By Yuri N. Toulouevski, Ilyaz Y. Zinurov
The ebook includes an research of theoretical dependences, bottlenecks and restricting components of a brand new expertise utilized in either Consteel and shaft furnaces working with flat bathtub. Performances acquired and prospects of those furnaces are tested. in response to this research, a metal melting combination of the recent style – gasoline arc furnace FAF has been built and provided. compared to the easiest smooth electrical arc furnaces of exact means the productiveness of FAF is better by way of 36% and electricity intake is reduce by means of an element of 1.8. atmosphere features are significantly improved.
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Extra info for Electric Arc Furnace with Flat Bath: Achievements and Prospects
As the arc power rises, both melting rate and hourly productivity of the furnaces increase. In the modern EAFs, the scrap melting process may be divided into two periods. During the first period, the main body of scrap pile is melted down with the electric arcs in the furnace freeboard above the hot heel surface. Plasma of the arcs has a temperature of more than 5000 °C and possesses high kinetic energy. The heat energy of the arcs is transferred to the scrap by both radiation and convection. The intensity of these heat transfer processes is much higher than that in the liquid metal where the difference between a temperature of the liquid metal and scrap melting point amounts to 30–40 °C only.
An attempt to increase the power of such burners has been failed and they did not become spread. Thus, in EAFs with conventional scrap charging from the top a possibility of reduction in electrical energy consumption due to the use of burners installed at the furnace freeboard is considerably limited and mainly exhausted. The continuous scrap charging allows carrying out the process of heating a scrap with the burners outside the furnace freeboard at separate devices which are much more fitted for this process.
Such a system allows covering the shaft with a hood and considerable decreasing uncontrolled gas-dust emissions from the shaft during the charging of scrap. 6, in the EAF Quantum the fingers, similar to pitchforks, are introduced into the shaft through its sidewalls. To charge a batch of the preheated scrap into the bath the fingers are pulled out of the sidewalls of the shaft. After charging they are immediately introduced into the shaft to receipt the next batch of scrap. Thus, all the scrap is heated on the fingers what allows increasing its average mass temperature.