Effect of Operating Variables on Bed to Wall Heat Transfer in a Circulating Fluidized Bed

Basu, Prabir; Nag, Preetom; Chen, B.H.; Shao, Mingyuan

doi:10.1080/00986448708912040

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…Circulating fluidized bed (CFB) reactors have been utilized extensively in both catalytic and noncatalytic gas-solid reactions, such as in the catalytic cracking of crude oil and the coal combustion and gasification of wood and biomass (Reh, 1986). A number of studies have been conducted on the hydrodynamics (for example, Li and Kwauk, 1980;Hartge et al, 1986;Weinstein et al, 1986;Rhodes and Geldart, 1987), and on heat transfer behavior (Grace, 1986;Basu et al, 1987;Bi et al, 1989;Wu et al, 1990) in the CFB. Relatively few studies, however, have been made on the mass transfer (Halder and Basu, 1988), and reactor design and modeling (Helmrich et al, 1986;Liu, 1989;Sun and Grace, 1990;Grace et al, 1990;Jiang et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

Baffle effects on performance of catalytic circulating fluidized bed reactor

Jiang

Jean

et al. 1991

AIChE Journal

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Section: Introductionmentioning

confidence: 99%

Baffle effects on performance of catalytic circulating fluidized bed reactor

Jiang

Jean

et al. 1991

AIChE Journal

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“…Heat transfer in the furnace of a circulating fluidized bed combustors (CFBC) is a complex phenomenon affected by several factors (Basu and Nag, 1996;Basu et al, 1987;Blaszczuk and Nowak, 2015;Błaszczuk et al, 2014;Komorowski et al, 2015;Kotowicz and Balicki, 2014;Krzywanski and Nowak, 2012;Yang, 2003). Among those are the suspension density, bed temperature and fluidization velocity.…”

Section: Introductionmentioning

confidence: 99%

“…Because they absorb the heat released from fuel combustion in a boiler, the bed-to-wall heat transfer determines the performance of the boiler, and the size of the furnace is a function of the heat transfer coefficient in the furnace. Therefore, knowing the bed-to-wall heat transfer coefficient in the furnace is essential for proper designing of the combustion chamber of a circulating fluidized bed (CFB) boiler (Basu et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

Fuzzy logic and bed-to-wall heat transfer in a large-scale CFBC

Krzywański

Wesołowska

Błaszczuk

et al. 2018

HFF

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Purpose The purpose of this paper is to first present the key features of the fuzzy logic (FL) approach as a cost-effective technique in simulations of complex systems and then demonstrate the formulation and application of the method. Design/methodology/approach The FL approach is used as an alternative method of data handling, considering the complexity of analytical and numerical procedures and high costs of empirical experiments. The distance from gas distributor, the temperature and the voidage of the bed, flue gas velocity and the load of the boiler are the input parameters, whereas the overall heat transfer coefficient for the membrane walls constitutes the output. Five overlapping sigmoid and constant linguistic terms are used to describe the input and the output data, respectively. The Takagi–Sugeno inference engine and the weighted average defuzzification methods are applied to determine the fuzzy and crisp output value, respectively. Findings The performed FL model allows predicting the bed-to-wall heat transfer coefficient in a large-scale 670 t/h circulating fluidized bed (CFB) boiler. The local heat transfer coefficients evaluated using the developed model are in very good agreement with the data obtained in complementary investigations. Originality/value The performed model constitutes an easy-to-use and functional tool. The new approach can be helpful for further research on the bed-to-wall heat transfer coefficient in the CFB units.

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Hydrodynamic behavior of iron ore particles in a circulating fluidized bed reduction system

Hahn

Nam

Park

et al. 1995

Metals and Materials

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Mathematical modeling has been carried out for the hydrodynamic behavior of iron ore particles in a circulating fluidized bed reduction system. The hydrodynamic model incorporates gas-solid, solid-solid, gaswall, and solid-wall interactions. The model predictions were compared with experimental data taken from the literature in terms of solid volume fraction and part!cle size distribution along the axial location under various operating conditions. Good agreement was obtained between the measured and predicted results. The results showed that the fluidization of iron ores in CFB was mainly affected by the superficial gas velocity and the solid circulation rate, while the ore inventory was less important. Hence, for uniform fluidization, the CFB system has to be operated by controlling the superficial gas velocity and the solid circulation rate rather than the ore inventory.

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Effect of Operating Variables on Bed to Wall Heat Transfer in a Circulating Fluidized Bed

Cited by 12 publications

References 7 publications

Baffle effects on performance of catalytic circulating fluidized bed reactor

Baffle effects on performance of catalytic circulating fluidized bed reactor

Fuzzy logic and bed-to-wall heat transfer in a large-scale CFBC

Hydrodynamic behavior of iron ore particles in a circulating fluidized bed reduction system

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