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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, Yngve Ogren, A V Sepman, Bo Lindblom, 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...

  • Combustion Evaluation of Renewable Fuels for Iron-Ore Pellet Induration
    Energy & Fuels, 2019
    Co-Authors: Henrik Wiinikka, Yngve Ogren, A V Sepman, Bo Lindblom, 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 r...

  • 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, Andreas Lennartsson, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Bo Lindblom, Henrik Wiinikka, Marcus Öhman
    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, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Bo Lindblom, Henrik Wiinikka, Marcus Öhman
    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: Anna-lena Ljung, Daniel Marjavaara, Bo Lindblom, Staffan Lundstrom, U. Sjostrom, 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 ...

Marcus Öhman - 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, Yngve Ogren, A V Sepman, Bo Lindblom, 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...

  • Combustion Evaluation of Renewable Fuels for Iron-Ore Pellet Induration
    Energy & Fuels, 2019
    Co-Authors: Henrik Wiinikka, Yngve Ogren, A V Sepman, Bo Lindblom, 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 r...

  • 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, Andreas Lennartsson, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Bo Lindblom, Henrik Wiinikka, Marcus Öhman
    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, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Bo Lindblom, Henrik Wiinikka, Marcus Öhman
    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, Marta-lena 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 ...

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, Yngve Ogren, A V Sepman, Bo Lindblom, 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...

  • Combustion Evaluation of Renewable Fuels for Iron-Ore Pellet Induration
    Energy & Fuels, 2019
    Co-Authors: Henrik Wiinikka, Yngve Ogren, A V Sepman, Bo Lindblom, 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 r...

  • 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, Andreas Lennartsson, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Bo Lindblom, Henrik Wiinikka, Marcus Öhman
    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, Johanne Mouzon, Iftekhar Uddin Bhuiyan, Bo Lindblom, Henrik Wiinikka, Marcus Öhman
    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, Dan Boström, Henrik Wiinikka, Marcus Öhman
    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 ...

Tao Jiang - One of the best experts on this subject based on the ideXlab platform.

  • initial stage of deposit formation process in a coal fired grate rotary kiln for iron Ore Pellet production
    Fuel Processing Technology, 2018
    Co-Authors: Shuai Wang, Fuqiang Zheng, Yu He, Feng Chen, Tao Jiang, Lingzhi Yang
    Abstract:

    Abstract Serious deposits in the grate-kiln plant for iron Ore Pellet production can decline Pellets quality and reduce production efficiency. The initial stage of deposit formation is crucial for adhesion and growth of deposit on refractories in the kiln. In this study, the simulated experiments of FeO formation indicated that the high FeO content decreased with increasing the roasting time. The effects of combustion efficiency of pulverized coal and Na2O amount on the adhesion on the refractory bricks were experimentally studied using an evaluated method. The results showed that the adhesion on the refractory bricks increased with decreasing the combustion efficiency of pulverized coal and increasing the Na2O content in the deposits. Finally, the mechanism of deposit formation mainly on the center-entrance area in the kiln was summarized as follows: the pulverized Pellet powder and coal ash with unburnt carbon fell into the pOres and cracks of the refractory bricks in the kiln. The unburnt carbon and alkali metal chemically reacted with the Pellet powder and contributed to the formation of low-melting-point phases (fayalite, silicate), then the generated low melting point phases plus the chemical reactions between the deposits and refractory bricks caused the adhesion of deposits on the refractory bricks. The deposits grew and became thicker as the continuous effects of the above process.

  • effect of coal ash on ring behavior of iron Ore Pellet powder in kiln
    Powder Technology, 2018
    Co-Authors: Qiang Zhong, Yongbin Yang, Qian Li, Tao Jiang, Bin Xu
    Abstract:

    Abstract Ring formation as a troublesome problem for grate-kiln production of iron-Ore oxide Pellet makes the quality of Pellet declining, production efficiency reducing, and production cost increasing. Pellet powder and coal ash are the raw material of ring. Bonding strength, microstructure and composition of coal ash, iron-Ore Pellet powder, and their mixed powder were investigated to analyze the effect of coal ash on ring behavior of Pellet powder and observe the forming of powder ring in kiln. Results showed that coal ash not only changes chemical composition of Pellet powder, but also influences its bonding process. The proportion of hematite decreases while that of mullite and quartz increases with the rise of coal ash. High temperature (not less than 1250 °C) is a necessary condition to make powder form ring. Fe2O3 recrystallization of Pellet powder is the primary manner for powder briquettes. Pure Pellet powder is difficult to form ring because of its insufficient Fe2O3 recrystallization at beginning of formation, but their weak bonding can be intensified by coal ash. The combined actions of glassy phase silicide, liquation phase aluminosilicate and liquid phase of low melting substance make the ash briquette with tight structure and high strength in the initial of roasting which is difficult to be destroyed and maintain in rotary kiln as the original ring. Then with the continuous of high temperature roasting, sufficient Fe2O3 recrystallization makes the original ring further strong and unbreakable, and evolve to the final ring which is indestructible and malignant.

  • iron Ore Pellet disintegration mechanism in simulated shaft furnace conditions
    Powder Technology, 2017
    Co-Authors: Lingyun Yi, Zhucheng Huang, Ronghai Zhong, Tao Jiang, Zhikai Liang
    Abstract:

    Abstract The disintegration behavior and mechanism of iron Ore Pellet in simulated shaft furnace conditions were investigated in details. Effects of temperature, reducing gas and gangue compositions were emphatically discussed. It was found that Pellet disintegrated acutely as reduced by H2/CO = 0.8 at 550 °C. Gangue minerals in Pellet were proved to ease the disintegration in various degrees. SiO2 or CaO could remarkably lower reduction disintegration index (RDI). But the effect of MgO or Al2O3 was much weaker. FurthermOre, intrinsic relation between disintegration and reduction was revealed from microstructure aspect. Results demonstrated that lattice transition stress and crack generation brought about by the low temperature reduction led to Pellet structure failure and therefOre disintegration. The reduction degree showed positive correlation with disintegration level of Pellet. Low melting point phase formed by SiO2 or CaO lessened crack formation in Pellet. However, MgO or Al2O3 could not play a similar role.

  • cohering behavior of iron Ore Pellet powder in kiln by a novel natural stacking method
    2017
    Co-Authors: Yongbin Yang, Qian Li, Yan Zhang, Bin Xu, Tao Jiang
    Abstract:

    The cohering behavior of iron Ore Pellet powder in kiln cannot be reflected entirely through the conventional briquetting method, so a novel natural stacking method was proposed in this paper. The results showed that in the two methods the cohering strength of powders from different iron Ore Pellets (numbered A, B and C) rose with the increase of roasting time and temperature and presented the same result, i.e., C > B > A. Comparatively, the natural stacking powders obtained much lower cohering strengths under the same roasting condition. The structure analyses of ring from the kiln tail and cohering briquette by the natural stacking method indicated that the occurrence of crystallized particles of them were extremely similar. TherefOre, the initial information of Pellet powder’s cohering behavior could be provided by the natural stacking method, improving the methods to study the actual ringing process and mechanism of Pellet powders in kiln.

  • combustion reaction of pulverized coal on the deposit formation in the kiln for iron Ore Pellet production
    Energy & Fuels, 2016
    Co-Authors: Shuai Wang, Feng Chen, Yu He, Tao Jiang, Fuqiang Zheng
    Abstract:

    The serious deposits on the refractory bricks are found in the grate kiln in iron Ore Pellet plants, which significantly influence the Pellet production. The effect of the combustion reaction of pulverized coal on the deposit formation in kiln during iron Ore Pellet production was investigated in this work. Hematite iron Ore was used as raw material to be Pelletized, and the pulverized coal, in general, was used as the fuel. The chemical compositions and microstructures of the deposit samples were detected through the chemical analysis methods, scanning electron microscopy, and energy-dispersive spectroscopy. Effects of different residual carbon contents in coal ash and roasting temperature on the deposit formation were investigated by simulated experiments. Then, the results indicated that the combustion reaction of coal had a significant influence on the deposit formation, under which condition the hematite grains in the preheated Pellet were reduced by surrounding residual carbon particles in unburned ...