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可调谐二极管激光吸收光谱(TDLAS)技术以其响应速度快、灵敏度高、非接触等优点得到了广泛应用。基于该技术以燃烧参数诊断为目标,使用一台窄线宽、波长可调谐的分布反馈式(DFB)激光器产生扫描1395.51 nm和1395.69 nm两条H2O吸收谱线的激光,经1×4光纤分束器实现燃烧场内4条平行路径中温度和H2O浓度的同时在线检测,采用分段温度梯度测量方法补偿低温段对高温区域测量的影响,使中心燃烧区域温度的测量精度由原来的10%提高到3%以内。通过控制空气流量,测量三种不同燃烧状态下中心燃烧区域的温度与H2O浓度变化,结果表明,三种燃烧状态的中心燃烧区域温度差约为80 K,H2O浓度与温度变化情况一致,验证了实验系统和数据处理方法的稳定性和可行性,为下一步燃烧层析诊断及燃煤锅炉燃烧效率优化提供了支持。
Tunable diode laser absorption spectroscopy (TDLAS) technology with its fast response, high sensitivity, non-contact and other advantages have been widely used. Based on the technology, a laser with a narrow linewidth and a tunable wavelength tunable DFB laser was used to generate two 1360 nm and 1395.69 nm H 2 O absorption lines. The 1 × 4 fiber Beam device to realize simultaneous on-line detection of temperature and H2O concentration in four parallel paths in the combustion field. The influence of the low-temperature section on the measurement in the high-temperature area is compensated by the segmented temperature gradient measurement method, so that the measurement accuracy of the central combustion area temperature is increased from 10% Increase to 3%. By controlling the air flow rate, the changes of temperature and H2O concentration in the central combustion zone under three different combustion conditions were measured. The results showed that the temperature difference in the central combustion zone of the three combustion states was about 80 K and the H2O concentration was consistent with the temperature change. The stability and feasibility of the experimental system and data processing methods provide support for the next combustion tomography diagnosis and optimization of the combustion efficiency of coal-fired boilers.