Abstract
The urgency of this work is determined by the intensification of the role of steam-gas technologies (combined cycle technologies) in the field of power engineering in Russia and throughout the world. Developed mathematical model of ternary combined cycle plants, which is based on balance method includes system of mass balance and energy balance equations for ternary combined cycle plants and its units, equations of steam expansion in turbine and working fluids thermodynamic properties. On the basis of a model was carried out the analysis of the impact of the structure and thermodynamic parameters on thermal effectiveness of heat-recovery ternary combined cycle plants which cycle is the combination of three working substance cycles, one of which is low-boiling substance. The analysis of the thermal effectiveness of ternary combined cycle plants was made by means of the small-deflection method. The optimal parameters of operating environment and structure of a ternary combined cycle plants were determined.
Highlights
Steam-gas technology which contributes to the considerable effectiveness and environmental safety increase of thermal engineering has actively been implemented in the world power engineering
The achievement of high effectiveness of a ternary CCP by the specified gas turbine plant parameters and characteristics is possible by the optimal values of thermodynamic parameters and the consumption of working substances; they are interconnected and not all of them can be controlled by optimization, for example, the live steam saturation temperature of low-boiling substance and its pressure are determined by steam pressure values in a condenser
The investigations conducted on the basis of this type of plant allow us to make a conclusion, that the choice of the structure and parameters of the working substances of TCCP should be made by taking into account the level of influence of certain plants (GTP, STP, LBS) on the CCP effectiveness
Summary
Steam-gas technology (combined cycle technology) which contributes to the considerable effectiveness and environmental safety increase of thermal engineering has actively been implemented in the world power engineering. The fuel energy in these kinds of combined cycle plants is fed to the working substance in the combustion chamber of GTI only, the heat of the gas burned (flue) in GTI is used in a boiler-utilizer for the generation of superheated steam which is further used in a steam-turbine plant. Two working substances are used in these types of power plants: the mixture of air with fuel and steam combustion products. They considerably surpass the traditional steam-turbine power generating units concerning their thermodynamic effectiveness and ecological parameters. Their coefficient of efficiency can reach 60 %. The object of the given research are ternary combined cycle plants
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