輪機(MGT)是現今常見的複合系統。此電廠系統藉由中溫型pSOFC(大約700-800oC)溫度去提升微型渦輪機的性能，相較於傳統的SOFC，pSOFC操作溫度較低且有著快速開啟/關閉和較佳的耐久度特性，本文將根據先前研究者的模組去研發新的模組，同時，藉由Matlab-Simulink模擬此複合系統，利用改變參數，例如壓力、水碳比和燃料當量比，模擬此pSOFC-MGT複合系統的行為，本文也提出三個系統配置，將分流管放置於(i)燃燒室之後、(ii)渦輪機之後、(iii)燃燒室與渦輪機之後。

結果顯示配置1和2隨操作壓力越高，系統效率越低；配置3則是隨操作壓力越高，系統效率越低。水碳比影響部分，配置1在操作壓力是1-2(bar)時，提高水碳比會降低效率，而配置2與配置3則是提高效率。燃料當量比部分，所有配置都會隨燃料當量增加，系統效率同樣增加。分流率改變部分，所有配置都會隨分流率增加而系統效率增加。若考慮所有的結果，配置3比起配置1和配置2擁有較佳的性能。配置1、配置2和配置3的系統效率分別為48.93%、62.63%和67.79%。研究發現在配置3中，若熱交換器之熱交換速率大於5 W/K，探討的參數影響性將大幅下降。藉由成本分析並選取適當系統裝置來建立配置3。與能量分析相比，有用能分析也有相同趨勢，但數值不相同。因為過程中有用能會有損耗，因此，能量的數值會比有用能來的高，為了瞭解有用能損耗，我們利用熵的增加來計算，將系統中裝置依有用能損失由高到低排列依序為燃燒室60.235[kW]、pSOFC 22.773[kW]、壓縮機21.706[kW]、幫浦5.535[kW]、燃料熱交換器0.886[kW]、重組器0.681[kW]、水熱交換器0.345[kW]、空氣熱交換器0.225[kW]和微型渦輪機0.21[kW]。

關鍵字:質子傳導型固態氧化物燃料電池(pSOFC)、微型渦輪機(MGT)、Matlab-Simulink、複合配置

摘要(英)

Abstract
Conducting Proton-Solid Oxide Fuel Cell (pSOFC), by attaching Micro Gas Turbine (MGT) is oneof the outstanding hybrid system nowadays. The intermediate temperature of pSOFC (around 700 – 800 [0C])is used to raise the performance of micro gas turbine in apower plantsystem. pSOFC has a lower temperature characteristic than old type of SOFC, which can afford more rapid start up/down and improve durability. A new model is proposed in the research based on themodels developed by earlier researchers.The proposed hybrid system is simulated using Matlab-Simulink. Simulations were performed to study the behavior of the pSOFC-MGT hybrid system by changing respective parameters such as pressure, steam to carbon ratio, and fuel utilization.In our research, we proposed, three different configurations by changing the bypass position in my proposed system i.e., with placing the bypass(i) after the combustor, (ii) after turbine, and (iii) after the combustor and turbine.

The results show that the higher operating pressure will reduce system efficiency for configuration 1 and 2, and increase the efficiency for configuration 3. The effect of raising Steam to Carbon Ratio will reduce the efficiency of configuration 1 for anoperating pressure of 1 – 2 [bar], but it increasesthe efficiency of configuration 2 and configuration 3. The higherfuel utilization will increase the efficiency for all configurations. For bypass ratio variation, increase in bypass ratio will increase the efficiency of all configurations. Considering all the results ofconfiguration 3 provide the best performance compared to configuration 1 and 2 in all three models. The efficiencies of configuration 1, configuration 2, and configuration 3 are 49%, 63%, and68% respectively. The study obtained that using the overall heat exchanger over 5 W/K will not give an effect to configuration 3 performance so much. The cost analysis can be taken into consideration bychoosing an appropriate device to build a configuration 3 model. The exergy analysis has a same tendency with energy analysis, but it will different in value. Due to the exergy destruction during the process, the value of energy is higher than exergy. To know an amount of exergy destruction, it carried out thecalculations based on the amount of entropy generation and found the devices that have lost exergy from the largest to the smallest in a sequence is combustor 60.2[kW], pSOFC 22.8 [kW] Compressor 21.7 [kW], Pump 5.5 [kW], Fuel Heater 0.9 [kW], reformer 0.7 [kW], water heater 0.4 [kW], air heater 0.23 [kW], and MGT 0.21 [kW].

Keywords: Proton-Conducting Solid Oxide Fuel Cell (pSOFC), Micro Gas Turbine (MGT), Matlab-Simulink, Hybrid configuration mode

論文目次

Contents
Abstract i
Acknowledgements ii
Contents iii
List of Tables vi
List of Figures vii
Nomenclature xii
Chapter 1 Introduction 1
1.1 Backgrounds 1
1.2 References Review 5
1.3 Motivation 6
Chapter 2 Literature Review and Modeling 8
2.1. Proton Solid Oxide Fuel Cell 8
2.1.1. Anode 10
2.1.2. Cathode 11
2.1.3. Electrolyte 12
2.1.4. Interconnect 12
2.1.5. Seals 14
2.1.6. Electrical Model 14
2.1.6.1. Activation Overpotential Losses 16
2.1.6.2. Ohmic Overpotential Losses 18
2.1.6.3. Concentration Overpotential Losses 18
2.2. Micro Gas Turbine 20
2.3. Compressor 20
2.4. Heat Exchanger 21
2.5. Combustor 24
2.6. Mixer 24
2.7. Reformer 25
2.8. Balance of Plant 25
2.9. Fuel Utilization (Uf) 26
2.10. Steam to Carbon Ratio (S/C) 27
2.11. The Cost Study 27
2.12. The Exergy Study 29
Chapter 3 Methodology 33
3.1. Modelling Assumptions and Operating Conditions 33
3.2. The Configurations Model 34
3.2.1. Configuration 1 34
3.2.2. Configuration 2 35
3.2.3. Configuration 3 37
Chapter 4 Results and Discussion 40
4.1 Effect of Operating Parameter 40
4.1.1. Effect of Hybrid System Operating Pressure 40
4.1.1.1. Configuration 1 40
4.1.1.2. Configuration 2 46
4.1.1.3. Configuration 3 50
4.1.2. Effect of pSOFC Fuel Utilization (Uf) 54
4.1.2.1. Configuration 1 55
4.1.2.2. Configuration 2 59
4.1.2.3. Configuration 3 63
4.1.3. Effect of pSOFC Steam to Carbon Ratio (S/C) 67
4.1.3.1. Configuration 1 67
4.1.3.2. Configuration 2 72
4.1.3.3. Configuration 3 76
4.1.4. Effect of pSOFC Bypass Ratio 80
4.1.4.1. Configuration 1 81
4.1.4.2. Configuration 2 85
4.1.4.3. Configuration 3 89
4.2 Configuration Selection 93
4.3 The Detail Analysis of Choosen Model Configuration 94
4.3.1. The Sensitivity Study of The Configuration 3 94
4.3.2. The Cost Model Analysis 96
4.3.3. The Exergy Model Analysis 100
Chapter 5 Conclusions and Suggestion 107
5.1. Conclusion 107
5.2. Suggestions 108
References
Attachment

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指導教授

曾重仁

審核日期

2016-1-26

推文