Gas Turbine Power Plant Mr.B.Ramesh, M.E.,(Ph.D)
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1 Gas Turbine Power Plant By Mr.B.Ramesh, M.E.,(Ph.D) Research Scholar, CEG, Anna University, Chennai. Associate Professor of Mechanical Engineering, St. Joseph s College of Engineering, Jeppiaar Trust, Chennai-119
2 Unit III Power plant engineering Gas turbine power plant Gas turbine: Working principle : Air is compressed(squeezed) to high pressure by a fan-like device called the compressor. Then fuel and compressed air are mixed in a combustion chamber and ignited. Hot gases are given off, which spin the turbine wheels. Most of the turbine s power runs the compressor. Part of it drives the generator/machinery. August 16,
3 Unit III Power plant engineering Gas turbine power plant Gas turbine: Description: Gas turbines burn fuels such as oil, nature gas and pulverised(powdered) coal. Instead of using the heat to produce steam, as in steam turbines, gas turbines use the hot gases directly to turn the turbine blades. Gas turbines have three main parts: i) Air compressor ii) Combustion chamber iii) Turbine August 16,
4 Unit III Power plant engineering Gas turbine power plant Gas turbine: Air compressor: The air compressor and turbine are mounted at either end on a common horizontal axle(shaft), with the combustion chamber between them. Gas turbines are not self starting. A starting motor initially drives the compressor till the first combustion of fuel takes place, later, part of the turbine s power runs the compressor. The air compressor sucks in air and compresses it, thereby increasing its pressure. August 16,
5 Unit III Power plant engineering Gas turbine power plant Gas turbine: Combustion chamber: In the combustion chamber, the compressed air combines with fuel and the resulting mixture is burnt. The greater the pressure of air, the better the fuel air mixture burns. Modern gas turbines usually use liquid fuel, but they may also use gaseous fuel, natural gas or gas produced artificially by gasification of a solid fuel. Note : The combination of air compressor and combustion chamber is called as gas generator. August 16,
6 Unit III Power plant engineering Gas turbine power plant Gas turbine: Turbine: o The burning gases expand rapidly and rush into the turbine, where they cause the turbine wheels to rotate. o Hot gases move through a multistage gas turbine. o Like in steam turbine, the gas turbine also has fixed(stationary) and moving(rotor) blades. o The stationary blades guide the moving gases to the rotor blades and adjust its velocity. o The shaft of the turbine is coupled to a generator or machinery to drive it. August 16,
7 Unit III Power plant engineering Gas turbine power plant Applications of gas turbine: Gas turbines are used to drive pumps, compressors and high speed cars. Used in aircraft and ships for their propulsion. They are not suitable for automobiles because of their very high speeds. Power generation(used for peak load and as stand-by unit). Note : Gas turbines run at even higher temperatures than steam turbines, the temperature may be as high as C. The thermal efficiency of gas turbine made of metal components do not exceed 36%. Research is underway to use ceramic components at turbine inlet temperature of C or more, and reach thermal efficiencies over 40% in a 300 kw unit. August 16,
8 Layout of a gas turbine power plant August 16,
9 Layout of gas turbine power plant Starting motor: Gas turbines are not self starting. They require a starting motor to first bring the turbine to the minimum speed called coming in speed, for this purpose a starting motor is required. Low pressure compressor(lpc): The purpose of the compressor is to compress the air. Air from the atmosphere is drawn into the LPC and is compressed. Intercooler: The air after compression in the LPC is hot. It is cooled by the intercooler. The intercooler is circulated with cooling water. August 16,
10 Layout of gas turbine power plant High pressure compressor(hpc): The air from the intercooler enters the HPC where it is further compressed to a high pressure. The compressed air passes through a regenerator. Regenerator(Heat exchanger): The air entering the combustion chamber(cc) for combustion must be hot. The heat from the exhaust gases is picked up by the compressed air entering the combustion chamber. Combustion chamber: The fuel(natural gas, pulverized coal, kerosene or gasoline) is injected into the combustion chamber. The fuel gets ignited because of the compressed air. The fuel along with the compressed air is ignited sometimes with a spark plug. August 16,
11 Layout of gas turbine power plant High pressure compressor(hpc): The air from the intercooler enters the HPC where it is further compressed to a high pressure. The compressed air passes through a regenerator. Regenerator(Heat exchanger): The air entering the combustion chamber(cc) for combustion must be hot. The heat from the exhaust gases is picked up by the compressed air entering the combustion chamber. Combustion chamber: The fuel(natural gas, pulverized coal, kerosene or gasoline) is injected into the combustion chamber. The fuel gets ignited because of the compressed air. The fuel along with the compressed air is ignited sometimes with a spark plug. August 16,
12 Layout of gas turbine power plant High pressure turbine (HPT): In the beginning the starting motor runs the compressor shaft. The hot gases(products of combustion) expands through the high pressure turbine. It is important to note that when the HPT shaft rotates it infact drives the compressor shaft which is coupled to it. Now the HPT runs the compressor and the starting motor is stopped. Note : About 66% of the power developed by the gas turbine power plant is used to run the compressor. Only 34% of the power developed by the plant is used to generate electric power. August 16,
13 Layout of gas turbine power plant Low pressure turbine (LPT): The purpose of the LPT is to produce electric power. The shaft of the LPT is directly coupled with the generator for producing electricity. The hot gases(products of combustion) after leaving the HPT is again sent to a combustion chamber where it further undergoes combustion. The exhaust gases after leaving the LPT passes through the regenerator before being exhausted through the chimney into the atmosphere. The heat from the hot gases is used to preheat the air entering the combustion chamber. This preheating of the air improves the efficiency of the combustion chamber. August 16,
14 Gas turbine power plant Advantages of gas turbine power plant : Storage of fuel requires less area and handling is easy. The cost of maintenance is less. It is simple in construction. There is no need for boiler, condenser and other accessories as in the case of steam power plants. Cheaper fuel such as kerosene, paraffin, benzene and powdered coal can be used which are cheaper than petrol and diesel. Gas turbine plants can be used in water scarcity areas. Less pollution and less water is required. Disadvantages of gas turbine power plant : 66% of the power developed is used to drive the compressor. Therefore the gas turbine unit has a low thermal efficiency. The running speed of gas turbine is in the range of (40,000 to 100,000 rpm) and the operating temperature is as high as C. For this reason special metals and alloys have to be used for the various parts of the turbine. High frequency noise from the compressor is objectionable. August 16,
15 Videos and Animations 1. How a gas turbine engine works 1. Gas turbine working principle 1. 3Gas turbine power plant.swf
16 Thank You August 16,
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