Allied & ICAR Exam Bank • ALLIED_1126 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Biomass Gasification

Question Statement:

A downdraft biomass gasifier consumes 15 kg of crop wood chips per hour (calorific value 16,000 kJ/kg) to produce producer gas having an energy output rate of 46.7 kW. The cold gas gasification efficiency (in %) is:

Answer Key:

70.0

Step-by-Step Solution & Explanation

Biomass energy input rate $= \frac{15\text{ kg/h} \times 16,000\text{ kJ/kg}}{3600\text{ s/h}} = 66.67\text{ kW}$. Cold gas efficiency $\eta = \frac{46.7}{66.67} \times 100 = 70.05\%$.
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