scholarly journals Drain Rate and Liquid Level Simulation in Blast Furnace Hearth Using Plant Data

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Hemant Upadhyay ◽  
T. K. Kundu
Keyword(s):  
Blast Furnace ◽  
Furnace Operation ◽  
Liquid Level ◽  
Furnace Hearth ◽  
Critical Limit ◽  
Proper Understanding ◽  
Drainage Rate ◽  
Close Time ◽  
Plant Data ◽  
And Control

Proper understanding and control of drainage of hot metal and slag from hearth are essential for a stable and efficient blast furnace operation. Various operational problems like irregular casting intervals, damage to lining, low blast intake, furnace pressurization, and so forth are normally encountered when liquid levels in the hearth exceed a critical limit where hearth coke and deadman start to float. Estimation of drain rate and liquid level in hearth needs to be simulated based on the operating parameters available as carrying out any direct measurement is extremely difficult due to the hostile conditions. Here, a mathematical model has been developed to simulate real-time liquid level and drainage behavior of the furnace hearth. Based on the computed drainage rate, production rate, and mass balance, the model is able to predict occurrence of slag-out time and cast close time which are in good agreement with the plant data.

scholarly journals Monitoring Liquid Level of Blast Furnace Hearth and Torpedo Ladle by Electromotive Force Signal

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 665 ◽  
Author(s):  
Ying Li ◽  
Lei Zan ◽  
Yao Ge ◽  
Han Wei ◽  
Zhenghao Zhang ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Electromotive Force ◽  
Thermal State ◽  
Single Layer ◽  
Graphite Crucible ◽  
The State ◽  
Liquid Level ◽  
Double Layers ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

The state of a blast furnace hearth, especially the liquid level of hot metal and slag during the tapping process, is of crucial importance with respect to a long campaign blast furnace. In practice, the state of the hearth is evaluated mainly by the experience of operators. In this paper, the electromotive force (EMF) is used to monitor the liquid level of a laboratory scale of blast furnace hearth and the effect of liquid level, EMF sensors position and the thickness of refractory on EMF signals are tested using a single layer of water and double layers of water and oil. After laboratory experiments, the electromotive force (EMF) is used to monitor the liquid level of torpedo ladle successfully. Laboratory experimental results show that the change in liquid level can be characterized by EMF signal. The state of liquid surface and local thermal state cause the EMF signal to vary in the circumferential direction of the vessel. Furthermore, the EMF signal magnitude decreases with the decrease of the thickness of the graphite crucible. Finally, the main conclusions of the laboratory experiment are supported by the torpedo ladle experiment.

scholarly journals Experimental Model Study of Liquid–Liquid and Liquid–Gas Interfaces during Blast Furnace Hearth Drainage

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 496 ◽  
Author(s):  
Weiqiang Liu ◽  
Lei Shao ◽  
Henrik Saxén
Keyword(s):  
Blast Furnace ◽  
Furnace Operation ◽  
Slag Viscosity ◽  
Two Dimensional ◽  
Furnace Hearth ◽  
Breakthrough Time ◽  
Initial Amount ◽  
Blast Pressure ◽  
Blast Furnace Hearth ◽  
Model Study

The smooth drainage of produced iron and slag is a prerequisite for stable and efficient blast furnace operation. For this it is essential to understand the drainage behavior and the evolution of the liquid levels in the hearth. A two-dimensional Hele–Shaw model was used to study the liquid–liquid and liquid–gas interfaces experimentally and to clarify the effect of the initial amount of iron and slag, slag viscosity, and blast pressure on the drainage behavior. In accordance with the findings of other investigators, the gas breakthrough time increased and residual ratios for both liquids decreased with an increase of the initial levels of iron and slag, a decrease in blast pressure, and an increase in slag viscosity. The conditions under which the slag–iron interface in the end state was at the taphole and not below it were finally studied and reported.

Multistep Forecasting Models of the Liquid Level in a Blast Furnace Hearth

2017 ◽  
Vol 14 (2) ◽  
pp. 1286-1296 ◽  
Author(s):  
Flavio S. V. Gomes ◽  
Klaus F. Coco ◽  
Jose Leandro Felix Salles
Keyword(s):  
Blast Furnace ◽  
Liquid Level ◽  
Furnace Hearth ◽  
Forecasting Models ◽  
Blast Furnace Hearth

Evaluation of Refractory Lining of the Blast Furnace Hearth and Bottom in Five Years of its Operation on the Basis of the Isotherms Shapes

2013 ◽  
Vol 212 ◽  
pp. 179-182
Author(s):  
Grzegorz Kopeć ◽  
Bolesław Machulec
Keyword(s):  
Blast Furnace ◽  
Refractory Lining ◽  
Early Stage ◽  
Measurement Data ◽  
Furnace Operation ◽  
Furnace Hearth ◽  
Furnace Campaign ◽  
Liquid Products ◽  
One Year ◽  
Partial Damage

Based on archival temperature measurement data regarding a blast furnace (capacity of 3200 m3) hearth and bottom refractory lining, empirical isotherms T = 300°C, for various periods of the first five years of the furnace campaign were determined. This resulted in an attempt to assess the hearth and bottom refractory lining in the third month and subsequently, in the next years of the blast furnace operation. The empirical isotherms, determined after the first three months, were compared to the isotherms determined using the method of mathematical modelling. These empirical isotherms were compared to each other, respectively in one-year intervals. The most distinctive changes of the hearth and bottom refractory lining were observed during the first three months of the furnace campaign. In the further period of five years, the changes were insignificant. During the early stage of furnace operation, observed deterioration of the refractory lining was associated with partial damage of the bottom ceramic layer and elephants foot-shaped defects of the refractory lining in the lower, thickened parts of the hearth walls. Early, elephants foot-shaped wear of the refractory lining is related to the mechanism of its wash-out by liquid products of the process during tapping, which results from certain maladjustment of the hearth and bottom inner geometry in modern furnaces to the hydrodynamic conditions of metal and slag flow.

Real-time blast furnace hearth liquid level monitoring system

2016 ◽  
Vol 43 (7) ◽  
pp. 550-558 ◽  
Author(s):  
Ashish Agrawal ◽  
Swapnil C. Kor ◽  
Utpal Nandy ◽  
Abhik R. Choudhary ◽  
Vineet R. Tripathi
Keyword(s):  
Blast Furnace ◽  
Real Time ◽  
Monitoring System ◽  
Liquid Level ◽  
Furnace Hearth ◽  
Blast Furnace Hearth ◽  
Level Monitoring

Effect of titanium on the skull formation of the blast furnace hearth

2020 ◽  
Vol 117 (4) ◽  
pp. 409
Author(s):  
Yan Li ◽  
Tingfang Jian ◽  
Tongxiang Ma ◽  
Meilong Hu ◽  
Leizhang Gao ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Control Mechanism ◽  
Protective Layer ◽  
Molten Iron ◽  
Monitoring And Control ◽  
Furnace Hearth ◽  
Factors Affecting ◽  
Blast Furnace Hearth ◽  
On Line ◽  
And Control

The erosion of the blast furnace hearth has become one of the key factors affecting the life of the blast furnace, because of the limited on-line monitoring and control means in the blast furnace hearth area, the burn-through accidents of the blast furnace hearth and bottom occur occasionally. In this work, based on the self-built platform of heat flow regulation, the control mechanism of the high melting phases of TiC is studied. The on-line control mechanism of the hearth erosion by adding titanium-containing materials was discussed. There are three steps for the on-line control of iromaking using titanium-containing materials in blast furnace. Firstly, Ti(C, N) precipitated from the molten iron due to the decrease of temperature in the erosion zone of the hearth. Secondly, the viscosity of the molten iron increased with the precipitation of Ti(C, N) in the erosional cryogenic zone and temperature further decreasing. Finally, the protective layer, included pig iron matrix and Ti(C, N) solid fulcrum, formed because of the solidification of the molten iron. The protective layer can replace the corroded lining of the blast furnace to prevent its hearth from being eroded.

A review on liquid level measurement techniques using mathematical models and field sensors in blast furnace

2019 ◽  
Vol 116 (3) ◽  
pp. 307 ◽  
Author(s):  
Ashish Agrawal ◽  
Anil Kumar Kothari ◽  
R.V. Ramna ◽  
Padmapal ◽  
Manish Kumar Singh
Keyword(s):  
Blast Furnace ◽  
Measurement Techniques ◽  
Furnace Operation ◽  
Integrated System ◽  
Liquid Level ◽  
Estimation Methods ◽  
Advantages And Disadvantages ◽  
Model Based ◽  
Level Measurement ◽  
Liquid Level Measurement

Stable blast furnace operation requires proper drainage of liquid from the hearth. The estimation of drainage rate and hearth liquid level are of utmost importance for understanding the underlying hearth phenomena. The present review gives an insight of the need for measurement of the hearth liquid level and further throws light on various methods of estimation of hearth liquid level in-depth, which is primarily divided into 2 categories namely; model-based estimation and sensor-based estimation. Although the model-based estimation and sensor-based estimation have their own advantages and disadvantages, an integrated system comprising of both methods could potentially facilitate operators to reveal the state of hearth, which is unless not available with the implementation of a single method of estimation. Furthermore, the challenges in the estimation and the prospects for determining the reliable hearth liquid level measurement in blast furnace are discussed. The article is presented to give prospect of encountering the drift occurring in estimation of liquid level, which leads to inaccurate prediction and simulation with the industrial blast furnace. Lastly, the article gives recommendation for improving the liquid level estimation methods in blast furnace.

Drainage rate and hearth liquid level estimation in absence of direct measurements in blast furnace

2018 ◽  
Vol 47 (3) ◽  
pp. 328-336 ◽  
Author(s):  
Ashish Agrawal ◽  
Manmohan Tiwari ◽  
Mahesh Kumar Agarwal ◽  
Anil Kumar Kothari
Keyword(s):  
Blast Furnace ◽  
Liquid Level ◽  
Drainage Rate ◽  
Direct Measurements

Improvement in casting practice by controlling the drainage rate and hearth liquid level to develop an efficient casthouse management practice in blast furnace

2017 ◽  
Vol 46 (4) ◽  
pp. 373-382 ◽  
Author(s):  
Ashish Agrawal ◽  
Raj Kumar Vishwakarma ◽  
Vineet R. Tripathi ◽  
Anil K. Kothari ◽  
Bindeshwar Prasad ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Management Practice ◽  
Liquid Level ◽  
Drainage Rate
Sign in / Sign up

Export Citation Format

Share Document