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- Gulyurtlu, Ibrahim, et al.
(författare)
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PRODUCTION OF FINES DURING CO-COMBUSTION OF COAL WITH BIOMASS FUELS BY FRAGMENTATION AND ATTRITION
- 2005
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Ingår i: Proceedings of the 8th International Conference on Circulating Fluidized Beds Hangzhou, China, May 10-13, 2005. - 7506274426 ; , s. 565-573
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Konferensbidrag (refereegranskat)abstract
- Results are reported from a project funded by the RFCS Programme of the European Union. The aim is to investigate, experimentally and by modeling, the production of fine char and ash particles during co-combustion of coal with wastes and biofuels in circulating fluidized bed. Work was undertaken at installations of different scales. Polish and Colombian coals were base fuels. The additional fuels were two sewage sludges. Bed temperature, feeding system, sand particle size, devolatilisation behaviour and char burn-out were studied to verify their influence on the fine particle production. Modeling was also carried out to understand the mechanisms of fragmentation and attrition. Samples from bed and cyclone were collected to determine particle size distributions.
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- Wiesendorf, V, et al.
(författare)
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THE CFB BOILER IN GARDANNE - AN EXPERIMENTAL INVESTIGATION OF ITS BOTTOM ZONE
- 1999
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Ingår i: Proc. of the 15th International Conference on Fluidized Bed Combustion.
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Konferensbidrag (refereegranskat)abstract
- Different measurement techniques have been used to analyze the fluid dynamics in the bottom zone of the 250 MWe Circulating Fluidized Bed (CFB) boiler in Gardanne, France. In particular, horizontal profiles of the local solids volume concentration have been measured with a capacitance probe and the vertical pressure profile has been measured by a probe with densely spaced pressure taps. Local velocities were measured by cross-correlating the signals of a twochannel capacitance probe. In order to get some information on the influence of the flow structure on local combustion conditions a probe has been used which combines both capacitance and zirconia-cell sensors. This probe measured simultaneously local solids volume concentrations, local velocities and the local presence of oxygen. The results show the existence of a dense bed with a bed height of about 2% of the total riser height. This bottom bed has a flow structure which is different from the core-annulus structure observed in the upper dilute zone of the CFB combustor by several researchers (e.g. Berruti et al. (1995)). The lateral solids mixing does not seem to be enough to provide an even distribution of char over the whole cross-section of the bottom bed. Nevertheless, an even temperature distribution has been found indicating that mixing is sufficient to equalize the uneven heat generation.
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