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.

(d) Find the steam-turbine power, the gas-turbine power, and the total efficiency of the combined cycle.

Solutions

Expert Solution

samet mamat answered 1 year ago

Next > < Previous

Related 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...

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 combustor after suffering a pressure loss of 2.5% of the compressor exit pressure 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 operates as a cold-air standard Brayton cycle. Air enetrs the compressor at 300K...

A gas turbine operates as a cold-air standard Brayton cycle. Air enetrs the compressor at 300K and 100kPa and is compressed to 700kPa. During the heat addition process in the combustor, the temperature of the air increases to 1000K. The turbine and compressor can be assumed to be operating isentropically. Evaluate specific heat at 300K. a. thermal efficiency of the cycle? b. net work of the cycle (kj/kg)? c. Back work ratio?

Design a gas power plant that works as a non-ideal Regenerative Brayton cycle by determining the...

Design a gas power plant that works as a non-ideal Regenerative Brayton cycle by determining the pressure ratio required to optimize the net power output of the cycle. The minimum cycle temperature is 300 K while the maximum cycle temperature is 1780 K. The isentropic efficiency of the turbine is 85% while that of the compressor is 75%. The effectiveness of the regenerator is to be taken as 0.8 while the gas flow rate is 30 kg/s. A T-s diagram...

Subjects