A Theoretical Analysis on Gas Flow and Heat Transfer in Packed Beds with Fused and Unfused Layers

Sugiyama, Takashi; Yagi, Jun‐ichiro; Omori, Yasuo

doi:10.2355/tetsutohagane1955.64.12_1676

Cited by 8 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These studies highlight the complex softening-melting behavior, which include the variation of permeability and strong horizontal gas and liquid flows in the CZ. Moreover, efforts have been made to establish the relationship among permeability, fluid flow, and heat transfer in this zone, [21][22][23] which resulted in the development of several empirical and semiempirical CZ models. Among them, the so-called ZAP model [24] shows the capability to predict the shape and position of the CZ partially based on online measured data and on summarized relationships between process parameters and CZ characteristics.…”

Section: An Ironmaking Blast Furnace (Bf) Is a Multiphasementioning

confidence: 99%

Modeling of Blast Furnace with Layered Cohesive Zone

Dong

Chew³

et al. 2010

Metall Mater Trans B

119

View full text Add to dashboard Cite

An ironmaking blast furnace (BF) is a moving bed reactor involving counter-, co-, and crosscurrent flows of gas, powder, liquids, and solids, coupled with heat exchange and chemical reactions. The behavior of multiple phases directly affects the stability and productivity of the furnace. In the present study, a mathematical model is proposed to describe the behavior of fluid flow, heat and mass transfer, as well as chemical reactions in a BF, in which gas, solid, and liquid phases affect each other through interaction forces, and their flows are competing for the space available. Process variables that characterize the internal furnace state, such as reduction degree, reducing gas and burden concentrations, as well as gas and condensed phase temperatures, have been described quantitatively. In particular, different treatments of the cohesive zone (CZ), i.e., layered, isotropic, and anisotropic nonlayered, are discussed, and their influence on simulation results is compared. The results show that predicted fluid flow and thermochemical phenomena within and around the CZ and in the lower part of the BF are different for different treatments. The layered CZ treatment corresponds to the layered charging of burden and naturally can predict the CZ as a gas distributor and liquid generator.

show abstract

Section: An Ironmaking Blast Furnace (Bf) Is a Multiphasementioning

confidence: 99%

Modeling of Blast Furnace with Layered Cohesive Zone

Dong

Chew³

et al. 2010

Metall Mater Trans B

119

View full text Add to dashboard Cite

show abstract

“…Dmitriev [1][2][3][4][5][6][7][8][9][10][11]. The works of certain international authors are also worth mentioning: Kule J., Sasaki M., Ono K., Suzuki A., Burgess J.M., Jenkins D.R., Hockings K.L., Kumar S.A., Suresh N., Jeffreson C.P., and Gobetto M. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Blast Furnace Operating Modes for Identification of the Areas of Unimprovable Solutions

Kazarinov

Shnayder

Barbasova

2017

KEM

View full text Add to dashboard Cite

This work reviews the issues of modeling of the operating modes for a blast furnace and identification of areas of unimprovable solutions on a set of indicators of cast iron output, coke consumption, and thermal state. These areas define the boundaries of potential opportunities for achieving high values of quality of the blast-furnace processes on a set of real-life operating modes of a blast furnace. They also indicate the reserves of coke consumption reduction and output enhancement, which might be implemented by optimal choice of a blast furnace operating mode and which enable the reasonable choice of the operating mode of a blast furnace based on the potential opportunities for increasing the output, minimizing coke consumption for the specified coke quality and the specified requirements to the furnace thermal state.

show abstract

“…Gas was assumed to be distributed so as to equalize the pressure drop along the cohesive layer and the coke layer in the cohesive zone. The gas resistance of the cohesive layer was calculated using Sugiyama's formula, 17) and that of the coke layer was calculated using Ergun's formula. 18) ........... (1) ...... (2) where DP is the differencial gas pressure, L is the distance, C is the discharge coefficient for orifice, m is the diameter ratio, F is the average shape factor of particles in the mixed layer, D p is the average diameter of particles, S r is the contraction of particles, r g is the density of gas, u is the superficial velocity, g is the gravitational acceleration, M is the mixed coke ratio and e is the void fraction of packed bed.…”

Section: Gas Permeability Of Cohesive Zonementioning

confidence: 99%