Question
In: Mechanical Engineering
A steam power plant with boiler use coal fuel with net heat 4000 kcal/kg and boiler...
A steam power plant with boiler use coal fuel with net heat 4000 kcal/kg and boiler efficiency 90%. If steam utrbine from the power plsnt generate power output 100 MW, at condition vapor enter at 10 MPa, 520oC and condensate to saturated liquid at 0.08 bar. If the isentropic efficiency turbine and pump is 90%, then
a) Calculate coal required (ton/hour)
b) Calculate netto efficiency of the power plant
c) Calculate Net Plant Heat Rate (kCal/kWh)
Solutions
samet mamat answered 2 years agoRelated Solutions
A steam power plant operates with a boiler that is heated from a heat source at...
A steam power plant operates with a boiler that is heated from a
heat source at 457 °C and produces 450 ton/hr. of steam. The steam
leaves the boiler at 425 °C and 4 MPa. The steam reaches a turbine
at 375 °C and 3 MPa and leaves it at 50 kPa with 4% liquid water.
This mixture is flown into a condenser that rejects the heat into a
river at 17 °C. Water leaves the condenser at 50 kPa...
Consider a coal-fired steam power plant that produces 175 MW of electric power. The power plant...
Consider a coal-fired steam power plant that produces 175 MW of
electric power. The power plant
operates on a simple ideal Rankine cycle with turbine inlet
conditions of
7 MPa and 550°C and a condenser pressure of 15 kPa. The coal has
a
heating value (energy released when the fuel is burned) of 29,300
kJ/kg.
Assuming that 75% of this energy is transferred to the steam in the
boiler
and that the pump has an efficiency of 80% and the...
At a steam power plant, steam engines work in pairs, the heat output of the first...
At a steam power plant, steam engines work in pairs, the heat
output of the first one being the approximate heat input of the
second. The operating temperatures of the first are 770 ∘C and 460
∘C, and of the second 435 ∘C and 280 ∘C.
A) If the heat of combustion of coal is 2.8×107J/kg, at what
rate must coal be burned if the plant is to put out 860 MW of
power? Assume the efficiency of the engines...
A coal-fired power plant uses 400 ◦C steam to turn a turbine. Afterwards, the steam is...
A coal-fired power plant uses 400 ◦C steam to turn a turbine.
Afterwards, the steam is condensed at a temperature of 25 ◦C. If
the plant burns 1 million kg of coal in one hour, running at
maximum efficiency, what is the amount of work that could be done
by the turbine in that hour? (Coal contains 27 kJ of energy per
g).
If a coal-fired power plant burns 2 kg of coal to produce electricity, and the electricity...
If a coal-fired power plant burns 2 kg of coal to produce
electricity, and the electricity is used to power an elevator motor
that is 60% efficient, how high can the elevator and passengers be
lifted up if their total mess is 1500 kg?
and then How many human workers using muscle power('energy
servants") would be needed to lift the elevator up to the same
height, if they had one minute to do so?
Assuming that one energy servant is...
A boiler of a thermoelectric power plant produces 1540.8 m3/h of saturated steam at 900 kPa
A boiler of a thermoelectric power plant produces 1540.8 m3/h of saturated steam at 900 kPa. Determine the mass flow rate of steam produced (kg/s).
Steam leaves the boiler of a 100 MW Rankine cycle power plant at 400°C and 3.5MPa....
Steam leaves the boiler of a 100 MW Rankine cycle power plant at
400°C and 3.5MPa. The Turbine has an isentropic efficiency of 85%
and exhausts at 15 kPa. In the condenser, the water is subcooled to
38°C by lake water at 13°C. The pump isentropic efficiency is 75%
Draw and label the T-s diagram (4 points) for this cycle and
determine: 1. The cycle’s thermal efficiency (7 points) 2. The mass
flow rate of the steam in the boiler...
Steam leaves the boiler of a 100 MW Rankine cycle power plant at 400°C and 3.5MPa....
Steam leaves the boiler of a 100 MW Rankine cycle power plant at
400°C and 3.5MPa. The Turbine has an isentropic efficiency of 85%
and exhausts at 15 kPa. In the condenser, the water is subcooled to
38°C by lake water at 13°C. The pump isentropic efficiency is
75%.
1. Draw and label the T-s diagram for this cycle
2. Determine the cycle’s thermal efficiency
3. Determine the mass flow rate of the steam in the boiler
(kg/h)
4. Determine...
A steam power plant receives heat from a furnace at a rate of 280 GJ/h. Heat...
A steam power plant receives heat from a furnace at a
rate of 280 GJ/h. Heat losses to
the surrounding air from the steam as it passes through the pipes
and other components
are estimated to be about 8 GJ/h. If the waste heat is transferred
to the cooling water at a rate
of 145 GJ/h, determine (a) net power output and (b) the thermal
efficiency of this
power plant
The net power of a combined gas-steam power plant is 450 MW. The pressure ratio of...
The net power of a combined gas-steam power plant is 450 MW. The
pressure ratio of the gas turbine cycle is 14, the air enters the
compressor at a temperature of 300 K and the turbine at a
temperature of 1400 K. Combustion end gases coming out of the gas
turbine produce steam at a waste heat boiler at 8 MPa pressure and
400 degrees Celsius temperature and exit the boiler at 460 K
temperature. The steam cycle has an...
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