The paper proposes new circuit solutions for dual-fuel monar gas-steam plants (DMGSP), which provide an increase in the efficiency of electricity production in these plants by replacing the use of natural gas and increasing the share of generating "energy" steam by including an additional source of generation in the technological scheme steam - "preboiler", in which steam generation occurs as a result of the use of chemical energy of low-grade solid or liquid fuels - substitutes for natural gas of low or medium calorific value. DMGSPs are considered in two variants of operation of their utilization circuit: under conditions of heating and evaporation of feeding water, or only heating of this water. The results of calculations of the effectiveness of the implementation of these schemes on the basis of a monar gas turbine plant in comparison with the basic installation "VODOLEY" and a gas turbine plant of a simple scheme are presented.

Доктор технических наук, профессор Н. М. Ф и а л к о Доктор технических наук, профессор, заведующая отделом, заслуженный деятель науки и техники, член-корреспондент НАН Украины*

The basic positions of the enthalpy-entropy methodology of thermodynamic modeling of processes in gas turbine units (GTUs) and combined power plants on basis GTUs are presented. The main requirements and conditions of this methodology are formulated, they allows the construction of a sequential (without iterations) algorithm for the computational diagnostics of the thermodynamic parameters of the GTU cycle, which includes the calculation blocks for the compressor, combustion chamber, turbine, and exhaust tube of the GTU. The obtained regression equations are presented. The use of these equations simplifies of the procedure for evaluating the thermodynamic parameters of the components at the nodal points of the cycle. The advantages of the proposed methodology in comparison with the traditional thermal-entropy methodology are indicated.

The article presents the enthalpy-entropy methodology of thermodynamic analysis of gas turbine and combined power plants on their basis, the results of testing the method on a real technical facility, proving its high efficiency.