Thermal Scheme Development for Combined Cycle Power Plant with High-Pressurized Heat Recovery Steam Generator

Article describes the actuality of High-Pressurized Heat Recovery Steam Generator (HPHRSG) with the gas turbine combined cycle realization for existing steam-power unit reconstruction. It is shown that this is relevant not only because it formally meets the requirements of the energy development program, but also allows reducing of reconstruction costs due to the equipment parts preservation. Proposed layout differences from the existing solutions in this area are given. It was shown that the optimal pressure in HPHRSG is 4–5 bar, and this is associated with the largest incensement in heat transfer coefficient. It is shown that the greatest decrease in metal consumption occurs in the same area. Several calculated modernization schemes for the popular T-100 and K-300 steam turbines with domestic gas turbines GTE-160 and GT-25PA are presented. It is related to incensement of equipment unification degree. Several promising schemes for implementation are proposed.