Spatially Resolved Temperature Measurements Above a Burning Wood Pellet Using Diode Laser-Based Two-Line Atomic Fluorescence

Borggren, Jesper; Weng, Wubin; Aldén, Marcus; Li, Zhongshan

doi:10.1177/0003702817746996

Cited by 15 publications

(4 citation statements)

References 28 publications

(70 reference statements)

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“…The measured concentrations of HCN and C2H2 in the plume of the burning nylon 66 strips as a function of residence time are shown in Figure 8. After the first 16 s of preheating, the release of HCN and C2H2 almost simultaneously began, and lasted over 20 s. The maximum concentration of HCN was determined to be 4000 ± 820 ppm at 26 s, and the maximum concentration of C2H2 was determined to be 3800 ± 480 ppm at 22 s. During the gas release process, the temperature dropped from about 1220 to 1000 K, similar to the observation of the volatile release of burning biomass particles [2,26].…”

Section: Tran V (Cmsupporting

confidence: 70%

“…After the first 16 s of preheating, the release of HCN and C2H2 almost simultaneously began, and lasted over 20 s. The maximum concentration of HCN was determined to be 4000 ± 820 ppm at 26 s, and the maximum concentration of C2H2 was determined to be 3800 ± 480 ppm at 22 s. During the gas release process, the temperature dropped from about 1220 to 1000 K, similar to the The measured concentrations of HCN and C 2 H 2 in the plume of the burning nylon 66 strips as a function of residence time are shown in Figure 8. After the first 16 s of preheating, the release of HCN and C 2 H 2 almost simultaneously began, and lasted over 20 s. The maximum concentration of HCN was determined to be 4000 ± 820 ppm at 26 s, and the maximum concentration of C 2 H 2 was determined to be 3800 ± 480 ppm at 22 s. During the gas release process, the temperature dropped from about 1220 to 1000 K, similar to the observation of the volatile release of burning biomass particles [2,26].…”

Section: Tran V (Cmsupporting

confidence: 67%

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Simultaneous Quantitative Detection of HCN and C2H2 in Combustion Environment Using TDLAS

Weng

Aldén

2021

Processes

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Emission of nitrogen oxides (NOx) and soot particles during the combustion of biomass fuels and municipal solid waste is a major environmental issue. Hydrogen cyanide (HCN) and acetylene (C2H2) are important precursors of NOx and soot particles, respectively. In the current work, infrared tunable diode laser absorption spectroscopy (IR-TDLAS), as a non-intrusive in situ technique, was applied to quantitatively measure HCN and C2H2 in a combustion environment. The P(11e) line of the first overtone vibrational band v1 of HCN at 6484.78 cm−1 and the P(27e) line of the v1 + v3 combination band of C2H2 at 6484.03 cm−1 were selected. However, the infrared absorption of the ubiquitous water vapor in the combustion environment brings great uncertainty to the measurement. To obtain accurate temperature-dependent water spectra between 6483.8 and 6485.8 cm−1, a homogenous hot gas environment with controllable temperatures varying from 1100 to 1950 K provided by a laminar flame was employed to perform systematic IR-TDLAS measurements. By fitting the obtained water spectra, water interference to the HCN and C2H2 measurement was sufficiently mitigated and the concentrations of HCN and C2H2 were obtained. The technique was applied to simultaneously measure the temporally resolved release of HCN and C2H2 over burning nylon 66 strips in a hot oxidizing environment of 1790 K.

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Section: Tran V (Cmsupporting

confidence: 70%

Section: Tran V (Cmsupporting

confidence: 67%

Simultaneous Quantitative Detection of HCN and C2H2 in Combustion Environment Using TDLAS

Weng

Aldén

2021

Processes

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“…The results showed that the temperature of the volatile gas was about 400 K lower than the combustion environment. Borggren et al 154 and Weng et al 134 measured onedimensional temperature of the volatile fraction above a burning biomass pellet using two-line atomic fluorescence (TLAF). In the measurement, the pellets were burned in the hot flue gas at ∼1500 K from methane premixed flames.…”

Section: ■ Recent Development In Numerical Modeling Of Biomass Conver...mentioning

confidence: 99%

Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

Fatehi

Weng

et al. 2021

Energy Fuels

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Biomass, as a renewable energy source, is available worldwide, is carbon neutral, and can be converted to various types of products depending on the market and on the specific applications. Among different technologies of biomass utilization, thermochemical conversion of biomass is the most efficient method with the shortest time scale of the process. Thermochemical conversion can be used to produce gas or liquid fuels, and it can be used for direct production of heat and electricity. Biomass thermochemical conversion is an active and fast growing field of research. New experimental methods with high spatial and temporal resolution such as laser diagnostics are being introduced, and numerical modeling of the physical and chemical details in biomass conversion is being conducted. In this review, we aim to provide an overview of the recent activities in the field of thermochemical conversion of biomass. Important parameters in the large scale conversion systems, such as temperature distribution, overall conversion rate of fuel, and distribution of different species, are strongly connected to the processes that occur on the scale of a single particle. Understanding the link between transport phenomena, chemical kinetics, and physical transformation on single particle scale can help to unravel issues such as emission and efficiency on the large scale. Hence, the focus of this review is on the single biomass particle, relevant to combustion and gasification systems. Special attention is paid to high fidelity numerical models and state-of-the-art experimental techniques that have been developed or employed over recent years to understand different aspects of biomass thermochemical conversion.

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“…The temperature in the plume was about 300-400 K lower than the one of the ambient hot flue gases at 1790 K, which is consistent with the temperature measurement conducted in the volatile plume of burning biomass particles. [19][20][21] At the beginning, the temperature was 1230 K. The enhanced volatile gas release decreased the temperature to around 1000 K. When the char stage started, the temperature of the gas increased back to around 1400 K. Under the conditions with a high amount of HCl release, the strong HCl absorption dominated the hot water lines, Line 1 and Line 2, and the temperature cannot be accurately obtained. However, the water line absorption interference from Line 3 on the HCl measurement was negligible as the HCl absorption is over 100 times higher than the H 2 O Line 3.…”

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Quantitative Hydrogen Chloride Detection in Combustion Environments Using Tunable Diode Laser Absorption Spectroscopy with Comprehensive Investigation of Hot Water Interference

et al. 2022

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Hydrogen chloride (HCl) monitoring during combustion/gasification of biomass fuels and municipal solid waste, such as polyvinyl chloride (PVC) and food residues, is demanded to avoid the adverse effect of HCl to furnace operation and to improve the quality of the gas products. Infrared tunable diode laser absorption spectroscopy (IR-TDLAS) is a feasible nonintrusive in-situ method for HCl measurements in harsh environments. In the present work, the measurement was performed using the R(3) line of the ν2 vibrational band of HCl at 5739.25 cm–1 (1742.4 nm). Water vapor is ubiquitous in combustion/gasification environments, and its spectral interference is one of the most common challenges for IR-TDLAS. Spectral analysis based on the current well-known databases was found to be insufficient to achieve an accurate measurement. The lack of accurate temperature-dependent water spectra can introduce thousands parts per million (ppm) HCl overestimation. For the first time, accurate spectroscopic data of temperature-dependent water spectra near 5739.3 cm–1 were obtained based on a systematic experimental investigation of the hot water lines in a well-controlled, hot flue gas with a temperature varying from 1100 to 1950 K. With the accurate knowledge of hot water interference, the HCl TDLAS system can achieve a detection limit of about 100 ppm⋅m at around 1500 K, and simultaneously the gas temperature can be derived. The technique was applied to measure the temporally resolved HCl release and local temperature over burning PVC particles in hot flue gas at 1790 K.

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Spatially Resolved Temperature Measurements Above a Burning Wood Pellet Using Diode Laser-Based Two-Line Atomic Fluorescence

Cited by 15 publications

References 28 publications

Simultaneous Quantitative Detection of HCN and C2H2 in Combustion Environment Using TDLAS

Simultaneous Quantitative Detection of HCN and C2H2 in Combustion Environment Using TDLAS

Recent Development in Numerical Simulations and Experimental Studies of Biomass Thermochemical Conversion

Quantitative Hydrogen Chloride Detection in Combustion Environments Using Tunable Diode Laser Absorption Spectroscopy with Comprehensive Investigation of Hot Water Interference

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