A Review on Swirling Flow Casting Technology in Steel Production

Author(s):  
Qinghua Xie ◽  
Muhammad Nabeel ◽  
Mikael Ersson ◽  
Peiyuan Ni
Author(s):  
D. Chatterjee

Purpose: Ladle to tundish melt transfer is paramount importance over the last three decades to controlling the cleanliness of high value steel. Tundish is an important buffer between ladle and mould where inclusion separation, flotation can be enhanced and exposed slag eye formation can be hindered by applying the knowledge of fluid dynamics as well heat transfer by changing the design of conventional flow modifiers towards production of ultra clean steel. Design/methodology/approach: In current numerical investigation a new conceptual flow control device called ‘vacuum shroud (VS)’ has been proposed to reduce slag eye formation, emulsifications and unwanted inclusions generations. Due to upward suction force from the side of the pouring nozzle the device is quite capable to reduce turbulence and emulsification within the tundish melt. Findings: Approximately 76% improvement in the overall process and 40% enhancement to inclusion floatability are predictable by using current flow control device (FCD). Research limitations/implications: Slag eye formation during pouring of liquid steel to tundish is a barrier to clean steel production on sustained manner. Several efforts have been made over the decades to resolve this phenomenon by suppressing the turbulence within this reactor incorporating many innovative flow control refractory’s like turbo-stop, trumpet shroud, advance pouring box, dissipative shroud, velocity break shroud, swirling flow shroud etc. But ultimate success is not possible to reach. Originality/value: The present investigation is development of an innovative flow control device (FCD) to control the aforementioned problems within this metallurgical reactor.


2003 ◽  
Vol 112 ◽  
pp. 717-719
Author(s):  
V. N. Slipchenko ◽  
Yu. N. Koval ◽  
O. V. Koshovy

Author(s):  
V. A. Spirin ◽  
V. E. Nikol’skii ◽  
D. V. Vokhmintsev ◽  
A. A. Moiseev ◽  
P. G. Smirnov ◽  
...  

At steel production based on scrap metal utilization, the scrap heating before charging into a melting facility is an important way of energy efficiency increase and ecological parameters improving. In winter time scrap metal charging with ice inclusions into a metal melt can result in a considerable damage of equipment and even accidents. Therefore, scrap preliminary drying is necessary to provide industrial safety. It was shown, that in countries with warm and low-snow climate with no risk of scrap metal icing up during its transportation and storing in the open air, the basic task being solved at the scrap drying is an increase of energy efficiency of steelmaking. InRussiathe scrap metal drying first of all provides the safety of the process and next - energy saving. Existing technologies of scrap metal drying and heating considered, as well as advantages and drawbacks of technical solutions used at Russian steel plants. In winter time during scrap metal heating at conveyers (Consteel process) hot gases penetrate not effectively into its mass, the heat is not enough for evaporation of wetness in the metal charge. At scrap heating by the furnace gases, a problem of dioxines emissions elimination arises. Application of shaft heaters results in high efficiency of scrap heating. However, under conditions of Russian winter the upper scrap layers are not always heated higher 0 °С and after getting into a furnace bath the upper scrap layers cause periodical vapor explosions. The shaft heaters create optimal conditions for dioxines formation, which emit into atmosphere. It was shown, that accounting Russian economic and nature conditions, the metal charge drying and heating in modified charging buckets by the heat of burnt natural gas or other additional fuel is optimal. The proposed technical solution enables to burnt off organic impurities ecologically safely, to melt down ice, to evaporate the wetness in the scrap as well as to heat the charge as enough as the charging logistics enables it. The method was implemented at several Russian steel plants. Technical and economical indices of scrap metal drying in buckets under conditions of EAF-based shop, containing two furnaces ДСП-100, presented.


Author(s):  
Nguyen Thi Kim Huyen

Applying the Material Flows Cost Accounting method in Thai Nguyen steel enterprises is one of the solutions to improve the efficiency in the production process, using input materials, and environmental performance, as well as to measure more correctly the production costs based on the change of the price calculation basic. Identifying the factors which affect the decision on applying MFCA to the accounting process of Thai Nguyen steel production enterprises by a direct survey is carried out with 119 accountants and managers working at 13 steel enterprises. The results show that applying MFCA to the accounting process in these enterprises depends on the strategies, capacities, the accounting system of those enterprises, and the system of legal documents related to environmental accounting.


1987 ◽  
Author(s):  
M. SAMIMY ◽  
A. NEJAD ◽  
R. CRAIG ◽  
S. VANKA
Keyword(s):  

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