燃煤锅炉高温腐蚀气体激光在线监测设备研究

李龙; 师帅; 宫廷; 田亚莉; 郭古青; 邱选兵; 熊小鹤; 李传亮

doi:10.37188/CO.2023-0209

燃煤锅炉高温腐蚀气体激光在线监测设备研究

doi: 10.37188/CO.2023-0209

1.
太原科技大学应用科学学院山西省精密测量与在线检测装备工程研究中心, 山西省光场调控与融合应用技术创新中心, 太原 030024
2.
西安交通大学热流科学与工程教育部重点实验室, 陕西西安 710049

基金项目: 国家自然科学基金（No. U1810129，No. 52076145，No. 12304403）；山西省留学人员科技活动项目（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）；山西省基础研究计划（No. 202203021222204）

详细信息

作者简介:
李　龙（1998—），男，山西朔州人，硕士研究生，2020年于太原科技大学获得学士学位，主要从事激光光谱学及应用等方面的研究。E-mail：allong08@163.com

李传亮（1983—），男，山东沂源人，博士，教授，博士生导师，2011年于华东师范大学获得博士学位，主要从事激光光谱学及应用、材料无损检测、光电传感装备等方面的研究。E-mail：clli@tyust.edu.cn

中图分类号: O433.5+1
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出版历程
- 网络出版日期: 2024-05-15

Research on laser online monitoring equipment for high-temperature corrosive gas in coal-fired boilers

1.
Shanxi Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
2.
MOE Key Laboratory of Thermo-fluid Science and Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China

Funds: Supported by National Natural Science Foundation of China (No. U1810129, No. 52076145, No. 12304403); Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province (No. 20230031); Shanxi Scholarship Council of China (No. 2023-151); Fundamental Research Program of Shanxi Province (No. 202203021222204)

More Information

Corresponding author: clli@tyust.edu.cn

摘要

摘要:
燃煤锅炉燃烧场的经济性、安全性和环保性对于智慧电厂建设具有重要意义。H₂S和CO是燃煤锅炉燃烧场两种主要高温腐蚀气体，不仅腐蚀锅炉近壁面，其尾气对大气环境的危害都是极其严重的。基于近红外可调谐半导体激光吸收光谱技术，结合波长调制光谱技术和频分复用技术，研制了一款无人值守的燃煤锅炉主燃区H₂S和CO气体浓度在线实时监测设备。仿真模拟了6335−6341 cm⁻¹范围内气体吸收光谱，选定1.5 μm附近的近红外激光器作为激光光源；研制了一套耐高温耐腐蚀的Herriott型多光程池，实现激光与气体相互作用的效光程达15 m；开发了硬件电路及相应的固件程序，实现了H₂S和CO吸收光谱信号的二次解调信号与浓度反演。线性度和Allan方差实验表明，其线性拟合相关系数分别为0.9998和0.9995，在73 s和53 s的积分时间下，H₂S和CO最低检测极限分别为0.2×10⁻⁶ mol/mol和0.344×10⁻⁶ mol/mol。最后，将研制的设备在某300 MW电负荷的四角切圆燃煤锅炉主燃区燃烧气氛场进行应用示范，对水冷壁附近的H₂S和CO进行了同步测量。结果表明，锅炉中H₂S和CO的浓度呈正相关，厌氧燃烧会导致两种气体的含量增加，造成对水冷壁的腐蚀。
- 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
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 spectroscopy 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 absorption 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 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 demodulation of the absorption spectroscopy signals of H₂S and CO and concentration inversion. The linearity and Allan 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 coal-fired boiler under a four-corner tangential firing system, 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.
- boiler water wall corrosion /
- wavelength modulation spectroscopy /
- frequency division multiplexing /
- high-temperature multi-pass absorption cell /
- long-term online monitoring.

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图 1 H₂S、CO及CO₂吸收谱线

Figure 1. H₂S, CO and CO₂ absorption lines

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图 2 气体测量设备框图

Figure 2. Block diagram of gas measurement equipment

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图 3 H₂S和CO吸收信号的幅度与标准气体浓度的关系

Figure 3. The relationship between the amplitude and standard gas concentration of H₂S and CO absorption signals

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图 4 10×10⁻⁶ mol/mol的H₂S和100×10⁻⁶ mol/mol的CO吸收信号随时间的Allan方差

Figure 4. Allan variance of 10×10⁻⁶ mol/mol H₂S and 100×10⁻⁶ mol/mol CO absorption signals

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图 5 现场测量48 h的H₂S和CO浓度数据

Figure 5. On-site measurement of H₂S and CO concentration data for 48 hours

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