Question
In: Chemistry
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, and the exhaust gases leave the same exchanger at 200 ºC. Steam leaves the high-pressure turbine at 1 MPa and is reheated to 400 ºC in the heat exchanger before it expands in the low-pressure turbine. Assuming 80 percent isentropic efficiency for all pumps and turbines,
1) determine the enthalpy of air at the compressor outlet.
2) determine the enthalpy of air at the turbine outlet
3) determine the enthalpy of steam-water mixture at the low pressure turbine outlet
4) determine the moisture content at the exist of the low-pressure turbine
5) determine the steam temperature at the inlet of the high-pressure (hint: trial and error)
6) determine the net power output of the combined plant
7) determine the thermal efficiency of the combined plant
Solutions
queen_honey_blossom 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,...
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...
Prob.1) Consider a combined gas and steam power plant that has a net power output of...
Prob.1) Consider a combined gas and steam power plant that has a
net power output of 450 MW. The pressure ratio of the gas turbine
cycle is 14. Air enters the compressor at 300 K and the turbine at
1 400 K. The combustion gases leaving the gas turbine are used to
heat the steam to 8 MPa. up to 400 ° C in a heat exchanger. The
combustion gases exit the heat exchanger at 460 K. An open
feedwater...
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...
Consider a steam power plant operating on a simple ideal Rankine cycle in which the steam...
Consider a steam power plant operating on a simple ideal Rankine
cycle in which the steam enters the turbine at 3 MPa and 350C and
is condensed in the condenser at 75 kPa. Determine the thermal
efficiency of this cycle and sketch an appropriately labeled T-s
diagram. Also compare this thermal efficiency to that a Carnot heat
engine operating between these same two limits.
The change in enthalpy across the pump = work done by the pump:
h2-h1= v1(P2– P1)
Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine...
Consider a steam power plant operating on the simple ideal
Rankine cycle. Steam enters the turbine at 15 MPa and 600°C. The
steam condenses in the condenser at 10 kPa. Use the EES software to
study the effects of the following cases on the cycle performance
and to sketch the T-s diagram for each case:
Plot the variation of the cycle thermal efficiency with the
turbine isentropic efficiency. Take the isentropic efficiency of
the turbine in the range 70% to...
Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine...
Consider a steam power plant operating on the simple ideal
Rankine cycle. Steam enters the turbine at 15 MPa and 600°C. The
steam condenses in the condenser at 10 kPa. Use the EES software to
study the effects of the following cases on the cycle performance
and to sketch the T-s diagram for each case:
#Plot the variation of the cycle thermal efficiency with the
turbine isentropic efficiency. Take the isentropic efficiency of
the turbine in the range 70% to...
A stationary power plant operates on Brayton cycle has a pressure ratio of 8. The gas...
A stationary power plant operates on Brayton cycle has
a pressure ratio of 8. The gas
temperature is 300 K at the compressor inlet and 1300 K at the
turbine inlet. Assuming
a compressor efficiency of 80 percent and a turbine efficiency of
85 percent, determine:
1) the gas temperature at the exits of the compressor
and the turbine,
2) the back work ratio,
3) the thermal efficiency of the cycle,
4) the thermal efficiency of the gas-turbine power plant...
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
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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