MFC电池电极邻近区域基质浓度与温度实时测量研究

发布时间：2018-03-01 13:27

本文关键词： 光纤Bragg光栅(FBG) 微生物燃料电池温度和浓度腐蚀实时测量　出处：《重庆理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：微生物燃料电池(MFC)作为一种清洁新能源的生产技术,在产生新能源的同时,还能降解环境中的污水。在其生化反应过程中影响微生物产电性能的因素众多,如:微生物种类、电池结构、溶液酸碱性、基质浓度和温度等。在这些众多的影响因素中,基质的温度和浓度的影响尤其重要,因为这些参数具有分布不均、瞬时变动的特点,直接影响着微生物的生长状况,进而影响电池的产电性能。通过对该参数的实时测量,可以很好的了解微生物燃料电池的生化反应过程,对产电性能的提高具有重要的意义。本文采用一种腐蚀型光纤Bragg光栅(FBG)温度-浓度传感器对MFC电池电极界面基质温度和浓度进行实时测量,通过对温度和浓度同时测量的传感矩阵方程的数值分析,能够有效的解决测量中温度和浓度的交叉敏感的问题,得到精度较高的温度和浓度值。本文的研究主要内容包括以下几点:(1)设计并制作了两室型微生物燃料电池的反应装置。分析了影响电池产电性能的因素,成功运行的了微生物燃料电池,为后续的测量提供了实验基础。(2)通过对普通光纤Bragg光栅的理论分析,研究了腐蚀型光纤Bragg光栅反射谱与与外部介质折射率之间关系,得到了外部介质折射率的变化和光纤光栅传播模式下有效折射率的函数关系。(3)设计并制作了腐蚀型FBG温度-浓度传感器。通过分析传感器独特的结构,得到了敏感矩阵方程,通过实验数据分析,获得了具有温度补偿效果的较高灵敏度传感器。(4)设计并搭建了温度和浓度同时测量的实验系统。利用本文设计制作的腐蚀型FBG温度-浓度传感器通过对蔗糖溶液温度和浓度的同时测量,实验证明了,随着蔗糖溶液的浓度的增加,腐蚀型传感器的中心波长呈线性漂移,灵敏系数达到5.42nm/riu。(5)设计并搭建了微生物燃料电池同时测量基质温度和浓度的实验系统。通过对敏感矩阵中温度和折射率系数的标定,能够很好的对电池基质的温度和浓度进行实时测量。通过实验得到基质温度的变化和电压值的变化呈线正相关关系,而浓度呈不同程度的下降趋势。本文的研究工作可以为微生物燃料电池生化反应过程中微观机理研究提供很好的实验手段。同时对光纤光栅传感器向多参数测量、高灵敏感方向的发展具有一定的推动作用。
[Abstract]:Microbial fuel cell (MFC), as a clean and new energy production technology, can produce new energy and degrade the sewage in the environment at the same time. There are many factors that affect the electrical performance of microorganism during its biochemical reaction, such as the kind of microorganism. The cell structure, solution acidity and alkalinity, substrate concentration and temperature, etc. Among these many factors, the influence of substrate temperature and concentration is particularly important because of the uneven distribution of these parameters, and the instantaneous variation of these parameters. It has a direct effect on the growth of microorganism, and then affects the electrical performance of the battery. By measuring the parameters in real time, the biochemical reaction process of the microbial fuel cell can be well understood. In this paper, a kind of corroded fiber Bragg grating temperature concentration sensor is used to measure the substrate temperature and concentration at the electrode interface of MFC battery in real time. The cross-sensitivity of temperature and concentration can be effectively solved by the numerical analysis of the sensor matrix equation, which is measured simultaneously by temperature and concentration. The main contents of this paper are as follows: 1) the reaction device of two-compartment microbial fuel cell is designed and fabricated. The factors that affect the electric performance of the cell are analyzed. The successful operation of microbial fuel cell provides the experimental basis for further measurement. Through the theoretical analysis of the ordinary fiber Bragg grating, the relationship between the reflection spectrum of the corroded fiber Bragg grating and the refractive index of the external medium is studied. The change of refractive index of external medium and the functional relation of effective refractive index under the propagation mode of fiber grating are obtained. The corrosion-type FBG temperature-concentration sensor is designed and fabricated. By analyzing the unique structure of the sensor, the sensitivity matrix equation is obtained. Through the analysis of experimental data, A high sensitivity sensor with temperature compensation effect. 4) has been designed and an experimental system for simultaneous measurement of temperature and concentration has been set up. The corroded FBG temperature and concentration sensor designed in this paper is used to measure sucrose solution. The simultaneous measurement of temperature and concentration, The experimental results show that the center wavelength of the corrosion sensor shifts linearly with the increase of the concentration of sucrose solution. A microbiological fuel cell system for simultaneous measurement of substrate temperature and concentration was designed and built. By calibrating the temperature and refractive index coefficient in the sensitivity matrix, It can be used to measure the temperature and concentration of the battery substrate in real time. However, the concentration is decreasing in varying degrees. The research in this paper can provide a good experimental means for the study of microcosmic mechanism in the biochemistry reaction of microbial fuel cell. At the same time, the fiber Bragg grating sensor is measured to multiple parameters. The development of high sensitivity can promote the development of high sensitivity.
【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM911.45

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