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- Johnsson, Filip, 1960, et al.
(författare)
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An experimental study of in-furnace processes and dynamic behaviour of a 235 MWe CFB boiler
- 2004
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Ingår i: VGB PowerTech. - 1435-3199. ; 84:3, s. 82-87
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Tidskriftsartikel (refereegranskat)abstract
- In a project funded by the 5th Framework Programme of the European Union, a 235 MWe Circulating Fluidized Bed (CFB) boiler is investigated with respect to in-furnace processes and dynamic response to load changes. The purpose of the project is to assess the insufficiently known features of large-scale CFB boilers. The furnace of the boiler has a cross-section of 21 x 10 meters and a height of 44 meters. The boiler is located in Turow, Poland, and is operated on a local brown coal.The project is unique in that several measurement ports were opened in the walls of the large CFB furnace for measurements in various locations inside the furnace. Also, a number of techniques were employed with new probes developed for this type of measurements to form a basis for studies of hydrodynamic processes as well as local variations in gas components (such as O2, CO, THC) and solid bed materials. The paper describes the measurement techniques and provides examples of results obtained from the in-situ measurements and from the dynamic response study.
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| 6. |
- 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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