Modelling of circulating fluidized bed combustion of a char

Arena, Umberto; Malandrino, Alberto; Massimilla, L.

doi:10.1002/cjce.5450690407

Cited by 26 publications

(24 citation statements)

References 11 publications

(11 reference statements)

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“…On the contrary, much lower combustion efficiencies than those predicted with the above equations are predicted when using the assumption proposed by Arena et al (1991).…”

Section: Discussionmentioning

confidence: 57%

“…T ("C) Figure 11. Predictions of carbon combustion efficiencies in the dense region at different temperatures using various equations for mass transfer: ---, Chakraborty and Howard (1981); *.., Arena et al (1991); -, Halder et al (1993). uo = 7 d s , Exc = 208.…”

Section: (34)mentioning

confidence: 99%

“…The shrinking unreacted core model, with a mixed control by chemical reaction and _ _ - Chakraborty and Howard (1981); . a * , Arena et al (1991);…”

Section: (34)mentioning

confidence: 99%

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Modeling of Carbon Combustion Efficiency in Circulating Fluidized Bed Combustors. 1. Selection of Submodels and Sensitivity Analysis

Adánez¹,

Diego²

1995

Ind. Eng. Chem. Res.

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The application of a specific model to coal combustion in circulating fluidized beds presents the initial difficulty of having to choose between the different submodels proposed in the literature, where some important discrepancies exist. Therefore, in this work a sensitivity analysis of the carbon combustion efficiency predictions to the different hypotheses, equations, and parameters defining the different submodels has been carried out. Thus, it has been found that the hypotheses related to the radial and axial solid distributions and the possible combustion of the descending char particles in the annulus exercise a n important effect on the predictions when low-reactivity coals were considered, its importance being lower with high-reactivity coals. The same occurs when modifying parameters or equations referring to the reactivity of the char or to the mass transfer around particles. However, those corresponding to the devolatilization type have no significant effect on the efficiency predictions. On the other hand, however, it has been found that the hypotheses of the type of gas flow in the dense region has a medium sensitivity on the carbon combustion efficiencies.

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“…On the contrary, much lower combustion efficiencies than those predicted with the above equations are predicted when using the assumption proposed by Arena et al (1991).…”

Section: Discussionmentioning

confidence: 57%

Section: (34)mentioning

confidence: 99%

See 1 more Smart Citation

Modeling of Carbon Combustion Efficiency in Circulating Fluidized Bed Combustors. 1. Selection of Submodels and Sensitivity Analysis

Adánez¹,

Diego²

1995

Ind. Eng. Chem. Res.

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“…This phenomenon is enhanced by combustion and also by gasification. Attrition and percolation have been studied for different fuels and different conditions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Attrition enhances the combustion rate of a single char particle by removing small fragments from the surface.…”

Section: Introductionmentioning

confidence: 99%

Model for attrition-enhanced char combustion in fluidized beds

Saastamoinen

2016

Fuel Processing Technology

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“…For example, limestone can be added to capture sulphur and prevent its release to the atmosphere as sulphur dioxide. In the past, researches had been conducted to model the combustion process in the CFB [3][4][5]. These researches show that technical knowledge about design and operation of CFB is widely available, but little has been done in the field of mathematical modeling of combustion in the CFB [2].…”

Section: Introductionmentioning

confidence: 99%

Modified graphical autocatalytic set model of combustion process in circulating fluidized bed boiler

Yusof

Bakar

Ismail

2014

AIP Conference Proceedings

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Articles you may be interested inSimulation of hydrodynamics using large eddy simulation-second-order moment model in circulating fluidized beds AIP Conf.Design and construction of a circulating fluidized bed combustion facility for use in studying the thermal remediation of wastes Rev. Sci. Instrum. 65, 2704 (1994); 10.1063/1.1144673Hydration process for enhanced calcium utilization in fluidized-bed combustion AIP Conf.Abstract. Circulating Fluidized Bed Boiler (CFB) is a device for generating steam by burning fossil fuels in a furnace operating under a special hydrodynamic condition. Autocatalytic Set has provided a graphical model of chemical reactions that occurred during combustion process in CFB. Eight important chemical substances known as species were represented as nodes and catalytic relationships between nodes are represented by the edges in the graph. In this paper, the model is extended and modified by considering other relevant chemical reactions that also exist during the process. Catalytic relationship among the species in the model is discussed. The result reveals that the modified model is able to gives more explanation of the relationship among the species during the process at initial time t.

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Modelling of circulating fluidized bed combustion of a char

Cited by 26 publications

References 11 publications

Modeling of Carbon Combustion Efficiency in Circulating Fluidized Bed Combustors. 1. Selection of Submodels and Sensitivity Analysis

Modeling of Carbon Combustion Efficiency in Circulating Fluidized Bed Combustors. 1. Selection of Submodels and Sensitivity Analysis

Model for attrition-enhanced char combustion in fluidized beds

Modified graphical autocatalytic set model of combustion process in circulating fluidized bed boiler

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