Abstract
Now a day’s power generation is most important for every country. This power is generated by some thermal cycles. But single cycle cannot be attain complete power requirements and its efficiency also very low so that to fulfill this requirements to combine two or more cycles in a single power plant then we can increase the efficiency of the power plant. Its increased efficiency is more than that of if the plant operated on single cycle. In which we are using two different cycles and these two cycles are operated by means of different working mediums. These type of power plants we can called them like combined cycle power plants. In combined cycle power plants above cycle is known as topping cycle and below cycle is known as bottoming cycle. The above cycle generally brayton cycle which uses air as a working medium. When the power generation was completed the exhaust gas will passes in to the waste heat recovery boiler. Another cycle also involved in bottoming cycle. This cycle works on the basis on rankine cycle. In which steam is used as working medium. The main component in bottoming cycle is waste heat recovery boiler. It will receive exhaust heat from the gas turbine and converts water in to steam. The steam used for generating power by expansion on steam turbine. Combined cycle power plants are mostly used in commercial power plants.In this paper we are analyzing one practical combined cycle power plant. In practical conditions due to some losses it can not be generates complete power. So that we are invistigated why it is not give that much of power and the effect of various operating parameters such as maximum temperature and pressure of rankine cycle, gas turbine inlet temperature and pressure ratio of Brayton cycle on the net output work and thermal efficiency of the combine cycle power plant.The outcome of this work can be utilized in order to facilitate the design of a combined cycle with higher efficiency and output work. Mathematical calculations and simple graphs in ms excel, and auto cad has been carried out to study the effects and influences of the above mentioned parameters on the efficiency and work output.
Highlights
Combined cycle power plants used for generate electricity and cogeneration
Combined cycle efficiency can increase by number of ways.(i) decreasing the inlet temperature so that the gas turbine efficiency of combined cycle gas turbine increases (ii) increasing the compression ratio combined cycle power plant efficiency will increases (iii) increasing the combustion temperature in combustion chamber so that plant efficiency increases (iv) increasing the boiler temperature and pressure combined cycle power plant efficiency increases (v) decreasing the condenser pressure in Rankine cycle efficiency increases
Alhazmy and Najjar [4] in their paper they provided an information about different power generation cycles i.e.., Brayton cycle, Rankine cycle, and combined cycles, and its practical applications and they discussed the effect on combined cycle efficiency by changing the parameters like heat supplied to the gas turbine, feed water heater temperature, and boiler pressure and temperature of the boiler and provided an information for introduction to combined cycle power plants and gave detailed information of different combined cycle power plants that are already operated in different countries
Summary
Combined cycle power plants used for generate electricity and cogeneration. Generally combined cycles are made up of two cycles. Alhazmy and Najjar [4] in their paper they provided an information about different power generation cycles i.e.., Brayton cycle, Rankine cycle, and combined cycles, and its practical applications and they discussed the effect on combined cycle efficiency by changing the parameters like heat supplied to the gas turbine, feed water heater temperature, and boiler pressure and temperature of the boiler and provided an information for introduction to combined cycle power plants and gave detailed information of different combined cycle power plants that are already operated in different countries. These equipments will consume part of the work from the total power generated They gave information how to reduce the power consumption of auxiliary equipment and provide different methods to improve the efficiency of the plant. Thamir et al [11] in their paper provided information about in topping cycle of the combined gas turbine power plant They said that perfect air inlet temperature in compressor; perfect air fuel ratio in combustion chamber and maintaining sufficient pressure ratio the efficiency of the entire plant will increase. In every condition the work output and efficiencies are increased
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