Discussion
Producer gas has a low calorific value chiefly because it contains a large proportion of
Answer: C
Correct answer: nitrogen from the air blown through the bed
Producer gas is made by blowing air through a hot fuel bed, and the nitrogen that accompanies the oxygen passes through unchanged, ending up as roughly half the product by volume. It carries no heat of combustion but must still be heated, so it dilutes the gas to about 1000 to 1200 kcal/m³. Water gas, made with steam instead of air, avoids the nitrogen and has a much higher value.
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