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No 22 / 24

The Structure and Behaviour of Salts in Kraft Recovery Boilers (LIEKKI 2-515)

Date: 1.3.1996-28.2.1998
Code: 17613
Department: Åbo Akademi University / Faculty of Chemical Engineering (KTF), Combustion Chemistry Research Group of ÅAU
Address: Lemminkäinengatan 14 - 18 B, FIN-20510 Åbo
Phone +358-2-2154 455
Fax +358-2-2154 780
E-mail rbackman@abo.fi
Project leader: Rainer Backman, (1.3.1996-28.2.1998)
Researchers: DI Sonja Enestam (1.3.1996-30.6.1998)
TkD Ron Zevenhoven (1.3.1996-30.6.1998)
DI Tor Laurén (1.3.1996-30.6.1998)
MSc Radu-Dan Badoi (1.3.1996-30.6.1998)
Type of research: 1 (0=Within duty, 1=Ordered research, 2=Co-operation)
- developmental work 100 %
Man months: Totally: 96 months
Partners: Ahlstrom Machinery Oy; Energitekniskt Centrum Piteå, Sweden; Kvaerner Pulping Oy; University of Umeå, Sweden.
Keywords: förbränningsteknik, avfallsgaser, rökgaser, utsläpp, polttotekniikka, jätekaasut, savukaasut, päästöt, förbränning, förgasning, forskningsprogram, combustion, gasification, research programme,

The melting behaviour in the salt system (Na,K)(CO3,SO4,S,Cl,OH) is investigated by laboratory methods to develop a chemical model for salt mixtures with compositions relevant for recovery boilers.The model, based on both literature data and experimental work can be used as (a) submodel in models for the over-all chemistry in recovery boilers and to estimate (b) deposit formation on heat transfer surfaces (fouling), (c) the melting properties of the fly ash, and (d) the smelt bed in recovery boilers.Experimental techniques used are thermal analysis, high temperature microscopy, and scanning electron microscopy.


1.10.1996 / 18.6.1998