Nitrogen oxide formation in black liquor single droplet combustion

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)

Interna författare/redaktörer

Publikationens författare: Kymalainen M, Forssen M, Kilpinen P, Hupa M
Publiceringsår: 2001
Tidskrift: Nordic Pulp and Paper Research Journal
Tidskriftsakronym: NORD PULP PAP RES J
Volym: 16
Nummer: 4
Artikelns första sida, sidnummer: 346
Artikelns sista sida, sidnummer: 354
Antal sidor: 9
ISSN: 0283-2631


Nitrogen oxide formation in single droplet combustion of black liquors was measured under different combustion conditions (droplet size 5-​45 mg, temp. 800-​900 °C, O2-​concn. 3-​21​%)​. The NO formation in relation to the carbon conversion is presented. The amts. of NO formed during pyrolysis (pyrolysis-​NO)​, i.e., from the burning of volatile nitrogen species, and during char burning stage (char-​NO) are reported. Under all conditions studied, the NO formation followed the carbon conversion up to about 40-​50​%, after which the NO formation stopped, and began again only when about 90​% of the carbon had been converted. The relative amt. of pyrolysis-​NO varied with droplet size at 900 °C and with oxygen concn. at 800°C. Possible mechanisms for these effects are suggested. The char-​NO originated mostly in the oxidn. of the inorg. residue left after the burnout of the char. The amt. of char-​NO depended on temp.: more NO was formed at 800 °C than at 900 °C. The implications of the findings for NOx emissions in black liquor burning in recovery boilers are discussed.


black liquor, char, measurement, nitrogen oxide, single droplet combustion., volatiles

Senast uppdaterad 2020-01-04 vid 09:13