Temperature and emissivity measurements from combustion of pine wood, rice husk and fir wood using flame emission spectrum

Zheng, Sining; Yang, Yu; Li, Xinyu; Liu, Huawei; Yan, Weijie; Sui, Ran; Lü, Qiang

doi:10.1016/j.fuproc.2020.106423

Cited by 51 publications

(21 citation statements)

References 44 publications

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“…Biorefinery, which aims to convert biomass into energy, chemicals, and bio-based materials, has been proposed for more than 3 decades . Different technologies have been reported to achieve green and efficient biomass utilization. − Fast pyrolysis is a well-known thermochemical technique to convert biomass into solid, liquid, and gas products under an inert condition and high temperatures (300–1000 °C) . Various value-added organic products can be prepared with proper pyrolysis methods and conditions. − …”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Quantum Chemistry Modeling on the Pyrolysis Mechanisms of Lignocellulosic Biomass

et al. 2020

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Pyrolysis of lignocellulose biomass to produce various fuels and chemicals has gained increasing interest in recent decades. An in-depth understanding of the biomass pyrolysis reaction mechanisms is essential for the advancement of pyrolysis techniques. Quantum chemistry (QC) modeling is a powerful approach for the pyrolysis mechanism investigation at the atomic/molecular level. Despite a short history of only about 2 decades, its application to the biomass pyrolysis mechanism exploration has been well-developed, along with the fast advances of supercomputer and computational codes in the new century. This review addresses the recent progress on the pyrolysis mechanism of the three basic biomass components (cellulose, hemicellulose, and lignin) by QC modeling. On the basis of the QC modeling results reported in the literature, the current review critically summarizes the key developments about the pyrolysis chemistry of biomass by focusing on their microscopic elementary reactions, the formation routes of typical products, bimolecular interactions within or between biomass components, and catalytic effects of various catalysts. Notably, there are great gaps between the theoretical models employed in QC modeling and the natural biomass substance in the pyrolysis process. Therefore, a brief analysis of the challenges and future research perspectives is provided for the biomass pyrolysis mechanism research.

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Section: Introductionmentioning

confidence: 99%

Recent Progress in Quantum Chemistry Modeling on the Pyrolysis Mechanisms of Lignocellulosic Biomass

et al. 2020

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“…Based on the flame radiation spectrum, the temperature and spectral emissivity of the flame can be measured simultaneously. − The previous research by the authors showed that the spectral emissivity of the flame of biomass pellets is a variable parameter during the combustion process and that directly adopting the graybody assumption or using the Hottel and Broughton’s emissivity model can cause a temperature measurement error. In the wavelength band of 400–700 nm, the average emissivity of biomass volatile flames was determined to be 0.16 at an equivalence ratio of φ = 0.91, whereas it was 0.10 at an equivalence ratio of φ = 0.71.…”

Section: Introductionmentioning

confidence: 99%

Determination of Flame Temperatures and Soot Volume Fractions during Combustion of Biomass Pellets

Yan

et al. 2021

Energy Fuels

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This article presents a method for real-time simultaneous measurements of the temperature and soot volume fraction distribution of volatile matter flames, forming during combustion of biomass pellets. This method uses flame radiation spectra, captured by a spectrometer, and images, captured by a digital camera, as inputs during combustion of three different types of biomass pellets (pine wood, rice straw, and corn straw). The pellets were ignited and burned in the post-combustion zone of methane gas at 1300 K. The radiation spectrum of the flame in the 500−800 nm wavelength band was selected for spectral analysis, combined with a spectral emissivity model based on polynomial fitting. The flame emissivity was measured at the response wavelengths of a dual band-pass filter (centered at 615 and 517 nm) fitted on the camera, and the resulting emissivity ratio showed the degree of departure from the gray radiation model. The measured emissivity ratio approached unity as the combustion intensity increased. The emissivity ratio of the spectrometer measurement was used to correct the flame temperature measurement obtained by the image method. Upon correction, the maximum relative error of the image temperature measurement was determined to be 2.7% by comparison to thermocouple readings. The experimental results showed that the maximum flame temperatures of pine wood, rice straw, and corn straw pellets were remarkably similar at 1876 ± 2 K. Moreover, the flame burnout durations and the peak soot volume fractions were both positively correlated with the volatile content of biomass pellets; the value of the latter was 1.19 ± 3 ppm. The experimental results measured in this article can provide data for models of the soot generation mechanism of biomass pellet combustion in industrial furnaces.

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“…Rice husks are another interesting source of biomass waste. The characteristics of pine wood and rice husk combustion, including temperature and emission measurements, were presented by [ 8 ]. According to the literature, many kinds of non-wood biomass are potential alternative energy sources.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Pelletized and Unpelletized Sunflower Husks Combustion Process in a Batch-Type Reactor

et al. 2021

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This paper describes characteristics of the combustion of sunflower husk (SH), sunflower husk pellets (SHP), and, for comparison, hardwood pellets (HP). The experiments were carried out using a laboratory-scale combustion reactor. A proximate analysis showed that the material may constitute an alternative fuel, with a relatively high heating value (HHV) of 18 MJ/kg. For SHP, both the maximum combustion temperatures (TMAX = 1110 °C) and the kinetic parameters (temperature front velocity vt = 7.9 mm/min, combustion front velocity vc = 8 mm/min, mass loss rate vm = 14.7 g/min) of the process were very similar to those obtained for good-quality hardwood pellets (TMAX = 1090 °C, vt = 5.4 mm/min, vc = 5.2 mm/min, vm = 13.2 g/min) and generally very different form SH (TMAX = 840 °C, vt = 20.7 mm/min, vc = 19 mm/min, vm = 13.1 g/min). The analysis of ash from SH and SHP combustion showed that it has good physicochemical properties (ash melting point temperatures >1500 °C) and is safe for the environment. Furthermore, the research showed that the pelletization of SH transformed a difficult fuel into a high-quality substitute for hardwood pellets, giving a similar fuel consumption density (Fout = 0.083 kg/s·m2 for SHP and 0.077 kg/s·m2 for HP) and power output density (Pρ = MW/m2 for SHP and 1.5 MW/m2 for HP).

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Temperature and emissivity measurements from combustion of pine wood, rice husk and fir wood using flame emission spectrum

Cited by 51 publications

References 44 publications

Recent Progress in Quantum Chemistry Modeling on the Pyrolysis Mechanisms of Lignocellulosic Biomass

Recent Progress in Quantum Chemistry Modeling on the Pyrolysis Mechanisms of Lignocellulosic Biomass

Determination of Flame Temperatures and Soot Volume Fractions during Combustion of Biomass Pellets

Comparative Analysis of Pelletized and Unpelletized Sunflower Husks Combustion Process in a Batch-Type Reactor

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