基于激光吸收光谱的CO/CO<sub>2</sub>/H<sub>2</sub>S浓度同步在线测量研究

doi:10.3964/j.issn.1000-0593(2024)05-1412-05

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摘要： CO、CO₂、H₂S是燃煤锅炉炉内气氛重要组成部分，其浓度不仅能够反映燃烧工况，还可作为水冷壁高温腐蚀程度判断依据，因此实现CO、CO₂、H₂S浓度的准确测量意义重大。首先采用波长调制-直接吸收（WM-DAS）方法结合约40 m长光程Herriott池，在室温低压下，开展不同CO/CO₂浓度配比下三种气体吸收率同步测量实验，结果表明三种气体的吸收率测量值与理论计算值相近，相对误差在6.82%以内，测量结果可靠性较高；然后对不同浓度CO/CO₂（0~2 000 μL·L^-1）、H₂S（0~20 μL·L^-1）进行动态测量，结果表明，测量系统对三种组分浓度变化的响应具有较好的线性度。

关键词：波长调制-直接吸收光谱；CO浓度；CO₂浓度；H₂S浓度；同步测量

Abstract：CO, CO₂ and H₂S are important components of the atmosphere in the coal-fired boiler. Their concentrations can not only reflect the combustion conditions but also serve as the basis for judging the high-temperature corrosion degree of the water wall. Therefore, it is of great significance to measure the concentrations of CO, CO₂, and H₂S accurately. In this work, the WM-DAS method and Herriott cell with a length of about 40 m were used to carry out synchronous measurement of three kinds of gas absorptivity under different CO/CO₂ concentration ratios at room temperature and low pressure. The results showed that the measured values of the absorptivity of the three gases agree very well with the theoretical calculation values, and the relative error is within 6.82%, which suggests the highly reliable of this method. Subsequently, the dynamic measurement of CO/CO₂ (0~2 000 μL·L^-1） and H₂S （0~20 μL·L^-1) was carried out. The results showed that the measurement system has good linearity in response to the concentration changes of the three components.

Key words：Wavelength modulation-direct absorption spectroscopy; CO concentration; CO₂ concentration; H₂S concentration; Simultaneous measurement

收稿日期: 2023-01-09 修订日期: 2023-08-25

中图分类号:

TN247

基金资助: 国家自然科学基金项目(11972213)和国家重点研发计划项目(2019YFB20060002)资助

通讯作者: 彭志敏 E-mail: apspect@tsinghua.edu.cn

作者简介: 张学军，1974年生，浙江浙能中煤舟山煤电有限责任公司工程师 e-mail: 465628684@qq.com

引用本文:

张学军，陈勤根，杨展，邓琴，贺拴玲，彭志敏. 基于激光吸收光谱的CO/CO₂/H₂S浓度同步在线测量研究[J]. 光谱学与光谱分析, 2024, 44(05): 1412-1416.
ZHANG Xue-jun, CHEN Qin-gen, YANG Zhan, DENG Qin, HE Shuan-ling, PENG Zhi-min. On Line Simultaneous Measurement of CO/CO₂/H₂S Concentration Based on Laser Absorption Spectrum. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(05): 1412-1416.

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