磷酸燃料电池-吸收式制冷机混合系统性能分析与生态学优化
发布时间：2018-11-25 16:49
【摘要】：本论文在综合考虑了磷酸燃料电池工作的过程中存在的不可逆性,建立了磷酸燃料电池的数学模型,对磷酸燃料电池(PAFC)进行电化学以及热力学分析优化,研究几个重要的工作参数对其工作性能有怎样的影响,包括温度、压力、磷酸电解质的摩尔分数等。为了有效并且合理地回收利用磷酸燃料电池工作过程中产生的废热,本论文进而建立了磷酸燃料电池-吸收式制冷机混合系统的数学模型,利用吸收式制冷机来有效回收磷酸燃料电池在发电过程中产生的废热,研究结果显示混合系统的最大输出功率和最大输出效率分别比磷酸燃料电池提高了3.41%和4.04%,并且得到了混合系统输出功率的最佳运行区间是8)(6,混合系统输出效率的最佳运行区间为8)(6。我们在已经建立的磷酸燃料电池-吸收式制冷机混合系统的基础上,详细分析了混合系统的各种不可逆因素,得出了混合系统的熵产率的理论计算公式,运用生态学优化的原理对混合系统进行了优化分析。通过以上科研工作,我们收获了一些具有理论意义以及实际意义的结论。本文主要研究内容如下:第一章简要介绍了燃料电池和吸收式制冷机相关的研究背景和发展历史。第二章建立了相对完整的磷酸燃料电池的数学模型,运用热力学和电化学分析的方法,研究三种过电势对磷酸燃料电池的性能所造成的影响,得到几个主要参数的理论计算公式;运用理论分析和数值计算的方法来研究几个主要的工作条件和参数,如温度、压力、磷酸摩尔分数和电解质厚度等工作参数对磷酸燃料电池性能有何影响,得出了磷酸燃料电池的相关工作参数或工作条件的优化取值范围。第三章建立了一个工作在稳定的状态的磷酸燃料电池-吸收式制冷机的混合系统的数学理论模型,在该数学模型里,我们综合地考虑了电化学反应、回热以及耗散到环境中的热漏等不可逆损失。在研究中通过理论分析和数值模拟的方法研究温度、压力、电解质厚度、制冷温度、环境温度和不可逆系数等对混合系统工作性能的影响,得到了混合系统工作参数取值的优化范围,通过研究混合系统输出电压与效率的关系,得到了两者的优化区间。第四章在已经建立的磷酸燃料电池-吸收式制冷机混合系统的数学模型的基础上研究了混合系统中可能存在的各种不可逆损失,得出了混合系统的熵产率的理论计算公式,运用生态学优化的原理对磷酸燃料电池-吸收式制冷机的混合系统进行了优化分析,折衷了混合系统的熵增性能与混合系统的输出功率性能和混合系统的输出效率性能的关系。分别以生态学准则函数(E)和生态学性能系数(ECOP)为目标函数进行了理论数值分析,最终得出了相关工作参数的优化取值区间。第五章,简要概括了本论文的主要研究内容以及所得到的结论,然后分析了本论文存在的不足之处和创新之处,并对本课题今后的研究方向提出了设想与展望。
[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.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：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.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB651
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