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DYNAMICS OF IN-FURNACE PROCESSES IN A CFB BOILER

Andreas Johansson (Institutionen för energi och miljö, Energiteknik) ; ByungHo Song ; Filip Johnsson (Institutionen för energi och miljö) ; Lars-Erik Åmand (Institutionen för energi och miljö, Energiteknik) ; Bo Leckner (Institutionen för energi och miljö, Energiteknik)
Proceedings of the 8th International Conference on Circulating Fluidized Beds p. 159-166. (2005)
[Konferensbidrag, refereegranskat]

With the aim of understanding the dynamics of combustion, this work examines simultaneous fluctuations in fluid dynamic parameters and gas composition in a CFB furnace operated with coal as a fuel. Fluid dynamic parameters are pressure and air flow to the furnace. Gas composition was obtained by a zirconia-cell probe and a gas suction probe connected to a mass spectrometer having a high time resolution (10 Hz). The fluctuations of interest are around 1 Hz and below 0.3 Hz. The fluctuations below 0.3 Hz, which have not been investigated previously, are found to originate from irregularities in the fuel feed. These irregularities give rise to periods of reducing conditions because high inputs of fuel yield an increased pressure in the furnace and a decreased air feed to the furnace, which then occurs concurrent with the release of a high amount of volatiles. There is also a correlation between reducing conditions and the concentration of hydrocarbons.

Nyckelord: fluidized bed combustion, zirconia-cell probe, reducing conditions, fluid dynamic parameters, mass spectrometer



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Denna post skapades 2016-06-20. Senast ändrad 2016-08-15.
CPL Pubid: 237921