How does a hot blast stove work?

Asked By: Amarildo Jaeger | Last Updated: 23rd May, 2020
Category: business and finance metals industry
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A hot blast stove is a facility to supply continuously the hot air blast to a blast furnace. Before the blast air is delivered to the blast furnace tuyeres, it is preheated by passing it through regenerative hot blast stoves that are heated primarily by combustion of the blast furnace top gas (BF gas).

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Likewise, how does a blast furnace stove work?

The hot blast air is produced by passing cold blast air through preheated chambers or 'stoves', and heating the air to above 1000°C. The stove is first heated up by burning gas and combustion air within the chamber and allowing the heat to be absorbed into the brickwork, or 'chequerwork'.

Additionally, how hot are blast furnaces? The hot blast is directed into the furnace through water-cooled copper nozzles called tuyeres near the base. The hot blast temperature can be from 900 °C to 1300 °C (1600 °F to 2300 °F) depending on the stove design and condition. The temperatures they deal with may be 2000 °C to 2300 °C (3600 °F to 4200 °F).

Beside this, why is hot air used in blast furnace?

The hot air blast to the furnace burns the coke and maintains the very high temperatures that are needed to reduce the ore to iron. The reaction between air and the fuel generates carbon monoxide. This gas reduces the iron (III) oxide in the ore to iron.

Who invented hot blast?

James Beaumont Neilson

23 Related Question Answers Found

What is hot blast stove?

A hot blast stove is a facility to supply continuously the hot air blast to a blast furnace. Before the blast air is delivered to the blast furnace tuyeres, it is preheated by passing it through regenerative hot blast stoves that are heated primarily by combustion of the blast furnace top gas (BF gas).

Why is limestone added to the blast furnace?

The main role of limestone in extraction of iron is to decomposes in hot furnace and form the calcium oxide. Iron is extracted from its ore, haematite, in a blast furnace. The limestone decomposes in the hot furnace, forming calcium oxide. This reacts with the sandy impurities (silicon dioxide) to form a slag.

What fuel is used in blast furnace?

The furnace is fed with iron ore, pellets, and/or sinter, flux and slag producing material such as limestone or dolomite, and coke for fuel. The blast air causes the iron oxides, flux, and coke to react and iron, carbon monoxide and blast-furnace slag is produced.

Why is it called a blast furnace?

Blast furnace is known because his process by which preheated high pressure (blast air) air is entered in furnace through numbers of tuyere as per capacity of furnace in tuyere Zone is above the Tapping Hole and hold the charged burden from Top of furnace which is pressured furnace tataly sealed from atmosphere

Why Coke is used in blast furnace?


Coke is used as a fuel and as a reducing agent in smelting iron ore in a blast furnace. The carbon monoxide produced by its combustion reduces iron oxide (hematite) in the production of the iron product. Coke is commonly used as fuel for blacksmithing.

Why zinc Cannot be extracted in blast furnace?

Why is zinc not extracted from zinc oxide through reduction using CO? The standard Gibbs free energy of formation of ZnO from Zn is lower than that of CO2 from CO. Therefore, CO cannot reduce ZnO to Zn. Hence, Zn is not extracted from ZnO through reduction using CO.

What are the main parts of a blast furnace?

This Iron is called Pig Iron and is used to make Cast Iron.
  • The Charge. The Charge consists of 3 parts :
  • The Exhaust Gas Outlet.
  • Charging Bells.
  • Gas Outlet.
  • Melting Iron Ore, Coke and Limestone.
  • Taphole.
  • Slag Hole.
  • Bustle Pipe.

What can you smelt in a blast furnace?

Blast furnaces are similar to furnaces, but can smelt only ore blocks and tools/armor made of iron, gold or chainmail. Once an item and a fuel are placed into the blast furnace, the block state changes to lit and the item is smelted twice as fast as a regular furnace.

Why is iron from a blast furnace hard but brittle?

Iron from the blast furnace contains about ~96% iron with ~4% of impurities including carbon, silica and phosphorus. In this state the cast iron is too hard and too brittle for most purposes. However, if all the impurities are removed, the resulting very pure iron is too soft for any useful purpose.

How is slag removed?


How is slag removed from molten iron? Slag is less dense than iron so it floats on the surface. In a blast furnace the hot metal comes out of the tap hole in the side of the furnace and goes down a trough or runner.

How is iron removed from a blast furnace?

The blast furnace
Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as haematite contain iron(III) oxide, Fe 2O 3. The oxygen must be removed from the iron(III) oxide in order to leave the iron behind. Reactions in which oxygen is removed are called reduction reactions.

What is the hottest furnace on earth?

According to the World Meteorological Organization (WMO), the highest registered air temperature on Earth was 56.7 °C (134.1 °F) in Furnace Creek Ranch, California, located in the Death Valley desert in the United States, on July 10, 1913, but the validity of this record is challenged as possible problems with the

Why Dolomite is used in blast furnace?

High silica (SiO2) content in the dolomite used for sintering purpose is preferred since SiO2 counter the effect of alumina (Al2O3) in the blast furnace. But the second role of calcined dolomite is the more important role. In this role it is used to protect the magnesia-carbon lining of the steelmaking vessel.

Is burning coke in a blast furnace exothermic or endothermic?

The Blast Furnace
The coke (essentially impure carbon) burns in the blast of hot air to form carbon dioxide - a strongly exothermic reaction. This reaction is the main source of heat in the furnace.

How pig iron is produced in blast furnace?


Blast furnaces produce pig iron from iron ore by the reducing action of carbon (supplied as coke) at a high temperature in the presence of a fluxing agent such as limestone.

Why is Coke needed for steel?

Coke is used as a fuel and a reducing agent in melting iron ore. It is produced by baking coal until it becomes carbon by burning off impurities without burning up the coal itself. When coke is consumed it generates intense heat but little smoke, making it ideal for smelting iron and steel.

How do you start a blast furnace?

The Blast Furnace can be accessed in East Keldagrim by going downstairs in the building with the furnace icon.
  1. Start The Giant Dwarf to gain access to Keldagrim.
  2. Smithing level 60 (cannot be boosted) or a 2500-coin fee to smelt bars with the furnace for 10 minutes.