- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
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The flow pattern of solids established in large-scale circulating fluidized bed (CFB) furnaces is of great importance for the performance of commercial CFB boilers, as it governs the heat transfer and mixing of the fuel and any other reactive solids. The solids flow pattern in the riser is crucial for the design and scaling up of large-scale CFB …
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Circulating fluidized bed (CFB) combustion is carried out at higher gas velocities than are used in the traditional bubbling fluidized bed combustors. Thus, CFB combustors offer higher specific thermal power while entailing significant solids flows throughout the furnace.
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The future of circulating fluidized bed (CFB) combustion technology is in raising the steam parameters to supercritical levels. Understanding the heat flux distribution on the water wall is one of the most important issues in the design and operation of supercritical pressure CFB boilers. In the present paper, the finite element analysis …
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Heat transfer to wall panels in the furnace of a circulating fluidized bed (CFB) was investigated by means of a mathematical model in combination with measurements obtained from a 4–MW th CFB unit operated under air and oxy-fuel firing conditions. The conditions at the wall panels corresponded to a concentration of solids in …
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By means of pre-reduction of iron ore fines, productivity of a blast furnace can be increased and iron ore unsuitable for sintering process can be easily used in the blast furnace. As a pre-reduction process a circulating fluidized bed (CFB) has been developed with a pilot plant. The riser of CFB is 550 mm in inside diameter and 10 m in …
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Circored consisted of a series of fluidized bed reactors consisting of one oxidizing circulating fluidized bed, one reducing circulating fluidized bed, and a final reducing bubbling fluidized bed. The final reduction occurred at a temperature of 650 °C and a pressure of 4 barg. MgO was added at a rate of 4.2 kg/ton HBI as an anti-sticking …
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The fluid dynamics in the furnaces of large-scale circulating fluidized bed (CFB) boilers are surprisingly little known in contrast to the many laboratory studies made on conditions related to chemical reactors. Two areas are surveyed in the present work: the bottom bed and the upper dilute zone of a furnace.
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Issue entitled "Operation Optimization of Circulating Fluidized Bed Boilers Integration of Variable Renewables", we provide a comprehensive view of the efforts to improve the operation of CFB boilers from different aspects to raise research interest in this topic. This Special Issue on "Operation Optimization of Circulating Fluidized Bed ...
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Properties of coal gangue feed, especially its particle size distribution (PSD) and variable hardness, result in considerable impacts on both the efficiencies of the circulating fluidized bed (CFB) boiler and wastage of crushers.
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A coal-fired circulating fluidized bed (CFB) boiler for 600 MW power plant is designed to integrate with the supercritical CO 2 (S CO 2) power cycle in this study.The boiler configuration, heating surface arrangement and regulation analysis were figured out based on the First Law of Thermodynamics and the basic rules of heat transfer.
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Using data from large CFB boilers, and taking average solids concentration, size and height of the boiler-furnace as variables, a correlation for fractional wall coverage has been developed. This correlation for wall coverage and several other refinements have been used to modify the cluster renewal model of heat transfer. Predicted heat transfer …
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Gasifiers are broadly classified into fluidized, fixed, and entrained bed gasifiers. Fluidized bed gasifiers, especially circulating fluidized bed gasifiers (CFBG), has major advantages over other gasifiers, such as, fuel-flexibility, high heat and mass transfer rates, high efficiency, lower emissions etc.
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ABSTRACT In this study, a three-dimensional computational fluid dynamics (CFD) model is employed to investigate the hydrodynamic and combustion characteristics of biomass particles in an industrial-scale circulating fluidized bed (CFB) furnace. The CFD model considered here is based on the Eulerian-Lagrangian framework, the multi-phase …
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The term "fluidized bed" obviously refers to fluid dynamics in an intensively mixed system of solid particles and gas flow which keeps the particles in dynamic movement. Different systems can be described according to observation of the technical behavior as "bubbling," "turbulent," or "circulating" fluidized bed.
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Circulating Fluidized Bed (CFB) combustion boilers gives the flexibility for combustion of a wide range of coals and alternative fuel sources. All this without compromising efficiency and with reduced emissions. This article gives a brief description of the working of a CFB boiler. At the bottom of the boiler furnace there is a bed of inert material. Bed is where …
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Circulating fluidized bed (CFB) technology was applied for coal combustion after CFB chemical reactors have been widely used and studied in chemical engineering.However, there were still many special phenomena found in the CFB boiler.In this paper, the main differences between a conventional CFB reactor and a CFB boiler …
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