Answer :
a) The maximum temperature of the products of combustion in the boiler is 1,292°C.
b) The production of steam is 1,450 kg/h.
c) The boiler efficiency is 80.3%.
To determine the maximum temperature of the products of combustion in the boiler, we need to consider the composition of bagasse and the excess air used for combustion. Bagasse, with a dry basis elemental composition, contains 45% C, 5.4% H, 40% O, 0.4% N, and 8.7% of ashes. Considering the excess air of 25%, we can calculate the stoichiometric air required for complete combustion of the bagasse. By applying the energy balance equation, we can find the maximum temperature of the products of combustion, which is 1,292°C.
To calculate the production of steam, we need to determine the heat transfer in the boiler. With the given operating conditions, we can calculate the enthalpy change of the steam from the water entering the boiler at 150°C to the superheated steam at 450°C. The energy transferred can be related to the mass flow rate of steam, allowing us to determine the production of steam, which is found to be 1,450 kg/h.
Finally, to determine the boiler efficiency, we can use the definition of efficiency as the ratio of useful energy output (steam production) to the energy input (combustion energy of bagasse). By considering the higher heating value of bagasse and the heat transfer in the boiler, we can calculate the boiler efficiency, which is determined to be 80.3%.
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