Research on the Reasonable Air Velocity of Blast Furnace Tuyere

2013 ◽  
Vol 680 ◽  
pp. 351-355 ◽  
Author(s):  
Xi Ping Guo ◽  
Wen Yue Han
Keyword(s):  
Blast Furnace ◽  
Gas Flow ◽  
Three Dimensional ◽  
Cooling Water ◽  
Air Velocity ◽  
Hot Gas ◽  
Hot Air ◽  
Blast Furnace Tuyere ◽  
Flow Rate Range ◽  
Velocity Interval

Researching on the influence of blast furnace tuyere under the condition of hot gas flow rate range of 60 ~240m / s by the method of using computational fluid dynamics. During the process of going through the tuyere, the tuyere cool the hot gas due to the cooling water inner it . At the same time, the more slow hot gas flow velocity is, the stronger cooling effect is, the greater energy is lost. Take this to hot air flow field of three dimensional numerical simulation, and discussed the reasonable air velocity interval, which can guarantee low thermal load and prevent a loss to larger energy .

Numerical Analysis of Flow Behavior Inside the Blast Furnace

2009 ◽  
Author(s):  
Dong Fu ◽  
Fengguo Tian ◽  
Guoheng Chen ◽  
D. Frank Huang ◽  
Chenn Q. Zhou
Keyword(s):  
Blast Furnace ◽  
Gas Flow ◽  
Cfd Simulation ◽  
Flow Behavior ◽  
Three Dimensional ◽  
Furnace Productivity ◽  
Gas Distribution ◽  
Furnace Shaft ◽  
Parametric Studies ◽  
Flow Through

Gas and burden distributions inside a blast furnace play an important role in optimizing gas utilization versus the furnace productivity and minimizing the CO2 emission in steel industries. In this paper, a mathematical model is presented to describe the burden descent in the blast furnace shaft and gas distribution, with the alternative structure of coke and ore layers being considered. Multi-dimensional Ergun’s equation is solved with considering the turbulent compressible gas flow through the burden column. The porosity of each material will be treated as a function of three dimensional functions which will be determined by the kinetics sub-models accordingly. A detailed investigation of gas flow through the blast furnace will be conducted with the given initial burden profiles along with the effects of redistribution during burden descending. Also, parametric studies will be carried out to analyze the gas distribution cross the blast furnace under different cohesive zone (CZ) shapes, charging rate, and furnace top pressure. A good agreement was obtained between the CFD simulation and published experimental data. Based on the results, the inverse V shape is proved to be the most desirable CZ profile.

scholarly journals Mathematical Model Analysis on Three-dimensional Gas Flow in Blast Furnace

1987 ◽  
Vol 73 (15) ◽  
pp. 2036-2043 ◽  
Author(s):  
Yotaro OHNO ◽  
Yutaka YAMADA ◽  
Kunihiro KONDO ◽  
Takashi TAKEBE
Keyword(s):  
Mathematical Model ◽  
Blast Furnace ◽  
Gas Flow ◽  
Three Dimensional ◽  
Model Analysis ◽  
Mathematical Model Analysis

scholarly journals Simulation of Natural Ventilation Inside Tunnel Greenhouse

2020 ◽  
Vol 38 (3) ◽  
pp. 752-757
Author(s):  
Cherine Lebbal ◽  
Saadi Bougoul ◽  
Samra Zeroual
Keyword(s):  
Turbulent Flows ◽  
Natural Ventilation ◽  
Three Dimensional ◽  
Vertical Gradient ◽  
Air Velocity ◽  
Hot Air ◽  
Heated Floor ◽  
Volume Method ◽  
Air Circulation ◽  
Three Dimensional Simulations

A study of the variation of the temperature and the speed under an open greenhouse with and without plant was developed and the effect of the wind speed on the internal climate under the greenhouse was analyzed by the use of the software Fluent-CFD based on the finite volume method. The airflow through the crop was introduced by using the porous medium approach. Three dimensional simulations which described turbulent flows in steady state were carried out and the turbulence was modeled by using the standard k-ε model. The air temperature variation shows a gradient from the sidewalls towards the center of the greenhouse due to the movement of the hot air rising towards the roof and another vertical gradient due to the air circulation above the surface of the heated floor. At the openings, the maximum air velocity was reached and the lowest values are observed in the middle of the greenhouse, at the crop level and at the corners. The variation of the climatic parameters affects greatly the growth of the plant. The results of the simulation given as airflows and temperature patterns are satisfactory while comparing them to those of the literature. These results can help to know the distribution of the internal climate inside the greenhouse, so they facilitate the openings design.

Heat Transfer Analysis in a Blast Furnace Tuyere Nose

2005 ◽  
Author(s):  
David Roldan ◽  
Clifford Tetrault ◽  
Yongfu Zhao ◽  
Mark Atkinson ◽  
Chenn Q. Zhou
Keyword(s):  
Heat Transfer ◽  
Blast Furnace ◽  
Radiation Heat Transfer ◽  
Cooling Water ◽  
Chemical Reactor ◽  
Operating Conditions ◽  
Heat Transfer Analysis ◽  
Large Area ◽  
Fuel Gas ◽  
Hot Air

The Blast furnace process is a counter current moving bed chemical reactor to reduce iron oxides to iron for iron/steel making. In the process, tuyeres are used to introduce hot air (blast) and fuel (gas or pulverized coal) into the furnace for combustion. The nose of a tuyere, composed of copper material, that is exposed to a high temperature environment and a cooling water pipe is embedded to prevent melting of the material. In this work, heat transfer and temperature distributions have been analyzed using the computational fluid dynamics commercial software, FLUENT®. The computations have included the cooling water flow and conjugate heat transfer in the tuyere nose. Both convection and radiation heat transfer on the surfaces are included. Different geometry and operating conditions were considered. The results have indicated that insufficient cooling in a large area between the nose inlet and outlet pipe can cause failures of the tuyere nose.

Internal Wall-Jet Film Cooling With Tangential Coolant Holes

2012 ◽  
Author(s):  
S. R. Shine ◽  
S. Sunil Kumar ◽  
B. N. Suresh
Keyword(s):  
Film Cooling ◽  
Gas Flow ◽  
Three Dimensional ◽  
Data Simulation ◽  
Annular Slot ◽  
Blowing Ratio ◽  
Hot Air ◽  
New Ideas ◽  
Cylindrical Holes ◽  
Turbine Casing

Experimental and numerical investigations are carried out to analyze the effect of tangential coolant injection on overall film cooling performance in a cylindrical test section simulating a high curvature surface. Experiments are conducted using hot air as core gas and nitrogen gas as coolant injected through cylindrical holes inclined at 30-degrees to the core gas flow. A three-dimensional multi-species numerical model is formulated using the finite volume formulation and is validated using the obtained experimental data. Simulation results indicate that an optimum blowing ratio exists for which the effectiveness is maximum. The conjugate effectiveness is observed to be higher than adiabatic effectiveness values except in the vicinity of injection owing to the wall conduction effects. Numerical analysis performed with an annular slot placed at the exit of the coolant holes showed an increase in the effectiveness by 21 % compared to the base hole. It is expected that the knowledge acquired in this study has the potential to support new ideas in gas turbine film cooling techniques such as turbine casing film cooling.

scholarly journals Three-dimensional simulation of the pulverized coal combustion inside blast furnace tuyere

2010 ◽  
Vol 34 (11) ◽  
pp. 3536-3546 ◽  
Author(s):  
Mingyan Gu ◽  
Guang Chen ◽  
Mingchuan Zhang ◽  
D. (Frank) Huang ◽  
Pinakin Chaubal ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Coal Combustion ◽  
Three Dimensional ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Blast Furnace Tuyere ◽  
Dimensional Simulation

Measurement of erosion state and refractory lining thickness of blast furnace hearth by using three-dimensional laser scanning method

2020 ◽  
Vol 118 (1) ◽  
pp. 106
Author(s):  
Lei Zhang ◽  
Jianliang Zhang ◽  
Kexin Jiao ◽  
Guoli Jia ◽  
Jian Gong ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Laser Scanning ◽  
Refractory Lining ◽  
Three Dimensional ◽  
3D Laser Scanning ◽  
Scanning Method ◽  
Blast Furnace Production ◽  
Severe Erosion ◽  
Residual Thickness ◽  
Minimum Depth

The three-dimensional (3D) model of erosion state of blast furnace (BF) hearth was obtained by using 3D laser scanning method. The thickness of refractory lining can be measured anywhere and the erosion curves were extracted both in the circumferential and height directions to analyze the erosion characteristics. The results show that the most eroded positions located below 20# tuyere with an elevation of 7700 mm and below 24#–25# tuyere with an elevation of 8100 mm, the residual thickness here is only 295 mm. In the circumferential directions, the serious eroded areas located between every two tapholes while the taphole areas were protected well by the bonding material. In the height directions, the severe erosion areas located between the elevation of 7600 mm to 8200 mm. According to the calculation, the minimum depth to ensure the deadman floats in the hearth is 2581 mm, corresponding to the elevation of 7619 mm. It can be considered that during the blast furnace production process, the deadman has been sinking to the bottom of BF hearth and the erosion areas gradually formed at the root of deadman.

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