Fate of Alkali Elements during Pyrolysis and Combustion of Chinese Coals
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概要
- 論文の詳細を見る
The distribution of alkali elements in coal is of the utmost importance for determining their transformation during combustion, however, little is known of it because of their lower concentration in coal. From this viewpoint, several advanced techniques were used in this study to investigate the evolution of alkali elements during combustion of two Chinese coals at 1200°C. The contents of alkali elements were analyzed using Inductively Coupled Plasma (ICP) spectroscopy; their distribution in raw coals and the combustion residues were analyzed by computer controlled SEM (CCSEM); moreover, the particulate matters in the emission gas were collected by a Low Pressure Impactor (LPI) to study the vaporization of these elements in combustion. The results indicate that the organically bound alkali-based compounds totally vaporized during coal pyrolysis, meanwhile, the included ones fragmented into ultra-fine particles with a size of about 1.0 μm, a portion of which entered into a gas atmosphere and changed into particulate matters. On the other hand, the excluded alkali elements have bimodal distribution in raw coals, in which the fine particles fragmented and changed into particulate matters, the large portion having a size of about 20.0 μm kept unchanged till the carbon had burnt out. For the vaporized alkali elements in the particulate matters, they had a bimodal sized-distribution; fine particles of about 0.4 μm were formed from combination of fine Na/Al-Si, NaCl, Na2SO4 and Na3PO4 less than 0.1 μm in size. They could capture the trace elements, too, and a portion of them coagulated into large particles in the particulate matters. The different vaporization behavior of sodium and potassium was also addressed using XPS analysis.
- 社団法人 化学工学会の論文
- 2003-07-01
著者
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ITO Masahide
Department of Electrical and Mechanical Engineering, Seikei University
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SATO Atsushi
Department of Planning for Drug Development and Clinical Evaluation, Tohoku University Graduate Scho
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Zhang L
Department Of Applied Chemistry College Of Engineering Chubu University
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Ninomiya Yoshihiko
Department Of Industrial Chemistry Chubu University
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Ninomiya Yoshihiko
Department Of Applied Chemistry College Of Engineering Chubu University
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Ito Masahide
Department Of Applied Chemistry College Of Engineering Chubu University
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ZHANG Lian
Department of Pharmacology and Biopharmaceutics, Key Laboratory of Drug Targeting and Drug Delivery
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Zhang Lian
Department Of Applied Chemistry College Of Engineering Chubu University
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Sato Atsushi
Department Of Applied Chemistry Chubu University
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Ninomiya Yoshihiko
Department Of Applied Chemistry Chubu University
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Sato A
Department Of Applied Chemistry College Of Engineering Chubu University
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