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Countermeasures against alkali-related problems during combustion of biomass in a circulating fluidized bed boiler

Kent Davidsson (Institutionen för energi och miljö, Energiteknik) ; Lars-Erik Åmand (Institutionen för energi och miljö, Energiteknik) ; Britt-Marie Steenari (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Anna-Lena Elled (Institutionen för energi och miljö, Energiteknik) ; David Eskilsson ; Bo Leckner (Institutionen för energi och miljö, Energiteknik)
Chemical Engineering Science Vol. 63 (2008), p. 5314-5329.
[Artikel, refereegranskad vetenskaplig]

The purpose of this work was to study different ways to mitigate alkali-related problems during combustion of biomass in circulating fluidized beds. Wood chips and wood pellets were fired together with straw pellets, while the tendency to agglomerate and form deposits was monitored. In addition to a reference case, a number of countermeasures were applied in related tests. Those were addition of elemental sulphur, ammonium sulphate and kaolin to a bed of silica sand, as well as use of olivine sand and blast-furnace slag as alternative bed materials. The agglomeration temperature, composition and structure of bed-ash samples were examined. The flue-gas composition, including gaseous alkali chlorides, was measured in the hot flue gases and in the stack. Particles in the flue gas were collected and analysed for size distribution and composition. Deposits were collected on a probe in hot flue gases and their amount and composition were analysed. Addition of kaolin was found to be the best method to counteract the agglomeration problem. The deposition problem is effectively counteracted with addition of ammonium sulphate, while kaolin is too expensive to be used commercially against deposits, and sulphur is less effective than ammonium sulphate.

Nyckelord: Agglomeration, Biofuels, Combustion, Deposition, Gases, Particulate processes

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Denna post skapades 2008-10-29. Senast ändrad 2016-08-15.
CPL Pubid: 76631


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Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik (2005-2017)
Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)


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