1. A thermoelectric steam generation plant operates on a Rankine cycle with reheating and two boiler feed water heaters, one open and one closed. Steam enters the high pressure turbine at P8 and 500 ° C and the low pressure turbine at P10 and 500 ° C. The condenser pressure is 40 kPa. Steam is drawn from the turbine at a pressure P11 for the closed feed water heater and at a pressure P12 for the open feed water heater. In the closed heater, the feed water is heated to the saturation temperature of the extracted steam, this condensate is removed as a saturated liquid, it is throttled and goes to the open feed water heater. The isentropic efficiencies of the equipment that have this efficiency are listed in a later table. to. Determine the fractions of steam drawn from the turbine to the feedwater heaters. b. Determine the thermal efficiency and heat rate of the power. ̇ c. Determine the mass flow required for a power delivery net of ?net. d. Show the actual and theoretical cycle on a T-s diagram with respect to the saturation lines.
Variable | DATA | |
P8 | 16 MPa | |
P10 | 2.5 MPa | |
P11 | 0.59 MPa | |
P12 | 0.1 MPa | |
Wnet | 12 MW | |
Isentropic efficiency of turbines | 90 % | |
Isentropic efficiency of the pumps | 85 % |
1. A thermoelectric steam generation plant operates on a Rankine cycle with reheating and two boiler...
P8-29 A closed feedwater heater is used in a Rankine cycle Steam leaves the boiler at 20 MPa, 600°C. Between the high and low-pressure turbines, steam at 1 MPa is extracted and delivered to the closed feedwater heater. Feedwater exits the feedwater heater at 20 MPa and the saturation temperature of the 1-MPa steam; saturated liquid condensate is fed through a steam trap back to the condenser. Steam from the second- stage turbine enters the condenser at 10 kPa, and...
3. A water vapor thermoelectric plant operates in the regenerative Rankine cycle with two open feed water heaters as shown in the figure. The plant maintains the turbine inlet at 10 MPa and 600 ° C, and operates the condenser at 5 kPa. Steam is drawn from the turbine at 0.6 and 0.2 MPa. The water comes out of both feed water heaters as a saturated liquid. The isentropic efficiency for the turbine and the pumps is 90%. For a...
SP-25 Consider a regenerative steam power plant with one open feedwater heater and one closed feedwater heater. Superheated steam enters the turbine with a mass flow rate of 120 kg/s at 16 MPa and 560°C (State 1). Some fraction of the steam is extracted at 40 bar (State 2) and is supplied to the closed feedwater heater. The remaining steam expands to a pressure of 3 bar (State 3), another fraction is extracted at this pressure, and is supplied to...
A steam power plant operates on an ideal Rankine cycle with two of its feedwater heater closed as shown in the figure below and with a net power output of 105MW. The mass flow rate of the steam is 70kg/s and enters the high-pressure turbine at 6MPa and and leaves at 1.5 Mpa. a fraction of x of steam is extracted at this pressure to the closed feedwater. a fraction of y of steam is extracted from the second stage...
a) A steam power plant operates on an ideal reheat-regenerative Rankine cycle. Steam enters the high-pressure turbine (HPT) at a pressure of 10 MPa and temperature of 550°C. The steam expands through the HPT stage to a pressure of 0.6 MPa. Some of the steam at the end of the expansion process in HPT is extracted for a regeneration process in a closed-type feedwater heater. The steam leaves the heater as a saturated liquid and then is throttled to the...
Consider a reheat-regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an open feedwater heater. Steam enters the first turbine at 8.0 MPa, 480 C and expands to 0.7 MPa. The steam is reheated to 440°C before entering the second turbine, where it expands to the condenser pressure of 0.008 MPa Steam is extracted from the first turbine at 2 MPa and fed to the closed feedwater heater. Feedwater leaves the closed heater at 205 C...
Consider a reheat–regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an open feedwater heater. Steam enters the first turbine at 12.0 MPa, 520C and expands to 0.6 MPa. The steam is reheated to 480C before entering the second turbine, where it expands to the condenser pressure of 0.006 MPa. Steam is extracted from the first turbine at 2 MPa and fed to the closed feedwater heater. Feedwater leaves the closed heater at 205C and 8.0...
2) A steam power plant operates on an ideal regenerative rankine cycle with superheated steam leaving the boiler, entering the turbine at 10 mPa,600C. X fraction of steam is extracted from the turbine at 0.6 mPa pressure for the high pressure open feedwater heater. Then x fraction more of steam is extracted from the turbine at 0.2 mPa pressure for the low pressure open feedwater heater . The condenser pressure in the cycle is 5 kPa. The mass flow rate...
A basic Rankine cycle is to produce 200 MW of power. The inlet steam pressure can be no higher than 15 MPa, and the outside environment is 15 degrees Celsius. The isentropic efficiency of the turbine is 0.8, and the isentropic efficiency of the pump is 0.75. (a) Design a basic cycle, specifying state properties at each state, the required mass flow rate of the steam, the thermal efficiency of the cycle, and the required mass flow rate of either...
Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open one, and reheat. Steam enters the first turbine stage at 12 MPa, 480°C, and expands to 2 MPa. Some steam is extracted at 2 MPa and fed to the closed feedwater heater. The remainder is reheated at 2 MPa to 440°C and then expands through the second-stage turbine to 0.3 MPa, where an additional amount is extracted and fed into the open feedwater heater...