| 摘要: | 本研究建立中溫質子傳導型固態氧化物燃料電池，利用Matlab搭配電化學模型計算燃料電池不同溫度下性能曲線，並應用商用軟體Simulink/Thermolib模擬不同系統配置各元件熱力學性質變化情形。本文系統入口端燃料有別於固態氧化物燃料電池常見的天然氣，以合成氣體取代之，同時利用產甲醇達到減碳之目的。本文一共有四個系統，其中系統A~C為產甲醇為主之系統，系統D為發電為主之系統。而操作變因為燃料當量比、Ratio數值(供應給燃料電池之比例)、水氣比例。
由於不同原料燃燒產生之合成氣體組成百分比不同，本研究將分成低氫氣型(40%H260%CO)與高氫氣型(80%H2+20%CO)並分成三大部分討論，(1)甲醇為主系統、(2)發電為主系統、(3)放大燃料電池發電量。
第一部分結果顯示，藉由適當氫氣分配搭配水煤氣轉化反應
器(Water Gas Shifting reactor)能提升系統效率，低氫氣型與高氫氣型分別提升21%和6%，同樣地，由於甲醇產量提升，低氫氣型與高氫氣型減碳率也分別提升15%和26%。第二部分結果顯示，將產甲醇為主系統中相同的燃料量，若改成完全發電之系統，低氫氣型與高氫氣型系統效率分別下降30%和23%。第三部分結果顯示，將燃料電池發電量由1 MW放大至100 MW，不管是低氫氣型或高氫氣型，系統效率都分別維持在57%和70%。
;In this study, an intermediate-temperature proton-conducting solid oxide fuel cell is established. The electrochemical models were computed for fuel cell using Matlab. Also, The thermodynamic properties of different configurations were studied by Simulink/Thermolib software. In this thesis, the possibility of replacing nature gas with syngas for SOFC is explained. Methanol production can reduce the carbon release to atmosphere. There are four systems which system A~C are methanol-based and system D is power-based in this study. The operating parameters are fuel stoichiometric、ratio(supply to fuel cell)、steam ratio.
The composition of syngas varies with amount of the fuel used for combustion. So, the composition of the hydrogen in fuel is varied from low (40%H260%CO) to high (80%H2+20%CO). Study is performed by considering three parts: (1) methanol-based system (2) power-based system (3) enlarging the fuel cell power output.
Firstly, in System C, the fuel is passed through the water gas shifting reaction and the efficiency of fuel cell increases by 6% and 21% for low and high concentrations of hydrogen in fuel, when compared to system A. Along with the methanol production, reduction of carbon in reaction also increases by 15 % and 26%, respectively, for low and high concentration of hydrogen in fuel. Secondly, The same fuel flowrate maintained in system C is also considered for system D, the efficiency of the system is decreased by 30% and 23%, respectively, for low and high concentration of hydrogen in fuel, when compared to system C. Finally, the above simulations were performed for the fuel cell having an output of 1MW power. It is depicted from simulations that system C shows better efficiency compared to the other systems. So, system C is chosen for 100 MW power generation simulations. Finally, the efficiency of system C for 100 MW power generation is 57% and 70%, respectively, for low and high concentrations of hydrogen in fuel. |
