What present in blast furnace gas makes it poisonous?

What present in blast furnace gas makes it poisonous?

In blast furnace, some hydro cyanide (HCN) and cyanogen gas (CN2) can also formed due to the reaction of nitrogen in the hot air blast and carbon of the coke. The reaction is catalyzed by the alkali oxides. These gases are highly poisonous. BF gas can contain these cyano compounds in the range of 200 mg to 2000 mg/cum.

What is burden ratio in blast furnace?

During the period of blow-in, the burden ratio (ratio of the ore to coke) is adjusted according to a predetermined schedule until the normal operation of the blast furnace is achieved and the blast furnace starts producing the normal quality of the hot metal.

Which of the following gas is used in blast furnace?

Coke Gas, Blast Furnace Gas & Converter Gas Composition

Steel production gas type Coke Gas Blast Furnace Gas
Input Coal Coke & iron ore
Output Coke Pig iron
Hydrogen % 50-70% 5%
Methane % 25-30%

What three chemicals do we input into the blast furnace?

Coke, limestone flux, and iron ore (iron oxide) are charged into the top of the furnace in a precise filling order which helps control gas flow and the chemical reactions inside the furnace.

Why is it called a blast furnace?

The Blast Furnace is a large steel structure about 30 metres high. It is lined with refractory firebricks that can withstand temperatures approaching 2000oC. The furnace gets its name from the method that is used to heat it. Pre-heated air at about 1000oC is blasted into the furnace through nozzles near its base.

What is the waste gas in a blast furnace used for?

The gas product from iron ore smelting when hot air passes over coke in blast ovens; contains carbon dioxide, carbon monoxide, hydrogen, and nitrogen and is used as fuel gas.

Why is air blown into a blast furnace?

The preheated air reacts vigorously with the preheated coke, resulting in both the formation of the reducing gas (carbon monoxide) that rises through the furnace, and a very high temperature of about 1,650° C (3,000° F) that produces the liquid iron and slag.

How do you light a blast furnace?

To use the blast furnace you’ll need to place the item and fuel onto the blast furnace to change the state to ‘lit’. The item on the blast furnace will be smelted twice as fast a regular furnace, but fuel used on the blast furnace will also be used at double the rate.

What are the main parts of a blast furnace?

A blast furnace is a vertical reactor comprising an assembly of cylindrical or conical elements ( Figure 1). Among its most important features are the internal volume, which is determined by the diameter of the crucible, the furnace bottom, defined by the desired results, which collects both molten metal and slag.

Which fuel is best suitable for blast furnace process?

Which fuel is best suitable for blast furnace process? Explanation: Coke is best suitable for blast furnace process as it also acts as a reducing agent in smelting iron ore.

What is a blast furnace used for in real life?

Blast furnaces are used to produce pig iron from iron ore for subsequent processing into steel, and they are also employed in processing lead, copper, and other metals. Rapid combustion is maintained by the current of air under pressure.

How much dust is in a blast furnace?

The BF gas produced at the top of the blast furnace is water and dust laden. The water vapour content is around 20 grams to 115 grams per cum and the dust content is around 20 grams to 40 grams per cum. The particle size of the dust can vary from a few microns to 6 mm. The dust laden BF gas is cleaned in two stages.

How does moisture affect the Coke rate in a blast furnace?

Moisture content is a direct consequence of the coke quenching process with some dependence on size. High and variable moisture contents affect both the coke rate and the balances within the blast furnace, while high volatile matter contents cause operational problems in the cleaning of blast furnace gas.

Where does the gas come from in a blast furnace?

The process of liquid iron production in the blast furnace (BF) generates gas at the furnace top which is an important by-product of the BF process. This top gas of the blast furnace is at the temperature and pressure existing at the BF top and usually contaminated with dust and water particles.

How is BF gas cleaned in a blast furnace?

The dust laden BF gas is cleaned in two stages. In the first stage the coarse particles of the dust are removed in the dust catcher by first reducing the gas velocity and then by reversing the flow of the gas.