气候变化领域集成服务门户(CCPortal): Optical investigations on particles evolution and flame properties during pulverized coal combustion in O2/N2 and O2/CO2 conditions

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DOI	10.1016/j.fuel.2019.04.013
	Optical investigations on particles evolution and flame properties during pulverized coal combustion in O2/N2 and O2/CO2 conditions
	Wu J.; Chen L.; Bengtsson P.-E.; Zhou J.; Zhang J.; Wu X.; Cen K.
发表日期	2019
ISSN	162361
起始页码	394
结束页码	403
卷号	251
英文摘要	The evolution of soot and coal/char as well as the flame properties, during pulverized coal combustion in O2/N2 and O2/CO2 conditions, were experimentally studied using optical diagnostics. The jet flames of pulverized coal particles were produced by using an entrained-flow reactor with optical access, and the oxygen concentrations of the gas carrying pulverized coal particles were varied between 0 and 100%. A combination of laser-induced incandescence (LII), laser-induced fluorescence (LIF), elastic laser scattering (ELS), and radiative emission detection methods was employed to characterize the spatial distributions of soot, polycyclic aromatic hydrocarbons (PAHs), coal/char, and the flame temperature. The measured results revealed that ELS signal intensity declined accompanied with the appearance of LIF and LII signals. An evolution pattern of PAHs and soot was investigated to be similar to those found in gaseous hydrocarbon diffusion flames. An abrupt expansion of the pulverized coal particle jet was observed from ELS measurement at the position where coal particle jet was ignited, which was likely attributed to the more intensive dispersion of small particles caused by a rapid elevation of the flame temperature. As the oxygen concentration increased, the ignition distance of pulverized coal particle jet became shorter and the flame temperature increased. The PAHs and soot-loaded regions were shrunk and the sooting region shifted to upstream position of the flame. Nonetheless, replacing N2 with CO2 tended to increase the ignition distance but lower the flame temperature. The peak LII signal, corresponding to the maximum soot volume fraction, increased to a maximum and then decreased with oxygen concentration and the intensity for the O2/N2 case was far larger than for the O2/CO2 case. However, the LIF signal intensities exhibited an apparent decrease with increasing oxygen concentration, and they were nearly consistent when N2 was replaced with CO2, which may imply that the effect of suppressing radical formation on PAHs evolution in CO2 atmosphere was negligible. Elsevier Ltd
英文关键词	Flame temperature; Optical diagnostics; PAHs; Pulverized coal; Soot
scopus关键词	Carbon dioxide; Coal; Dust; Oxygen; Polycyclic aromatic hydrocarbons; Pulverized fuel; Soot; Entrained Flow Reactor; Flame temperatures; Laser induced fluorescence; Optical diagnostics; Polycyclic aromatic hydrocarbons (PAHS); Pulverized coal combustion; Pulverized coal particle; Pulverized coals; Coal combustion
来源期刊	Fuel
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176362
作者单位	State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China; Division of Combustion Physics, Department of Physics, Lund University, P.O. Box 118, Lund, SE-221 00, Sweden
推荐引用方式 GB/T 7714	Wu J.,Chen L.,Bengtsson P.-E.,et al. Optical investigations on particles evolution and flame properties during pulverized coal combustion in O2/N2 and O2/CO2 conditions[J],2019,251.
APA	Wu J..,Chen L..,Bengtsson P.-E..,Zhou J..,Zhang J..,...&Cen K..(2019).Optical investigations on particles evolution and flame properties during pulverized coal combustion in O2/N2 and O2/CO2 conditions.Fuel,251.
MLA	Wu J.,et al."Optical investigations on particles evolution and flame properties during pulverized coal combustion in O2/N2 and O2/CO2 conditions".Fuel 251(2019).