Regragui A. Increasing the efficiency of monary gas-steam technologies

The thesis is devoted to the development of the main prositions for increasing the efficiency of monary gas vapor plants by means of their thermodynamic forcing due to an increase in the relative flow rate of water vapor supplied to the gas-steam path of the plant, as well as partial replacement of natural gas with alternative fuels based on the use of dual-fuel schemes. A complex of studies has been carried out for studying of the features of the influence of the water vapor supply level on the characteristics of the monary gas vapor plants. The limiting possibilities of forcing the monarygas-steam technology of the "VODOLEI" cycle are determined, corresponding to the maximum allowable supply of water vapor in to the gas-steam turbine path. New high-efficiency schemes of dual-fuel monary gas vapor plants with a preboiler have been developed, which operate on alternative fuels of low and medium calorific value. The analysis of thermodynamic processes in the furnaces pace and the steam-generating circuit of the preboiler of a dual-fuel monary gas vapor plants is carried out during the operation of its heat recovery circuit in the feedwater heating mode and in its heating and evaporation. The data of thermodynamic modeling of the processes of the specified plant under various operating modes of its heat recovery circuit were obtained and on this basis the technical and economic indicators of this plant were determined in comparison with the " VODOLEI" plant and a simple gas turbine unit. The high efficiency of the new enthalpy-entropy approach to thermodynamic modeling of processes in gas turbine and combined power plants on their basis has been substantiated.