Please answer Questions e-f-g-h: (a) The boiler of a power plant operates at a maximum temperature...
Please answer Questions e-f-g-h:
(a) The boiler of a power plant operates at a maximum
temperature of 750oC. The condenser of the power plant draws in
cooling water at 20oC. What is the theoretical maximum efficiency of
the plant?
(b) Now suppose that a real power plant is built to have an
efficiency that is 80% of the theoretical efficiency. The power plant
needs to generate 1GW (giga-watt) of power. How much energy (per
second) needs to be supplied by the boiler? How much energy needs
to be removed by the cooling water?
(c) If the boiler burns coal that comes from Central Appalachia
that has a heating value of 12500 BTU/lbm, how much coal (in kg) is
needed for one day?
(d) Coal enters the power plant by a coal train that is composed
for coal cars that can each hold 120 tons of coal. How many cars
are needed for the power plant in a day? If one train can haul 100
coal cars, how many trains will need to ply to this power plant in
a week?
(e) The density of coal from Central Appalachia is around 55
lb/ft3. Determine how much volume of coal would be needed to run
the plant for a week? Coal mining is done by mountain top removal.
There are plenty of videos and websites talking about this process.
Think through what this means for a mountain? i.e. how much of a
mountain is removed? How much material that is not useful coal
(such as rock, dirt etc.) would have to be removed?
(f) The current cost of coal from Central Appalachia is around
$53.00 per short ton where 1 short ton = 907 kg. How much does the
power plant spend in coal per month?
(g) The cost of electricity from coal is about $50/MWh where MWh
stands for megawatt-hour. Use the definition of kilowatt-hour. What
fraction of the cost the cost of electricity is the fuel
cost?
(h) The boiler operates at a pressure of 60 bar (i.e. 60 atm) and
has a maximum temperature of 750oC. Water enters the boiler at
80oC. (Use steam tables or use online calculators). Determine the
amount of heat required for producing 1 kg of steam. How much water
would be needed per second? (Use the answer from Problem 1b).
Homework Answers
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Please answer Questions e-f-g-h:
(a) The boiler of a power plant operates at a maximum
temperature...
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please answer all of question 9 thank you pdf 9: Liquid water at a pressure of...
please answer all of question
9 thank you
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please answer all of question
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pdf 9: Liquid water at a pressure of 8 MPa and temperature of 60c enters a boiler at a rate of 240 kg/sec. The water leaves as steam at a pressure of 8 MPa and a pressure of 420 C. How many tons of coal per hour are needed for this boiler if the heat exchanger efficiency in the combustion chamber is 92%. Coal has a heat content of 26 million B...
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