Combustion and Fuels
This chapter covers the various types of fuels used in combustion processes, including solid, liquid, and gaseous fuels, along with their characteristics. It also explains the stoichiometry and analysis of combustion reactions, the application of the first law of thermodynamics in combustion, methods for calculating heat using enthalpy tables, and the determination of adiabatic flame temperature. Additionally, it discusses chemical equilibrium and the use of Gibbs free energy in analyzing equilibrium composition.
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What we have learnt
- Different types of fuels include solids like coal and liquids like petrol, each having specific characteristics such as calorific value and moisture content.
- Understanding stoichiometry is essential in calculating the air-fuel ratio, excess air, and the equivalence ratio in combustion processes.
- The analysis of exhaust gases helps determine combustion efficiency and completeness.
Key Concepts
- -- Calorific Value
- The amount of energy produced by burning a specific quantity of fuel, measured as Higher Heating Value or Lower Heating Value.
- -- Stoichiometric AirFuel Ratio (AFR)
- The ideal ratio of air to fuel that allows for complete combustion without excess air or fuel.
- -- Gibbs Free Energy
- A thermodynamic potential that measures the maximum reversible work obtainable from a system at constant temperature and pressure, relevant for equilibrium conditions.
- -- Adiabatic Flame Temperature
- The theoretical temperature of the products of combustion when no heat is lost to the surroundings, dependent on initial conditions and compositions.
Additional Learning Materials
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