Question

A steam power plant runs on a reheat Rankine cycle. Steam enters both the high and low pressure turbines at 500oC. The maximum and minimum pressures of the cycle are 10 MPa and 10 kPa, respectively. Steam leaves the condenser as a saturated liquid. The moisture content of the steam at the exit of the low-pressure turbine is 4% if the actual expansion process is adiabatic; 8.5% if the ideal expansion process is isentropic. The isentropic efficiencies of the high-pressure turbine and compressor are both at 89%

a) Calculate the operating pressure (MPa) of the low-pressure turbine.

b) What is the minimum mass flowrate of steam (kg/s) if at least 20 MW of power is generated?

Answer #1

Consider a 210-MW steam power plant that operates on a simple
ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500°C
and is cooled in the condenser at a pressure of 7.5 kPa.
a.)Determine the quality of the steam at the turbine exit. Use
steam tables.
b.)Determine the thermal efficiency of the cycle.
c.)Determine the mass flow rate of the steam

Consider a 210-MW steam power plant that operates on a simple
ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500°C
and is cooled in the condenser at a pressure of 7.5 kPa. Determine
the quality of the steam at the turbine exit. Use steam tables.
(You must provide an answer before moving on to the next part.)
a.)The quality of the steam at the turbine exit is?
b.)Determine the thermal efficiency of the cycle.The thermal
efficiency of...

Consider a cogeneration power plant that is modified with reheat
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Steam enters the high pressure turbine at 8 MPa and 500 C and
expands to a pressure of 1 MPa. At this pressure, part of the steam
is extracted from the turbine and routed to the process heater,
while the remainder is reheated to 500 C and expanded in the low
pressure turbine to the condenser...

A power plant operates on a regenerative vapor power cycle with
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MPa. The remaining steam expands through the second turbine stage
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Determine for the cycle:
(a) the heat addition, in kJ per kg of steam entering the
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(b) the percent thermal efficiency.
(c) the magnitude...

Consider a power plant operating on a Rankine cycle
using steam as the
working fluid. The boiler pressure is 2.8 MPa and the steam leaving
the boiler is
superheated to a temperature 110 0C above its saturation
temperature. The condenser
temperature is 49 0C. Condenser discharges saturates liquid. The
efficiency of the
turbine is 0.90 and of the pump 0.8 as compared to reversible and
adiabatic
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a) Sketch the cycle on a T-S...

In a steam plant operating according to an ideal Rankine cycle,
water vapor enters the turbine at 3.0 MPa pressure and 600 oC
temperature and exits the turbine with 100 kPa and 0.8 degree of
dryness. Heat is thrown from the condenser to the surrounding
environment and the water is provided to be saturated liquid at 100
kPa. In this case, what is the amount of heat from the Condenser to
the surrounding environment for the unit mass?
be quıck

In a steam plant operating according to an ideal Rankine cycle, water vapor enters the turbine at 3.0 MPa pressure and 600 oC temperature and exits the turbine with 100 kPa and 0.8 degree of dryness. Heat is thrown from the condenser to the surrounding environment and the water is provided to be saturated liquid at 100 kPa. So what is the net turbine job for the unit mass?
be quıck

In a steam power plant which has a net power output of 45 MW,
steam is supplied at 10 MPa and 500°C. The steam is reheated after
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pressure. The condenser pressure is 5 kPa. Show the cycle on a T-s
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thermal efficiency of the cycle; and (ii) the mass...

Steam enters an adiabatic turbine at 7 MPa, 700 °C and
80 m/s and leaves at 50 kPa, 150 °C, and 140 m/s. If the power
output of the turbine is 6 MW, determine:
i) Mass
flowrate of the steam flowing through the
turbine.
ii) The
isentropic efficiency of the turbine.

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