IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
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
Source PublicationFUEL
Volume233Pages:361-376
SubtypeArticle
AbstractThe 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).
KeywordGeochemical Behavior Hazardous Elements Volatilization Rate Heating Rate Combustion
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.fuel.2018.06.069
WOS KeywordPOLYCYCLIC AROMATIC-HYDROCARBONS ; FLUIDIZED-BED COMBUSTION ; FLY-ASH PARTICLES ; TRACE-ELEMENTS ; HUAINAN COALFIELD ; SANTA-CATARINA ; POWER-PLANT ; HUMAN HEALTH ; NORTH CHINA ; TRANSFORMATION BEHAVIOR
Indexed BySCI
Language英语
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000441893200038
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5349
Collection黄土与第四纪地质国家重点实验室(2010~)
Affiliation1.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
Recommended Citation
GB/T 7714
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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