Study on measurement method of high-temperature CO gas concentration based on TDLAS technology

The combustion of industrial furnace is an indispensable part of metal smelting and industrial power generation. In order to solve the problem of full combustion of coal in the furnace, it is necessary to accurately control the CO concentration in the industrial furnace. In the high temperature and high pressure environment of the industrial furnace, we choose the direct absorption spectroscopy method in the tunable semiconductor laser absorption spectroscopy technology to measure the CO concentration. In this paper, a high temperature blackbody furnace is used to simulate the high temperature and pressure environment in an industrial furnace, direct absorption spectrometry is used to measure the concentration of 5000ppm CO gas in 100℃-1100℃ environment. When the temperature in the blackbody furnace is 100℃-600℃, the relative error of experimental measurement is controlled within 10%; When the temperature exceeds 700℃, the relative error of measurement exceeds 20%, the measurement error is large, which can not meet the requirements of industrial application measurement accuracy.