A coal-fired steam power plant operates on the ideal Rankine
cycle. Feedwater from the condenser at P1 = 10 kPa is pumped to the
boiler at P2 = P3 = 20 MPa, where it is superheated and exits the
boiler at T3 = 550 °C.
The moisture content in the turbine is not to exceed 12% (i.e.
steam quality is to be maintained above x = 0.88 throughout the
turbine). Up to two reheat stages can be added to the steam cycle
to satisfy this requirement. If needed, one stage can be added to
reheat the steam to T5 = 525 °C at P4 = P5 = 10 MPa. If more
reheating is required, a second stage can be added to reheat the
steam to T7 = 500 °C at P6 = P7 = 2.5 MPa. (There is a process diagram for single reheat in the attached file.)
a. How many reheat stages are required for this power plant (no
reheat, single reheat, or double reheat)? Provide claculations in support of the answer.
(1) -> pump–>
(2) -> boiler–> (3) -> turbine–> (4)
->boiler–> (5)-> turine–> (6)–> (possible extra
stages) -> condenser> – not so sure if this is the right answer to the question.
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Get Help Now!b. What is the thermal efficiency ? th of the power cycle?
c. Determine the annual emission of sulfur dioxide, mSO2, in
metric tons, from this power plant, if the net generating capacity
of the plant is 600 MW, and the boiler is 88% efficient in
transferring combustion heat into the feedwater superheat and steam
reheat stages. The boiler burns, to completion, a coal that has a
heating value of 22,800 kJ/kg and contains 0.46 wt% sulfur.
Assume that all of the sulfur content of the coal is emitted as
SO2 in the combustion flue gas, and that the coal-burning plant has
a capacity factor of 0.85; i.e. the boiler is operational for 85%
of the hours in one calendar year. (1 metric ton = 1000 kg)
Attachments:
Question-1.pptx
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