Question:
Which factor mainly controls permeability in the bosh region of a blast furnace?
Which factor mainly controls permeability in the bosh region of a blast furnace?
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Permeability in bosh region is mainly controlled by coke skeleton stability.
Updated On: Jun 29, 2026
- Slag basicity
- Coke strength and size
- Iron ore reducibility
- Blast temperature
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The Correct Option is B
Solution and Explanation
Concept:
In a blast furnace, the bosh region is the zone where:
- softening and melting of burden occurs
- gas–solid permeability becomes critical
- coke acts as the main structural support
Permeability is the ability of gases to flow through the burden.
Step 1: Understand role of coke.
Coke forms the main rigid skeleton in the lower furnace: - maintains void spaces - supports burden when ore softens Thus coke governs gas flow paths.
Step 2: Effect of coke size and strength.
- Larger coke → higher void fraction → better permeability - Strong coke → resists degradation → maintains channels Hence permeability depends strongly on coke properties.
Step 3: Evaluate options.
(A) Slag basicity → affects chemistry, not permeability directly (B) Coke strength and size → correct (C) Reducibility → affects reaction rate, not flow paths (D) Blast temperature → thermal factor Final Answer: \[ \boxed{\text{Coke strength and size}} \]
Step 1: Understand role of coke.
Coke forms the main rigid skeleton in the lower furnace: - maintains void spaces - supports burden when ore softens Thus coke governs gas flow paths.
Step 2: Effect of coke size and strength.
- Larger coke → higher void fraction → better permeability - Strong coke → resists degradation → maintains channels Hence permeability depends strongly on coke properties.
Step 3: Evaluate options.
(A) Slag basicity → affects chemistry, not permeability directly (B) Coke strength and size → correct (C) Reducibility → affects reaction rate, not flow paths (D) Blast temperature → thermal factor Final Answer: \[ \boxed{\text{Coke strength and size}} \]
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