A 600-M W_e power plant burns Alabama, Jefferson, St. Clair coal with average mo

Question

A 600-M W_e power plant burns Alabama, Jefferson, St. Clair coal with average moisture and ash fractions of 18 and 15 percent, respectively. This plant operates with a heat rate of 9000 Btu/kWh. An analysis of the refuse pit gives a higher heating value of 2742 kJ/kg. An or sat analysis of the flue gas gives 12.78% CO_2, 5.49% O_2, and 1.75% CO. Find: The thermal efficiency of the power plant. The coal rate. The dilution coefficient and percent excess air. Compare between the mass rate of the freed draft fan and the mass rate of the induced draft fan if atmospheric conditions are 44 degree C, 0.93 atm. and a relative humidity of 55%. The exhaust gas is at 300 degree C. 0.88 atm.

Explanation / Answer

The answer of the folllwing question is as follows .

The thermal efficiency of the plant is 89% .

The coal consumption rate is 67kg/min.

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