论文部分内容阅读
搭建了一套基于可调谐半导体激光光谱技术的测量装置,实现了对高温环境中CO的检测。此装置采用波长调制技术,并选取CO在6395.4 cm!1的R14线作为吸收线,不仅提高了装置的信噪比,降低了检出限,还可以避开其它气体组分的干扰。通过建立不同温度下的水汽背景库来扣除CO吸收峰处的水汽干扰信号,同时得到水汽浓度和温度的信息,再结合温度信息以及建立的CO标准库,实现对CO的测量。测量结果表明,对CO浓度的检测范围在0.1%~10%之间,检出限为0.03%,测量误差在5%以内;温度的检测范围为300℃~1000℃,测量误差在10%以内。此装置能为炼钢冶炼及发电燃烧过程提供CO浓度及温度信息,从而提高燃烧效率,降低尾气排放。
A set of measuring device based on tunable semiconductor laser spectroscopy was set up to detect CO in high temperature environment. The device adopts wavelength modulation technology and selects R14 line with CO of 6395.4 cm! 1 as the absorption line, which not only improves the signal-noise ratio of the device but also reduces the detection limit and avoids the interference of other gas components. The water vapor interference signal at the CO absorption peak is deducted by setting up the background database of water vapor at different temperatures, and the information of water vapor concentration and temperature is obtained. Combined with the temperature information and the established CO standard library, the CO measurement is realized. The measurement results show that the detection range of CO concentration is between 0.1% and 10%, the detection limit is 0.03%, the measurement error is within 5%, the detection range of temperature is from 300 ℃ to 1000 ℃ and the measurement error is within 10% . This device can provide CO concentration and temperature information for steelmaking and power generation combustion process to improve combustion efficiency and reduce exhaust emissions.