【作者】 梁向锋；

【导师】 孙长库；

【作者基本信息】 天津大学 ， 测试计量技术及仪器， 2008， 硕士

【摘要】 分析氧含量在工业生产、医学和环境保护等领域有着十分重要的意义。提高燃烧效率,合理利用能源,已成为工业生产中的一个重大课题。在石油、发电、化工等领域,锅炉中烟气氧含量可直接反映燃烧状况,氧含量的测量是非常重要的。本文研究的烟气含氧量在线检测技术是基于氧化锆固体电解质测氧的原理,论文分析了影响氧量测量的各种外在内在因素,得出了烟气氧含量在线测量的实际刻度方程,氧化锆传感器工作温度的恒定控制是提高测量精度的关键性技术之一。综合目前比较常见的温度控制算法,提出一种模糊-PI分段控制的控温方法,并将该方法应用于本系统的设计中,由此设计了适合于烟气含氧量在线检测的测控电路,实验证明该方法显著地提高了氧化锆传感器的控温精度和稳定性。本系统电路设计中采用新型微控制器MSP430系列单片机作为核心,简化了系统硬件设计工作,提高了系统的抗干扰性与稳定性,并给出了氧电势放大电路、热电偶温补调理模块、电压电流转换模块以及通讯模块等外围电路的设计与实现,对其性能做了实验测试,完全满足氧化锆传感器氧含量检测对精度与稳定性的要求。更多还原

【Abstract】 Analysis of oxygen content is very important in the field of industrial production,medicine and environmental protection. How to improve the combustion efficiency and utilize energy sources rationally has been a very important subject in industrial production. In oil, energy, chemical and many other areas, the oxygen content of the flue in boiler can directly reflect the combustion conditions. So it is important to measure the oxygen content.With analyzing ZrO2 oxygen content principle and kinds of outside and intrinsic factors affected the measurement of the oxygen content, we make a practical equation that used in online measurement of oxygen content in flue gas, and draw a conclusion that the important key to improve measure precision of oxygen content is the stable control of the sensor’s work temperature. A kind of PI-Fuzzy control method is provided to control the sensor’s work temperature, the experiment testified the method can remarkably improve precision and stability of sensor’s working temperature control.The design based on the MSP430 mcu released the hardware work, increased the anti-jamming and stability of system, and also contained the oxygen voltage magnifying circuit, the thermocouple compensation circuit, standard current signal output circuit, communication circuit, etc. Experiment was made to test performance of the circuit, and the circuit fulfilled the request of oxygen content measuring about precision and stability.更多还原