Question 1 500 MW Medupi power station generates electricity using coals of calorific value of 4890 kcal/kg. The thermal and electrical efficiency of the power station are 24% and 89,6%, respectively. 1.1 Determine the overall efficiency of the power station (%) and determine the electrical energy produced per hour (kWh) and determine the heat of coal combustion per hour (kcal) and lastly determine the amount of coals consumed per hour (tonnes)

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Question 1

500 MW Medupi power station generates electricity using coals of calorific value of 4890 kcal/kg. The thermal and electrical efficiency of the power station are 24% and 89,6%, respectively.

1.1 Determine the overall efficiency of the power station (%) and determine the electrical energy produced per hour (kWh) and determine the heat of coal combustion per hour (kcal) and lastly determine the amount of coals consumed per hour (tonnes)

1.2 Determine the amount of coals consumed per day if the daily load factor is 55%. (tonnes)

1.3 Determine the percentage savings of coal weight if the calorific value increases by 4% when purchasing new advanced coal.

Expert Solution
Medupi power station

Power Capacity of the power station=500 MW

Calorific value=4890 kcal/kg

Thermal efficiency=24%=0.24

electrical efficiency=89.6%=0.89

The overall efficiency of the power station in percentage

overall efficiency=Thermal efficiency × electrical efficiency

=0.24×0.89=0.2136

The percentage overall efficiency

=0.2136×100=21.36 %

 

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