Design of residual oxygen measurement system
作者单位：University of Science and Technology Liaoning State Grid Liaoning Electric Power Supply Co.Ltd
会议名称：《第37届中国控制会议》
会议日期：2018年
学科分类：0810[工学-信息与通信工程] 07[理学] 08[工学] 070602[理学-大气物理学与大气环境] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 0706[理学-大气科学] 0835[工学-软件工程] 081002[工学-信号与信息处理]
基 金：supported by the National Nature Science Foundation of China with the grant No.51674140,51474126 and U1560203 supported by Liaoning Province Natural Science Foundation with the grant No.201602388
关 键 词：Zirconia sensor residual oxygen concentration STM32F405RG PID control
摘 要：As the problem of environmental degradation and energy scarcity rapidly worsened, the oxygen content of the flue gas in the industrial furnace can directly reflect the status of combustion in the furnace. The measurement of oxygen content has a great significance to improve the efficiency of fuel. In order to solve this problem, the paper proposes a design scheme, i.e. residual oxygen measurement system is based on zirconium oxide sensor and STM32F405RG is the core controller. The system is composed of a thermocouple temperature compensation circuit, a heating temperature control circuit and a residual oxygen concentration measurement circuit, which can realize real-time and effective measurement of residual oxygen content. In order to enhance the temperature control accuracy and stability of the sensor, the control algorithm is improved, and the segmented PID control algorithm is adopted. Through experiments, it proves that the detection system for the concentration of oxygen can be detected as low as 2×10.