【摘要】 针对现有锅炉燃烧高温烟气CO₂浓度测量方法和装置较为复杂，难以实现在线原位测量的问题，本文提出一种基于红外吸收光谱的CO₂浓度测量方法，通过结合动态参比技术，实现高温烟气CO₂浓度的实时准确监测。首先，构建了红外吸收光谱CO₂浓度测量传感器，开展了不同CO₂浓度和温度条件下测量实验，分析了传感器测量准确性受温度及浓度的影响规律。此后，将所构建的传感器应用于某电厂4号机组进行现场实验测试，进一步评价红外吸收光谱CO₂浓度测量传感器的准确性。结果表明：当CO₂浓度低于传感器最大量程的80%时，测量误差在-3%～2%之间，且温度的变化对于测量准确性影响较小；当CO₂浓度达到100%量程时，温度的变化会导致传感器测量准确性显著降低，为满足测量精度要求，需进行测量系统零点与量程校准；在现场运行测试中，系统的零点与量程漂移均小于1%,示值误差在-3%～2%之间。说明所提出的基于红外吸收光谱的CO₂浓度测量方法具有良好的准确性与稳定性。更多还原

【Abstract】 Addressing the complexity of existing methods for the measurement of CO₂ concentration in high-temperature flue gas from boilers, this paper proposes a CO₂ concentration measurement method based on infrared absorption spectroscopy. By integrating dynamic referencing technology, the proposed method enables the real-time and accurate monitoring of CO₂ concentration in high-temperature flue gas. Firstly, an infrared absorption spectroscopy-based CO₂ concentration sensor is developed. Experiments are conducted to evaluate the CO₂ concentration sensor under various conditions. The influences of temperature and concentration on the measurement accuracy of the system are studied. Subsequently, the developed sensor is applied to conduct on-site experimental tests on Unit 4 of a specific power plant. Results illustrated that when the CO₂ concentration is below 80% of the sensor’s maximum range, the measurement error remains within-3% to 2%, and temperature variations have a minor influence on the system’s measurement accuracy. When the CO₂ concentration reaches 100% of the measurement range, the changes in temperature significantly reduce the measurement accuracy of the sensor. At the same time, to meet the accuracy requirements, it is necessary to calibrate the zero point and measurement range of the sensor. During on-site operational testing, both zero point and measurement range drift are less than 1%. The error is within the range from-3% to 2%. This demonstrates that the proposed CO₂ concentration measurement method based on infrared absorption spectroscopy has excellent accuracy and stability.更多还原