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fluidized bed accumulation

Numerical study on the effect of fine coal accumulation in ...

01/10/2015  One important phenomenon in coal beneficiation fluidized bed (CBFB) is the accumulation of fine coal particles in beneficiation due to poor screening efficiency and attrition of coal samples. The effect of fine coal accumulation is numerically studied in this work using a TFM–DEM hybrid model. The gas phase and medium solid phase are modeled by a two-fluid model (TFM), while

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Fluidized Bed Reactor Technology in Sewage Treatment

ClearFox FBS (fluidized bed system) small sewage treatment plant with fluidized bed reactor. The FBS is a small sewage treatment plant of the latest generation, operating according to the fluidised bed process. The natural wastewater accumulation flows freely through the plant. An integrated restriction makes sure that the flow is equalised in order to optimise the physical and biological ...

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Fluidized bed combustion - Wikipedia

Fluidized bed combustion (FBC) is a combustion technology used to burn solid fuels. In its most basic form, fuel particles are suspended in a hot, bubbling fluidity bed of ash and other particulate materials (sand, limestone etc.) through which jets of air are blown to provide the oxygen required for combustion or gasification. The resultant fast and intimate mixing of gas and solids promotes ...

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Stimulating accumulation of nitrifying bacteria in porous ...

Stimulating accumulation of nitrifying bacteria in porous carrier by addition of inorganic carbon in a continuous-flow fluidized bed wastewater treatment reactor. Jun BH(1), Tanji Y, Unno H. Author information: (1)Department of Biotechnology, School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan. Porous polyurethane ...

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Fluidized Bed Reactor Technology in Sewage Treatment

The FBS is a small sewage treatment plant of the latest generation, operating according to the fluidised bed process. The natural wastewater accumulation flows freely through the plant. An integrated restriction makes sure that the flow is equalised in order to

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Reduction of electrostatic charges in gas–solid fluidized

01/01/2002  Reduction of electrostatic charge accumulation by increasing the humidity of fluidizing gas was investigated using single bubble injection in two- and three-dimensional fluidized beds. Both 321 μm glass beads and 378 μm polyethylene particles were found to be charged positively when fluidized by air. Electrostatic charges increased as the bubble size increased. Increasing the relative humidity of the fluidizing air to 40–80% reduced the accumulation

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Influence of Volatile Fatty Acids on Nitrite Accumulation ...

Intermediate nitrite accumulation during denitrification by Pseudomonas stutzeri isolated from a denitrifying fluidized bed reactor was examined in the presence of different volatile fatty acids. Nitrite accumulated when acetate or propionate served as the carbon and electron source but did not accumulate in the presence of butyrate, valerate, or caproate. Nitrite accumulation in the presence ...

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Effect of fine coal accumulation on dense phase fluidized ...

Download Citation Effect of fine coal accumulation on dense phase fluidized bed performance System for the dry separation of 50 X 6-mm coal is described. It consists of an air dense-medium ...

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Stimulating accumulation of nitrifying bacteria in porous ...

Stimulating accumulation of nitrifying bacteria in porous carrier by addition of inorganic carbon in a continuous-flow fluidized bed wastewater treatment reactor. Jun BH(1), Tanji Y, Unno H. Author information: (1)Department of Biotechnology, School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan. Porous polyurethane ...

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Gas–powder flow and powder accumulation in a packed

23/11/2004  For one-dimensional flow, several fluid-dynamic models , , , have been proposed for cocurrent gas and powder flow through packed beds. These models are able to describe the overall behavior of such a system, indicating the relationship between powder holdup, fluid velocity and packing properties and quantifying the interactions between phases. For multidimensional flow, based on a

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Bioprocess Control of Sulphate Reduction in an Inverse ...

Bioprocess Control of Sulphate Reduction in an Inverse Fluidized Bed Reactor: Role of Microbial Accumulation and Dynamic Mathematical Modelling book. Bioprocess Control of Sulphate Reduction in an Inverse Fluidized Bed Reactor: Role of Microbial Accumulation and Dynamic Mathematical Modelling . DOI link for Bioprocess Control of Sulphate Reduction in an Inverse Fluidized Bed

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Simulation of Particle Segregation in Fluidized Beds

Apart from assisting fluidization, the bed material can act either as a thermal energy carrier, a catalyst or both. Therefore, the presence of particles having different densities and sizes is a common in fluidized bed combustors and gasifiers since the bed material, biomass and char are fluidized

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Fluidized Bed Combustion FBC Boiler - Boilersinfo

“ (FBC) Fluidized bed combustion is a combustion technology used to burn solid fuels in steam boilers.” In Fluidized Bed Combustion Boiler technology When air or gas is passed through an inert bed of solid particles such as sand supported on a fine mesh or grid, the air initially will seek a path of least resistance and pass upward through the sand. With

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Monitoring of fluidization state during heat recovery from ...

control the slag accumulation height and bed height in fluidized bed heat recovery system. •Total bed height can be determined by measuring pressure at the top part Control of bed material feed. •Slag accumulation height can be determined by measuring pressure fluctuation. Control of withdrawal of accumulated slag. Conclusion

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Influence of Volatile Fatty Acids on Nitrite Accumulation ...

Intermediate nitrite accumulation during denitrification by Pseudomonas stutzeri isolated from a denitrifying fluidized bed reactor was examined in the presence of different volatile fatty acids. Nitrite accumulated when acetate or propionate served as the carbon and electron source but did not accumulate in the presence of butyrate, valerate, or caproate. Nitrite accumulation in the presence of

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Stimulating accumulation of nitrifying bacteria in porous ...

By addition of sodium bicarbonate, the ammonia oxidation reaction proceeded remarkably in the porous particle fluidized bed reactor, while a small increase in the nitrification was observed in a reactor with suspended microbes. Dissolved oxygen profile was obtained using an oxygen microelectrode to measure the microbial consumption of oxygen in the porous carrier. The size of ammonia-oxidizing bacterial

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Numerical study on the effect of fine coal accumulation in ...

One important phenomenon in coal beneficiation fluidized bed (CBFB) is the accumulation of fine coal particles in beneficiation due to poor screening efficiency and attrition of coal samples. The effect of fine coal accumulation is numerically studied in this work using a TFM–DEM hybrid model. The gas phase and medium solid phase are modeled by a two-fluid model (TFM), while the fine coal ...

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Bioprocess Control of Sulphate Reduction in an Inverse ...

Bioprocess Control of Sulphate Reduction in an Inverse Fluidized Bed Reactor: Role of Microbial Accumulation and Dynamic Mathematical Modelling book. Bioprocess Control of Sulphate Reduction in an Inverse Fluidized Bed Reactor: Role of Microbial Accumulation and Dynamic Mathematical Modelling . DOI link for Bioprocess Control of Sulphate Reduction in an Inverse Fluidized Bed

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Estimation of Bubble Properties in Bubbling Fluidized Bed ...

In bubbling fluidized beds, important bubble properties can be estimated using electrical capacitance volume tomography (ECVT). The resolution of ECVT depends on sensor configuration and image reconstruction algorithm. At low resolution, the estimation of bubble size critically relies on threshold solids volume fraction. The majority of previous studies used a constant threshold; however, present

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Computational fluid dynamic modeling of fluidized

Electrostatic charges in gas phase polymerization fluidized bed reactors are known to influence the bed hydrodynamics, particle elutriation, bubble size, bubble shape etc. Accumulation of electrostatic charges in the fluidized-bed can lead to operational issues. In this work a first-principles electrostatic model is developed and coupled with a multi-fluid computational fluid dynamic (CFD) model to understand the effect of electrostatics on the dynamics of a fluidized-bed. The multi-fluid ...

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Combining fluidized IEX and coagulation / flotation for ...

•Fluidized bed IEX reliable enough for full scale application •>80% reduction in coagulant demand •Improved overall NOM removal •Lower mineralisation •Investment cost IEX compensated by decrease in operational costs •Need for further research on waste water treatment Fluidized bed IEX –coagulation –flotation (2011 –2013) European Regional Development Fund WATER. VANDAAG EN ...

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CFD Modeling of Electrostatic Forces in Gas-Solid ...

Electrostatic charges in gas-solid fluidized beds are known to influence the bed dynamics, bubble shape and size, particle agglomeration, segregation and entrainment. In practice, accumulation of electrostatic charges in fluidized beds can lead to operational issues. The present work focuses on the modeling of electrostatics in gas-solid fluidized beds. The particles are assumed to carry a prescribed size

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Monitoring of fluidization state during heat recovery from ...

control the slag accumulation height and bed height in fluidized bed heat recovery system. •Total bed height can be determined by measuring pressure at the top part Control of bed material feed. •Slag accumulation height can be determined by measuring pressure fluctuation. Control of withdrawal of accumulated slag. Conclusion

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Liquid-fluidized-bed heat exchanger design parameters ...

The U.S. Department of Energy's Office of Scientific and Technical Information

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