气候变化领域集成服务门户(CCPortal): Effects of temperature; atmosphere; silicon occurrences on fine particle formation from vaporization during high-silicon coal combustion

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DOI	10.1016/j.fuel.2020.118649
	Effects of temperature; atmosphere; silicon occurrences on fine particle formation from vaporization during high-silicon coal combustion
	Gong B.; Tian C.; Xiong Z.; Yang Y.; Wu J.; Li W.; Du Y.; Liu H.; Wang Y.; Zhao Y.; Zhang J.
发表日期	2020
ISSN	162361
卷号	280
英文摘要	Pure silica, typical high-silicon coals (Xuanwei area, China) and their low temperature ashes (LTA) were selected to carry out a vaporization experiment in different atmospheres to reveal the release mechanism of silicon. Further, high-silicon coal combustion experiments were conducted using a drop tube furnace (DTF) to investigate the formation behaviors of fine particulate matter (PM) and the distribution of silicon in the different-sized particles. Field emission scanning electron microscopy (FESEM) equipped with energy dispersive X-ray spectroscopy (EDX) and X-ray fluorescence spectrometry (XRF) were used to study the morphology and chemical compositions, respectively. The results show that the high temperature would promote Si-bearing compounds vaporization and fine particle emission. The SiO2 vaporization rate in the reducing atmosphere (steam and CO2) is much higher than that in the oxidizing atmosphere (air and CO2/O2). Higher O2 concentrations in CO2/O2 atmospheres will handicap Si-bearing compounds vaporization; the SiO2 vaporization rate of Yantang coal decreased from 4.7% to 3.9% as the O2 concentration increased from 10% to 30% at 1400 °C. A maximum value of the PM1.0 concentration can be observed at 0.1 μm, and there is a peak content of SiO2 in PM10, which is in the range of 60–80% for different temperatures. The mechanism of PM0.1 formation is related to the vaporization-coagulation of the refractory SiO2 and secondary Si-bearing compounds, and the more Si that vaporizes at high temperatures, the more PM0.1 that is generated during coal combustion. © 2020 Elsevier Ltd
英文关键词	Coal combustion; Fine particles; High-silicon coal; Mineral transformation; Silicon vaporization
scopus关键词	Atmospheric temperature; Carbon dioxide; Coal; Energy dispersive spectroscopy; Field emission microscopes; Fluorescence spectroscopy; Scanning electron microscopy; Silica; Silicon oxides; Vaporization; Chemical compositions; Combustion experiments; Effects of temperature; Energy dispersive X ray spectroscopy; Field emission scanning electron microscopy; Fine particulate matter; Low temperature ashes; X ray fluorescence spectrometry; 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/176745
作者单位	State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan, 430074, China; Hubei Key Laboratory of Waterjet Theory and New Technology, Department of Power and Mechanical Engineering, Wuhan University, Wuhan, 430074, China; Zhengzhou Electric Power College, Zhengzhou, 450000, China
推荐引用方式 GB/T 7714	Gong B.,Tian C.,Xiong Z.,et al. Effects of temperature; atmosphere; silicon occurrences on fine particle formation from vaporization during high-silicon coal combustion[J],2020,280.
APA	Gong B..,Tian C..,Xiong Z..,Yang Y..,Wu J..,...&Zhang J..(2020).Effects of temperature; atmosphere; silicon occurrences on fine particle formation from vaporization during high-silicon coal combustion.Fuel,280.
MLA	Gong B.,et al."Effects of temperature; atmosphere; silicon occurrences on fine particle formation from vaporization during high-silicon coal combustion".Fuel 280(2020).