Совершенствование аэродинамических трактов парогазовой установки

Abstract

Рассмотрена возможность увеличения мощности ГТУ за счет совершенствования аэродинамических трактов. Разработан проект и выполнена модернизация тракта окислителя энергоблока ПГУ-250 Молдавской ГРЭС с газовой турбиной ГТ-35, которая показала существенный резерв увеличения мощности за счет снижения противодавления за газовой турбиной, путем корректировки геометрии тракта сброса окислителя от газовой турбины в котел. Совершенствование аэродинамики выполняется физическим моделированием методом визуальной диагностики структуры потоков.Combined cycle plants provide an increase in the efficiency factor of power generating units used by contemporary thermal power plants. Most of the research done to increase the efficiency of gas turbine plants is devoted to an increase in initial parameters and in the first place, the temperature in front of the turbine. This scientific paper gives consideration to an increase in the power of the gas turbine unit behind the turbine due to the improvement of aerodynamic channels. The project was developed and the oxidizer pass of the power unit SGU-250 installed for Moldova hydraulic power station equipped with the gas turbine was updated and that resulted in a considerable power increase reserve due to the reduction of the back pressure behind the gas turbine through the adjustment of the discharge pass of oxidizer from the gas turbine to the boiler. The aerodynamics is improved by the physical simulation using the method of the visual diagnostics of the flow structure. The adjustment of flow aerodynamics provides the flow without separation in the flow passes of the equipment. The test method of the modernization data of the aerodynamic channel was developed using the stopped power unit with actuated forced draft mechanisms. The solution of the problem on decreasing the resistance of the main elements of the aerodynamic channel showed that the compressor output can be increased with a simultaneous increase in the gas turbine power. Making thus no changes in the flow pass parts of compressor elements and turbine elements, by changing only the geometry to reduce pressure losses of input and output GTU elements it is quite feasible to increase the gas turbine power and to improve its power, cost, overall and other characteristics.