HOW DO YOU CALCULATE POWER GENERATION COST??Power in the steam Turbines produces at every stage where the steam is taken out, whether it may be bleed, extraction or exhaust steam. As the steam out from the turbine increases the power developed on that particular stage will increase.Power generation phenomenon.Power generation in steam Turbines is calculated based on difference between the heat content of inlet steam & extracted steam.📷Factors affecting the power generation:Power generation at particular stage increases, when there is more steam flow &vice versa Power generation at particular stage increases when there is more difference between inlet & extraction steam & Vice versa Power develop at particular stage decreases if its extraction pressure increases & vice versa Power developed at particular stage decreases if its extraction temperature increases & vice versa Power developed in steam Turbine decreases if inlet live steam pressure & temperature decrease If steam vacuum decreases power generation reduces or else Turbine will consume more steam to develop same power If exhaust steam temperature increases then the power power generation reduces or else Turbine will consume more steam to develop same power If wheel chamber pressure increases, then the power generation capacity of the Turbine decreases

In which part of the Turbine higher power can be produced at lower steam consumption? And why?

It is at the exhaust stage. Because at the exhaust stage pressure & temperature of the steam is very lesser than bleed &extraction stages.

In which part of the Turbine lowest power is produced at higher steam consumption? And why?

It is at the bleed stage. Because at bleed steam pressure & temperatures are higher than extraction & exhaust stages

Calculation part:

1-Calculate the power generated in a back pressure steam Turbine, where 50 TPH steam enters the Turbine at 66 kg/cm2 & temperature 485 Deg C.And steam exhausts to process at pressure 2 kg/cm2 & temperature 180 Deg C.

For calculation of power we need to know the enthalpy of inlet & exhaust steam.

Refer steam table

Enthalpy of inlet steam at rated parameters H1 = 806.5 kcal/kg

Enthalpy of inlet steam at rated parameters H2 = 677 kcal/kg

Now power developed in steam turbine P = Q X (H1-H2) / 860

Where Q is steam flow

P = 50 X (806.5-677) / 860

P = 7.52 MW

Note: 860 kcal = 1 KWH

-A Turbine’s inlet steam enthalpy is 825 kcal/kg & Exhaust enthalpy is 590 kcal/kg. Calculate the work done by steam & specific steam steam consumption

We have,

H1 = 825 kcal/kg, H2 = 590 kcal/kg

Work done per kg of steam = (H1-H2) = 825-890 =235 kcal/kg

SSC = 860 / Work done = 860 / 235 =3.65 kg/kwh or 3.65 MT/MW

6-A steam Turbine inlet steam pressure & temperatures are 104 kg/cm2 & 540 C0 & exhausts at pressure 0.09 kg/cm2 & temperature 43 Deg C calculate the

a- Work done per kg of steam

b- Heat supplied per kg of steam

c- Cycle efficiency

Enthalpy of inlet steam = 829 kcal/kg

Exhaust liquid enthalpy = 44 kcal/kg

Exhaust enthalpy by considering 90% dryness fraction = 44 + 0.9 X 616.44 =598.76 kcal/kg

A-Work done per kg of steam = (829-598.76) = 230.24 kcal/kg

B-Heat supplied per kg of steam = 829-44 = 785 kcal/kg

C-Cycle efficiency = Work done per kg of steam X 100 / Heat supplied per kg of steam

= 230.24 X 100 / 785 = 29.32%

Note:

Power developed at Generator terminals = Power developed at Turbine Shaft X Reduction gear box efficiency X Alternator efficiency

For example:

Calculate the net power developed at Generator terminal if 100 TPH steam enters the Turbine at 811 kcal/kg enthalpy & leaves the Turbine at enthalpy 565 kcal/kg .Assume Gear box efficiency as 98% & Generator efficiency as 95%

Power developed on Turbine shaft = 100 X (811-565) / 860 = 28.0 MW

Net power developed at Generator output terminals = 28.0 X 0.98 X 0.95 = 26.06 MW

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