Question
In: Mechanical Engineering
Taichung thermal power station wants to change their steam generator with a new steam generator that...
Taichung thermal power station wants to change their steam generator with a new steam generator that has a better efficiency. The existing steam generator operating with Rankine cycle with reheat and has a thermal efficiency of 30%. Taichung thermal power station has been offered by Patron Company that supplies new steam generators that are more environmentally friendly. The specifications of the new steam generator are as follow:
- maximum pressure is 15MPa,
- minimum pressure is 10kPa
- Temperature entering the turbine is 500°C.
- Isentropic efficiency of the pump is 85%
Taichung thermal power station wants the new steam generator to have vapor content of the steam to exceed 90% and the steam mass flow rate is 12kg/s. Evaluate:
i. the pressure at which the reheat cycles takes place
(12 marks, C5)
ii. the total rate of heat in the boiler
(4 marks, C5)
iii.
Does the new steam
generator have higher thermal efficiency of the cycle
than the current generator? Justify your answer.
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samet mamat answered 7 months agoRelated Solutions
Taichung thermal power station wants to change their steam generator with a new steam generator that...
Taichung thermal power station wants to change their steam
generator with a new steam generator that has a better efficiency.
The existing steam generator operating with Rankine cycle with
reheat and has a thermal efficiency of 30%. Taichung thermal power
station has been offered by Patron Company that supplies new steam
generators that are more environmentally friendly. The
specifications of the new steam generator are as follow: maximum
pressure is 15MPa, minimum pressure is 10kPa Temperature entering
the turbine is...
A steam generator is needed in the design of new mini-power plant. This generator can be...
A steam generator is needed in the design of new mini-power
plant. This generator can
be purchased with two different specification proposals, A or B.
Proposal A has life
of 15 years, a first cost of RM45,000 to buy with estimated an
annual saving of
RM3,500 per year and estimated for an annual operating &
maintenance cost of RM750
per year. A salvage value of RM10,700 and one-off overhaul in year
9 that cost RM
1,500. Proposal B has a...
Superheated steam at 8 MPa and 480°C leaves the steam generator of a vapor power plant....
Superheated steam at 8 MPa and 480°C leaves the steam generator
of a vapor power plant. Heat transfer and frictional effects in the
line connecting the steam generator and the turbine reduce the
pressure and temperature at the turbine inlet to 7.7 MPa and 440°C,
respectively. The pressure at the exit of the turbine is 10 kPa,
and the turbine operates adiabatically. Liquid leaves the condenser
at 8 kPa, 36°C. The pressure is increased to 8.6 MPa across the
pump....
Superheated steam at 8 MPa and 480°C leaves the steam generator of a vapor power plant....
Superheated steam at 8 MPa and 480°C leaves the steam generator
of a vapor power plant. Heat transfer and frictional effects in the
line connecting the steam generator and the turbine reduce the
pressure and temperature at the turbine inlet to 7.3 MPa and 440°C,
respectively. The pressure at the exit of the turbine is 10 kPa,
and the turbine operates adiabatically. Liquid leaves the condenser
at 8 kPa, 36°C. The pressure is increased to 8.6 MPa across the
pump....
a.) What is the thermal efficiency of a steam power plant operating on the Rankine cycle...
a.) What is the thermal efficiency of a steam power plant
operating on the Rankine cycle if saturated steam is supplied to
the turbine at 1000 psia, and the condenser is at 1 psia. Use a
turbine efficiency of 95% and a pump efficiency of 85%. Refer to
Chapter 9, Sections 10-11, as necessary.
b.) Determine the thermal efficiency if the steam is superheated to
1000 F, assuming all else equal.
Design a steam power cycle that can achieve a cycle thermal efficiency of at least 40%...
Design a steam power cycle that can achieve a cycle thermal
efficiency of at least 40% under the conditions that all turbines
have isentropic efficiencies of 80% and all pumps have isentropic
efficiencies of 65%. Prepare an engineering report describing your
design. Your design report must include, but is not limited to, the
following:
1. Discussion of various cycles attempted to meet the goal as
well as the positive and negative aspects of your design.
2. System figures and T-s...
6. A 600-MW steam power plant, which is cooled by a nearby river, has a thermal...
6.
A 600-MW steam power plant, which is cooled by a nearby river, has
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transfer to the river water.
A 400-MW steam power plant, which is cooled by a nearby river, has a thermal efficiency...
A 400-MW steam power plant, which is cooled by a nearby river,
has a thermal efficiency of 33 percent. (i) Sketch an appropriate
illustration for this heat engine clearly showing the heat source
and sink. (ii) Determine the rate of heat transfer to the river
water. (iii) Will the actual heat transfer rate be higher or lower
than this value? Why?
For an electrical power plant of your choice: (a) How would the thermal efficiency change if...
For an electrical
power plant of your choice:
(a) How would the
thermal efficiency change if T-Low were decreased by one degree
while keeping T-High constant? Assume Carnot cycle.
(b) How would the
change in the thermal efficiency (resulting from the lower T-Low)
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The following data collected from a steam turbine of 25 MW capacity thermal power plant: Assume...
The following data collected from a steam turbine of 25 MW
capacity thermal power plant:
Assume R for air as 287 kJ/kg C
Steam condensed = 40000 kh/hr
Temperaure of steam in condenser =40 degree
Dryness of steam enetring condenser = 0.85
Air leakage in the condenser = 140 kg/hr
Temperature of codenser =35 degree
Temperature at the suction of air pump = 32 degree
Borometer reading = 76 cm of Hg
Maximum rise in cooling water temperature =12 degree...
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