Question

b) Explain the different stages of combustion when woody biomass is burnt in a combustion chamber. Describe how to calculate the amount of air required for burning a biomass fuel with known proximate analysis and ultimate analysis. What are the major advantages of co- firing biomass with coal in existing coal-fired power stations? 6 marks e) What kind of gasifier is shown in the Figure below? Explain how it works? What application is the gasifier most suited for? 16 marks Biomass Air Drying (100C) Pyrolysis (300°C) Oxidation (1400C) Reduction (900 C) Ash Gas d) Describe the prevailing process conditions and corresponding products for hydrothermal carbonisation, hydrothermal liquefaction and hydrothermal gasification. Outline major production pathways of microalgal biofuels 17 marks

Answer 1

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