Sammanfattning
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.
Originalspråk | Odefinierat/okänt |
---|---|
Sidor (från-till) | 346–354 |
Antal sidor | 9 |
Tidskrift | Nordic Pulp and Paper Research Journal |
Volym | 16 |
Nummer | 4 |
DOI | |
Status | Publicerad - 2001 |
MoE-publikationstyp | A1 Tidskriftsartikel-refererad |
Nyckelord
- black liquor
- char
- measurement
- nitrogen oxide
- single droplet combustion.
- volatiles