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The Characteristics Research for CCGT Modernization Scheme with Pressurized Heat Recovery Steam Generator

This article describes the studies’ results aimed at the gas turbine combined cycle (CCGT) with the pressurized heat recovery steam generator (PHRSG) modernization scheme for the existing steam-power unit. It is shown that this scheme meets the energy development program's formal requirements. It reduces the reconstruction costs due to the equipment parts preservation. The heat transfer study has shown the possibility of heat exchange process simulation with boiler designer software. It was shown that the optimal flue gas pressure in PHRSG is 4–5 bar. Raising the flue gas pressure up to this level gives the largest increase in heat transfer coefficient. The greatest decrease in metal consumption occurs in the same area. The inlet velocity range from 10 to 20 m/s is optimal in this scheme. Several modernization schemes for popular Russian T-100 and K-300 steam turbines and GTE-160 and GT-25PA gas turbines are presented. The promising equipment unification potential of these schemes is shown. Several challenging schemes based on the researched scheme are proposed.