Two-dimensional computational fluid dynamics simulation of coal combustion in a circulating fluidized bed combustor

Zhou, Weizheng; Zhao, Changsui; Duan, Lunbo; Qu, Chengrui; Chen, X.P.

doi:10.1016/j.cej.2010.09.048

Cited by 81 publications

(41 citation statements)

References 37 publications

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“…In the past, efforts were made to develop models for the multiphase flow of coupled gas and granular fluids because of their importance for practical problems, such as coal combustors (Zhou et al 2011), catalytic bed reactors (Zimmermann & Taghipour 2005), biomass gasification (Gerber, Behrendt & Oevermann 2010), particle hoppers (Srivastava & Sundaresan 2003), scouring sand underneath submerged pipes (Zhao & Fernando 2007) and pyroclastic flows (Neri et al 2003). A number of methods have been developed to study these essentially low-speed incompressible flow problems (as described in § 2).…”

Section: Introductionmentioning

confidence: 99%

A multiphase model for compressible granular–gaseous flows: formulation and initial tests

2016

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A model for predicting the behaviour of a compressible flow laden with shocks interacting with granular material has been developed and tested. The model consists of two sets of coupled Euler equations, one for the gas phase and the other for the granular phase. Drag, convective, heat transfer and non-conservative terms couple the two sets of governing equations. Intergranular stress acting on the grains is modelled using granular kinetic theory in dilute regimes where particle collisions are dominant and frictional-collisional pressure in dense regions where layers of granular material slide over one another. The two-phase granular-gaseous model, as a result, is valid from dilute to densely packed granular regimes. The solution of these nonlinearly coupled Euler equations is challenging due to the presence of the non-conservative nozzling and work terms. A numerical technique, based on Godunov's method, was designed for solving these equations. This method takes advantage of particle incompressibility to simplify the nozzling terms. It also uses the observation that a Riemann problem is valid in the region where gas can flow between particles and can be used to provide a physically accurate approximation of the non-conservative terms. The model and solution method are verified by comparisons to test problems involving granular shocks and two-phase shock-tube problems, and they are validated against experimental measurements of shock and dense particle-curtain interactions and transmitted oblique granular shocks.

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Section: Introductionmentioning

confidence: 99%

A multiphase model for compressible granular–gaseous flows: formulation and initial tests

2016

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“…Carbon oxide generation: The reaction rates R1-R9 and reaction-rate constants are given in Table 1; they are similar to those given in Zhou et al [19] and in CD-Adapco methodology [29].…”

Section: Mathematical Formulationmentioning

confidence: 97%

“…Thus, CFD is an indispensable analysis and design tool for an increasing number of applications. Several compendiums on CFD fluidized-bed coal studies may be consulted for further descriptions of previous contributions [17][18][19][20][21][22]. Summarily, an excellent review and overview of oxy-fuel coal-combustion technology was presented in [23,24].…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics simulation of Lafia–Obi bituminous coal in a fluidized-bed chamber for air- and oxy-fuel combustion technologies

Amoo

2015

Fuel

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“…DEM-CFD の連成に関わるシミュレーション手法は，一般的な固気流動層の流れ挙動に関する現象解明や産業界における装置設計に応用し始められている。しかし，粉体の挙動に加え，化学反応や伝熱を考慮した工業生産スケールでの研究はほとんどなく [8,9] Coarse-grained model for DEM 790 粉体工学会誌原料粒子および微粉炭粒子のエネルギー保存式は Eq. Comparison between measured and calculated O 2 concentration in Case 1 Comparison between measured and calculated CO concentration in Case 1 Comparison between measured decarbonation rates in Case 1 and Case 2 …”

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DEM-CFD Numerical Simulation and Actual Verification of Fluidized Bed Calciner for Cement Production

Wang¹,

Takayama²,

Shima³

2017

Funtai Kogakkaishi

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A numerical calculation method of the fluidized bed calciner for cement production including pulverized coal combustion, raw material decarbonation reaction and heat transfer was developed using the coupling simulation method of DEM -CFD (Discrete Element Method -Computational Fluid Dynamics). In addition, in order to shorten the calculation time, a coarse-grained model for DEM was used in the DEM-CFD. Based on this, the influence of the position and the number of pulverized coal blowing lines into the calciner on the characteristics of pulverized coal combustion and the property of raw material decarbonation was investigated. As a result, a modification plan to change pulverized coal blowing lines to promote pulverized coal combustion and raw material decarbonation was found from the calculation results, and the position and the number of pulverized coal blowing lines were changed from a single pulverized coal blowing line to two blowing lines in a commercial manufacture system. Then, the modified effectiveness and the validity of the numerical calculation method were verified by measuring actual gas composition and temperature distribution in the calciner before and after modifying.

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Two-dimensional computational fluid dynamics simulation of coal combustion in a circulating fluidized bed combustor

Cited by 81 publications

References 37 publications

A multiphase model for compressible granular–gaseous flows: formulation and initial tests

A multiphase model for compressible granular–gaseous flows: formulation and initial tests

Computational fluid dynamics simulation of Lafia–Obi bituminous coal in a fluidized-bed chamber for air- and oxy-fuel combustion technologies

DEM-CFD Numerical Simulation and Actual Verification of Fluidized Bed Calciner for Cement Production

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