Integrated Mathematical Model of the Processes in the Turbine with Adjustable Steam Extraction
DOI:
https://doi.org/10.20998/2078-774X.2016.08.04Анотація
This article is dedicated to improving and expanding the ability of mathematical model of processes in the steam turbines flow path with the aim of implementation of integrated thermal steam turbines computation with controlled steam extractions. The mathematical model is based on a complex system of equations. Solving these equations, you can perform the calculation of the turbine, which consists of steam distribution system, control stage and the rest of the turbine with plenty of pressure stages. This is achieved by increasing the dimension of the common system of equations. In the number of unknown parameters of the overall system of equations the velocity coefficients of all nozzle grids, that have rotary diaphragm, are added. This system of equations is solving numerically using the Fletcher-Reeves conjugate gradient method. Thanks to the empowerment of the mathematical model of steam turbine flow path processes it is possible to solve the computation problem of the turbine for heating system in new statement: "at a specified pressure in the camera of steam extraction and steam consumption for heating system”. The results of the computation studies of the cogeneration turbine APT-12-1, with different combinations of pressure and the mass flow rate of the extracted steam for heating are given in the article. The results of the studies confirmed the correctness of the improvements made in the mathematical model. Improved mathematical model can be used for solving the problems of the analysis of the efficiency of steam turbines and the problems of synthesis of optimal flow paths of extraction turbines taking into account their modes of operation.Посилання
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