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The effect of disintegrated iron-ore pellet dust on deposit formation in a pilot-scale pulverized coal combustion furnace: Part II: Thermochemical equilibrium calculations and viscosity estimations
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap. Luossavaara-Kiirunavaara Aktiebolag (LKAB).
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap. RISE ETC (Energy Technology Centre) AB.ORCID-id: 0000-0002-9395-9928
Loussavaara-Kiirunavaara Limited, Luleå.
Vise andre og tillknytning
2018 (engelsk)Inngår i: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 180, s. 189-206Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Fly ash particles from the combustion of solid-fuels together with disintegrated particles arising from iron-ore pellets result in accumulation of deposits on the refractory linings of the grate-kiln induration machine during the iron-ore pelletizing process. The deposits amass in the high-temperature regions of the induration furnace thus disturbing the flow of gas and pellets. Therefore, to tackle the above-mentioned issues, an understanding of deposit formation mechanism is of crucial importance. This study was conducted with the objective of addressing the effect of disintegrated iron-ore pellet dust on deposit formation and the mechanisms behind deposition (slagging) in the grate-kiln process. A comprehensive set of experiments was conducted in a 0.4 MW pilot-scale pulverized-coal- fired furnace where three different scenarios were considered as follows; Case 1 (reference case): Coal was combusted without the presence of pellet dust. Case 2: Natural gas was combusted together with simultaneous addition of pellet dust to the gas stream. Case 3: Coal was combusted together with the addition of pellet dust simulating the situation in the large-scale setup. Fly ash particles and short-term deposits were characterized and deposition was addressed in Part I of this study. In light of the experimental observations (Part I) and the thermochemical equilibrium calculations (Part II), a scheme of ash transformation during the iron-ore pelletizing process was proposed. The dissolution of hematite particles into the Ca-rich-aluminosilicate melt (from the coal-ash constituents) decreased the viscosity and resulted in the formation of stronger (heavily sintered) deposits. Overall, this pilot-scale work forms part of a wider study which aims at deepening the understanding of ash transformation phenomena during the large-scale pelletizing process.

sted, utgiver, år, opplag, sider
Elsevier, 2018. Vol. 180, s. 189-206
HSV kategori
Forskningsprogram
Energiteknik; Kemisk teknologi; Processmetallurgi
Identifikatorer
URN: urn:nbn:se:ltu:diva-69019DOI: 10.1016/j.fuproc.2018.05.005ISI: 000447580600020Scopus ID: 2-s2.0-85047214684OAI: oai:DiVA.org:ltu-69019DiVA, id: diva2:1211850
Merknad

Validerad;2018;Nivå 2;2018-11-05 (johcin) 

Tilgjengelig fra: 2018-05-31 Laget: 2018-05-31 Sist oppdatert: 2019-01-18bibliografisk kontrollert

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Sefidari, HamidLindblom, BoWiinikka, HenrikLennartsson, AndreasMouzon, JohanneBhuiyan, Iftekhar UddinÖhman, Marcus

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