Question
In: Mechanical Engineering
A combined cycle power system uses a simple gas-turbine Brayton cycle in conjunction with a simple...
A combined cycle power system uses a simple gas-turbine Brayton cycle in conjunction with a simple Rankine cycle to produce a total power of 100 MW. In such configuration, the exhaust stream from the gas turbine is used as the heat source for the steam power cycle in a heat exchanger as shown in the figure. The following data are known for the gas-turbine cycle. Atmospheric air enters the compressor at 100 kPa and 20oC, the compressor pressure ratio is 8, the compressor isentropic efficiency is 85%, the maximum gas cycle temperature is 1100oC, and the gas turbine isentropic efficiency is 90%. Additionally, it is known that the gas stream leaves the heat exchanger at the saturation temperature of the steam flowing through it. The following data are known for the steam-turbine cycle. Steam flows through the heat exchanger with a pressure of 6000 kPa, leaving at 320oC, the steam-cycle condenser operates at 20 kPa, and the isentropic efficiency of the steam turbine is 90%.
(a) Schematically draw the complete system including all the equipment required for the analysis. Additionally, sketch the corresponding thermodynamic diagrams for the Brayton and Rankine cycles involved. Assign a different number to each stream and use such number in the diagrams.
(b) Find the power generation efficiency of the gas-turbine.
(c) Find the power generation efficiency of the Rankine cycle.
(d) Find the steam-turbine power, the gas-turbine power, and the total efficiency of the combined cycle.
Solutions
samet mamat answered 2 years agoRelated Solutions
Consider a combined gas-steam power cycle. The topping cycle is a simple Brayton cycle that has...
Consider a combined gas-steam power cycle. The topping cycle is
a simple Brayton cycle that has a pressure ratio of 7. Air enters
the compressor at 15 ºC at a rate of 10 kg/s and the gas turbine at
950 ºC. The bottoming cycle is a reheat Rankine cycle between the
pressure limits of 6 MPa and 10 kPa. Steam is heated in a heat
exchanger at a rate of 1.15 kg/s by the exhaust gases leaving the
gas turbine,...
Consider a combined gas-steam power cycle. The topping cycle is a simple Brayton cycle that has...
Consider a combined gas-steam power cycle. The topping cycle is
a simple Brayton cycle that has a pressure ratio of 7. Air enters
the compressor at 15 ºC at a rate of 10 kg/s and the gas turbine at
950 ºC. The bottoming cycle is a reheat Rankine cycle between the
pressure limits of 6 MPa and 10 kPa. Steam is heated in a heat
exchanger at a rate of 1.15 kg/s by the exhaust gases leaving the
gas turbine,...
A gas-turbine power plant operates on the simple Brayton cycle with air as the working fluid...
A gas-turbine power plant operates on the simple Brayton cycle
with air as the working fluid and delivers 32 MW of power. The
minimum and maximum temperatures in the cycle are 310 and 900 K,
and the pressure of air at the compressor exit is 8 times the value
at the compressor inlet. Assuming an isentropic efficiency of 80%
for the compressor and 86% for the turbine, determine the mass flow
rate of air through the cycle. Account for the...
A gas-turbine power plant operates on the simple Brayton cycle between the pressure limits of 100 and 1200 kPa.
A gas-turbine power plant operates on the simple Brayton cycle between the pressure limits of 100 and 1200 kPa. The working fluid is air, which enters the compressor at 300K at a rate of 150 m3/min and leaves the turbine at 773K. Using variable specific heats for air and assuming a compressor isentropic efficiency of 82 percent and a turbine isentropic efficiency of 88 percent, determine:
(a) the net power output
(b) the back work ratio
(c) the thermal efficiency
. Air enters the compressor of a gas turbine power plant operating on Brayton cycle at...
. Air enters the compressor of a gas turbine power plant
operating on Brayton cycle at 14.5 psia and 540° R. The pressure
ratio across the turbine and compressor is same, which is equal to
6. Assume that the compressor work as 0.4 times the turbine work.
Take K=1.4 a) Draw the T-S diagram of the cycle. [2] b) Calculate
the maximum temperature in the cycle. [3] c) Calculate the cycle
efficiency
a gas turbine power plant operating on brayton cycle with a fuel compressor isentropic efficiency of...
a gas turbine power plant operating on brayton cycle with a fuel
compressor isentropic efficiency of 80 and turbine isentropic
efficiency of 85 percent and it has a pressure ratio of rp. The gas
temperature is 300K at a compressor inlet and 1300K at the turbine
inlet. Heat is received from a source of 1700K. Utilizing the
air-standard assumption (Hot Assumption) and for pressure ratio rp
which varies from 3 to 10, determine:
a) The gas temperature at the exits...
A micro gas turbine is designed to operate on the regenerative Brayton cycle and is sized...
A micro gas turbine is designed to operate on the regenerative
Brayton cycle and is sized to produce 400kW of net
electric power. Air enters the compressor at
100kPa and 300K (dead state), and is
compressed in a centrifugal compressor with a
polytropic efficiency of 86%. The air leaving the
compressor enters a recuperator with
an 90% effectiveness and is heated before it enters the
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in the...
jhmjhhjjhbus 5 is a Combined Cycle Gas Turbine (CCGT) power plant beside the sea , built...
jhmjhhjjhbus 5
is
a
Combined Cycle Gas Turbine
(CCGT) power plant beside the sea
, built on a
vast area next to a rural/
village setting. The fishing vil
lage houses a community of about
1300
people who live on a
day-
to
-day simple livelihood. Discuss
the positive and negative impac
t of
the power
plant on the environment and culture of this community.
Generator bus 5 is
a
Combined Cycle Gas Turbine
(CCGT) power plant beside the sea...
In a combined cycle of gas turbine, can a steam turbine drive the same generator driven...
In a combined cycle of gas turbine, can a steam turbine drive
the same generator driven by the gas turbine? Or it must drives a
separate generator?
Also, is there any gas power station that uses a gas other than
natural gas? Please give an example. Also, is there a gas power
station that uses synthesis gas?
A gas turbine power plant operates on a Brayton cycles has a pressure ratio of 7....
A gas turbine power plant operates on a Brayton cycles
has a pressure ratio of 7. Air enters the
compressor at 300 K. The energy in the form of heat is transferred
to the air in the amount of 950
kJ/kg. Using a variable specific heat for air and assuming the
compressor isentropic efficiency is
83 percent and turbine isentropic efficiency is 85 percent.
Determine the followings:
(i) The highest temperature in the cycle [5 marks]
(ii) The net work...
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