A bituminous coal is burned with air in a boiler furnace. The coal is fed at a rate of 40,000 kg/h and has an ultimate analysis of 76wt% C, 5% H. 8% O, negligible amounts of N
- Prove that the air-to-fuel ratio is 16.1 standard cubic meters/kg coal and that the flue gas contains 4.6% H2O by volume.
- Calculate the rate of cooling required to cool the flue gas from 260°C to 150°C and the temperature to which the air is preheated. {Note: A trial-and-error calculation is required.)
- If 60% of the heat transferred from the furnace goes into producing saturated steam at 30 bar from liquid boiler feedwater at 50°C, at what rate (kg/h) is steam generated?
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