燃煤锅炉高温腐蚀气体激光在线监测设备研究
Research on laser online monitoring equipment for high-temperature corrosive gas in coal-fired boilers
摘要
Abstract
The coal-fired boiler combustion process's economic,safety,and environmental performance holds great significance when constructing smart power plants.In coal-fired boiler combustion,H2S and CO are the two main high-temperature corrosive gases.They not only corrode the boiler near the wall surface but also pose severe harm to the atmospheric environment through their exhaust gases.Based on the near-infrared tunable diode laser absorption spectroscopy technology,combined with wavelength modulation spectro-scopy and frequency division multiplexing technology,an unstaffed online real-time monitoring instrument for H2S and CO gas concentrations in the main combustion zone of coal-fired boilers was developed.Gas ab-sorption spectroscopy in the 6335～6341 cm-1 range was simulated,and two near-infrared lasers near 1.5 μm were selected as the laser source.A high-temperature resistant and corrosion-resistant Herriott-type multi-pass cell was developed to attain an effective optical path length of 15 m for the interaction between laser and gas.Hardware circuits and corresponding firmware programs were developed to attain secondary demodula-tion of the absorption spectroscopy signals of H2S and CO and concentration inversion.The linearity and Al-lan variance experiments showed linear fitting correlation coefficients of 0.9998 and 0.9995.At 73 s and 53 s integration times,the minimum detection limits for H2S and CO were 0.2×10-6 mol/mol and 0.344×10-6 mol/mol,respectively.Finally,the developed instrument was applied in the combustion atmosphere of the main combustion zone of a 300 MW tangential four-corner coal-fired boiler,and synchronous measurements of H2S and CO near the water-cooled wall were conducted.The results indicated a positive correlation between the concentrations of H2S and CO in the boiler,with anaerobic combustion leading to an increase in the content of these gases and causing corrosion to the water-cooled wall.关键词
锅炉水冷壁腐蚀/波长调制光谱/频分复用/高温多光程吸收池/长期在线监测Key words
corrosion of water cooled wall in boiler/wavelength modulation spectroscopy/frequency divi-sion multiplexing/high-temperature multi-pass absorption cell/long-term online monitoring分类
数理科学引用本文复制引用
李龙,师帅,宫廷,田亚莉,郭古青,邱选兵,熊小鹤,李传亮..燃煤锅炉高温腐蚀气体激光在线监测设备研究[J].中国光学（中英文）,2024,17(5):1060-1067,8.基金项目
国家重点研发计划(No.2023YFF0718100) （No.2023YFF0718100）
国家自然科学基金(No.52076145,No.12304403) （No.52076145,No.12304403）
山西省科技创新人才团队专项资助(No.202304051001034) （No.202304051001034）
山西省留学人员科技活动项目(No.20230031) （No.20230031）
山西省省筹资金资助回国留学人员科研资助项目(No.2023-151) （No.2023-151）
山西省基础研究计划(No.202203021222204,No.202303021212224) Supported by the National Key Research and Development Program of China(No.2023YFF0718100) （No.202203021222204,No.202303021212224）
Nation-al Natural Science Foundation of China(No.52076145,No.12304403) （No.52076145,No.12304403）
the Special Fund for Science and Technology Innovation Teams of Shanxi Province(No.202304051001034) （No.202304051001034）
Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province(No.20230031) （No.20230031）
Shanxi Scholar-ship Council of China(No.2023-151) （No.2023-151）
Fundamental Research Program of Shanxi Province(No.202203021222204,No.202303021212224) （No.202203021222204,No.202303021212224）
