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No 17 / 23

New Black Liquor Combustion Characteristics III (LIEKKI 2-516)

Date: 1.3.1996-30.6.1998
Code: 17611
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 762
Fax +358-2-2154 780
E-mail mforssen@abo.fi
Project leader: TkD Mikko Hupa, professor (1.3.1996-30.6.1998)
DI Mikael Forssén, (1.3.1996-30.6.1998)
Researchers: TkD Rainer Backman (1.3.1996-30.6.1998)
TkD Bengt-Johan Skrifvars (1.3.1996-30.6.1998)
DI Sonja Enestam (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: 224 months
Partners: Finnish Recovery Boiler Committee; Ahlstrom Machinery Oy; Kvaerner Pulping Oy
Keywords: förbränningsteknik, avfallsgaser, rökgaser, utsläpp, polttotekniikka, jätekaasut, savukaasut, päästöt, förbränning, förgasning, forskningsprogram, combustion, gasification, research programme,

The main purposes in the work is to: 1) Compare black liquor combustion characterization results to recovery boiler experiences. 2) Study the mechanisms of sodium release in black liquor combustion and to 3) further develop the combustion characterization measurement methods.In the first part results from laboratory scale black liquor combustion characterization tests developed at Åbo Akademi University have been compared to experiences of fouling at four finnish kraft recovery boilers.Characterisation results showed good agreement with deposit growth measurements and melting properties of collected deposits.The second part studies the release mechanisms of sodium from black liquor char during combustion.Molten sodiumcarbonate reacts with the char carbon and gaseous elemental sodium is formed.Special interest is the effect of in which form the sodium salt (Na2CO3, Na2SO4, Na2S2O3, Na2S and NaCl) is in the liquor.In the third part the laboratory characterisation methods are further developed.The gaseous combustion products are measured with on-line gas-anlayzers (CO2, CO, SO2 and NO) and the signals are mathematically processed (deconvolution).The different combustion stages (pyrolysis, char combustion and inorganic reactions) are identified in the results.


1.10.1996 / 18.6.1998