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The Fate of Liquor Droplet Residues Carried Over from the Lower Furnace in Kraft Recovery Boilers (LIEKKI 2-523)

The Fate of Liquor Droplet Residues Carried Over from the Lower Furnace in Kraft Recovery Boilers

Datum: 1.2.1997-30.8.1998
Kod: 17714
Institution: Åbo Akademi / Kemisk-tekniska fakulteten (KTF), Förbränningskemiska forskargruppen vid ÅA
Adress: Lemminkäinengatan 14 - 18 B, FIN-20510 Åbo
Tel. +358-2-2154 455
Fax +358-2-2154 780
E-post rbackman@abo.fi
Projektledare: TkD Mikko Hupa, professor (1.3.1996-30.6.1998)
TkD Rainer Backman, (1.2.1997-30.8.1998)
Forskare: TkD Bengt-Johan Skrifvars (1.2.1997-30.8.1998)
DI Mikael Forssén (1.2.1997-30.8.1998)
DI Tor Laurén (1.2.1997-30.8.1998)
TkL Maritta Kymäläinen (1.2.1997-30.8.1998)
Typ av forskning: 1 (0=Inom tjänst, 1=Beställd forskning, 2=Samarbetsforskning)
- utvecklingsarbete 100 %
Årsverken: Totalt: 114 månader
Partner: Ahlström Machinery Oy; Kvaerner Pulping Oy; Royal Institute of Technology, Sweden; Tampere University of Technology
Ämnesord: förbränningsteknik, avfallsgaser, rökgaser, utsläpp, polttotekniikka, jätekaasut, savukaasut, päästöt, förbränning, förgasning, forskningsprogram, combustion, gasification, research programme,

Svenskt abstrakt föreligger tyvärr inte.

The carry-over-problem in kraft recovery boilers is studied in order to find new ways of minimizing the amount of carry-over in practice.By combining results from field measurements, 3D-simulation of droplet trajectories, laboratory studies, and advanced chemical modeling, the influence of recovery boiler operation and black liquor quality on the formation of carry-over is clarified.The sintering tendency of synthetic carry-over particles are determined in gases containing SO2, CO2, HCl, and H2O.The chemical reactions of carry-over particles in the flue gas channel are studied by multiphase/multicomponent non-ideal modeling.The amount of carry-over particles entering the superheater region is determined by 3D-flow calculations.The boiler design used is the same as in the boiler where field measurements are done.This part is done at the Department of Heat Engineering and Furnaces at KTH.In measurements, the amount of carry-over particles are measured at the entrance to the superheater region in one kraft recovery boiler.A specially designed air/water cooled probe can monitor the carry-over amount at different points in the cross-section of the upper furnace.Flue gas temperature and flow is determined in each point.Also, chemical analysis of the probe samples are made.

Publikation(er)

1.10.1996 / 18.6.1998