基于紫外吸收的烟气中NO和NO<SUB>2</SUB>成分浓度的同时测量

doi:10.3964/j.issn.1000-0593.2008.04.031

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Abstract Ultraviolet absorption optical depths of NO and NO₂ gas mixture with different concentrations were measured, using a high resolution grating monochromator. By correlating fast-varying discrete absorption and slow-varying continuous absorption with NO and NO₂ contributions respectively, the mole concentrations of NO and NO₂ were derived synchronously. The study results indicated that, when the total pressure of gas mixture approached to one atmospheric pressure, a strong tendency that two moles of NO₂ were combined into one mole of N₂O₄ was found. The maximum conversion rate from NO₂ to N₂O₄ was roughly 22.5%, resulting in the fact that the effective absorption cross-section of NO₂ -N₂O₄ mixture mainly depended on that of N₂O₄, which exhibited continuous characteristics in its absorption spectrum. The discrete absorption cross-section spectrum was broadened with the increase in the partial pressure of NO. It was shown that the integral of absorption cross-sections within a discrete absorption band had better linear correlation with NO concentration than the discrete absorption cross-section peak. The measurement and derivation results indicated that, when the partial pressure of NO₂ varied within 17-100 Pa, the average relative error for the derived NO₂ concentration was 11.7%. When the partial pressure of NO varied within 63.8-181.62 Pa, the maximum and average relative error for the derivation of NO concentration was 16.9% and 9.6% respectively by using the spectrum integral method, while the corresponding data rose to 38.2% and 14.4% by using the spectral peak method. The technique can be applied to synchronous monitoring of NO and NO₂ concentration with relatively simple measurement hardware.

Key words： Optical density Nitric oxide Nitric dioxide Concentration

Received: 2006-11-12 Accepted: 2007-02-16

ZTFLH:

TQ591

Corresponding Authors: ZHOU Jie E-mail: zhoujie6801@zju.edu.cn

Cite this article:

ZHOU Jie,ZHANG Shi-liang. Synchronous Measurement of Concentrations of Nitric Oxide and Nitric Dioxide in Flue Gas by Ultraviolet Absorption Analysis[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(04): 870-874.

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http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593.2008.04.031 OR http://www.gpxygpfx.com/EN/Y2008/V28/I04/870

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