TDLAS直接吸收法测量CO<sub>2</sub>的基线选择方法

朱晓睿; 卢伟业; 饶雨舟; 李越胜; 卢志民; 姚顺春

doi:10.3788/CO.20171004.0455

TDLAS直接吸收法测量CO₂的基线选择方法

doi: 10.3788/CO.20171004.0455

朱晓睿^{1, 3,},
卢伟业²,
饶雨舟^{1, 3},
李越胜²,
卢志民^{1, 3},
姚顺春^{1, 3, ,}

1.
华南理工大学电力学院, 广东广州 510640
2.
广东省特种设备检测研究院顺德检测院, 广东佛山 528300
3.
广东省能源高效清洁利用重点实验室, 广东广州 510640

基金项目:

广东省质量技术监督局科技计划项目 2016ZT01

"广东特支计划"科技青年拔尖人才资助项目 2014TQ01N334

广州市珠江科技新星专项 2014J2200054

详细信息

作者简介:
朱晓睿(1993-), 男, 广东湛江人, 硕士研究生, 主要从事TDLAS技术监测气体方面的研究。E-mail:1241997882@qq.com

姚顺春(1983-), 男, 浙江龙游人, 博士, 副教授, 硕士生导师, 主要从事燃烧诊断、排放监测及其控制技术方面的研究

通讯作者:
姚顺春, E-mail:epscyao@scut.edu.cn

中图分类号: O443.1
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出版历程
- 收稿日期: 2017-02-21
- 修回日期: 2017-03-31
- 刊出日期: 2017-08-01

Selection of baseline method in TDLAS direct absorption CO₂ measurement

ZHU Xiao-rui^{1, 3
,},
LU Wei-ye²,
RAO Yu-zhou^{1, 3},
LI Yue-sheng²,
LU Zhi-min^{1, 3},
YAO Shun-chun^{1, 3
, ,}

1.
School of Electric Power, South China University of Technology, Guangzhou 510640, China
2.
Shunde Inspection Institute, Special Equipment Inspection and Research Institute of Guangdong Province, Foshan 528300, China
3.
Key Laboratory of Efficient and Clean Energy Utilization of Guangdong Province, Guangzhou 510640, China

Funds:

Science and Technology Project of GDQTS 2016ZT01

Project of "Guangdong Special Branch Plan "Science Young Talents 2014TQ01N334

Guangzhou Pearl River Science and Technology Rising Star Special Project 2014J2200054

More Information

Corresponding author: YAO Shun-chun, E-mail:epscyao@scut.edu.cn

摘要

摘要: 本文基于可调谐半导体激光吸收谱线（TDLAS）技术的直接吸收测量，选用中心工作波长为1 580 nm的DFB激光器，在室温及大气常压条件下检测了模拟烟气中的CO₂浓度；采用去峰拟合法和纯N₂线拟合法获得基线后反算出了CO₂的浓度，并将反算结果进行了对比。结果表明：采用纯N₂线拟合法反算出的浓度的最大相对误差为2.64%，均方值为1.69%；采用去拟合法反算出的浓度的最大相对误差为9.81%，均方值为7.81%。以纯N₂吸收谱线作基线的纯N₂线拟合方法反算出的浓度的准确度较高，可以为CO₂浓度测量的基线选择提供参考。
- 可调谐半导体激光吸收谱线技术 /
- 直接吸收 /
- CO₂测量 /
- 光谱分析
Abstract: Based on the direct absorption measurement of absorption spectrum of tunable diode laser absorption spectroscopy (TDLAS) technology, the DFB laser of 1 580 nm center wavelength is chosen to detect the concentration of CO₂ in simulated flue gas at room temperature and atmospheric pressure. The concentration of CO₂ is computed by removing absorption peak fitting method and pure N₂ line fitting method, and the two computed results are compared. The results show that the maximum relative error of concentration is 2.64% for the pure N₂ line fitting method, and the mean square value is 1.69%; the maximum relative error of concentration got from the removing absorption peak fitting method is 9.81%, and the mean-square value is 7.81%. Using the method of pure N₂ line fitting method, the accuracy of concentration is greatly improved, so the method can provide baseline selection reference for CO₂ measurement.
- tunable diode laser absorption spectroscopy (TDLAS) technology /
- direct absorption /
- CO₂ measurement /
- spectral analysis

HTML全文

图 1 CO₂、H₂O、NO在1 580 nm附近的吸收谱线图^[12]

Figure 1. Absorption lines of CO₂, H₂O, NO nearby 1 580 nm

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图 2 实验装置图

Figure 2. Experimental setup

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图 3 1 580 nm激光器测得的纯N₂线与各体积分数CO₂的吸收谱线

Figure 3. Pure N₂ line and absorption lines of different concentrations of CO₂ measured by 1 580 nm laser

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图 4 去峰拟合法获得的基线

Figure 4. Baseline obtained by the removing absorption peak fitting method

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图 5 纯N₂线拟合法获得的基线

Figure 5. Baseline obtained by the pure N₂ line fitting method

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图 6 CO₂配置浓度与反算浓度之间的线性关系

Figure 6. Linear relationship between true concentration of CO₂ and its fitted concentration

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表 1 去峰拟合法处理得到的结果

Table 1. Results obtained by the removingabsorption peak fitting method

Serial number	True concen- tration/%	Fitted concen- tration/%	Absolute error/%	Relative error/%
1	10	9.5	-0.48	-4.88
2	12	10.8	-1.17	-9.81
3	14	12.7	-1.27	-9.12
4	16	14.9	-1.04	-6.51
5	18	16.7	-1.22	-6.81
6	20	18.3	-1.71	-8.56

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表 2 纯N₂线拟合法处理得到的结果

Table 2. Results obtained by the pure N₂ line fitting method

Serial number	True concen- tration/%	Fitted concen- tration/%	Absolute error/%	Relative error/%
1	10	10.1	0.05	0.55
2	12	12.2	0.27	2.32
3	14	14.3	0.37	2.64
4	16	16.1	0.12	0.78
5	18	17.9	-0.03	-0.17
6	20	19.6	-0.38	-1.92

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