• Rahul Shukla
• Mr. Yogesh Kumar Tembhurne
• Dr.(Prof.) Mohit Gangwar

Energy is fundamental requirement of human life, and thus a driving force of civilization so it must be utilized very efficiency at all levels. There is a great potential for increased efficiency in energy converting devices by recovering waste heat to a greater extent. Since twentieth century the steam turbines became the most important prime mover for electricity generation. But because of their own limitations, the need of compact power plant by utilization combustion products expansion in turbine. Thus the concept of gas turbine came in to existence. It was realized that thermal efficiency of gas turbine was poor as around sixty percent of the total heat generated in combustion chamber goes waste in the exhaust. Hence it was realized that thermal efficiency of gas turbine can be improved if use of waste energy can be made to generate steam. Combined cycle power plants are gaining increasing acceptance as alternative to conventional or nuclear steam cycle due to high thermal efficiency as high as 60% utilizing natural gas as fuel. The performance of combined cycle depends upon the number of parameters like turbine inlet temp., component efficiency, turbine exhaust temp., degree of supplementary heating and condition of steam generation In this technical paper, specific work output and thermal efficiency of combined cycle is determined at different air fuel ratio, pressure ratio and variable supplementary heating. In the present paper the pressure ratio has been taken in the range of 4 to 20 bar, air fuel ratio 50, 55, 60, and 65 and supplementary heating from 0.1 to 0.5. It is observed that specific work output and thermal efficiency improve at lower air fuel ratio, pressure ratio and supplementary heating. In the present analysis effect of supplementary heating on performance of combined cycle is discussed. It was desirable that at the (exhaust temp. of gas turbine t4a + gas turbine by passed temp.t3) should be above 813 K, otherwise the steam cycle would be inefficient resulting in lower combined cycle plant efficiency

A/F Ratio, Pressure ratio, Supplementary Heating, Specific work output, efficiency

"EFFECT OF SUPPLEMENTARY HEATING ON THE PERFORMANCE OF COMBINED CYCLE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 7, page no.1508-1512, July-2018, Available :http://www.jetir.org/papers/JETIRC006259.pdf

"EFFECT OF SUPPLEMENTARY HEATING ON THE PERFORMANCE OF COMBINED CYCLE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 7, page no. pp1508-1512, July-2018, Available at : http://www.jetir.org/papers/JETIRC006259.pdf