Question

Consider a cogeneration power plant that is modified with reheat and that produces 3 MW of power and supplies 7 MW of process heat. 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 pressure of 15 kPa. The condensate from the condenser is pumped to 1 MPa and mixed with the extracted steam, which leaves the process heater as a compressed liquid at 120 C. The mixture is then pumped to the boiler pressure. Assuming the turbine to be isentropic, show the cycle on a T-s diagram with respect to saturation lines, and disregarding pump work, determine (a) The rate of heat input to the boiler and (b) the fraction of steam extracted for process heating. (c) The utilization factor of the plant.

Answer #1

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
passing through high pressure turbine to its original temperature
at a pressure of 1 MPa. Then the steam expanded to condenser
pressure. The condenser pressure is 5 kPa. Show the cycle on a T-s
diagram with respect to saturation lines, and determine; (i) the
thermal efficiency of the cycle; and (ii) the mass...

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...

A steam power plant is designed to operate on a reheat Rankine
cycle to produce 115 MW of a
net power output. Due to metallurgical limitation, the
high-pressure turbine is limited to operate
at maximum pressure and temperature of 15 MPa and 650°C,
respectively. The low-pressure
turbine is to operate at maximum pressure and temperature of 3.5
MPa, and 500°C,
respectively. Both high and low pressure turbines have maximum
isentropic efficiency of 87
percent. The maximum reheat pressure is limited...

QUESTION 5
A steam power plant is designed to operate on a reheat Rankine
cycle to produce 115 MW
of a net power output. Due to metallurgical limitation, the
high-pressure turbine is limited to
operate at maximum pressure and temperature of 15 MPa and 650°C,
respectively. The lowpressure
turbine is to operate at maximum pressure and temperature of 3.5
MPa, and
500°C, respectively. Both high and low pressure turbines have
maximum isentropic
efficiency of 87 percent. The maximum reheat pressure...

A power plant operates on a regenerative vapor power cycle with
one open feedwater heater. Steam enters the first turbine stage 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 17 kPa. Saturated liquid exits the
open feedwater heater at 1 MPa. The net power output for the...

A power plant engineer states that his/her power plant absorbs
100 MW heat from burning coal at 1000 K, produces 60 MW work and
rejects 40 MW heat in a condenser at 300K. The pressure of steam in
the boiler and condenser is 5 MPa and 100 kPa, respectively. Please
calculate the total entropy generated in this case.

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
machines operating at the same pressure ranges.
a) Sketch the cycle on a T-S...

Water is the working fluid in a Rankine cycle with reheat.
Superheated vapor enters the turbine at 10 MPa, 520°C, and the
condenser pressure is 6 kPa. Steam expands through the first-stage
turbine to 0.7 MPa and then is reheated to 520°C. The pump and each
turbine stage have an isentropic efficiency of 70%.
Determine for the cycle:
(a) the heat addition, in kJ per kg of steam entering the
first-stage turbine.
(b) the percent thermal efficiency.
(c) the magnitude...

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

A
steam power plant operates with a high pressure of 4 MPa and has a
boiler exit at 600C recieving heat from 700C reservoir. The ambient
air at 20C provides cooling to maintain the water/vapor mixture in
the condenser at 60C. All components are ideal (reversible) except
the turbine which has an efficientcy 92% of a reversible,
isentropic process. other than that the irreversibility of the
turbine, the power plant can be considered as a Rankine cycle.
Determine the following...

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