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A Study of the Reactivity and Formation of the Unburnt Carbon in CFB Fly Ashes
Author(s) -
Li Yong,
Zhang JiangSheng,
Liu Qing,
Lu JiLing,
Yue GuangXi,
Sarofim Adel F.,
Beér Janos M.,
Lee Yam Y.,
Eliasson Baldur
Publication year - 2001
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500090310
Subject(s) - carbon fibers , char , fly ash , pyrolysis , chemical engineering , inertinite , reactivity (psychology) , materials science , mineralogy , coal , chemistry , composite material , vitrinite , organic chemistry , composite number , medicine , alternative medicine , pathology , engineering
A comprehensive study was conducted on the reactivify and the turbostratic structure of the unburnt carbon in the CFB fly ashes. The observed deactivation of the unburnt carbon and the pyrolysis chars prepared under various conditions was studied and found to be due to the combination of the loss of catalytic effect of the minerals and the crystalline growth of carbon. Various forms of morphology of the residual carbon particles were examined under a microscope. Both inertinite and vitrinite seem to be possible sources of the unburnt carbon. The formation of the unburnt carbon in the CFB fly ashes was likely caused by the deactivation of char particles and the insufficient residence time of the corresponding fuel particles.