Theoretical bases of the methods of modernization the cylinders of heating steam turbines

Abstract

The theoretical foundations of the methodology for designing and upgrading the technological schemes of the thermal steam turbines are described in the nominal operating mode, based on the theoretical temperature schedule of the heating systems and the associated loads of consumers. As a basic method of numerical optimization of the parameters of the turbine stage, the minimization method of the comparison function (MCF-method) is used, based on the search for minimum points for a multidimensional functional reflecting the relationship between the theoretical and experimental values of technical characteristics processes of the working substance (steam) moving through the elements of the stage. The construction of the mathematical model of the investigated processes is carried out on the basis of one-dimensional and two-dimensional nonlinear equations of the hydrodynamic flow and heat equations, taking into account losses at various increments at different parts of the process flow diagram. As the object of investigation adopted Heat Steam turbine model T-110-120-130 LMF operating at nominal parameters (110 MW) in a station «Karagandinskaya TPS-3». Subject of modernization consists in replacing the group of stages of rotor blades and MPC, LPC on the blades saber shape. According to the results of detailed numerical calculations, the reconstruction stages MPC provides the estimated increase thermal power turbine 10–12 Gcal/h, the entire station 90–120 Gcal/h, which has certain practical importance in the development of technological renovation plans TPS circuits. On blades saber shape model theoretically established nonlinear hydrodynamic effects, manifested in the form of a nonlinear function calculated relative stage efficiency of the internal steam pressure in the upper heating selection.