Geochemical behavior of hazardous volatile elements in coals with different geological origin during combustion
Hu, Guangqing1,2,3; Liu, Guijian1,3; Wu, Dun1,2; Fu, Biao1,3
2018-12-01
发表期刊FUEL
卷号233页码:361-376
文章类型Article
摘要The geochemical behaviors of hazardous elements in the combustion process of Chinese coals with different geological origins at different temperatures were studied. The analyzed coal samples were placed in a fixed bed reactor with a quartz tube and heated to six desired temperature points, from 400 degrees C to 900 degrees C with 100 degrees C for each interval. The mineral morphology and composition of coal and coal ash were determined by X-ray fluorescence (XRF), scanning electron microscope-X-ray Energy Dispersive Spectrom (SEM-EDS) and X-ray powder diffraction techniques (XRD). Sequential chemical extraction procedure was used to describe the modes of occurrence of selected hazardous elements in coal. The content of arsenic (As) in coal and coal ash was analyzed by inductively coupled plasma mass spectrometry (ICP-MS), and the content of selenium (Se) and mercury (Hg) in coal ash was analyzed by atomic emission spectrometry (AES) and atomic fluorescence spectrometry (AFS). The volatile characteristics of As, Se and Hg in coal were studied by thermogravimetry (TG). The results show that: 1) the mineral phases of Liuzhuang (LZ) and Huajiahu (HJH) coal samples are mainly composed of clay minerals and silicate minerals and the contents of As, Se and Hg were closely related to the organic matter and inorganic mineral in coal; 2) As mainly exists in organic matter and Se, Hg mainly exists in silicate minerals. The organic As in coal is closely related to the low-rank, low ash content and low As content of coal. The modes of occurrence of Se and Hg may be related to the low element content, low sulfide content in coal and stable sedimentary environment; 3) the relationship between volatilization rate (Vr) of As, Se and Hg elements and combustion temperature is the closest. The differences of Vr of As, Se and Hg elements in coal of different geological origin are mainly related to elements concentration and coal quality; 4) at different heating rates, the Vr curves of As, Se and Hg elements have the characteristics of "S" type, logarithmic type and linear type, respectively; The Initial stable temperature of Vr is different under the influence of element geochemical characteristics. The volatility of As reaches the maximum at 800 degrees C, and Se and Hg reach the maximum at 700 degrees C and 600 degrees C, respectively; 5) The heating rate and the difference of coal quality under different geological origin are important factors affecting the Vr of As, Se and Hg. The maximum weight loss temperature (TP) can be used as an important index to reflect the influence of coal quality and heating rate on the Vr of hazardous elements (As, Se and Hg).
关键词Geochemical Behavior Hazardous Elements Volatilization Rate Heating Rate Combustion
WOS标题词Science & Technology ; Technology
DOI10.1016/j.fuel.2018.06.069
关键词[WOS]POLYCYCLIC AROMATIC-HYDROCARBONS ; FLUIDIZED-BED COMBUSTION ; FLY-ASH PARTICLES ; TRACE-ELEMENTS ; HUAINAN COALFIELD ; SANTA-CATARINA ; POWER-PLANT ; HUMAN HEALTH ; NORTH CHINA ; TRANSFORMATION BEHAVIOR
收录类别SCI
语种英语
WOS研究方向Energy & Fuels ; Engineering
WOS类目Energy & Fuels ; Engineering, Chemical
WOS记录号WOS:000441893200038
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5349
专题黄土与第四纪地质国家重点实验室(2010~)
作者单位1.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui, Peoples R China
2.Anhui Prov Bur Coal Geol, Explorat & Res Inst, Hefei 230088, Anhui, Peoples R China
3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Shanxi, Peoples R China
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Hu, Guangqing,Liu, Guijian,Wu, Dun,et al. Geochemical behavior of hazardous volatile elements in coals with different geological origin during combustion[J]. FUEL,2018,233:361-376.
APA Hu, Guangqing,Liu, Guijian,Wu, Dun,&Fu, Biao.(2018).Geochemical behavior of hazardous volatile elements in coals with different geological origin during combustion.FUEL,233,361-376.
MLA Hu, Guangqing,et al."Geochemical behavior of hazardous volatile elements in coals with different geological origin during combustion".FUEL 233(2018):361-376.
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