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By generating power from multiple streams of work, the overall efficiency can be increased by 50–60%. That is, from an overall efficiency of the system of say 34% for a simple cycle, to as much as 64% net for the turbine alone in specified conditions for a combined cycle. [ 1 ]
A Combined Cycle Power Plant produces high power outputs at high efficiencies (up to 55%) and with low emissions. In a Conventional power plant we are getting 33% electricity only and remaining 67% as waste .
How well do you understand the operation and efficiency of combined cycle power plant? Expression of Efficiency. In 2016, GE manufactured a combined cycle power plant with an efficiency of 62.22%. This went straight into the Guinness World Records as the most efficient at that time.
The combined cycle efficiency would be 58%, which is a very large increase over either of the two simple cycles. Some representative efficiencies and power outputs for different cycles are shown in Figure 8.20.
A combined-cycle power plant uses both a gas and a steam turbine together to produce up to 50% more electricity from the same fuel than a traditional simple-cycle plant. The waste heat from the gas turbine is routed to the nearby steam turbine, which generates extra power.
Combined cycle power plants are large scale high-efficiency units for the conversion of gas (natural gas or synthetic gas from renewables) into electricity. Since they are installed with large capacity, it is often difficult to make use of the waste heat.
These newer combustion turbines allow combined-cycle power blocks to have larger capacities and improved efficiencies. The average capacity of a 2x1 power block increased from 500 MW for those built before 2015 to over 700 MW for those built after 2015.
Adaptive Neuro-Fuzzy System (ANFIS) is used as an optimization technique. The highest attained power output and thermal efficiency were 1540 MW and 61%, respectively. Turbine inlet temperature is found to be the key parameter for the optimum performance (power and thermal efficiency).
The overall efficiency of an offshore CCGT is approximately 50%. An onshore CCGT has increased efficiency due to additional pressure levels and reheat circuits, and it has an overall efficiency of approximately 60%. The efficiency drops significantly at partial load.
To put this into perspective, the efficiency of conventional thermal power plants, in contrast, is about 35-40%. This makes CCPPs a preferred choice for power generation, reducing fuel consumption and emissions—a huge plus considering today's focus on energy efficiency and sustainability.