Predicition of Stable and Unstable Flows in Blast Furnace Raceway Using Numerical Simulation Methods for Gas and Particles

Yuu, Shinichi; Umekage, Toshihiko; Miyahara, Takafusa

doi:10.2355/isijinternational.45.1406

Cited by 47 publications

(43 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As solid particles are best considered discrete entities, CCDM is considered suitable for the study of the gas-solid flow. [18][19][20][21]59,60) Figure 5(a) shows a comparison between CCDM results and experimental measurements. 60) When gas is laterally blasted into 2-D packed bed, a cavity can form in front of the gas inlet, which is characterized by a central high void region with some particles circulating in the cavity.…”

Section: Ccdm Approachmentioning

confidence: 99%

“…Attempts have been made to extend the CCDM approach to consider heat and mass transfer, 20) and raceways with more realistic geometry. 21) Figure 6 shows CCDM calculations when chemical reactions and heat transfer in a raceway are considered. The shape and size of a raceway are calculated for both all coke operation and PCI operation, and compared with measurements from a high-temperature coke bed experiment.…”

Section: Ccdm Approachmentioning

confidence: 99%

“…23) Deficiencies in these studies are inherited in mathematical modelling, including, for example, the ignorance of the static holdup, the use of a relatively simple packing structure, and different interaction force equations. In order to overcome these deficiencies, various experimen-tal 24,40,[100][101][102][103][104] and numerical 21,38,[40][41][42]96,[105][106][107][108][109] efforts have been made by various investigators in recent years.…”

Section: Gas-powder Flowmentioning

confidence: 99%

“…In the past decade or so, significant progress has been made to overcome these deficiencies, mainly as a result of the rapid development of computer and computational technologies. For example, mathematical models have been developed to describe the localized flow of liquids in the cohesive zone and deadman, 16,17) solid flow in the raceway and down to the furnace hearth, [18][19][20][21][22] abnormal flows such as burden hanging, 23) powder flow and accumulation, 24) and liquid flooding. 25) Process modelling has also been developed rapidly: now the BF ironmaking can be modelled as a three-dimensional transient process.…”

Section: Introductionmentioning

confidence: 99%

“…In the first treatment, inter-particle interaction and influence of powder phase on conveying fluid are ignored so that the ISIJ International, Vol. 47 (2007) ...... (5) The second treatment is based on the combination of a hard sphere model and direct simulation using the Monte Carlo method, 21,106) in which the field of real particles is represented by a field of sampled particles so that the computational time is reduced significantly. This differs from the above discrete element approach in that collisions between sampled particles are determined by the collision probability which needs to be determined a priori.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Modelling of Multiphase Flow in a Blast Furnace: Recent Developments and Future Work

et al. 2007

View full text Add to dashboard Cite

An ironmaking blast furnace is a complex multiphase flow reactor involving gas, powder, liquid and solid phases. Understanding the flow behaviour of these phases is of paramount importance to the control and optimization of the process. Mathematical modelling, often coupled with physical modelling, plays an important role in this development. Yagi 1) gave a comprehensive review of the early studies in this area in 1993. Significant progress has since been made, partially driven by the needs in research but mainly as a result of the rapid development of computer and computational technologies. This paper reviews these developments, covering the formulation, validation and application of mathematical models for gas-solid, gas-liquid, gas-powder and multiphase flows. The need for further developments is also discussed.KEY WORDS: ironmaking; blast furnace; multiphase flow; two fluid model; discrete element method. Review development. Mathematical ModellingGenerally speaking, the existing approaches to modelling the multiphase flow in a BF can be classified into two categories: continuum approach at a macroscopic level and discrete approach at a microscopic level. In the continuum approach, phases are generally considered as fully interpenetrating continuum media and described by separate conservation equations with appropriate constitutive relations and interaction terms representing the coupling between phases. The general governing equations are based on the so-called two fluid model (TFM), originally developed for gas-particle flow, [29][30][31] given by:Conservation The so-called Model A and Model B result from the treatment of the fluid pressure. For example, for gas-solid flow, Model A assumes the pressure is shared between the two phases, while in Model B, the pressure is attributed to gas phase only. 31) Model A formulation has been widely used in multiphase modelling, especially in process metallurgy. Model B formulation was recently used in the so called combined continuum and discrete method for coupled flow of continuum fluid and discrete particles. 32) The continuum approach is suitable for process modelling and applied research because of its computational convenience and efficiency. Indeed, most of the BF modelling is based on this approach. However, its effective use heavily depends on constitutive or closure relations and the momentum exchange between phases. For Newtonian fluids (gas and liquid here), these relations can be readily determined. For non-Newtonian fluids such as solids and powder, general theories are not yet available. In the past, various theories have been devised for different flow regimes (three flow regimes have been identified: quasi-static regime, rapid flow regime and a transitional regime that lies inbetween). For example, models have been proposed to derive the constitutive equations for the rate-independent deformation of granular materials based on either the plasticity theory or the double shearing theory; the rapid flow of granular materials has been described by extend...

show abstract

Section: Ccdm Approachmentioning

confidence: 99%

Section: Ccdm Approachmentioning

confidence: 99%

Section: Gas-powder Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Modelling of Multiphase Flow in a Blast Furnace: Recent Developments and Future Work

et al. 2007

View full text Add to dashboard Cite

show abstract

Discrete particle modeling of lateral jets into a packed bed and micromechanical analysis of the stability of raceways

Hou

Dianyu

2016

AIChE Journal

View full text Add to dashboard Cite

Gas jets are often used to promote heat and mass transfer by forming raceways or circulating regions in a packed bed. Such an operation is common and critical in many processes. Multiple raceways can interact and be affected by the formation of different flow zones. This work develops a multiscale model to examine the formation and the stability of raceways and the underlying micromechanics. Four states are observed in the fluidized flow regime. More fundamentally, a critical bed width for the observation of different flow zones and states is found through numerical simulations and a theoretical analysis. Finally, the complicated transitions between different flow states are examined at a bed scale, and two general trends of the averaged solid velocity are found. The findings from the multiscale model are useful both scientifically for the understanding of state transitions and practically for the design and the operation of relevant chemical reactors. © 2016 American Institute of Chemical Engineers AIChE J, 62: 4240–4250, 2016

show abstract

Optimization of Ironmaking Blast Furnace Operations Using an Integrated Mathematical Model

Liu

Kuang

Guo

et al. 2022

Chemie Ingenieur Technik

View full text Add to dashboard Cite

Ing. Joachim Werther on the occasion of his 80th birthdayOptimization of ironmaking blast furnaces (BFs) must consider bottom and top operations. This is done by a recently developed integrated BF model covering the BF below the burden surface. Key operating parameters are focused, viz. coal rate, oxygen enrichment, blast temperature, and burden central opening extent. Numerical orthogonal experiments are thus conducted. Fitting the simulation data yields a set of empirical correlations predicting BF performance indicators. After the fitting accuracy test, the correlations are used for multi-objective optimization and operatable zone identification.

show abstract

Predicition of Stable and Unstable Flows in Blast Furnace Raceway Using Numerical Simulation Methods for Gas and Particles

Cited by 47 publications

References 18 publications

Modelling of Multiphase Flow in a Blast Furnace: Recent Developments and Future Work

Modelling of Multiphase Flow in a Blast Furnace: Recent Developments and Future Work

Discrete particle modeling of lateral jets into a packed bed and micromechanical analysis of the stability of raceways

Optimization of Ironmaking Blast Furnace Operations Using an Integrated Mathematical Model

Contact Info

Product

Resources

About