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In modern Combined Cycle Power Stations, the exhaust gas from Gas Turbines, which contains significant amount of heat energy is diverted to water boilers to generate steam which in turn runs Steam Turbines. Usually Two or Three GT's exhaust gas is used to run a ST.
The significance of this is that, the otherwise wasted exhaust heat is intelligently used to generate power, thereby pushing the efficiency of a single GT of 25-30 % to a combined cycle efficiency of about 45-50 %.
Alternatively in some industries, the exhaust gas can also be used for process heating requirements.
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What is the difference between a pulse system and a constant pressure turbocharger?
Types of turbochargers Turbochargers are of two types and they are pulse and constant pressure type turbocharger. Pulse type turbocharger: In pulse type turbocharger, the exhaust gas directly enters the turbine side and drives the turbine with the exhaust gas energy. The connection from the exhaust side of an engine is directly connected to the turbine side of a turbo charger. The pipe connections from the exhaust gas towards the turbine side are generally small in length and exhaust grouping is provided to prevent the blowback of gases from one cylinder to another. Constant pressure type turbocharger: In constant pressure type turbocharger, the exhaust gases gets collected in a single exhaust gas reservoir, where the pressure is maintained constant so as to avoid any fluctuation in the exhaust gas energy pressure. The exhaust gas is introduced to the turbine side after maintaining the pressure inside the cylinder. Materials: Turbine and compressor blades: Steel or nickel alloy. Volute casing: cast iron Bearings: steel or gun metal.
How do you effect the gas turbine exhaust pressure loss on performance?
Gas turbine exhaust pressure loss negatively impacts performance by reducing the effective pressure ratio across the turbine. This loss can lead to decreased power output and efficiency, as the turbine has to work harder to achieve the same thrust or energy output. Additionally, higher exhaust pressure can result in increased back pressure, potentially affecting the overall system's thermal efficiency and contributing to higher fuel consumption. Managing exhaust pressure losses through design optimizations and control systems is crucial for enhancing turbine performance.
Why does gas turbine trips on high exhaust tempr spread?
nozzle fouling, restricted cooling, component wear
What is the critical flow area inside the turbine housing of a turbocharger known as?
The critical flow area inside the turbine housing of a turbocharger is known as the "turbine inlet area" or "turbine nozzle area." This area is crucial for optimizing exhaust gas flow into the turbine, influencing the turbocharger's efficiency and response. Proper sizing and design of this area help to maximize the energy extracted from the exhaust gases, ultimately enhancing the performance of the engine.
Open cycle arrangement of a gas turbine?
1. The working gas is compressed in compressor and directed towards the heat exchanger (Air heater), where heat is being added to the compressed gas before it enters the turbine. 2. The heat is supplied by an external source such as a nuclear reactor, or some other heat source. 3. The hot gasses then expend and accelerate through a nozzle which drive the guide vanes of the turbine and then shaft. 4. At last, the remaining exhaust gasses pass through a cooler and directed towards the compressor inlet.
What property of the exhaust gas is being used to turn the turbine that runs the compressor?
At exhaust valve opening, pressurised gas reduces pressure by moving across the turbine blades and out of the exhaust pipe, the momentum of the moving gas is tapped by the turbine blades producing torque on the turbine shaft.
What is the difference between a pulse system and a constant pressure turbocharger?
Types of turbochargers Turbochargers are of two types and they are pulse and constant pressure type turbocharger. Pulse type turbocharger: In pulse type turbocharger, the exhaust gas directly enters the turbine side and drives the turbine with the exhaust gas energy. The connection from the exhaust side of an engine is directly connected to the turbine side of a turbo charger. The pipe connections from the exhaust gas towards the turbine side are generally small in length and exhaust grouping is provided to prevent the blowback of gases from one cylinder to another. Constant pressure type turbocharger: In constant pressure type turbocharger, the exhaust gases gets collected in a single exhaust gas reservoir, where the pressure is maintained constant so as to avoid any fluctuation in the exhaust gas energy pressure. The exhaust gas is introduced to the turbine side after maintaining the pressure inside the cylinder. Materials: Turbine and compressor blades: Steel or nickel alloy. Volute casing: cast iron Bearings: steel or gun metal.
What is the average gas turbine exhaust temperature?
The average gas turbine exhaust temperature typically ranges from 900 to 1,200 degrees Fahrenheit (approximately 480 to 650 degrees Celsius). This temperature can vary based on factors such as the design of the turbine, its operating conditions, and the type of fuel used. Higher efficiency turbines may achieve lower exhaust temperatures due to improved thermal performance.
How do you effect the gas turbine exhaust pressure loss on performance?
Gas turbine exhaust pressure loss negatively impacts performance by reducing the effective pressure ratio across the turbine. This loss can lead to decreased power output and efficiency, as the turbine has to work harder to achieve the same thrust or energy output. Additionally, higher exhaust pressure can result in increased back pressure, potentially affecting the overall system's thermal efficiency and contributing to higher fuel consumption. Managing exhaust pressure losses through design optimizations and control systems is crucial for enhancing turbine performance.
What gas is used to turbo the cars?
Turbo chargers are driven by the exhaust gases exiting the engine - engine exhaust drives a turbine in the exhaust system which, in turn, turn the turbo compressor.
Why does gas turbine trips on high exhaust tempr spread?
nozzle fouling, restricted cooling, component wear
Why Gas Turbine Exhaust temperature is above 500 deg C?
The exhaust temperature of gas turbines is very high due to the large amount of energy input into the inlet air by the combustion of fuel in the combustion chamber.
Definition of open cycle gas turbine?
An open cycle gas turbine (OCGT) is a type of gas turbine that converts fuel energy into mechanical energy through a continuous process. In this system, air is drawn in, compressed, mixed with fuel, and combusted, generating high-temperature exhaust gases that drive a turbine. The exhaust gases are then released into the atmosphere, making the cycle "open." OCGTs are often used for peaking power plants due to their quick startup times and ability to meet fluctuating energy demands.
What is the critical flow area inside the turbine housing of a turbocharger known as?
The critical flow area inside the turbine housing of a turbocharger is known as the "turbine inlet area" or "turbine nozzle area." This area is crucial for optimizing exhaust gas flow into the turbine, influencing the turbocharger's efficiency and response. Proper sizing and design of this area help to maximize the energy extracted from the exhaust gases, ultimately enhancing the performance of the engine.
Gas turbine generator?
gas turbine generator
What is pulse turbo charger?
Pulse turbocharger uses pressure pulse wave to expand the gas further at turbine nozzles and blades. Exhaust gases from each cylinder is is directly lead to turbine inlet.
What is open and closed cycle gas turbine?
In an open cycle gas turbine, the gases that are produced by combustion go directly into the atmosphere, though the heat produced can sometimes be reclaimed. In a closed cycle gas turbine, the gases produced are reused and are not emitted into the atmosphere.
