Question
In: Mechanical Engineering
Q. No.1A regenerative Rankine cycle operates with superheat, 2 stages of expansion and one open feed...
Q. No.1A regenerative Rankine cycle operates with superheat, 2 stages of expansion and one open feed heater. The cycle parameters are: Boiler exit pressure 100 bar Super heater exit temperature 600°C Condenser pressure 0.1 bar Turbine isentropic efficiency 100% Assume that the feed pump work can be neglected.
i. Determine the optimal inter-stage pressure by selecting the nearest value from the Saturated Water and Steam tables. i.e. do not interpolated between tabulated values. [2 marks]
ii. Sketch the feed heater layout, indicating the fluid streams entering and leaving the feed heater, undertake and energy balance on the feed heater and hence calculate the fraction of steam bled from the turbine. [2 marks]
iii. Calculate the plants thermal efficiency and its specific steam consumption.
iv. State clearly the thermodynamic reasons for the difference in performance between this cycle and similar cycle using a closed feed heater if the closed feed heater operated according the assumptions. What is the disadvantage of using an open feed heater? [2 marks]
v. Draw a schematic diagram of the plant layout and the associated thermodynamic cycle on a T-s diagram.
Solutions
samet mamat answered 3 months agoRelated Solutions
Consider a regenerative Rankine cycle with one steam extraction point using an open feed-water heater (OFWH)....
Consider a regenerative Rankine cycle with one steam
extraction point using an
open feed-water heater (OFWH).
P at boiler = 5 MPa
T at turbine inlet = 600 0C
P at OFWH = 1 MPa
P at condenser = 10 kPa
All device efficiencies = 1
Solve the problem analytically step by step; find all work
interactions, heat transfers, and
the thermal efficiency.
A steam power plant operates on a regenerative Rankine cycle with two feedwater heaters, one closed...
A steam power plant operates on a regenerative Rankine
cycle with two feedwater heaters, one closed and one open. Steam
enters the turbine at 12.5 MPa and 550ºC and exhausts to the
condenser at 10 kPa. Steam is extracted from the turbine at 1 MPa
for the closed feedwater heater and 0.8 MPa for the open one. The
feedwater is heated to the condensation temperature of the
extracted steam in the closed feedwater heater. The extracted steam
leaves the closed...
An ideal Rankine cycle operates without superheat (wet cycle) as shown in the following T-s diagram....
An ideal Rankine cycle operates without superheat (wet cycle) as
shown in the following T-s diagram. If saturated steam is expanded
from 450 psia to steam with 5 % moisture, use the Mollier diagram
and steam tables, as necessary, to determine the pump inlet
temperature, in oF. State your answer to one decimal place.
A regenerative Rankine cycle operates with inlet conditions of 800°C and 5MPa and exhausts to a...
A regenerative Rankine cycle operates with inlet conditions of
800°C and 5MPa and exhausts to a pressure of 10kPa. A single
open-feedwater heater is used with an extraction pressure of 0.8
MPa. Assume the exit states of the condenser and the feedwater
heater are both saturated liquids. The turbine and pump isentropic
efficiencies are 100%.
Draw the T-s diagram and determine the thermal efficiency for
the cycle and the total turbine work per unit boiler mass flow rate
(kJ/kg)
Repeat...
Consider a steam power plant that operates on a regenerative Rankine cycle and has a net...
Consider a steam power plant that operates on a regenerative
Rankine cycle and has a net power output of 150 MW. Steam enters
the turbine at 10 MPa and 500°C and the condenser at 10 kPa. The
isentropic efficiency of the turbine is 80 percent, and that of the
pumps is 95 percent. Steam is extracted from the turbine at 0.5 MPa
to heat the feedwater in an open feedwater heater. Water leaves the
feedwater heater as a saturated liquid....
A regenerative gas-turbine power plant with two stages of compression and two stages of expansion operates...
A regenerative gas-turbine power plant with two stages of
compression and two stages of expansion operates on a Brayton cycle
with a pressure ratio across the two-stage compressor of 12. Air
enters the first stage of the compressor at 100 kPa and 300 K. At
the intercooler exit, the temperature is 300 K. In both turbine
stages, air enters at 1400 K. The total heat transfer rate to the
air in both combustors is 5,000 kW. The regenerator has an...
A steam power plant operates on a regenerative Rankine cycle. Steam enters the turbine at 6...
A steam power plant operates on a regenerative Rankine cycle.
Steam enters the turbine at 6 MPa at 700 ºC and the condenser at 10
kPa. Turbine has isentropic efficiency of 85% and pumps have
isentropic efficiency of 90%. Steam is extracted from the turbine
at 0.6 MPa to heat the feedwater in an open feedwater heater. Water
leaves the open feedwater heater as saturated liquid.
a) Draw the system with labels and show the ideal and the
non-ideal cycle...
A steam power plant operates on an ideal regenerative Rankine cycle. Steam enters the turbine at...
A steam power plant operates on an ideal regenerative Rankine
cycle. Steam enters the turbine at 6 MPa and 450oC and is condensed
in the condenser at 20 kPa. Steam is extracted from the turbine at
0.4 MPa to heat the feedwater in an open feedwater heater. Water
leaves the feedwater heater as a saturated liquid. Show the cycle
on a T-s diagram and determine the fraction of steam extracted from
the turbine for the open feedwater heater.
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
A power plant operates on a regenerative vapor power cycle with
one open feedwater heater. Steam enters the first turbine stagge at
12 MPa, 560*C and expands to 1 MPa, where some of the steam is
extracted and diverted to the open feedwater heater operating at 1
MPa. The remaining steam expands through the second turbine stage
to the condenser pressure of 6 kPa. Saturated liquid exits the open
feedwater heater at 1 MPa. The net power output for the...
A power plant operates on a regenerative vapor power cycle with one open feedwater heater. Steam...
A power plant operates on a regenerative vapor power cycle with
one open feedwater heater. Steam enters the first
turbine stage at 12 MPa, 520◦C and expands to 1 MPa, where some of
the steam is extracted and diverted to the open
feedwater heater at 1 MPa. The remaining steam expands through the
second turbine stage to the condenser pressure of
6 kPa. Saturated liquid exits the open feedwater heater at 1 MPa.
For isentropic processes in the turbines and...
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