5: The effect of increasing the boiler pressure on the ideal Rankine cycle. Increasing the operating pressure of the boiler leads to an increase in the temperature at which heat is transferred to the steam and thus raises the efficiency of the cycle.
What are the methods used to increase the efficiency of the steam cycle?
As we have discussed earlier that we can increase the thermal efficiency of the steam power cycle by increasing the mean temperature of heat energy addition. Mean temperature of heat energy addition could be increased by increasing the temperature of the steam by heating the working fluid to a high degree of superheat.
What contributes to the improvement of efficiency of Rankine cycle in a thermal power plant?
6. Which of the following contributes to the improvement of efficiency of Rankine cycle in a Thermal Power Plant? … Explanation: Working fluid in Rankine cycle undergoes 4 processes, expansion in turbine, heat addition in Boiler, heat rejection in Condenser and compression in pump.
How can we increase the efficiency of a thermal power plant?
At present, the most popular approaches to improve the total efficiency of a steam turbine include increasing the initial steam parameters, decreasing final steam parameters, installing a feed-water heater, and applying combined-cycle technology.
What is the efficiency of Rankine cycle?
In modern nuclear power plants, which operate the Rankine cycle, the overall thermal efficiency is about one-third (33%), so 3000 MWth of thermal power from the fission reaction is needed to generate 1000 MWe of electrical power.
How do you increase the efficiency of a condenser?
Reducing cooling water temperatures is a sure-fire way to improve condenser performance: A decrease in cooling water temperature of 10 degrees F can improve the overall heat rate of a power plant by 1%.
What is Rankine efficiency?
The efficiency of the Rankine cycle
In a Rankine cycle steam from a turbine is condensed completely to liquid – and the liquid can be compressed to boiler pressure with a relatively small feed pump. The efficiency of the Rankine cycle can be expressed as. μR = Hi – He / Hi – hc (1)
Which method will give highest improvement in thermal efficiency of gas turbine plant?
1) Regeneration – This is done by preheating the compressed air before entering to the combustion chamber with the turbine exhaust in a heat exchanger, thus saving fuel consumption. 2) Reheating : The whole expansion in the turbine is achieved in two or more stages & reheating is done after each stage.
What is the basic principle of regeneration?
What is the basic principle of regeneration? Explanation: In regeneration steam from condenser is circulated through turbine to increase steam temperature before it enters boiler. Explanation: Feedwater is preheated so as to decrease the fuel consumption which increases efficiency.
Which power plant has maximum efficiency?
Today we announced that the Chubu Electric Nishi-Nagoya power plant Block-1 – powered by GE’s 7HA gas turbine – has been recognized by GUINNESS WORLD RECORDS™ as the world’s Most efficient combined-cycle power plant, based on achieving 63.08 percent gross efficiency.
Which power plant has highest thermal efficiency?
Persistence and diligence pays and as a result of a lot of good engineering and hard work, the Longview plant reached the pinnacle of top efficiencies in the U.S., achieving a Heat-Rate of 8,999 Btu’s per kWh. This is an overall thermal efficiency of 38%.