Improved equation for the calculation of minimum fluidization velocity

Lucas, A.; Arnaldos, Josep; Casal, Joaquim; Puigjaner, L.

doi:10.1021/i200033a013

Cited by 87 publications

(44 citation statements)

References 1 publication

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“…This shows that the ANN model developed in this study predicts U mf better than the existing correlations. Wen and Yu (1966) 0.9661 0.9467 Bourgeois and Grenier (1968) 0.9628 0.9501 Saxena and Vogel (1977) 0.9572 0.9483 Babu et al (1978) 0.9550 0.9470 Richardson and Jeronimo (1979) 0.9635 0.9500 Grace (1982) 0.9635 0.9500 Thonglimp et al (1984) 0.9654 0.9486 Chitester et al (1984) 0.9627 0.9501 Nakamura et al (1985) 0.9657 0.9481 Zheng et al (1985) 0.9573 0.9484 Lucas et al (1986) 0.9656 0.9483 Tannous (1993) 0.9618 0.9501…”

Section: Neural Network Model For Predicting the U Mfmentioning

confidence: 99%

A comparative hydrodynamic study of two types of spouted bed reactor designs

Salam

Bhattacharya

2006

Chemical Engineering Science

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Section: Neural Network Model For Predicting the U Mfmentioning

confidence: 99%

A comparative hydrodynamic study of two types of spouted bed reactor designs

Salam

Bhattacharya

2006

Chemical Engineering Science

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“…A correlation to bring out the effect of distributor apex angle α on fluidisation quality has been developed and presented in this paper. The correlation has been validated with that of Antoni Lucas et al [1]. The average deviation and standard deviations of the correlation are 6.8 and 27%, respectively.…”

mentioning

confidence: 69%

Effect of Conical Distributor Parameters on the Fluidisation Characteristics of Cylindrical Fluidised Bed Reactors

Rao

Reddy

Prasad

2009

Indian Chemical Engineer

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Integrated gasification combined cycle (IGCC) is one of the most advanced power generation technologies. The normal approach to design a commercial size pressurised fluidised bed gasifier (PFBG) for IGCC is based on large-scale pilot plant experimentation or scale-up of hydrodynamically similar cold model. The conical distributor is a critical component of PFBG, which affects the hydrodynamic performance of the fluidiser. A correlation to bring out the effect of distributor apex angle α on fluidisation quality has been developed and presented in this paper. The correlation has been validated with that of Antoni Lucas et al. [1]. The average deviation and standard deviations of the correlation are 6.8 and 27%, respectively. The experimental results show that minimum fluidising velocity increases with increase in α. The bed voidage derived from Ergun's equation is found to decrease with increase of α indicating better fluidisation quality. This paper aims to study the fluidisation characteristics of cylindrical fluidised bed reactors with varying apex angle of conical distributor and derive a correlation of Reynolds number at minimum fluidising velocity as a function of Archimedes number and apex angle of the distributor.

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“…[14,15,22] The correlations and parameters used in hydrodynamic modeling are also derived from literature. [23][24][25][26] Furthermore, Table 4-6 show the characteristic parameters of the SanchezLacombe equation of state. [18,19,27,28] The simulation results and their corresponding patent data including the production rate, weight percentage of liquid in the inlet stream to the reactor as well as the melt flow index (MFI) and density of polyethylene resins are shown in Table 7.…”

Section: Resultsmentioning

confidence: 99%

Fluidized Bed Polyethylene Reactor Modeling in Condensed Mode Operation

Mirzaei

Kiashemshaki

Emami

2007

Macromolecular Symposia

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Summary: Modeling of fluidized bed reactor for polyethylene production in the condensed mode operation is proposed in this paper. A two-phase model including the emulsion and bubble phases with the constant bubble size is employed to describe hydrodynamic behavior of the reactor. The kinetics of Ziegler-Natta polymerization is also modeled with a two active site model. The phase behavior and solubility of low molecular weight components in polyethylene are estimated with the Sanchez-Lacombe equation of state. The validation of the model is carried out with industrial data for an ethylene and 1-butene copolymerization with the isopentane as a condensable component. The simulation results are in good agreement with industrial data. The model is also used to study quantitatively the effect of the inlet stream temperature to the reactor and isopentane concentration in the reactor on the production rate. For instance, in a typical process, when the inlet stream temperature changes 10 8C, the production rate will alter about 40%. Furthermore, the change of the isopentane concentration around 1 mole percentage leads to a variation of production rate about 14%.

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Improved equation for the calculation of minimum fluidization velocity

Cited by 87 publications

References 1 publication

A comparative hydrodynamic study of two types of spouted bed reactor designs

A comparative hydrodynamic study of two types of spouted bed reactor designs

Effect of Conical Distributor Parameters on the Fluidisation Characteristics of Cylindrical Fluidised Bed Reactors

Fluidized Bed Polyethylene Reactor Modeling in Condensed Mode Operation

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