I have performed plant performance evalutation composing different steam turbine manufacturer. the effect of steam turbine performance also effect to other package on cycle such ash cooling water, drafting system and pumping system your reccomendations are valueable for me to improve my skill.

1. Evaluation of Operation Cost for New Co-
Generation Power Plant from Different Steam
Turbine Manufactures using GE Gate Cycle
Pichai Chaibamrung
Email: ty_giuly@hotmail.com
Linkedin: pichai chaibamrung

2. Objective
• To evaluate operation cost of power plant from
different steam turbine manufacturer

3. Cogeneration plant boundary
• Have to supply process steam at same condition
for all steam turbine manufacturer except
process steam to deaerator with depend on feed
water configuration
• Have to operate at same pressure for deaerator
• Demand electricity is considered just outside
power plant scope and has to be same value

4. Considered Parameter
• The isentropic efficiency does not mean the
better plant heat rate. The another is plant
configuration. The configuration of feed water
heater is the main parameter or key that govern
the overall plant efficiency or heat rate.
• To evaluate the steam turbine efficiency, it is not
only turbine efficiency itself but also the effect of
other equipment in plant such as boiler, cooling
tower, ect.

5. Equipment affected by turbine efficiency
Generating the same output of electricity and process
steam, the different turbine efficiency result in different
power consumption in other machine in the plant. The
main machine effected by this different are:
– Cooling water pump power consumption
– Boiler feed water pump power consumption
– Drafting system power consumption
– Fuel feeding system power consumption

6. Evaluation Method
• Turbine manufacture supply heat and mass balance diagram base
on their design
• Using commercial heat and mass balanced software model
complete cycle for each vendors
• Specify same boundary condition and initial value (boiler eff., inlet
cooling water temp.,deareator pressure, pump eff., pump diff
pressure)
• Run the model to compare the heat rate or plant efficiency
• Check the result of initial value, if it is significantly different, the
efficiency of boiler and pump shall be considered to be different
• The main different result is boiler operating load. This result in the
different boiler feed water pump load, condensate pump load, forced
draft fan load, induced draft fan load and fuel conveying system
load.

7. Example Manufacturer 1
Different ST Eff.
Same process Same cooling
steam condition water inlet temp
Different LP
configuration
Same deaerator pressure
and BFWP eff.

8. Example Manufacturer 2
Different ST eff.
Same process
steam condition
Same cooling
water inlet temp.
Different LP
configuration
Same deaerator pressure and
BFWP eff.

9. Example