A low volatile bituminous coal has the following analysis on an as-received basis: 10.76% M, 68.12% FC, 13.63% VCM, 0.94% N, 0.65% S, and 7.49% Ash. The calorific value of this coal was analyzed to be 30.45 MJ/kg. The coal was burned in a burner with excess air at 50 C at 750 mmHg and 15% RH. Partial dry analysis of the stack gas showed 8.05% CO2 and 3.87% CO. Stack gas leaves the burner at 300 C and 760 mmHg. Vapor pressure of water at 50 C is 92.53 mmHg.

a) Calculate the percentage excess air used for combustion (55%) b) Calculate the volume of wet air (m^3) per 100 g of coal (1.45) c) Calculate the percentage calorific value lost due to uncondensed water. Heat of vaporization of water is 44.01 kJ/mol at 25 C (4.76)

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