Discussion
The constituent of producer gas which occupies the highest percentage by volume and helps in increasing its overall calorific value is
Answer: A
The constituent is CO, carbon monoxide.
Producer gas from a wood or charcoal gasifier is typically about 20-25% CO, 12-18% H2, 1-3% CH4, 8-12% CO2 and roughly half nitrogen. Nitrogen is the largest constituent but is inert, so among the gases that add heating value, carbon monoxide occupies the largest volume and contributes most of the calorific value.
CO2 is an incombustible diluent that lowers the calorific value. Hydrogen is combustible but present in a smaller share than CO. Methane has the highest heating value per cubic metre, but there is only a few per cent of it.
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