Bromine and chlorine in aerosols and fly ash when co-firing solid recovered fuel, spruce bark and paper mill sludge in a 80 MWth BFB boiler

Pasi Vainikka, Jaani Silvennoinen, Patrik Yrjäs, A. Frantsi, Lassi Hietanen, Mikko Hupa, Raili Taipale

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Aerosol and fly ash sampling was carried out at a 80MWth bubbling fluidised bed (BFB) boiler plant co-firing solid recovered fuel (SRF), spruce bark and paper mill wastewater sludge in two experimental conditions. The SRF-Bark ratio in the fuel mix was kept constant at 50%-50% on dry mass basis in both experiments but two sludge proportions were used: 15% and 4% on dry mass basis. Aerosol samples were collected from the superheater region of the boiler furnace and fly ash from the electrostatic precipitator (ESP). Na, K, Cl and S were found to be in mainly water soluble compounds in the aerosols sampled by means of a Dekati type Low Pressure Impactor (DLPI). Bromine was found in several weight percentages in aerosols and it was amongst the main elements in some of the samples collected. Bromine is assumed to mainly originate from flame retarded plastics and textiles in the SRF. According to the measurements, the fate of Br seems to be analogous to the other main halogen, Cl, and its conversion from fuel to aerosols was high, indicating a strong tendency to form bromine salts. (13 refs.)
Original languageEnglish
Title of host publicationProceedings of the 20th International Conference on Fluidized Bed Combustion
Place of PublicationBeijing
Pages1061-1066
ISBN (Electronic)9783642026812
Publication statusPublished - 2009
MoE publication typeA4 Article in a conference publication
Event20th International Conference on Fluidized Bed Combustion - Xi'an, China
Duration: 18 May 200921 May 2009

Conference

Conference20th International Conference on Fluidized Bed Combustion
CountryChina
CityXi'an
Period18/05/0921/05/09

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Vainikka, P., Silvennoinen, J., Yrjäs, P., Frantsi, A., Hietanen, L., Hupa, M., & Taipale, R. (2009). Bromine and chlorine in aerosols and fly ash when co-firing solid recovered fuel, spruce bark and paper mill sludge in a 80 MWth BFB boiler. In Proceedings of the 20th International Conference on Fluidized Bed Combustion (pp. 1061-1066).