TDLAS在森林可燃物热解气体多组分同步测量中的应用分析

doi:10.3964/j.issn.1000-0593(2024)03-0625-07

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Abstract Pyrolysis of forest combustibles is an important research topic in forest fires and is of great significance for early warning and control of forest fires. The pyrolysis of forest combustibles mainly produces carbonaceous gases such as CO, CO₂, and CH₄. The continuous release of these gases will likely trigger forest fires and aggravate the greenhouse effect. The rapid and accurate detection of the concentrations of these three components is beneficial for early warning of fires and atmospheric environmental protection. In this paper, the concentrations of three CO, CO₂, and CH₄ components in the pyrolysis gases of six mountain forest tree species samples were accurately measured by frequency division multiplexing combined with tunable diode laser absorption spectroscopy (TDLAS) technique. The applicability of the frequency division multiplexing-TDLAS technique for simultaneous multi-component measurements of pyrolysis gases of forest combustibles is demonstrated. Firstly, the basic principle of the frequency division multiplexing-TDLAS technique is introduced, and the absorption spectra of the three components are determined without interfering with each other and with suitable spectral intensity. Secondly, the characteristics of the second harmonic (2f) signal and the second harmonic/DC (2f/DC) signal are investigated to invert the different concentrations accurately. The difference in the accuracy of inversion of different concentrations using the 2f signal and 2f/DC signal is compared using Simulink simulation, and the results show that the 2f/DC signal has a larger linear interval and is suitable for the measurement of different concentration components in the pyrolysis gas of forest combustibles. Finally, an experimental setup for simultaneous CO, CO₂, and CH₄ measurements was built using two distributed feedback (DFB) lasers with center wavelengths of 1 580.0 and 1 653.7 nm, respectively. The 2f/DC signals of the three components were measured using a Herriott absorber cell, and the absolute concentrations of the three components in the pyrolysis gas were obtained by establishing calibration models with standard gases. The results showed that the peak 2f/DC signals of the three components satisfied a good linear relationship with the concentrations withlinearity greater than 0.995, and the concentrations of CO in the pyrolysis gases of the six tree samples were significantly higher than those of CO₂, and CH₄ under the effect of the coke gasification reaction and Boundouard reaction. by analyzing the spectra of Chinese sweetgum leaf samples, it was shown that within the 2 s measurement time, the spectroscopic system for CO, CO₂, and CH₄ with a minimum detection limit lower than 0.008% and sensitivity better than 0.005%, which meets the demand of forest fire early warning. This study provides a methodological reference for the simultaneous multi-component measurement of pyrolysis gases of forest combustibles and forest fire early warning.

Key words：Forest fires; Combustibles pyrolysis; TDLAS; Frequency division multiplexing; Simultaneous measurements

Received: 2022-09-27 Accepted: 2022-11-23

ZTFLH:

O433.1

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

Cite this article:

GUO Song-jie,WANG Lu-peng,CHEN Jin-zheng, et al. Application and Analysis of Multi-Component Simultaneous Measurement of Forest Combustibles Pyrolysis Gas Based on TDLAS[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(03): 625-631.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2024)03-0625-07 OR https://www.gpxygpfx.com/EN/Y2024/V44/I03/625

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