Scaling of Pulverized-Fuel Jet Flames That Apply Large Amounts of Excess Air—Implications for NOx Formation
Artikel i vetenskaplig tidskrift, 2019

Measures to reduce nitrogen oxides (NOx) formation in industrial combustion processes often require up-scaling through pilot-scale facilities prior to being implemented in commercial scale, and scaling is therefore an important aspect of achieving lower NOx emissions. The current paper is a combined experimental and modelling study that aims to expand the understanding of constant velocity scaling for industrial jet flames applying high amounts of excess air. These types of flames are found in e.g., rotary kilns for production of iron ore pellets. The results show that, even if the combustion settings, velocity, and temperature profiles are correctly scaled, the concentration of oxygen experienced by the fuel during char combustion will scale differently. As the NO formation from the char combustion is important in these flames, the differences induced by the scaling has important impacts on the efficiencies of the applied primary measures. Increasing the rate of char combustion (to increase the Damköhler number), by using, for  example, smaller-sized particles, in the pilot-scale is recommended to improve scaling.

flame

pollution

NOx

rotary kiln

scaling

combustion

Författare

Rikard Edland

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Fredrik Normann

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Thomas Allgurén

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Christian Fredriksson

LKAB

Klas Andersson

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Energies

1996-1073 (ISSN)

Vol. 12 14 2680

Reduktion av CO2-utsläpp från LKABs roterugnsprocess - en studie av effekten av alternativa bränslen

LKAB, 2013-05-01 -- 2016-04-30.

Energimyndigheten, 2013-05-01 -- 2016-04-30.

Ämneskategorier

Oorganisk kemi

Annan teknik

Energiteknik

Drivkrafter

Hållbar utveckling

Styrkeområden

Energi

DOI

10.3390/en12142680

Mer information

Senast uppdaterat

2019-10-25