What is the purpose of Tuyeres?
Tuyeres — an old French term for “nozzles” —are used in many metallurgical vessels, including blast furnaces, which smelt iron, and cupolas, which melt iron, to direct the air blast into the furnace. Because they are in such a hot and chaotic environment inside the furnace, they are prone to premature failure.
What is meant by tuyere?
: a nozzle through which an air blast is delivered to a forge or blast furnace.
Which one of the following is the function of tuyeres in the forge?
Explanation: Tuyeres in forge acts as an outlet of products of combustion.
Does tuyere changing operation affect the production of blast furnace?
The tuyere small sleeve in blast furnace works under poor conditions. The abnormal damage of it will severely affect the performance of the blast furnace, thus it should be replaced during the damping down period.
What is the charge of blast furnace?
The furnace charge, or burden, of iron-bearing materials (e.g., iron-ore pellets and sinter), coke, and flux (e.g., limestone) descends through the shaft, where it is preheated and reacts with ascending reducing gases to produce liquid iron and slag that accumulate in the hearth.
How many Tuyeres are in a blast furnace?
Modern blast furnaces may have up to 42 tuyeres, through which the hot blast is injected in the furnace. They are usually made from copper and cooled with a water jacket to withstand the extreme temperatures.
What are the walls of the blast furnace made from?
Modern lead blast furnaces are constructed using water-cooled steel or copper jackets for the walls, and have no refractory linings in the side walls. The base of the furnace is a hearth of refractory material (bricks or castable refractory).
Why is natural gas is often injected through the bottom tuyeres in a bottom blown oxygen steel making process?
The bottom blowing enhances the stirring of the hot metal and thereby shortens the average mixing time in the molten steel bath, and promotes transport of solute carbon in the bath, preventing the over-oxidation of slag, which is the cause of slopping and spitting.
How does a cupola furnace work?
How does a cupola furnace work? The Cupola furnace works on the principle of combustion of coke generates (carbon dioxide and heat) and therefore it causes iron to melt. The melted iron gets a downgrade. The Cupola furnace works when electricity applies to the coil and therefore it causes iron to melt.
What is the difference between cupola furnace and blast furnace?
Basic chage for cupola consists of foundry coke layers and layers of pig iron, steel scrap, home returns and it is only used for melting . Where as blast furnace is a smelting furnace which means it is used for extraction of iron from ores.
What is the cupola furnace explain with diagram?
A cupola or cupola furnace is a melting device used in foundries that can be used to melt cast iron, Ni-resist iron and some bronzes. The cupola can be made almost any practical size. The size of a cupola is expressed in diameters and can range from 1.5 to 13 feet (0.5 to 4.0 m).
What is the main use of a cupola furnace?
Cupola furnace, in steelmaking, a vertical cylindrical furnace used for melting iron either for casting or for charging in other furnaces.
What should the height of a cupola furnace?
about 6m
Which material is most commonly used flux added to the charge in cupola furnace?
Which of the following chemical compound, is the most common flux added to the charge in a cupola furnace? Explanation: Limestone (CaCO3) is used as Flux in cupola furnace in a proportion of about 2-4% of the metal charge.
What furnace is cast iron made from?
Cast iron is sometimes melted in a special type of blast furnace known as a cupola, but in modern applications, it is more often melted in electric induction furnaces or electric arc furnaces. After melting is complete, the molten cast iron is poured into a holding furnace or ladle.
What are the advantages of cast iron?
The many benefits of using cast iron pans
- Cast iron is tough.
- Once cast iron is hot, it stays hot.
- Cast iron is great for keeping food warm since it holds heat for a considerable length of time.
- Every time you cook in your cast iron pans you are making them better by seasoning them.
Which type of material is cast iron?
Cast iron, an alloy of iron that contains 2 to 4 percent carbon, along with varying amounts of silicon and manganese and traces of impurities such as sulfur and phosphorus. It is made by reducing iron ore in a blast furnace.
Is Cast Iron harder than steel?
Steel and cast iron are both strong materials. Rule Of Thumb: Cast iron is harder and stronger, but it’s not as tough (it’s brittle). Steel is not as hard and strong, but it’s tougher.
Why is cast iron preferred over steel?
However, cast iron has better compressive strength than mild steel. Due to this, it will have greater resistance against breaking under compression. This also makes it quite durable and ideal for rugged use. It will not show signs of wear and tear easily and you can expect long term performance from cast iron.