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Performance and efficiency of combined cycle power plant.

Number: 2102

Author(s) : MOMIN ELHADI A., SIDDHARTH P., AYA MOHAMMED HASSAN M.

Summary

In this study, the authors conducted rigorous energetic analysis for combined cycle gas turbine (CCGT) power plant in Khartoum North Station, Sudan, with similar plant data sets. The energy and performance efficiency of each component and overall plant is initiated by detailed mass and energy balances of the combined Gas and Steam power cycles. The gas turbine unit supplied exhaust temperature of over 600°C which passes through a heat recovery steam generator (HRSG) to produce steam at three different pressure levels. According to the sets of data used, the total power and net energy efficiency of the plant is predicted at 287MW and 62.57% respectively. The analysis revealed that the increase in ambient temperature leads to an increase in the demand of the steam by steam turbine plant at different levels of air humidifier water cooling flow rate, sharply decreasing the amount of steam quantity, saving water in the plant, reducing losses, and thus improving the CCGT power and efficiency. The increase in compression ratio lead to a decrease in the amount of steam at the steam turbine plant. The sharp reduction of steam quantity indicated that the ambient temperature conditions were 40.2% higher and 41.86%lower respectively. The CCGT efficiency exhibited gradual increase with an increasing steam turbine inlet temperature which reached maximum values at high compression ratio. It resulted that, the increase of inlet air humidifier water cooling mass flow rate led to a sharp decrease in the quantity of fuel required in the combustion chamber at specified compression ratio. The results reveal that the combustor fuel flow rate is higher for the lower range of compression ratio. The extensive modeling suggests a sharp increase in combustor fuel flow rate by 21.79% and 21.60% for higher and lower compressor inlet temperature respectively. The increase in the amount of steam verified at specified compression ratio resulted in gradually increasing the power of steam turbine unit thus effecting the gross power of the CCGT power plant.

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  • Original title: Performance and efficiency of combined cycle power plant.
  • Record ID : 30030465
  • Languages: English
  • Subject: Technology, Developing country
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022/07/10

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