Chapter-6 (Gas Turbine & Combined Cycles): The Ideal Brayton Cycle, Example (1), The Actual Simple Gas Turbine Cycle, Example (2), Splitting the Turbine, Example (3), Modification to the basic cycle: Intercooling, Reheat, Heat-Recovery Exchanger, Example (4), Combined Cycles with Heat-Recovery Boilers, Example (5), Tutorial Sheet-6.

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  –  

  

   

CHAPTER (6)

Gas Turbines & Combined Cycles

..    .

10‐ Feb‐ 15

Chapter6

GasTurbine&CombinedCycles

The Ideal Brayton Cycle, Example (1), The Actual Simple Gas Turbine Cycle,

Example (2), Splitting the Turbine, Example (3), Modification to the basic cycle:

Intercooling, Reheat, Heat-Recovery Exchanger, Example (4), Combined Cycles

with Heat-Recovery Boilers, Example (5), Tutorial Sheet 6.

Power Plant Engineering TUTORIAL SHEET‐6   –  

Gas Turbine& Combined Cycles     –   

119

Assume the following:

For compression process:‐   1.005 

.,  1.4

For combustion and expansion processes:‐   1.15 

.,  1.333

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐

1‐ Agasturbineunithasanoverallpressureratioof(5/1)andamaximumcycle

temperatureof(550Co ).Theturbinedrivesthecompressorandanelectricgenerator.

Themechanicalefficiencyofthedriveis(97%).Theambienttemperatureis(20Co )and

theisentropicefficienciesofthecompressorandturbineare(80and83%)respectively.

Calculatethe poweroutput inkilowatt forairflow of(15 kg/s).Also, calculatethe

thermal efficiency and the work ratio. Neglect changes in kinetic energy and the

pressurelossesinthecombustionchamber.

2‐ Inamarinegasturbineunit,aHigh‐pressureturbinestagedri vesthecompressor,and

alow‐pressureturbinestagedrivesthepropellerthroughsuitablegearing.Theoverall

pressureratiois(4/1),andthemaximumtemperatureis(650C o).Theisentropic

efficienciesofthecompressor,HPandLPturbinesare(80,83and85%)respectively,

andthemechanicalefficiencyofbothshaftsis(98%).Calculatethepressurebetween

turbinestageswhentheairintakeconditionare(1.01barand 25Co ).Also,calculatethe

thermalefficiencyandtheshaftpowerwhenthemassflowis(60kg/s).Neglectchanges

inkineticenergyandthepressurelossesinthecombustionchamber.

3‐ A combined power plant consisting of a simple open cycle gas turbine unit, using air as the

working fluid (neglect fuel mass flow rate), and a steam turbine is to be designed such that

the heat rejected at the gas turbine unit is to be utilized to produce steam at the generator

for the steam turbine. The exhaust air leaving the generator is at (200 Co ). Draw a simple

sketch for the plant and the (T‐ s) diagram and calculate the mass flow rate of steam per

(kg/s) of airflow, the total power output per (kg/s) of airflow and the overall thermal

efficiency of the plant. Assume ideal cycles. Neglect the feed pump work of Rankinecycle.

Thedataofeachcycleareasfollows:‐

GasTurbineCycle SteamTurbineCycle

Pressure

(bar) Minimum 1 0.07

Maximum 5 30

Temperature

(Co ) Minimum 20

Maximum 830 300

... The Gas Engine used in the Tanjung Jabung 3x10 MW Gas Power Plant, on the proposal, is Siemens SGT400 with a capacity of up to 13 MW [6,7]. Gas Engine Siemens SGT-400 is a gas turbine that has a relatively small size so it is easy to move and can be made based on the fuel to be used. ...

... In this paper, it is assumed that the power plant as an ideal condition, due to the impossibility to gain the data because the power plant is not existed yet. It is being analyzed and estimated how the power plant would work when the power plant has been built and operated by following the parameters shown on both the proposal and the technical specification of the Siemens SGT-400 [6,7] on the brochures which are: • Site Condition ...

... The Tanjung Jabung Gas Power Plant 3x10 MW is powered by three Siemens SGT-400 turbines [3] which each of them can operate up to 13 MW [6,7] each at peak load. Shown in Fig. 1, The fuel gas supply is 81% methane comes from the site location based on the proposal [3] which would get filtered by two tubes of Gas Scrubbers who are filtering the solid residues and two Gas Filters who are filtering in further detail before getting heated by two Gas Heaters to increase the pressure, two Gas Reducing Pressure Units work to control the amount of pressure getting to the turbines. ...

  • Muhammad Arif Budiyanto
  • Adrian Ova Triandi
  • Ova Kurniawan Ova Kurniawan

The use of electricity continues to increase every year, which then requires increasing the number of power plants to meet the demand for total electricity usage in the community. Jambi Province has a wealth of natural resources in the form of natural gas, which is quite abundant, making the Gas Power Plant has a very good prospect to fulfill the electricity supply in Jambi. In the written proposal, the power plant is planned to use Siemens SGT-400 as its Turbine Generator, which will be the first to be applied in Indonesia, is believed to be at the heart of this Gas Engine Power Plant Development Plan. In this paper, the Siemens SGT-400 Gas Engine that uses the Brayton cycle is analyzed based on the specifications stated in the proposal and brochure was calculated to find out how the whole system will run in ideal conditions. Inclusion of charts, schematic diagrams, and design layouts will strengthen the analysis performed. The Siemens SGT-400 is concluded that it has a cycle that corresponds to the Brayton Cycle theory which isentropic line is slightly different from theory and has an efficiency of 37%.

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