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Bo Lindblom - One of the best experts on this subject based on the ideXlab platform.

  • combustion evaluation of renewable fuels for Iron Ore Pellet induration
    Energy & Fuels, 2019
    Co-Authors: Henrik Wiinikka, Bo Lindblom, A V Sepman, Yngve Ogren, Larsolof Nordin
    Abstract:

    Induration (or sintering) of Iron-Ore Pellets requires high temperature (∼1300 °C), which today is generated by burning fuel oil in the firing zone of the straight-grate plant (SG) or coal in the rotary kiln of grate-kiln (GK) plants. In this study, ∼150 kWth combustion experiments were used to investigate the opportunity of totally replacing fuel oil with H2 or pyrolysis oil and replacing coal with wood Pellets or black Pellets powder. For SG plants, the fuel oil can probably be replaced with either H2 or pyrolysis oil without any major concerns, except for slightly or much higher NOx emissions in the case of pyrolysis oil and H2, respectively. For GK induration machines, it is probably challenging to replace coal entirely with biomass since the temperature profile will be different, and there is a risk for increased ash related operational problems. For both SG and GK plants, the slightly lower O2 concentration in the flue gas observed during biomass combustion (pyrolysis oil, wood Pellets, and black pe...

  • 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
    Fuel Processing Technology, 2018
    Co-Authors: Hamid Sefidari, Larsolof Nordin, Bo Lindblom, Henrik Wiinikka, Andreas Lennartsson, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Marcus Ohman
    Abstract:

    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-ki ...

  • the effect of disintegrated Iron Ore Pellet dust on deposit formation in a pilot scale pulverized coal combustion furnace part i characterization of process gas particles and deposits
    Fuel Processing Technology, 2018
    Co-Authors: Hamid Sefidari, Larsolof Nordin, Bo Lindblom, Henrik Wiinikka, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Marcus Ohman
    Abstract:

    Abstract To initiate the elucidation of deposit formation during the Iron-Ore Pelletization 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 grate-kiln setup. Particles and deposits were sampled from 3 positions of different temperature via a water-cooled sampling probe. Three distinct fragmentation modes were identified based on the aerodynamic particle diameter (Dp). The fine mode: Particles with 0.03   10 μm). A transition from a bimodal PSD (particle size distribution) to a trimodal PSD was observed when Pellet dust was added (Case 3) and consequently the elemental bulk composition of the abovementioned modes was changed. The most extensive interaction between Pellet dust and coal-ash particles was observed in the coarse mode where a significant number of coal ash globules were found attached to the surface of the hematite particles. The morphology of the sharp-edged hematite particles was changed to smooth-edged round particles which proved that hematite particles must have interacted with the surrounding aluminosilicate glassy phase originating from the coal ash. The short-term deposits collected during coal combustion (Case 1) were highly porous in contrast to the high degree of sintering observed in the experiments with Pellet dust addition (Case 3) which is attributed to the dissolution of hematite particles in the aluminosilicate glassy phase. The results suggest that Pellet dust itself (Case 2) has low slagging tendency, independent of temperature. However, when coal-ash is present (Case 3), auxiliary phases are added such that tenacious particles are formed and slagging occurs.

  • Drying of an Iron Ore Pellet : investigation of the influence of surface irregularities and overall geometry
    2016
    Co-Authors: Annalena Ljung, Staffan Lundström, Ulf Sjöström, Daniel Marjavaara, Bo Lindblom, Kent Tano
    Abstract:

    In this paper, simulations of the first drying period of a single Iron Ore Pellet are compared for: i) a scanned Pellet from experiments ii) an oval Pellet resembling the experimental one with equi ...

  • deposit formation in a grate kiln plant for Iron Ore Pellet production part 1 characterization of process gas particles
    Energy & Fuels, 2013
    Co-Authors: Carrie Y C Jonsson, Jesper Stjernberg, Bo Lindblom, Henrik Wiinikka, Dan Bostrom, Marcus Ohman
    Abstract:

    Slag formation in the grate-kiln process is a major problem for Iron-Ore Pellet producers. It is therefOre important to understand the slag formation mechanism in the grate-kiln production plant. T ...

Marcus Ohman - One of the best experts on this subject based on the ideXlab platform.

Larsolof Nordin - One of the best experts on this subject based on the ideXlab platform.

  • combustion evaluation of renewable fuels for Iron Ore Pellet induration
    Energy & Fuels, 2019
    Co-Authors: Henrik Wiinikka, Bo Lindblom, A V Sepman, Yngve Ogren, Larsolof Nordin
    Abstract:

    Induration (or sintering) of Iron-Ore Pellets requires high temperature (∼1300 °C), which today is generated by burning fuel oil in the firing zone of the straight-grate plant (SG) or coal in the rotary kiln of grate-kiln (GK) plants. In this study, ∼150 kWth combustion experiments were used to investigate the opportunity of totally replacing fuel oil with H2 or pyrolysis oil and replacing coal with wood Pellets or black Pellets powder. For SG plants, the fuel oil can probably be replaced with either H2 or pyrolysis oil without any major concerns, except for slightly or much higher NOx emissions in the case of pyrolysis oil and H2, respectively. For GK induration machines, it is probably challenging to replace coal entirely with biomass since the temperature profile will be different, and there is a risk for increased ash related operational problems. For both SG and GK plants, the slightly lower O2 concentration in the flue gas observed during biomass combustion (pyrolysis oil, wood Pellets, and black pe...

  • 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
    Fuel Processing Technology, 2018
    Co-Authors: Hamid Sefidari, Larsolof Nordin, Bo Lindblom, Henrik Wiinikka, Andreas Lennartsson, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Marcus Ohman
    Abstract:

    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-ki ...

  • the effect of disintegrated Iron Ore Pellet dust on deposit formation in a pilot scale pulverized coal combustion furnace part i characterization of process gas particles and deposits
    Fuel Processing Technology, 2018
    Co-Authors: Hamid Sefidari, Larsolof Nordin, Bo Lindblom, Henrik Wiinikka, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Marcus Ohman
    Abstract:

    Abstract To initiate the elucidation of deposit formation during the Iron-Ore Pelletization 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 grate-kiln setup. Particles and deposits were sampled from 3 positions of different temperature via a water-cooled sampling probe. Three distinct fragmentation modes were identified based on the aerodynamic particle diameter (Dp). The fine mode: Particles with 0.03   10 μm). A transition from a bimodal PSD (particle size distribution) to a trimodal PSD was observed when Pellet dust was added (Case 3) and consequently the elemental bulk composition of the abovementioned modes was changed. The most extensive interaction between Pellet dust and coal-ash particles was observed in the coarse mode where a significant number of coal ash globules were found attached to the surface of the hematite particles. The morphology of the sharp-edged hematite particles was changed to smooth-edged round particles which proved that hematite particles must have interacted with the surrounding aluminosilicate glassy phase originating from the coal ash. The short-term deposits collected during coal combustion (Case 1) were highly porous in contrast to the high degree of sintering observed in the experiments with Pellet dust addition (Case 3) which is attributed to the dissolution of hematite particles in the aluminosilicate glassy phase. The results suggest that Pellet dust itself (Case 2) has low slagging tendency, independent of temperature. However, when coal-ash is present (Case 3), auxiliary phases are added such that tenacious particles are formed and slagging occurs.

  • extended studies of degradation mechanisms in the refractory lining of a rotary kiln for Iron Ore Pellet production
    Journal of The European Ceramic Society, 2012
    Co-Authors: Jesper Stjernberg, Martalena Antti, Larsolof Nordin, Bo Lindblom, Magnus Oden
    Abstract:

    Changes, over a period of 8 years, in the chemical composition and morphology of deposit and lining materials in a production rotary kiln for Iron Ore Pellet manufacture are described. The followin ...

  • degradation of refractory bricks used as thermal insulation in rotary kilns for Iron Ore Pellet production
    International Journal of Applied Ceramic Technology, 2009
    Co-Authors: Jesper Stjernberg, Martalena Antti, Larsolof Nordin, Magnus Oden
    Abstract:

    Degradation of bricks in an Iron Ore Pellet producing kiln has been investigated. Lab-scale tests of brick/slag interaction performed under different temperatures, atmospheres, and alkali additions ...

Henrik Wiinikka - One of the best experts on this subject based on the ideXlab platform.

  • combustion evaluation of renewable fuels for Iron Ore Pellet induration
    Energy & Fuels, 2019
    Co-Authors: Henrik Wiinikka, Bo Lindblom, A V Sepman, Yngve Ogren, Larsolof Nordin
    Abstract:

    Induration (or sintering) of Iron-Ore Pellets requires high temperature (∼1300 °C), which today is generated by burning fuel oil in the firing zone of the straight-grate plant (SG) or coal in the rotary kiln of grate-kiln (GK) plants. In this study, ∼150 kWth combustion experiments were used to investigate the opportunity of totally replacing fuel oil with H2 or pyrolysis oil and replacing coal with wood Pellets or black Pellets powder. For SG plants, the fuel oil can probably be replaced with either H2 or pyrolysis oil without any major concerns, except for slightly or much higher NOx emissions in the case of pyrolysis oil and H2, respectively. For GK induration machines, it is probably challenging to replace coal entirely with biomass since the temperature profile will be different, and there is a risk for increased ash related operational problems. For both SG and GK plants, the slightly lower O2 concentration in the flue gas observed during biomass combustion (pyrolysis oil, wood Pellets, and black pe...

  • 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
    Fuel Processing Technology, 2018
    Co-Authors: Hamid Sefidari, Larsolof Nordin, Bo Lindblom, Henrik Wiinikka, Andreas Lennartsson, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Marcus Ohman
    Abstract:

    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-ki ...

  • the effect of disintegrated Iron Ore Pellet dust on deposit formation in a pilot scale pulverized coal combustion furnace part i characterization of process gas particles and deposits
    Fuel Processing Technology, 2018
    Co-Authors: Hamid Sefidari, Larsolof Nordin, Bo Lindblom, Henrik Wiinikka, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Marcus Ohman
    Abstract:

    Abstract To initiate the elucidation of deposit formation during the Iron-Ore Pelletization 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 grate-kiln setup. Particles and deposits were sampled from 3 positions of different temperature via a water-cooled sampling probe. Three distinct fragmentation modes were identified based on the aerodynamic particle diameter (Dp). The fine mode: Particles with 0.03   10 μm). A transition from a bimodal PSD (particle size distribution) to a trimodal PSD was observed when Pellet dust was added (Case 3) and consequently the elemental bulk composition of the abovementioned modes was changed. The most extensive interaction between Pellet dust and coal-ash particles was observed in the coarse mode where a significant number of coal ash globules were found attached to the surface of the hematite particles. The morphology of the sharp-edged hematite particles was changed to smooth-edged round particles which proved that hematite particles must have interacted with the surrounding aluminosilicate glassy phase originating from the coal ash. The short-term deposits collected during coal combustion (Case 1) were highly porous in contrast to the high degree of sintering observed in the experiments with Pellet dust addition (Case 3) which is attributed to the dissolution of hematite particles in the aluminosilicate glassy phase. The results suggest that Pellet dust itself (Case 2) has low slagging tendency, independent of temperature. However, when coal-ash is present (Case 3), auxiliary phases are added such that tenacious particles are formed and slagging occurs.

  • deposit formation in a grate kiln plant for Iron Ore Pellet production part 1 characterization of process gas particles
    Energy & Fuels, 2013
    Co-Authors: Carrie Y C Jonsson, Jesper Stjernberg, Bo Lindblom, Henrik Wiinikka, Dan Bostrom, Marcus Ohman
    Abstract:

    Slag formation in the grate-kiln process is a major problem for Iron-Ore Pellet producers. It is therefOre important to understand the slag formation mechanism in the grate-kiln production plant. T ...

  • deposit formation in a grate kiln plant for Iron Ore Pellet production part 2 characterization of deposits
    Energy & Fuels, 2013
    Co-Authors: Jesper Stjernberg, Bo Lindblom, Carrie Y C Jonsson, Henrik Wiinikka, Dan Bostrom, Marcus Ohman
    Abstract:

    Buildup of deposit material in chunks on refractory linings caused by combustion of various fuels is a well-known problem. This study characterizes the short-term deposits on refractory material in ...

Hamid Sefidari - One of the best experts on this subject based on the ideXlab platform.

  • 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
    Fuel Processing Technology, 2018
    Co-Authors: Hamid Sefidari, Larsolof Nordin, Bo Lindblom, Henrik Wiinikka, Andreas Lennartsson, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Marcus Ohman
    Abstract:

    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-ki ...

  • the effect of disintegrated Iron Ore Pellet dust on deposit formation in a pilot scale pulverized coal combustion furnace part i characterization of process gas particles and deposits
    Fuel Processing Technology, 2018
    Co-Authors: Hamid Sefidari, Larsolof Nordin, Bo Lindblom, Henrik Wiinikka, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Marcus Ohman
    Abstract:

    Abstract To initiate the elucidation of deposit formation during the Iron-Ore Pelletization 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 grate-kiln setup. Particles and deposits were sampled from 3 positions of different temperature via a water-cooled sampling probe. Three distinct fragmentation modes were identified based on the aerodynamic particle diameter (Dp). The fine mode: Particles with 0.03   10 μm). A transition from a bimodal PSD (particle size distribution) to a trimodal PSD was observed when Pellet dust was added (Case 3) and consequently the elemental bulk composition of the abovementioned modes was changed. The most extensive interaction between Pellet dust and coal-ash particles was observed in the coarse mode where a significant number of coal ash globules were found attached to the surface of the hematite particles. The morphology of the sharp-edged hematite particles was changed to smooth-edged round particles which proved that hematite particles must have interacted with the surrounding aluminosilicate glassy phase originating from the coal ash. The short-term deposits collected during coal combustion (Case 1) were highly porous in contrast to the high degree of sintering observed in the experiments with Pellet dust addition (Case 3) which is attributed to the dissolution of hematite particles in the aluminosilicate glassy phase. The results suggest that Pellet dust itself (Case 2) has low slagging tendency, independent of temperature. However, when coal-ash is present (Case 3), auxiliary phases are added such that tenacious particles are formed and slagging occurs.