NDLI: A Scanning Electron Microscope Study on Agglomeration in Petroleum Coke-Fired FBC Boiler

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Iribarne, J. V. Anthony, E. J. Iribarne, A.
Copyright Year	2003
Abstract	Ten samples, from different FBC boiler systems burning petroleum coke, were chosen to study the development, structure and composition of deposits formed by agglomeration at various locations in the boilers. The work focused on examination of the samples by scanning electron microscopy (SEM) and dispersive X-ray analysis (EDX). Chemical analysis and other techniques were also employed. The results obtained have not brought to light any evidence of the participation of the liquid phase or of vanadium or alkaline metal compounds. The CaSO4 of the deposits is high (80 to 100%) and the agglomeration results from the prolonged sintering of CaSO4 particles, until a strong 3-dimensional framework is formed, in which other, unrelated particles may be trapped, without contributing to cohesion. While CaO is still available, “chemical sintering” associated with its conversion to CaSO4 appears to be important, but sintering also occurs by a slower mass transfer mechanism and continues after the depletion of CaO. Deposits formed in regions only reached by fly ash (convection section), and also in-bed deposits, grow from particles <50 μm, mostly very small ones, < 10 μm. Where the bed ash can collect (e.g., J-valves), the deposits grow by the sintering together of larger particles, 100–300 μm, which themselves appear to be conglomerates of smaller particles sintered together.
Sponsorship	Advanced Energy Systems
Starting Page	387
Ending Page	402
Page Count	16
File Format	PDF
ISBN	0791836800
DOI	10.1115/FBC2003-082
e-ISBN	0791836754
Conference Proceedings	17th International Conference on Fluidized Bed Combustion
Language	English
Publisher Date	2003-05-18
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Agglomeration Scanning electron microscope Fbc Petroleum coke Boilers Scanning electron microscopes Agglomeration (materials) Fluidized bed combustion Coke Petroleum
Content Type	Text
Resource Type	Article

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