【作者】 周明；

【导师】 司光远；

【作者基本信息】 东北大学 ， 控制工程（专业学位）， 2020， 硕士

【摘要】 大气环境污染与人们的身心健康密切相关。随着我国经济的快速发展,环境保护日益受到重视,而对于大气环境的保护,最重要的就是做好对固体污染源排放烟气的监测,设计多参数烟气在线监测系统对于监测烟气排放具有重要的现实意义。本文采用不分光红外法(NDIR)设计了烟气监测系统,实现了对烟气中SO2、NO气体的实时快速测量。论文基于Lambert-Beer定律,采用NDIR双通道检测法进行了烟气监测系统设计,完成了包括红外光源、气室设计、探测器选型在内的光路设计;针对红外光源信号偏弱问题,采用ALD技术对气室内壁进行镀膜实现光学信号增强;采用以STM32F103C8T6单片机为主控芯片进行了包括光源驱动电路、信号处理电路等数据采集与数据处理电路的设计;采用QT编写与之对应的上位机处理系统。最后对整个烟气监测系统进行零点标定,通过测量不同组分气体标准浓度的待测气体,拟合得到探测器输出电压和对应气体浓度的关系。通过对测量数据的分析修正烟气中SO2、NO气体间的相互干扰,完成了样机并进行了现场安装和对烟气的测量实验。实验验证烟气监测系统的相对误差为5%,重复性和稳定性在±1%以内。更多还原

【Abstract】 Air pollution is closely related to people’s physical and mental health.With the rapid development of China’s economy,environmental protection has been paid more and more attention.For the protection of the atmospheric environment,the most important thing is to do a good job in the monitoring of the flue gas discharged from the solid pollution sources.The design of multi parameter flue gas online monitoring system has important practical significance for the monitoring of flue gas emissions.In this thesis,flue gas monitoring system is designed by NDIR,which can realize the real-time and rapid measurement of SO2 and NO in flue gas.Based on Lambert-Beer’s law,this thesis adopts NDIR dual channel detection method to design the flue gas monitoring system,and completes the optical path design including infrared light source,gas chamber design and detector selection.Aiming at the problem of weak signal of infrared light source,ALD technology is used to coat the wall of the gas chamber to realize optical signal enhancement.Stm32f103c8t6 single chip is used as the main control chip including the design of data acquisition and data processing circuits such as light source driving circuit,signal processing circuit,etc.QT is used to write the corresponding upper computer processing system.Finally,the zero calibration of the whole flue gas monitoring system is carried out,and the relationship between the output voltage of the detector and the corresponding gas concentration is obtained by measuring standard concentration of different components.Through the analysis of the measurement data,the mutual interference between SO2 and NO in the flue gas is corrected,and the prototype is completed,and the field installation and the measurement experiment of the flue gas are carried out.The experimental results show that the relative error of the flue gas monitoring system is 5%,the repeatability and stability are within±1%.更多还原