Which fuel gas pair shows a volumetric calorific value (C.V.) where one is nearly double the other (in kcal/Nm3), while their gravimetric C.V. (in kcal/kg) remains identical?
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Answer: D. B.F gas and coke oven gas
Explanation
Calorific value measures the thermal energy released during the complete combustion of a fuel gas. Volumetric calorific value is measured per normal cubic meter of gaseous fuel volume. Blast furnace gas and coke oven gas exhibit a volumetric ratio of roughly one to two. Gravimetric calorific value evaluates energy release per unit mass of the fuel mixture. Coke oven gas contains high hydrogen fractions, giving it a much higher energy density by volume. Blast furnace gas contains large amounts of inert nitrogen and carbon monoxide, lowering its volumetric value.
Steel plants blend various industrial fuel gases to maintain stable burner combustion temperatures. Energy management systems calculate fuel gas requirements based on accurate calorific value data. Understanding fuel properties ensures efficient operation of reheating furnaces and boilers. Option A compares propane and acetylene, which have different gravimetric energy characteristics. Option B compares propane and LPG, which share similar high volumetric energy densities. Option C compares sewage and gobar biogas, which both originate from organic anaerobic digestion.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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