磷酸燃料電池-吸收式制冷機(jī)混合系統(tǒng)性能分析與生態(tài)學(xué)優(yōu)化
發(fā)布時(shí)間：2018-11-25 16:49
【摘要】：本論文在綜合考慮了磷酸燃料電池工作的過(guò)程中存在的不可逆性,建立了磷酸燃料電池的數(shù)學(xué)模型,對(duì)磷酸燃料電池(PAFC)進(jìn)行電化學(xué)以及熱力學(xué)分析優(yōu)化,研究幾個(gè)重要的工作參數(shù)對(duì)其工作性能有怎樣的影響,包括溫度、壓力、磷酸電解質(zhì)的摩爾分?jǐn)?shù)等。為了有效并且合理地回收利用磷酸燃料電池工作過(guò)程中產(chǎn)生的廢熱,本論文進(jìn)而建立了磷酸燃料電池-吸收式制冷機(jī)混合系統(tǒng)的數(shù)學(xué)模型,利用吸收式制冷機(jī)來(lái)有效回收磷酸燃料電池在發(fā)電過(guò)程中產(chǎn)生的廢熱,研究結(jié)果顯示混合系統(tǒng)的最大輸出功率和最大輸出效率分別比磷酸燃料電池提高了3.41%和4.04%,并且得到了混合系統(tǒng)輸出功率的最佳運(yùn)行區(qū)間是8)(6,混合系統(tǒng)輸出效率的最佳運(yùn)行區(qū)間為8)(6。我們?cè)谝呀?jīng)建立的磷酸燃料電池-吸收式制冷機(jī)混合系統(tǒng)的基礎(chǔ)上,詳細(xì)分析了混合系統(tǒng)的各種不可逆因素,得出了混合系統(tǒng)的熵產(chǎn)率的理論計(jì)算公式,運(yùn)用生態(tài)學(xué)優(yōu)化的原理對(duì)混合系統(tǒng)進(jìn)行了優(yōu)化分析。通過(guò)以上科研工作,我們收獲了一些具有理論意義以及實(shí)際意義的結(jié)論。本文主要研究?jī)?nèi)容如下:第一章簡(jiǎn)要介紹了燃料電池和吸收式制冷機(jī)相關(guān)的研究背景和發(fā)展歷史。第二章建立了相對(duì)完整的磷酸燃料電池的數(shù)學(xué)模型,運(yùn)用熱力學(xué)和電化學(xué)分析的方法,研究三種過(guò)電勢(shì)對(duì)磷酸燃料電池的性能所造成的影響,得到幾個(gè)主要參數(shù)的理論計(jì)算公式;運(yùn)用理論分析和數(shù)值計(jì)算的方法來(lái)研究幾個(gè)主要的工作條件和參數(shù),如溫度、壓力、磷酸摩爾分?jǐn)?shù)和電解質(zhì)厚度等工作參數(shù)對(duì)磷酸燃料電池性能有何影響,得出了磷酸燃料電池的相關(guān)工作參數(shù)或工作條件的優(yōu)化取值范圍。第三章建立了一個(gè)工作在穩(wěn)定的狀態(tài)的磷酸燃料電池-吸收式制冷機(jī)的混合系統(tǒng)的數(shù)學(xué)理論模型,在該數(shù)學(xué)模型里,我們綜合地考慮了電化學(xué)反應(yīng)、回?zé)嵋约昂纳⒌江h(huán)境中的熱漏等不可逆損失。在研究中通過(guò)理論分析和數(shù)值模擬的方法研究溫度、壓力、電解質(zhì)厚度、制冷溫度、環(huán)境溫度和不可逆系數(shù)等對(duì)混合系統(tǒng)工作性能的影響,得到了混合系統(tǒng)工作參數(shù)取值的優(yōu)化范圍,通過(guò)研究混合系統(tǒng)輸出電壓與效率的關(guān)系,得到了兩者的優(yōu)化區(qū)間。第四章在已經(jīng)建立的磷酸燃料電池-吸收式制冷機(jī)混合系統(tǒng)的數(shù)學(xué)模型的基礎(chǔ)上研究了混合系統(tǒng)中可能存在的各種不可逆損失,得出了混合系統(tǒng)的熵產(chǎn)率的理論計(jì)算公式,運(yùn)用生態(tài)學(xué)優(yōu)化的原理對(duì)磷酸燃料電池-吸收式制冷機(jī)的混合系統(tǒng)進(jìn)行了優(yōu)化分析,折衷了混合系統(tǒng)的熵增性能與混合系統(tǒng)的輸出功率性能和混合系統(tǒng)的輸出效率性能的關(guān)系。分別以生態(tài)學(xué)準(zhǔn)則函數(shù)(E)和生態(tài)學(xué)性能系數(shù)(ECOP)為目標(biāo)函數(shù)進(jìn)行了理論數(shù)值分析,最終得出了相關(guān)工作參數(shù)的優(yōu)化取值區(qū)間。第五章,簡(jiǎn)要概括了本論文的主要研究?jī)?nèi)容以及所得到的結(jié)論,然后分析了本論文存在的不足之處和創(chuàng)新之處,并對(duì)本課題今后的研究方向提出了設(shè)想與展望。
[Abstract]:In this paper, a mathematical model of the phosphoric acid fuel cell is established, and the electrochemical and thermodynamic analysis of the phosphoric acid fuel cell (PAFC) is optimized. The influence of several important working parameters on its working performance is studied, including the temperature, pressure, the mole fraction of the phosphoric acid electrolyte, etc. in order to effectively and reasonably recover the waste heat generated during the operation of the phosphoric acid fuel cell, the paper further establishes a mathematical model of a phosphoric acid fuel cell-absorption type refrigerator mixing system, The results show that the maximum output power and the maximum output efficiency of the hybrid system are compared with that of the phosphoric acid fuel cell by 3.41% and 4.04%, respectively. and the optimal operation interval of the output power of the hybrid system is 8) (6, the optimal operation interval of the output efficiency of the hybrid system is 8) (6. On the basis of the hybrid system of the phosphoric acid fuel cell-absorption type refrigerator, we have analyzed the various irreversible factors of the hybrid system, and the theoretical calculation formula of the entropy production rate of the hybrid system is obtained, and the optimal analysis of the hybrid system is carried out by using the principle of ecology optimization. Through the scientific research above, we have gained some theoretical and practical conclusions. The main contents of this paper are as follows: The first chapter briefly introduces the research background and development history of the fuel cell and the absorption type refrigerator. In the second chapter, the mathematical model of a relatively complete phosphoric acid fuel cell is established, and the influence of three over-potential on the performance of the phosphoric acid fuel cell is studied by using the method of thermodynamics and electrochemical analysis, and the theoretical calculation formula of several main parameters is obtained. The main working conditions and parameters, such as temperature, pressure, mole fraction of phosphoric acid and electrolyte thickness, have been studied by the method of theoretical analysis and numerical calculation, and the effect of the working parameters such as temperature, pressure, phosphoric acid mole fraction and electrolyte thickness on the performance of the phosphoric acid fuel cell is studied. The optimum value range of the relevant working parameters or working conditions of the phosphoric acid fuel cell is obtained. The third chapter establishes a mathematical model of the hybrid system of a phosphoric acid fuel cell-absorption type refrigerator working in a stable state. In this mathematical model, we take into account the irreversible loss of the electrochemical reaction, the return heat and the heat leakage in the environment. The influence of temperature, pressure, electrolyte thickness, refrigeration temperature, ambient temperature and irreversible coefficient on the working performance of the hybrid system was studied by means of theoretical analysis and numerical simulation in the study, and the optimum range of the working parameters of the mixing system was obtained. By studying the relation between the output voltage and the efficiency of the hybrid system, the optimization interval of the two systems is obtained. In the fourth chapter, on the basis of the established mathematical model of the phosphoric acid fuel cell-absorption type refrigeration system, various irreversible losses in the mixing system are studied, and the theoretical calculation formula of the entropy production rate of the mixing system is obtained. The hybrid system of the phosphoric acid fuel cell-absorption type refrigerator is optimized and analyzed by using the principle of ecology optimization, and the relationship between the entropy increase performance of the hybrid system and the output power performance of the hybrid system and the output efficiency performance of the hybrid system is compromised. The objective function of the ecological criterion function (E) and the ecological performance coefficient (ECOP) is analyzed, and the optimization value interval of the relevant working parameters is finally obtained. In the fifth chapter, the main contents and conclusions of this thesis are briefly summarized, then the shortcomings and innovations in this paper are analyzed, and the future research direction of this thesis is put forward.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TB651
[Abstract]:In this paper, a mathematical model of the phosphoric acid fuel cell is established, and the electrochemical and thermodynamic analysis of the phosphoric acid fuel cell (PAFC) is optimized. The influence of several important working parameters on its working performance is studied, including the temperature, pressure, the mole fraction of the phosphoric acid electrolyte, etc. in order to effectively and reasonably recover the waste heat generated during the operation of the phosphoric acid fuel cell, the paper further establishes a mathematical model of a phosphoric acid fuel cell-absorption type refrigerator mixing system, The results show that the maximum output power and the maximum output efficiency of the hybrid system are compared with that of the phosphoric acid fuel cell by 3.41% and 4.04%, respectively. and the optimal operation interval of the output power of the hybrid system is 8) (6, the optimal operation interval of the output efficiency of the hybrid system is 8) (6. On the basis of the hybrid system of the phosphoric acid fuel cell-absorption type refrigerator, we have analyzed the various irreversible factors of the hybrid system, and the theoretical calculation formula of the entropy production rate of the hybrid system is obtained, and the optimal analysis of the hybrid system is carried out by using the principle of ecology optimization. Through the scientific research above, we have gained some theoretical and practical conclusions. The main contents of this paper are as follows: The first chapter briefly introduces the research background and development history of the fuel cell and the absorption type refrigerator. In the second chapter, the mathematical model of a relatively complete phosphoric acid fuel cell is established, and the influence of three over-potential on the performance of the phosphoric acid fuel cell is studied by using the method of thermodynamics and electrochemical analysis, and the theoretical calculation formula of several main parameters is obtained. The main working conditions and parameters, such as temperature, pressure, mole fraction of phosphoric acid and electrolyte thickness, have been studied by the method of theoretical analysis and numerical calculation, and the effect of the working parameters such as temperature, pressure, phosphoric acid mole fraction and electrolyte thickness on the performance of the phosphoric acid fuel cell is studied. The optimum value range of the relevant working parameters or working conditions of the phosphoric acid fuel cell is obtained. The third chapter establishes a mathematical model of the hybrid system of a phosphoric acid fuel cell-absorption type refrigerator working in a stable state. In this mathematical model, we take into account the irreversible loss of the electrochemical reaction, the return heat and the heat leakage in the environment. The influence of temperature, pressure, electrolyte thickness, refrigeration temperature, ambient temperature and irreversible coefficient on the working performance of the hybrid system was studied by means of theoretical analysis and numerical simulation in the study, and the optimum range of the working parameters of the mixing system was obtained. By studying the relation between the output voltage and the efficiency of the hybrid system, the optimization interval of the two systems is obtained. In the fourth chapter, on the basis of the established mathematical model of the phosphoric acid fuel cell-absorption type refrigeration system, various irreversible losses in the mixing system are studied, and the theoretical calculation formula of the entropy production rate of the mixing system is obtained. The hybrid system of the phosphoric acid fuel cell-absorption type refrigerator is optimized and analyzed by using the principle of ecology optimization, and the relationship between the entropy increase performance of the hybrid system and the output power performance of the hybrid system and the output efficiency performance of the hybrid system is compromised. The objective function of the ecological criterion function (E) and the ecological performance coefficient (ECOP) is analyzed, and the optimization value interval of the relevant working parameters is finally obtained. In the fifth chapter, the main contents and conclusions of this thesis are briefly summarized, then the shortcomings and innovations in this paper are analyzed, and the future research direction of this thesis is put forward.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TB651
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