The Effects of Two Shaft Gas Turbine Operating Conditions on the Overall Performance

Topics: Gas turbine, Jet engine, Turbine Pages: 20 (4850 words) Published: April 7, 2013
The Effects of Two Shaft Gas Turbine Operating Conditions on the Overall Performance Rehab Noor Mohammed Babylon University / College of Engineering / Mechanical Department Ali Meer Ali Jasim Babylon University / College of Engineering / Mechanical Department Dr. Ahmed Khadem Babylon University / College of Engineering / Mechanical Department

ABSTRACT: In this research, we study the effect of the some parameters (gas turbine speed, power turbine speed, mass flow rate of air, mass flow rate of fuel, compression ratio, air to fuel ratio and inlet compressor temperature) on the overall system efficiency, alternator efficiency and the overall heat efficiency of the two shaft gas turbine system, the working fluid was propane. Firstly we checked the experimental results by plotted the (T-S diagram) between the experimental and analytical solution and then we study the effect of the above parameters on the overall system efficiencies. Also we checked the effect of the inlet compressor temperature on the overall gas turbine performance .From these results, we can notes the increasing of the compression ratio and the power turbine speed will increase the overall efficiency, overall heat efficiency and decreasing the alternator efficiency, at the same time is increase the gas turbine efficiency. Keyword: Gas Turbine, Power Turbine, Inlet Temperature, Compressor, Experimental

‫ﺘﺄﺜﻴﺭﺍﺕ ﻅﺭﻭﻑ ﺍﻟﺘﺸﻐﻴل ﻋﻠﻰ ﺍﻻﺩﺍﺀ ﺍﻟﺤﺭﺍﺭﻱ ﻟﻤﻨﻅﻭﻤﺔ ﺍﻟﺘﻭﺭﺒﻴﻥ ﺍﻟﻐﺎﺯﻱ ﺫﺍﺕ ﺍﻟﻌﻤﻭﺩﻴﻥ‬ ‫د. اﺣﻤﺪ آﺎﻇﻢ‬ ‫ﺟﺎﻣﻌﺔ ﺑﺎﺑﻞ - آﻠﻴﺔ اﻟﻬﻨﺪﺳﺔ – ﻗﺴﻢ‬ ‫اﻟﻬﻨﺪﺳﺔ اﻟﻤﻴﻜﺎﻧﻴﻜﻴﺔ‬ ‫ﻋﻠﻲ ﻣﻴﺮ ﻋﻠﻲ ﺟﺎﺳﻢ‬ ‫ﺟﺎﻣﻌﺔ ﺑﺎﺑﻞ - آﻠﻴﺔ اﻟﻬﻨﺪﺳﺔ – ﻗﺴﻢ‬ ‫اﻟﻬﻨﺪﺳﺔ اﻟﻤﻴﻜﺎﻧﻴﻜﻴﺔ‬ ‫رﺣﺎب ﻧﻮر ﻣﺤﻤﺪ‬ ‫ﺟﺎﻣﻌﺔ ﺑﺎﺑﻞ - آﻠﻴﺔ اﻟﻬﻨﺪﺳﺔ – ﻗﺴﻢ‬ ‫اﻟﻬﻨﺪﺳﺔ اﻟﻤﻴﻜﺎﻧﻴﻜﻴﺔ‬

:‫اﻟﻤﻠﺨﺺ‬ ، ‫ﺧﻼل اﻟﺒﺤﺚ اﻟﺤﺎﻟﻲ ﺗﻢ دراﺳﺔ ﺗﺄﺛﻴﺮ ﺑﻌْﺾ اﻟﻤﺘﻐﻴﺮات ﻣﺜﻞ )ﺳﺮﻋﺔ دوران اﻟﺘﻮرﺑﻴﻦ اﻟﻐﺎزي ، ﺳﺮﻋﺔ دوران ﺗﻮرﺑﻴﻦ اﻟﻘﺪرة‬ َ ِ ‫ﻣﻌﺪل ﺟﺮﻳﺎن اﻟﻬﻮاء و ﻣﻌﺪل ﺟﺮﻳﺎن اﻟﻮﻗﻮد ، ﻧﺴﺒﺔ اﻻﻧﻀﻐﺎط وﻧﺴﺒﺔ آﻤﻴﺔ اﻟﻮﻗﻮد إﻟﻰ اﻟﻬﻮاء ودرﺟﺔ ﺣﺮارة اﻟﻬﻮاء اﻟﺪاﺧﻞ اﻟﻰ اﻟﻀﺎﻏﻂ‬ ِ ‫ﱢ‬ ‫(( ﻋﻠﻰ اﻟﻜﻔﺎءة اﻟﻌﺎﻣﺔ ﻟﻠﻤﻨﻈﻮﻣﺔ اﻟﻐﺎزﻳﺔ، اﻟﻜﻔﺎءة اﻟﺤﺮارﻳﺔ ﻟﻠﻤﻨﻈﻮ ِﺔ وآﻔﺎءة اﻟﻤﻮﻟﺪ اﻟﻜﻬﺮﺑﺎﺋﻲ اﻟﺘﻲ ﺗﺴﺘﻌﻤﻞ اﻟﺒﺮوﺑﺎن‬Compressor) ً ‫ﻣ‬ ِ ‫ ( اﻟﻨﻈﺮي واﻟﺘﺤﻠﻴﻠﻲ وﺑﻌﺪ ذﻟﻚ ﺗﻢ دراﺳﺔ‬T-S )‫آﻮﻗﻮد ، أوﻻ ﺗﻢ أﺟﺮاء ﻣﻘﺎرﻧﺔ ﺑﻴﻦ اﻟﻨﺘﺎﺋﺞ اﻟﻤﺨﺘﺒﺮﻳﺔ ﺑﺎﻻﻋﺘﻤﺎد ﻋﻠﻰ رﺳﻢ ﻣﺨﻄﻂ اﻟـ‬ ِ ً ِ ‫ﺣﺴﺎب ﺗﺄﺛﻴﺮ اﻟﻤﺘﻐﻴﺮات ﻋﻠﻰ اﻷداء اﻟﻌﺎم ﻟﻠﻤﻨﻈﻮ ِﺔ اﻟﻐﺎزﻳﺔ. اﻳﻀﺎ ﺗﺎﺛﻴﺮ درﺟﺔ ﺣﺮارة اﻟﻬﻮاء اﻟﺪاﺧﻞ ﻟﻠﻀﺎﻏﻂ ﻋﻠﻰ ﻓﺎﻋﻠﻴﺔ اﻟﻤﻨﻈﻮﻣﺔ ﺗﻢ‬ ‫ﻣ‬ ‫ِ ﱢ‬ ‫دراﺳﺘﻬﺎ. ﻣﻦ هﺬﻩ اﻟ َﺘﺎﺋﺞ ﻳﻤﻜﻦ أن ُﻼﺣﻆ زﻳﺎدة ﻧﺴﺒﺔ اﻻﻧﻀﻐﺎط وﺳﺮﻋﺔ دوران اﻟﺘﻮرﺑﻴﻦ اﻟﻐﺎزي ﻳﺆدي إﻟﻰ زﻳﺎدة اﻟﻜﻔﺎءة اﻟﻌﺎ ﱢﺔ‬ ‫ﻣ‬ َ َْ َ َ ‫ﻨ ِ ِ ُِْ ُ َ ْ ﻧ‬ ِْ ‫ﻟﻠﻤﻨﻈﻮ ِﺔ اﻟﻐﺎزﻳﺔ و اﻟﻜﻔﺎءة اﻟﺤﺮارﻳﺔ ﻟﻠﻤﻨﻈﻮ ِﺔ وﺗﻘﻠﻴﻞ آﻔﺎءة اﻟﻤﻮﻟﺪ اﻟﻜﻬﺮﺑﺎﺋﻲ وﻓﻲ ﻧﻔﺲ اﻟﻮﻗﺖ ﻳﺆدي إﻟﻰ زﻳﺎ َة ﺳﺮﻋﺔ دوران ﺗﻮرﺑﻴﻦ‬ ‫َ ْد‬ ‫ﻣ‬ ‫ﻣ‬ .‫اﻟﻘﺪرة‬ 1

Cp R Cv ρ1 ∆h ftb Q1 S p γ ρ Constant pressure mass heat capacity (kJ/kg.K) Gas universal constant (kJ/kg.K) Constant volume mass heat capacity (KJ/Kg.K) Air mass density in the measured upstream of the diaphragm (kg/m3) Differential alcohol manometer reading subscript (mm) Flowmeter correction factor for the feed pressure value of the used fuel The heat power supplied to the fuel in the heater (kW) Entropy (kJ/K) Pressure (pa) Isentropic index Density (Kg/m3) Air Maximum value Stoichiometric Fuel in bottle System turbine Alternator Gas turbine HCV T t I V N m rc Heat calorific value (kJ/kg) Temperature (K) Temperature (°C) Current (A) Voltage (V) Velocity (rpm) Mass flow rate (kg/s) Compression ratio

η Efficiency

a max st fb s,TP alt gt f min h s Overall id opt pt Fuel Minimum value Heater System System overall Ideal Organic Power turbine Average

Superscript ′
Exhaust gases


INTRODUCTION Power generation is an important issue today, The gas turbine unit is extensive use for electrical power generation, the gas turbine may be operated by the remote control and need little or no attendance while operating and no attendance when shutdown, [1]. Brayton cycle is the backbone of power generation, and then we must have deepened knowledge of how the Brayton cycle is applied at power...
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