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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 University of Technology, Sweden.
Luleå University of Technology, Sweden ; LKAB, Sweden.
RISE - Research Institutes of Sweden, Bioekonomi, ETC Energy Technology Center. Luleå University of Technology, Sweden.ORCID-id: 0000-0002-9395-9928
LKAB, Sweden.
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2018 (Engelska)Ingår i: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 180, s. 189-206Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2018. Vol. 180, s. 189-206
Nyckelord [en]
Coal combustion, Deposition (slagging), Iron-ore pellet dust, Iron-ore pelletizing, Thermochemical equilibrium calculations, Calcium compounds, Coal, Coal ash, Coal deposits, Coal dust, Deposits, Economic geology, Fly ash, Furnaces, Hematite, Iron deposits, Iron ore pellets, Iron ores, Kilns, Pelletizing, Pulverized fuel, Viscosity, Alumino-silicate melts, Combustion of solid fuels, Deposit formation mechanism, Iron ore pelletizing, Pulverized coal combustion, Pulverized coal-fired furnaces, Thermochemical equilibrium, Viscosity estimation
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Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-35593DOI: 10.1016/j.fuproc.2018.05.005Scopus ID: 2-s2.0-85047214684OAI: oai:DiVA.org:ri-35593DiVA, id: diva2:1261198
Anmärkning

 Funding details: LTU, Luleå Tekniska Universitet; Funding text: LKAB ( Luossavaara-Kiirunavaara Aktiebolag ) and Luleå University of Technology are acknowledged for their financial support of this study ( Dnr 93_2014

Tillgänglig från: 2018-11-06 Skapad: 2018-11-06 Senast uppdaterad: 2019-06-17Bibliografiskt granskad

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Wiinikka, Henrik

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