What are the primary constituents of blast furnace gas_________________?
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Answer: C. N2 & CO
Explanation
Iron ore reduction reactions in blast furnaces generate massive volumes of carbon monoxide. Nitrogen from the blast air passes through the furnace unchanged and dilutes the off-gas. Carbon monoxide and nitrogen together make up the overwhelming majority of blast furnace gas. Blast furnaces smelt iron oxides using coke and heated air blown from the bottom. The rising gases transfer thermal energy and reduce iron ore into liquid pig iron. Off-gases are cleaned of dust particles before being reused as a secondary fuel plantwide.
Blast furnace gas has a relatively low heating value due to its high nitrogen content. Steel mills capture this byproduct gas to fire reheating furnaces and power plant boilers. Handling this gas requires strict safety protocols because carbon monoxide is extremely toxic. Option A lists methane which is a minor trace component rather than a primary constituent. Option B includes hydrogen, but nitrogen and carbon monoxide are the dominant volumetric gases. Option D is incorrect because carbon dioxide is present only in lower concentrations.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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