Abstract
The cogeneration combined-cycle gas turbine plant with back-pressure steam turbine is considered. A simple circuit of the plant increases its reliability, and the use of optimal temperatures of the heating and return water allows obtaining the highest thermal efficiency of the plant taking into account the ratio of its electric and heat power. The technical and economic efficiency of the combined-cycle plant with back-pressure steam turbine is studied to estimate the capital investment. The parameters and conditions to maximize the net present value growth relative to the base version are determined.
Highlights
Combined-cycle technologies have occupied a leading position in heat power engineering due to high heat efficiency and environmental friendliness
The exhaust heat of gas turbine (GT) is recovered in a heat recovery steam generator (HRSG) for generation of superheated steam, which flows to the steam bottoming cycle
2 cycle gas turbine (CCGT) with a back-pressure steam turbine In CCGT-BP, the exhaust GT gas heat is recovered in HRSG in two sections of the heating cycle: upon supply of the superheated steam and during heating the return water in the HRSG back-end surfaces
Summary
Combined-cycle technologies have occupied a leading position in heat power engineering due to high heat efficiency and environmental friendliness. In the most efficient binary-cycle CCPP with bottoming cycle and is called a combined cycle gas turbine (CCGT) plant. The exhaust heat of gas turbine (GT) is recovered in a heat recovery steam generator (HRSG) for generation of superheated steam, which flows to the steam bottoming cycle. The efficiency of these CCGTs based on high-temperature GT reaches 60% and higher [2,3]. Higher levels of heat efficiency are obtained in cogeneration combined-cycle plants supplied with different cycles and circuits. One of the versions of this plant is CCGT with a back-pressure steam turbine (CCGT-BP) [4]
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