The Experts below are selected from a list of 48 Experts worldwide ranked by ideXlab platform
Cheng Shu-sen - One of the best experts on this subject based on the ideXlab platform.
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Influence Factors of Gas Distribution in Blast Furnace Hearth
Ironmaking & Steelmaking, 2012Co-Authors: Cheng Shu-senAbstract:Blast furnace enlargement is the trend of ironmaking development.As the Diameter of blast furnace Hearth increasing,the inactive region in the centre of blast furnace Hearth becomes larger.It is a focus of attention how to guide the gas into the centre for BF operators.Three-dimensional model of blast furnace Hearth was established.The gas velocity was calculated by CFX numerical simulation software.The influence of Hearth Diameter,coke Diameter,stock column voidage and kinetic energy of tuyeres on the gas flow distribution in blast furnace Hearth was investigated using this model.The results show that when the coke Diameter and voidage distribute uniformly,the gas velocity in the periphery is still higher than the center.As the Diameter of blast furnace Hearth increasing,the center will become much inactive.The coke Diameter and stock column voidage play an important part on improving the permeability of blast furnace Hearth.The kinetic energy of tuyeres is related with the coke Diameter and stock column in blast furnace Hearth.In order to guarantee the stability of blast furnace,the blast parameters must be set reasonable.Blowing through the centre of blast furnace Hearth can not be achieved by increasing the kinetic energy of tuyeres.
M. Geerdes - One of the best experts on this subject based on the ideXlab platform.
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Recent improvements in blast furnace operation at the Ahmsa Monclova Works
Iron-steel Engineer, 1993Co-Authors: J.m. Morales-yanez, H. Dominguez-lara, M. Geerdes, Monclova Hoogovens Technical ServicesAbstract:Following the privatization of Altos Hornos de Mexico in Nov. 1991, four areas were selected to improve blast furnace performance and hot metal costs. These areas included: improvements of pellet quality; start of oil-gas coinjection; improved control of gas flow in the blast furnace; and start of monitoring program to predict the remaining life of the Hearth of the major blast furnace. The efforts resulted in the following improvements in the first half of 1992: (1) Production level increased to 2.4 tonnes/cu meter/24 hr. Annual production record of blast furnace No. 5 (Hearth Diameter 11.2 meter), set in 1992, was 1,639 million tonnes. (2) Coke rates decreased by 60 kg/tonne, half of which was due to process improvements and the other half to injection of oil. (3) Silicon standard deviations decreased from 0.22% in 1991 to 0.20% in 1992. (4) Hot metal costs decreased by 10.6%. (5) The major reline of blast furnace No. 5 can be postponed by at least 1.5 years.
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Recent improvements in blast furnace operation within the AHMSA/GAN, Monclova Mexico works
1993Co-Authors: J.m. Morales, H. Dominguez, M. GeerdesAbstract:Following the privatization of Altos Hornos de Mexico in November 1991 four areas were chosen to improve blast furnace performance and hot metal costs. These areas included improvement of pellet quality, start of oil-gas co-injection in the blast furnace, improved control of gas flow in the blast furnace and start of monitoring program to predict the remaining life of the Hearth of the major blast furnace at AHMSA. The efforts resulted in the following improvements in the first half of 1992: production level increased to 2.4 ton/m[sup 3]/24 hrs; moreover, the annual production record of blast furnace 5 (Hearth Diameter 11.2 m, 37 ft) set in 1992, was 1.639 mln tonnes; coke rates decreased by 60 kg/tonne, half of which was due to process improvements and the other half to injection of oil; silicon standard deviations decreased from 0.22% in 1991 to 0.20% in 1992; hot metal costs decreased with 10.6%; and the major reline of BF 5 can be postponed by at least 1.5 year.
Henrik Saxén - One of the best experts on this subject based on the ideXlab platform.
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Model of Draining of the Blast Furnace Hearth with an Impermeable Zone
Metallurgical and Materials Transactions B, 2015Co-Authors: Henrik SaxénAbstract:Due to demands of lower costs and higher productivity in the steel industry, the volume of operating blast furnaces has grown during the last decades. As the height is limited by the allowable pressure drop, the Hearth Diameter has grown considerably and, along with this, also draining-related problems. In this paper a mathematical model is developed for simulating the drainage in the case where an impermeable region exists in the blast furnace Hearth. The model describes the quasi-stationary drainage process of a Hearth with two operating tapholes, where the communication between the two pools of molten slag and iron can be controlled by parameterized expressions. The model also considers the case where the buoyancy of the liquids is sufficient for lifting the coke bed. The implications of different size of the liquid pools, communication between the pools, bed porosity, etc . are studied by simulation, and conclusions concerning their effect on the drainage behavior and evolution of the liquid levels in the Hearth are drawn. The simulated liquid levels are finally demonstrated to give rise to a pressure profile acting on the Hearth which agrees qualitatively with signals from strain gauges mounted in the Hearth wall of an industrial ironmaking process.
Monclova Hoogovens Technical Services - One of the best experts on this subject based on the ideXlab platform.
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Recent improvements in blast furnace operation at the Ahmsa Monclova Works
Iron-steel Engineer, 1993Co-Authors: J.m. Morales-yanez, H. Dominguez-lara, M. Geerdes, Monclova Hoogovens Technical ServicesAbstract:Following the privatization of Altos Hornos de Mexico in Nov. 1991, four areas were selected to improve blast furnace performance and hot metal costs. These areas included: improvements of pellet quality; start of oil-gas coinjection; improved control of gas flow in the blast furnace; and start of monitoring program to predict the remaining life of the Hearth of the major blast furnace. The efforts resulted in the following improvements in the first half of 1992: (1) Production level increased to 2.4 tonnes/cu meter/24 hr. Annual production record of blast furnace No. 5 (Hearth Diameter 11.2 meter), set in 1992, was 1,639 million tonnes. (2) Coke rates decreased by 60 kg/tonne, half of which was due to process improvements and the other half to injection of oil. (3) Silicon standard deviations decreased from 0.22% in 1991 to 0.20% in 1992. (4) Hot metal costs decreased by 10.6%. (5) The major reline of blast furnace No. 5 can be postponed by at least 1.5 years.
A. Poos - One of the best experts on this subject based on the ideXlab platform.
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Recent advances in blast furnace ironmaking in Western Europe.
ISIJ International, 1991Co-Authors: A. PoosAbstract:Prior to 1974, the evolution of the ironmaking sector in Western Europe was strongly marked, on one hand by the rapid growth of steel industry, and on the other hand by the replacement of lean local ores by iron-rich imports from overseas. The former evolution was abruptly stopped by the energy crisis and was followed by a period of contracting production and streamlining of the existing installations.The few new blast furnaces built replaced a larger number of small obsolete units, and the production was concentrated on the most performing furnaces. New ecological constraints put further pressure on the ironmaking sector. The necessity to reduce or completely suppress tuyere injection of oil also had an adverse effect on furnace productivity and on the smoothness of the operation.Today, all these difficulties have been overcome and the West European blast furnaces achieve excellent performances. The typical plant has two blast furnaces in the range of 8-11 m of Hearth Diameter, with modern equipment for controlling and monitoring the burden distribution at the top and computerized control rooms. The mean productivity is about 50 t/m2·24 h and the average total fuel rate lies below 500 kg/tHM. Coal injection has been a rapid expansion over the past five years, and end of 1991 the total installed coal injection capacity will exceed 10 Mio t of coal/annum. High injection rates above 170 kg/tHM have been reached on several blast furnaces, reducing the coke rate below 330 kg/tHM and, in at least one case, even below 300 kg/tHM. Trials presently in progress aim at coal injection rates above 300 kg/tHM.
