Question:
The primary reason for tapering of blast furnace walls in the bosh region is to:
The primary reason for tapering of blast furnace walls in the bosh region is to:
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Furnace geometry is designed to match shrinking burden volume in lower zones.
Updated On: Jun 29, 2026
- Compensate for decrease in apparent burden volume
- Improve slag foaming
- Increase heat losses
- Increase raceway depth
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The Correct Option is A
Solution and Explanation
Concept:
In a blast furnace:
- burden descends and undergoes softening and melting
- volume of solid burden decreases in lower zones
- geometry is designed to maintain uniform descent and gas flow
Step 1: Understand bosh region behavior.
In bosh: - ore softens and shrinks - void fraction changes - burden volume decreases significantly
Step 2: Need for tapering.
To maintain: - smooth descent of burden - uniform gas flow - constant pressure drop The furnace is tapered.
Step 3: Evaluate options.
(A) compensates volume reduction → correct (B) slag foaming → unrelated (C) heat loss → undesirable (D) raceway depth → tuyere region effect Final Answer: \[ \boxed{\text{Compensate for decrease in burden volume}} \]
Step 1: Understand bosh region behavior.
In bosh: - ore softens and shrinks - void fraction changes - burden volume decreases significantly
Step 2: Need for tapering.
To maintain: - smooth descent of burden - uniform gas flow - constant pressure drop The furnace is tapered.
Step 3: Evaluate options.
(A) compensates volume reduction → correct (B) slag foaming → unrelated (C) heat loss → undesirable (D) raceway depth → tuyere region effect Final Answer: \[ \boxed{\text{Compensate for decrease in burden volume}} \]
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