Combustion air compressor T1-298 K P1 = 100 kPa Air inlet fuel Gas Output into the Atmosphere Superheater www Recovery boiler evaporator 10 turbine Thermal process (cogeneration) 17 11 13 12 condenser surface regenerator www www Saver 15 16 5 Gas outlet tertiary air turbine axis pump 14 Expansion Valve SGT-750 core engine with a free high-speed power turbine Simple cycle power generation Mechanical drive applications 41 MW version 41.0 MW 34 MW version 34.0 MW Natural gas, dual fuel, liquid fuel; options available for other gases within specification Power output Fuel Frequency 39.8 MW(e) 50/60 Hz Gross efficiency 40.3% Heat rate Turbine speed Pressure ratio Exhaust mass flow Exhaust temperature NO, emissions Maintenance interval (TBO) 8,922 kJ/kWh 6,100 rpm 24.3:1 115.4 kg/s 468°C (875°F) <9 ppmvd Combined cycle power generation Siemens combined SCC-750 1×1 SCC-750 2×1 cycle power plant Net power output Net plant efficiency Net heat rate 51.55 MW(e) 53.25% 103.74 MW(e) 53.58% 6,760 kJ/kWh 6,718 kJ/kWh Number of gas turbines 2 41.6% 8,661 kJ/kWh 40.4% 8,912 kJ/kWh 3,050-6,100-6,405 rpm 24.3:1 21.9:1 115.4 kg/s 452°C (845°F) <9 ppmvd 34 КОН/68 КОН 107.5 kg/s 439°C (821°F) <9 ppmvd 45 KOH/90 KOH

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Problem 1.1MA
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➢ Based on the study of Thermal Engines, analyze the following problem regarding a gas turbine:
 
a) Siemens gas turbine (information in the attached data sheet of the Siemens STG-750 Turbine);
 
b) The products of combustion pass through the recovery boiler generate superheated steam that feeds a steam turbine (P10 = 8MPa and T10 = 300°C). The flue gas flow rate and the temperature of the gases at the inlet of the recovery boiler is defined in the data sheet of the gas turbine (Siemens STG-750 Turbine).
 
c) The flow rate of superheated steam produced in the recovery boiler shall be defined.
 
d) The flue gas temperature at the outlet of the recovery boiler shall not be lower than 230 °C. 
 
e) The steam turbine is a back-pressure turbine (choose the pressure at the turbine outlet – point 12);
 
f) 15% of the steam is extracted from the turbine at an intermediate pressure (P=1.5MPa) 
 
g) The steam from the turbine outlet and the steam that has passed through the regenerator feed a cogeneration process that requires thermal energy. After supplying the process energetically, the steam leaves the cogeneration system as wet steam with a 40% titer
 
h) As the steam that has left the cogeneration system still contains a steam phase, it will be necessary to carry out condensation before it is pumped through the surface regenerator.
 
i) Assume that the isentropic efficiencies of the compressor and the turbine of the Gas Turbine are equal to 85% and 90% respectively.
 
(j) Assume that the isentropic efficiency of the steam turbine is equal to 90%. Treat the pump as being isentropic. 
 
k) In the analysis is used natural gas
 
➢ Based on the data above, analyze:
 
1) Determine the percentage value of the power that the compressor requires in relation to the power that the turbine (component of the gas turbine) produces;
 
2) What is the fuel consumption in the gas turbine?
 
3) What thermal energy is available in the cogeneration system?
 
4) What is the mechanical power produced by the sum of the two heat engines?
 
5) What is the efficiency of the cycle with cogeneration? 
 
***The data regarding the turbine used and the system analyzed are in the attached image
Combustion air
compressor
T1-298 K
P1 = 100 kPa
Air inlet
fuel
Gas Output into the
Atmosphere
Superheater
www
Recovery
boiler
evaporator
10
turbine
Thermal process
(cogeneration)
17
11
13
12
condenser
surface
regenerator
www
www
Saver
15
16
5 Gas outlet
tertiary air
turbine
axis
pump
14
Expansion Valve
SGT-750 core engine with a free high-speed power
turbine
Simple cycle power generation
Mechanical drive applications
41 MW version
41.0 MW
34 MW version
34.0 MW
Natural gas, dual fuel, liquid fuel; options available for other gases within specification
Power output
Fuel
Frequency
39.8 MW(e)
50/60 Hz
Gross efficiency
40.3%
Heat rate
Turbine speed
Pressure ratio
Exhaust mass flow
Exhaust temperature
NO, emissions
Maintenance interval (TBO)
8,922 kJ/kWh
6,100 rpm
24.3:1
115.4 kg/s
468°C (875°F)
<9 ppmvd
Combined cycle power generation
Siemens combined
SCC-750 1×1
SCC-750 2×1
cycle power plant
Net power output
Net plant efficiency
Net heat rate
51.55 MW(e)
53.25%
103.74 MW(e)
53.58%
6,760 kJ/kWh
6,718 kJ/kWh
Number of gas turbines
2
41.6%
8,661 kJ/kWh
40.4%
8,912 kJ/kWh
3,050-6,100-6,405 rpm
24.3:1
21.9:1
115.4 kg/s
452°C (845°F)
<9 ppmvd
34 КОН/68 КОН
107.5 kg/s
439°C (821°F)
<9 ppmvd
45 KOH/90 KOH
Transcribed Image Text:Combustion air compressor T1-298 K P1 = 100 kPa Air inlet fuel Gas Output into the Atmosphere Superheater www Recovery boiler evaporator 10 turbine Thermal process (cogeneration) 17 11 13 12 condenser surface regenerator www www Saver 15 16 5 Gas outlet tertiary air turbine axis pump 14 Expansion Valve SGT-750 core engine with a free high-speed power turbine Simple cycle power generation Mechanical drive applications 41 MW version 41.0 MW 34 MW version 34.0 MW Natural gas, dual fuel, liquid fuel; options available for other gases within specification Power output Fuel Frequency 39.8 MW(e) 50/60 Hz Gross efficiency 40.3% Heat rate Turbine speed Pressure ratio Exhaust mass flow Exhaust temperature NO, emissions Maintenance interval (TBO) 8,922 kJ/kWh 6,100 rpm 24.3:1 115.4 kg/s 468°C (875°F) <9 ppmvd Combined cycle power generation Siemens combined SCC-750 1×1 SCC-750 2×1 cycle power plant Net power output Net plant efficiency Net heat rate 51.55 MW(e) 53.25% 103.74 MW(e) 53.58% 6,760 kJ/kWh 6,718 kJ/kWh Number of gas turbines 2 41.6% 8,661 kJ/kWh 40.4% 8,912 kJ/kWh 3,050-6,100-6,405 rpm 24.3:1 21.9:1 115.4 kg/s 452°C (845°F) <9 ppmvd 34 КОН/68 КОН 107.5 kg/s 439°C (821°F) <9 ppmvd 45 KOH/90 KOH
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