Question

The important reactions that occur in tuyeres region in blast furnace is:

• A. Slag melting
• B. Combustion of coke
• C. Reduction of iron oxides
• D. Solution loss reaction

Hint:

The tuyeres region is the hottest zone in a blast furnace where \textbf{coke burns in oxygen} to generate the heat needed for downstream reactions.

Answer 1

The Correct Option is B

Step 1: Understanding the Tuyeres Region
The tuyeres region in a blast furnace is the zone just above the hearth where hot air (blast) is injected into the furnace through tuyeres. This region is extremely hot and plays a critical role in fuel combustion and gas generation. Step 2: Key Reaction — Combustion of Coke
In this high-temperature zone, coke undergoes combustion with the oxygen in the blast air: \[ \text{C (coke)} + \text{O}_2 \rightarrow \text{CO}_2 \] This reaction is exothermic and releases a large amount of heat, raising the temperature to about 1900–2000°C. This is essential for melting iron and slag lower in the furnace. Step 3: Evaluating Other Options
- (A) Slag melting: Occurs lower in the hearth.
- (C) Reduction of iron oxides: Primarily happens in the upper and middle zones.
- (D) Solution loss reaction: Occurs above the tuyeres zone at slightly lower temperatures. Conclusion: The main reaction in the tuyeres region is the combustion of coke.