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Open Hearth Furnace || Fitter || Blub Studio
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How does an open hearth furnace work?
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The open-hearth furnace (OHF) uses the heat of combustion of gaseous or liquid fuels to convert a charge of scrap and liquid blast-furnace iron to liquid steel. The high flame temperature required for melting is obtained by preheating the combustion air and, sometimes, the fuel gas.
Are open-hearth furnaces still used?
Though the open-hearth process has been almost completely replaced in most industrialized countries by the basic oxygen process and the electric arc furnace, it nevertheless accounts for about one-sixth of all steel produced worldwide.
How do you do the open hearth process?
Open-hearth process
The furnace is heated using burning gas. Once the charge has melted, heavy scrap, such as building, construction or steel milling scrap is added, together with pig iron from blast furnaces. Once all the steel has melted, slag-forming agents such as limestone are added.
At what temperature open hearth furnace operates?
The open-hearth furnace was fired with air and fuel gas that were preheated by combustion gases to 800° C (1,450°…
Which gas is used in open hearth furnace?
Open hearth furnaces are first charged with scrap and a small amount of limestone. Limestone is used as a reduction agent. Then the fuel-typically oil, natural gas, coal, tar and pitch, or a combination of these-is ignited to melt the charge (Fig.
At what temperature open hearth furnace operates?
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The open-hearth furnace was fired with air and fuel gas that were preheated by combustion gases to 800° C (1,450°…
How does an open hearth furnace work?
The open-hearth furnace (OHF) uses the heat of combustion of gaseous or liquid fuels to convert a charge of scrap and liquid blast-furnace iron to liquid steel. The high flame temperature required for melting is obtained by preheating the combustion air and, sometimes, the fuel gas.
Are open-hearth furnaces still used?
Though the open-hearth process has been almost completely replaced in most industrialized countries by the basic oxygen process and the electric arc furnace, it nevertheless accounts for about one-sixth of all steel produced worldwide.
Which fuel is used in open hearth furnace?
Open hearth furnaces are first charged with scrap and a small amount of limestone. Limestone is used as a reduction agent. Then the fuel-typically oil, natural gas, coal, tar and pitch, or a combination of these-is ignited to melt the charge (Fig. 6).
What is the minimum capacity of an open hearth furnace in steel foundries?
Explanation: Open hearth process was primarily used only for steel making, it was later brought to use in steel foundries. The minimum capacity of open hearth furnace in steel foundries is 5 tons.
What is the difference between the open hearth furnace and the Bessemer furnace?
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The average ni- trogen content of the steels produced is about half that in ordinary commercial open hearth material. The Bessemer process cost for fluxes and fettling is almost four times that of the open hearth, but the open hearth is substantially higher in fuel, mainte- nance, and mixer costs.
In what way does Bessemer process differ from open hearth process?
Compared with the Bessemer process, which it displaced, its main advantages were that it did not expose the steel to excessive nitrogen (which would cause the steel to become brittle), was easier to control, and permitted the melting and refining of large amounts of scrap iron and steel.
What is Bessemer and open hearth process?
The Bessemer process was the first inexpensive industrial process for the mass production of steel from molten pig iron before the development of the open hearth furnace. The key principle is removal of impurities from the iron by oxidation with air being blown through the molten iron.
Why is open hearth process more advantageous than Bessemer process?
Open hearth process is a slow process and easy to control. We can minimize the slag due to the low speed and high efficiency of the process. The process is controlled and all the carbon need not be burned, unlike Bessemer process, hence being able to stop the process when required carbon contents are achieved.
What does an open hearth furnace do?
The open-hearth furnace (OHF) uses the heat of combustion of gaseous or liquid fuels to convert a charge of scrap and liquid blast-furnace iron to liquid steel. The high flame temperature required for melting is obtained by preheating the combustion air and, sometimes, the fuel gas.
Are open hearth furnaces still used?
- Asked: Today
- Answered: 6 minute ago
- Views: 5495 times
- Helpful Reviewers: 5586
- Likes: 6068
- Dislikes: 9
Though the open-hearth process has been almost completely replaced in most industrialized countries by the basic oxygen process and the electric arc furnace, it nevertheless accounts for about one-sixth of all steel produced worldwide.
What replaced the open-hearth process?
Though the open-hearth process has been almost completely replaced in most industrialized countries by the basic oxygen process and the electric arc furnace, it nevertheless accounts for about one-sixth of all steel produced worldwide.
Which of the following is a disadvantage of the open hearth furnace?
The basic open hearth furnace, the worlds greatest steel producer at present, suffers under the disadvantage of greater cost of operation than the Bessemer converter, due chiefly to costs for fuel, labor and repairs.
What is the use of open hearth furnace?
The open-hearth furnace (OHF) uses the heat of combustion of gaseous or liquid fuels to convert a charge of scrap and liquid blast-furnace iron to liquid steel.
In what year that open hearth furnace was developed?
In 1865, the French engineer Pierre-Émile Martin took out a license from Siemens and first applied his regenerative furnace for making steel. Their process was known as the Siemens-Martin process or Martin-Siemens process, and the furnace as an open-hearth furnace.
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