In Situ Detection of NO in Flue Gas with a Mid-infrared Interband Cascade Laser Absorption Spectroscopy
This work aims to investigate the potential of TDLAS techniques in the nitric oxide detection in SCR devices.We report a tunable diode laser absorption sensor for in situ detection of NO in flue gas at up to 650K based on a mid-infrared distributed feedback interband cascade laser.An NO absorption line of 1926.29cm-1 was selected to avoid water vapor and CO2 interference and the 2f-wavelength modulation spectroscopy was utilized to improve the signal-to-noise ratio.Sensor testing in laboratory was conducted for NO steady state measurement with concentrations between 20 to 200 ppm at temperature from 300K to 650K in a self-designed single-pass absorption cell which provided an effective path length of 700mm.For in situ measurement,the sensor was further installed in the 2m-path exhaust near the exit of SCR device of a CFB boiler to realize online continuous detection.The sensor showed fast time response and high precision in practical NO monitoring with 40 ％transient change in NO concentration caused by spray ammonia flow rate fluctuation.
M.Y.Li F.Wang
State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou,China
国际会议
国际测量技术联合会(IMEKO)2017年国际测量技术研讨会
杭州
英文
309-309
2017-09-04（万方平台首次上网日期，不代表论文的发表时间）